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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal period Focus	Q3
Trading Symbol	JAZZ
Entity Registrant Name	Jazz Pharmaceuticals plc
Entity Central Index Key	0001232524
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Entity Common Stock, Shares Outstanding (in shares)		60,321,590

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 499,018	$ 386,035
Investments	565,000	215,000
Accounts receivable, net of allowances	279,437	224,129
Inventories	43,435	43,245
Prepaid expenses	23,189	23,182
Other current assets	54,310	76,686
Total current assets	1,464,389	968,277
Property, plant and equipment, net	198,053	170,080
Intangible assets, net	2,787,281	2,979,127
Goodwill	932,422	947,537
Deferred tax assets, net	37,582	34,559
Deferred financing costs	10,058	7,673
Other non-current assets	56,003	16,419
Total assets	5,485,788	5,123,672
Current liabilities:
Accounts payable	37,373	24,368
Accrued liabilities	257,453	198,779
Current portion of long-term debt	33,387	40,605
Income taxes payable	7,139	21,577
Deferred revenue	5,935	8,618
Total current liabilities	341,287	293,947
Deferred revenue, non-current	10,934	16,115
Long-term debt, less current portion	1,560,582	1,540,433
Deferred tax liabilities, net	337,021	383,472
Other non-current liabilities	208,647	176,608
Commitments and contingencies (Note 10)
Shareholders’ equity:
Ordinary shares	6	6
Non-voting euro deferred shares	55	55
Capital redemption reserve	472	472
Additional paid-in capital	2,078,032	1,935,486
Accumulated other comprehensive loss	(179,466)	(140,878)
Retained earnings	1,128,218	917,956
Total shareholders’ equity	3,027,317	2,713,097
Total liabilities and shareholders’ equity	$ 5,485,788	$ 5,123,672

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 469,373	$ 411,855	$ 1,414,465	$ 1,182,294
Operating expenses:
Cost of product sales (excluding amortization of intangible assets)	26,574	31,203	95,207	84,940
Selling, general and administrative	155,873	124,523	521,665	401,106
Research and development	51,160	47,362	169,959	132,447
Intangible asset amortization	46,989	47,313	154,955	99,164
Impairment charges	0	0	42,896	0
Acquired in-process research and development	0	75,000	0	77,000
Total operating expenses	280,596	325,401	984,682	794,657
Income from operations	188,777	86,454	429,783	387,637
Interest expense, net	(18,920)	(19,192)	(59,171)	(56,330)
Foreign exchange loss	(756)	(2,224)	(5,181)	(9,115)
Loss on extinguishment and modification of debt	0	0	(1,425)	0
Income before income tax provision and equity in loss of investees	169,101	65,038	364,006	322,192
Income tax provision	19,348	1,239	75,018	65,914
Equity in loss of investees	437	273	1,360	637
Net income	$ 149,316	$ 63,526	$ 287,628	$ 255,641
Net income per ordinary share:
Basic (in dollars per share)	$ 2.47	$ 1.06	$ 4.78	$ 4.26
Diluted (in dollars per share)	$ 2.41	$ 1.03	$ 4.68	$ 4.17
Weighted-average ordinary shares used in per share calculations - basic (in shares)	60,476	60,108	60,196	60,030
Weighted-average ordinary shares used in per share calculations - diluted (in shares)	61,857	61,436	61,493	61,360
Product sales, net
Revenues:
Total revenues	$ 465,197	$ 407,971	$ 1,402,139	$ 1,171,304
Royalties and contract revenues
Revenues:
Total revenues	$ 4,176	$ 3,884	$ 12,326	$ 10,990

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 149,316	$ 63,526	$ 287,628	$ 255,641
Other comprehensive income (loss):
Foreign currency translation adjustments	(11,984)	50,870	(43,945)	159,302
Unrealized gain (loss) on hedging activities, net of tax expense (benefit) of $107, $56, $758 and ($137), respectively	746	392	5,304	(956)
Other comprehensive income (loss)	(11,238)	51,262	(38,641)	158,346
Total comprehensive income	$ 138,078	$ 114,788	$ 248,987	$ 413,987

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Tax effect on hedging activities	$ 107	$ 56	$ 758	$ (137)

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 287,628	$ 255,641
Adjustments to reconcile net income to net cash provided by operating activities:
Intangible asset amortization	154,955	99,164
Share-based compensation	75,718	79,579
Impairment charges	42,896	0
Depreciation	11,363	9,288
Acquired in-process research and development	0	77,000
Loss on disposal of assets	652	360
Deferred income taxes	(44,658)	(53,359)
Provision for losses on accounts receivable and inventory	4,734	1,825
Loss on extinguishment and modification of debt	1,425	0
Amortization of debt discount and deferred financing costs	32,669	19,234
Other non-cash transactions	6,970	14,480
Changes in assets and liabilities:
Accounts receivable	(55,518)	(22,273)
Inventories	(7,583)	(7,132)
Prepaid expenses and other current assets	6,989	(10,590)
Other long-term assets	(6,494)	(1,825)
Accounts payable	10,116	6,130
Accrued liabilities	65,074	(23,583)
Income taxes payable	(13,999)	8,495
Deferred revenue	(5,623)	23,163
Other non-current liabilities	7,244	12,931
Net cash provided by operating activities	574,558	488,528
Investing activities
Proceeds from maturity of investments	565,000	150,000
Net proceeds from sale of assets	48,092	0
Acquired in-process research and development	0	(77,000)
Purchases of property, plant and equipment	(15,221)	(20,072)
Acquisition of intangible assets	(111,100)	0
Acquisition of investments	(915,000)	(290,000)
Net cash used in investing activities	(428,229)	(237,072)
Financing activities
Proceeds from employee equity incentive and purchase plans	84,056	22,793
Proceeds from tenant improvement allowance on build-to-suit lease	1,253	0
Net proceeds from issuance of debt	0	559,484
Repayments under revolving credit facility	0	(850,000)
Payment of debt modification costs	(6,406)	0
Payment of employee withholding taxes related to share-based awards	(17,192)	(17,909)
Repayments of long-term debt	(17,370)	(27,070)
Share repurchases	(77,015)	(56,425)
Net cash used in financing activities	(32,674)	(369,127)
Effect of exchange rates on cash and cash equivalents	(672)	4,323
Net increase (decrease) in cash and cash equivalents	112,983	(113,348)
Cash and cash equivalents, at beginning of period	386,035	365,963
Cash and cash equivalents, at end of period	$ 499,018	$ 252,615

The Company and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

The Company and Summary of Significant Accounting Policies

Jazz Pharmaceuticals plc is an international biopharmaceutical company focused on improving patients’ lives by identifying, developing and commercializing meaningful products that address unmet medical needs.

We have a diverse portfolio of products and product candidates, with a focus in the areas of sleep and hematology/oncology. Our lead marketed products are:


•	Xyrem^® (sodium oxybate) oral solution, the only product approved by the U.S. Food and Drug Administration, or FDA, and marketed in the U.S. for the treatment of both cataplexy and excessive daytime sleepiness in patients with narcolepsy;


•	Erwinaze^® (asparaginase Erwinia chrysanthemi), a treatment approved in the U.S. and in certain markets in Europe (where it is marketed as Erwinase^®) for patients with acute lymphoblastic leukemia who have developed hypersensitivity to E. coli-derived asparaginase;

•

Defitelio^®(defibrotide sodium), a product approved in the U.S. for the treatment of adult and pediatric patients with hepatic veno-occlusive disease, or VOD, also known as sinusoidal obstruction syndrome with renal or pulmonary dysfunction following hematopoietic stem cell transplantation, or HSCT, and in Europe (where it is marketed as Defitelio^®(defibrotide)) for the treatment of severe VOD in adults and children undergoing HSCT therapy; and


•	Vyxeos^®(daunorubicin and cytarabine) liposome for injection, a product approved in the U.S. and in Europe (where it is marketed as Vyxeos^® 44 mg/100 mg powder for concentrate for solution for infusion) for the treatment of adults with newly-diagnosed therapy-related acute myeloid leukemia or acute myeloid leukemia with myelodysplasia-related changes.

Our strategy is to create shareholder value by:


•	Growing sales of the existing products in our portfolio, including by identifying and investing in growth opportunities such as new treatment indications and new geographic markets;


•	Acquiring or licensing rights to clinically meaningful and differentiated products on the market or product candidates at various stages of development; and


•	Pursuing targeted development of post-discovery differentiated product candidates.

We apply a disciplined approach to allocating our resources between investments in our current commercial and development portfolio and acquisitions or in-licensing of new assets.

Throughout this report, unless otherwise indicated or the context otherwise requires, all references to “Jazz Pharmaceuticals,” “the registrant,” “we,” “us,” and “our” refer to Jazz Pharmaceuticals plc and its consolidated subsidiaries. Throughout this report, all references to “ordinary shares” refer to Jazz Pharmaceuticals plc’s ordinary shares.

Basis of Presentation

These unaudited condensed consolidated financial statements have been prepared following the requirements of the U.S. Securities and Exchange Commission, or SEC, for interim reporting. As permitted under those rules, certain footnotes and other financial information that are normally required by U.S. generally accepted accounting principles, or U.S. GAAP, can be condensed or omitted. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with our annual consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2017.

In the opinion of management, these condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and include all adjustments, consisting only of normal recurring adjustments, considered necessary for the fair presentation of our financial position and operating results. The results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018, for any other interim period or for any future period.

Except for the revenue recognition accounting policy that was updated as a result of adopting Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers”, or ASU No. 2014-09, our significant accounting policies have not changed substantially from those previously described in our Annual Report on Form 10-K for the year ended December 31, 2017.

These condensed consolidated financial statements include the accounts of Jazz Pharmaceuticals plc and our subsidiaries, and intercompany transactions and balances have been eliminated.

Our operating segment is reported in a manner consistent with the internal reporting provided to the chief operating decision maker, or CODM. Our CODM has been identified as our chief executive officer. We have determined that we operate in one business segment, which is the identification, development and commercialization of meaningful pharmaceutical products that address unmet medical needs.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures in the condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on assumptions believed to be reasonable under the circumstances. Actual results could differ materially from those estimates.

Adoption of New Accounting Standards

In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-09. The standard states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this, an entity will need to identify the contract with a customer; identify the separate performance obligations in the contract; determine the transaction price; allocate the transaction price to the separate performance obligations in the contract; and recognize revenue when (or as) the entity satisfies each performance obligation. We adopted ASU No. 2014-09 on January 1, 2018 on a modified retrospective basis. The adoption of ASU No. 2014-09 did not have a material impact on our results of operations and financial position as the timing of revenue recognition for product sales, net, which is our primary revenue stream, did not change. Refer to Note 13, Revenues, for revenue-related disclosures.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments” which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. We adopted this standard on January 1, 2018 and adoption did not have a material impact on our consolidated financial statements.

In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory” which requires an entity to recognize the income tax consequences of an intra-entity asset transfer, other than an intra-entity asset transfer of inventory, when the transfer occurs. We adopted this standard on January 1, 2018 on a modified retrospective basis and adoption did not have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” which provides clarification on the definition of a business and adds guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. We adopted this standard on January 1, 2018. In the second quarter of 2018, we entered into an asset purchase agreement, or APA, with TerSera Therapeutics LLC, or TerSera, whereby TerSera agreed to purchase substantially all of our assets related to the manufacture, marketing and sale of Prialt^®(ziconotide) intrathecal infusion. We entered into an amendment to the APA, and the transaction closed on September 27, 2018. We determined that the disposal group did not constitute a business under the new guidance. Refer to Note 2, Disposition, for further information on the sale of our rights to Prialt.

In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities”, or ASU No. 2017-12. ASU No. 2017-12 amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in their financial statements. ASU No. 2017-12 is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to early adopt this standard on January 1, 2018 on a modified retrospective basis. Adoption of this standard did not have a material impact on our consolidated financial statements.

The cumulative effect of the changes made to our consolidated balance sheet as of January 1, 2018 for the adoption of the above accounting standards was as follows (in thousands):



	Balance at December 31, 2017			Transition Adjustments			Balance at January 1, 2018
Assets:
Deferred tax assets, net	$	34,559		$	595		$	35,154
Liabilities:
Deferred revenue	8,618			(1,120		)	7,498
Deferred revenue, non-current	16,115			(1,120		)	14,995
Deferred tax liabilities, net	383,472			3,133			386,605
Shareholders' Equity:
Accumulated other comprehensive loss	(140,878		)	53			(140,825		)
Retained earnings	917,956			(351		)	917,605

Revenue Recognition

Our revenue comprises product sales, net and royalty and contract revenues. Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Prior to recognizing revenue, we make estimates of the transaction price, including variable consideration that is subject to a constraint. Amounts of variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved.

Product Sales, Net

Product sales revenue is recognized when control has transferred to the customer, which occurs at a point in time, which is typically on delivery to the customer or, in the case of products that are subject to consignment agreements, when the customer removes product from our consigned inventory location for shipment directly to a patient.

Reserves for Variable Consideration

Revenues from sales of products are recorded at the net sales price, which includes estimates of variable consideration for which reserves are established and which relate to returns, specialty distributor fees, wholesaler fees, prompt payment discounts, government rebates, government chargebacks, coupon programs and rebates under managed care plans. Calculating certain of these reserves involves estimates and judgments and we determine their expected value based on sales or invoice data, contractual terms, historical utilization rates, new information regarding changes in these programs’ regulations and guidelines that would impact the amount of the actual rebates, our expectations regarding future utilization rates for these programs and channel inventory data. These reserves reflect our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration that is included in the transaction price may be constrained, and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. We reassess our reserves for variable consideration at each reporting date. Historically, adjustments to estimates for these reserves have not been material.

Reserves for returns, specialty distributor fees, wholesaler fees, government rebates, coupon programs and rebates under managed care plans are included within current liabilities in our condensed consolidated balance sheets. Reserves for government chargebacks and prompt payment discounts are shown as a reduction in accounts receivable.

Royalties and Contract Revenues

We enter into out-licensing agreements under which we license certain rights to our products or product candidates to third parties. If a licensing arrangement includes multiple goods or services, we consider whether the license is distinct. If the license to our intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, we recognize revenue from non-refundable, upfront fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. If the license to our intellectual property is determined not to be distinct, it is combined with other goods or services into a combined performance obligation. We consider whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. We evaluate the measure of progress each reporting date and, if necessary, adjust the measure of performance and related revenue recognition.

At the inception of each arrangement that includes development milestone payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within our control or that of the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is allocated to each performance obligation on a relative stand-alone selling price basis, for which we recognize revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, we re-evaluate the probability of achievement of such development milestones and any related constraint, and if necessary, adjust our estimate of the overall transaction price.

For arrangements that include sales-based royalties and milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties and sales-based milestones relate, we recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty or sales-based milestone has been allocated has been satisfied (or partially satisfied).

Significant Risks and Uncertainties

Our financial results are significantly influenced by sales of Xyrem. Our ability to maintain or increase Xyrem product sales is subject to a number of risks and uncertainties, including, without limitation, the potential U.S. introduction of a generic version of Xyrem before the entry dates specified in our settlements with the abbreviated new drug application, or ANDA, filers, or on terms that are different from those contemplated by the settlement agreements; the potential U.S. introduction of new products that compete with, or otherwise disrupt the market for, Xyrem in the treatment of cataplexy and/or excessive daytime sleepiness in narcolepsy; changes to or uncertainties around regulatory restrictions, including, among other things, changes to our Xyrem risk evaluation and mitigation strategy, or REMS; any increase in pricing pressure from, changes in policies by, or restrictions on reimbursement imposed by, third party payors; changes in healthcare laws and policy, including changes in requirements for patient assistance programs, rebates, reimbursement and coverage by federal healthcare programs, and changes resulting from increased scrutiny on pharmaceutical pricing and REMS programs by government entities; operational disruptions at the Xyrem central pharmacy or any failure to comply with our REMS obligations to the satisfaction of the FDA; and continued acceptance of Xyrem by physicians and patients.

In addition to risks related specifically to Xyrem, we are subject to other challenges and risks specific to our business and our ability to execute on our strategy, as well as risks and uncertainties common to companies in the pharmaceutical industry with development and commercial operations, including, without limitation, risks and uncertainties associated with: effectively commercializing our other products and product candidates; pharmaceutical product development and the inherent uncertainty of clinical success; the regulatory approval process; the challenges of protecting and enhancing our intellectual property rights; our dependence on sole source suppliers for most of our products, including delays or problems in the supply or manufacture of our products and product candidates; competition; complying with applicable regulatory requirements; changes in healthcare laws and policy and related reforms; government investigations and other actions; obtaining and maintaining appropriate pricing and reimbursement for our products; business combination or product or product candidate acquisition transactions; and possible restrictions on our ability and flexibility to pursue certain future opportunities as a result of our substantial outstanding debt obligations.

Concentrations of Risk

Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, investments and derivative contracts. Our investment policy permits investments in U.S. federal government and federal agency securities, corporate bonds or commercial paper issued by U.S. corporations, money market instruments, certain qualifying money market mutual funds, certain repurchase agreements, and tax-exempt obligations of U.S. states, agencies and municipalities and places restrictions on credit ratings, maturities, and concentration by type and issuer. We are exposed to credit risk in the event of a default by the financial institutions holding our cash, cash equivalents and investments to the extent recorded on the balance sheet.

We manage our foreign currency transaction risk and interest rate risk within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes. As of September 30, 2018, we had foreign exchange forward contracts with notional amounts totaling $210.1 million. As of September 30, 2018, the net liability fair value of outstanding foreign exchange forward contracts was $1.0 million. As of September 30, 2018, we had interest rate swap contracts with notional amounts totaling $300.0 million. These outstanding interest rate swap contracts had a fair value of $7.8 million as of September 30, 2018. The counterparties to these contracts are large multinational commercial banks, and we believe the risk of nonperformance is not significant.

We are also subject to credit risk from our accounts receivable related to our product sales. We monitor our exposure within accounts receivable and record a reserve against uncollectible accounts receivable as necessary. We extend credit to pharmaceutical wholesale distributors and specialty pharmaceutical distribution companies, primarily in the U.S., and to other international distributors and hospitals. Customer creditworthiness is monitored and collateral is not required. We monitor deteriorating economic conditions in certain European countries which may result in variability of the timing of cash receipts and an increase in the average length of time that it takes to collect accounts receivable outstanding. Historically, we have not experienced significant credit losses on our accounts receivable and as of September 30, 2018 and December 31, 2017, allowances on receivables were not material. As of September 30, 2018, two customers accounted for 91% of gross accounts receivable, including Express Scripts Specialty Distribution Services, Inc. and its affiliates, or Express Scripts, which accounted for 77% of gross accounts receivable, and McKesson Corporation and affiliates, or McKesson, which accounted for 14% of gross accounts receivable. As of December 31, 2017, two customers accounted for 86% of gross accounts receivable including Express Scripts, which accounted for 71% of gross accounts receivable, and McKesson, which accounted for 15% of gross accounts receivable.

We depend on single source suppliers for most of our products, product candidates and their active pharmaceutical ingredients, or APIs. With respect to Xyrem, the API is manufactured for us by a single source supplier and the finished product is manufactured both by us in our facility in Athlone, Ireland and by our U.S.-based Xyrem supplier.

Recent Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract”, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard is effective for us beginning January 1, 2020 and early adoption is permitted. The new guidance is not expected to have a material impact on our results of operations and financial position.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” which simplifies the accounting for goodwill impairment by eliminating Step 2 of the current goodwill impairment test. Goodwill impairment will now be the amount by which the reporting unit’s carrying value exceeds its fair value, limited to the carrying value of the goodwill. The standard is effective for us beginning January 1, 2020. Early adoption is permitted for any impairment tests performed after January 1, 2017. The new guidance is not expected to have a material impact on our results of operations and financial position.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”, or ASU No. 2016-02. Under the new guidance, lessees will be required to recognize a right-of-use asset, which represents the lessee’s right to use, or control the use of, a specified asset for the lease term, and a corresponding lease liability, which represents the lessee’s obligation to make lease payments under a lease, measured on a discounted basis. ASU No. 2016-02 is effective beginning January 1, 2019 and early adoption is permitted. ASU No. 2016-02 must be adopted on a modified retrospective transition basis at the beginning of the earliest comparative period presented in the consolidated financial statements or at the adoption date. The adoption of ASU No. 2016-02 will result in a significant increase in our consolidated balance sheet for right-of-use assets and lease liabilities. While we are continuing to assess all potential impacts of the standard, we currently believe the most significant impact relates to our accounting for the lease agreements we entered into in January 2015 and September 2017 to lease office space located in Palo Alto, California in buildings constructed or to be constructed by the landlord, which are accounted for as build-to-suit arrangements under existing accounting standards, and the lease agreement we entered into in August 2016 for office space in Dublin, Ireland. The future minimum lease payments under these leases at September 30, 2018 were $208.6 million. Based on our initial evaluation of the impact of ASU No. 2016-02 on our build-to-suit facility leases, we expect to de-recognize existing build-to-suit assets and liabilities upon the adoption of ASU No. 2016-02.

Disposition	9 Months Ended
Disposition	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Disposition	Disposition On June 29, 2018, we entered into an APA with TerSera, pursuant to which TerSera agreed to purchase substantially all of our assets related to the manufacture, marketing and sale of Prialt, but excluding accounts receivable, and to assume certain related liabilities as set forth in the APA. We entered into an amendment to the APA, and the transaction closed, on September 27, 2018. The total sales price was $80.0 million, of which we received $50.0 million at closing, and, subject to certain conditions, we are entitled to receive $15.0 million payable on December 31, 2019 and $15.0 million payable on December 31, 2020, or earlier under certain circumstances. The related assets met the assets held for sale criteria and were reclassified to assets held for sale as of June 30, 2018. We adjusted the carrying value of the assets held for sale to fair value less costs to sell, which resulted in an impairment charge of $42.9 million in our condensed consolidated statements of income for the nine months ended September 30, 2018, primarily related to the carrying balances of intangible assets. Upon closing, we recognized a loss on disposal of $0.5 million within selling, general and administrative expenses in our consolidated statements of income for the three and nine months ended September 30, 2018. We determined that the disposal of these assets does not qualify for reporting as a discontinued operation since it does not represent a strategic shift that has or will have a major effect on our operations and financial results.

Cash and Available-for-Sale Securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Cash and Available-for-Sale Securities

Cash, cash equivalents and investments consisted of the following (in thousands):



	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Cash and Cash Equivalents		Investments
Cash	$	281,047	$	—	$	—	$	281,047	$	281,047	$	—
Time deposits	590,000		—		—		590,000		25,000		565,000
Money market funds	192,971		—		—		192,971		192,971		—
Totals	$	1,064,018	$	—	$	—	$	1,064,018	$	499,018	$	565,000



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Cash and Cash Equivalents		Investments
Cash	$	225,235	$	—	$	—	$	225,235	$	225,235	$	—
Time deposits	235,000		—		—		235,000		20,000		215,000
Money market funds	140,800		—		—		140,800		140,800		—
Totals	$	601,035	$	—	$	—	$	601,035	$	386,035	$	215,000

Cash equivalents and investments are considered available-for-sale securities. We use the specific-identification method for calculating realized gains and losses on securities sold and include them in interest expense, net in the condensed consolidated statements of income. Our investment balances represent time deposits with original maturities of greater than three months and less than one year.

Fair Value Measurement

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

The following table summarizes, by major security type, our available-for-sale securities and derivative contracts as of September 30, 2018 and December 31, 2017 that were measured at fair value on a recurring basis and were categorized using the fair value hierarchy (in thousands):



	September 30, 2018						December 31, 2017
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total Estimated Fair Value
Assets:
Available-for-sale securities:
Time deposits	$	—	$	590,000	$	590,000	$	—	$	235,000	$	235,000
Money market funds	192,971		—		192,971		140,800		—		140,800
Interest rate contracts	—		7,824		7,824		—		2,138		2,138
Foreign exchange forward contracts	—		261		261		—		15,495		15,495
Totals	$	192,971	$	598,085	$	791,056	$	140,800	$	252,633	$	393,433
Liabilities:
Interest rate contracts	$	—	$	—	$	—	$	—	$	392	$	392
Foreign exchange forward contracts	—		1,258		1,258		—		5,017		5,017
Totals	$	—	$	1,258	$	1,258	$	—	$	5,409	$	5,409

As of September 30, 2018, our available-for-sale securities included time deposits and money market funds, and their carrying values were approximately equal to their fair values. Time deposits were measured at fair value using Level 2 inputs and money market funds were measured using quoted prices in active markets, which represent Level 1 inputs. Level 2 inputs, obtained from various third party data providers, represent quoted prices for similar assets in active markets, or these inputs were derived from observable market data, or if not directly observable, were derived from or corroborated by other observable market data.

Our derivative assets and liabilities include interest rate and foreign exchange derivatives that are measured at fair value using observable market inputs such as forward rates, interest rates, our own credit risk as well as an evaluation of our counterparties’ credit risks. Based on these inputs, the derivative assets and liabilities are classified within Level 2 of the fair value hierarchy.

There were no transfers between the different levels of the fair value hierarchy in 2018 or in 2017.

As of September 30, 2018, the estimated fair values of our 1.875% exchangeable senior notes due 2021, or the 2021 Notes, and our 1.50% exchangeable senior notes due 2024, or the 2024 Notes, were approximately $619 million and $586 million, respectively. The fair values of the 2021 Notes and the 2024 Notes, which we refer to together as the Exchangeable Senior Notes, were estimated using quoted market prices obtained from brokers (Level 2). The estimated fair value of our borrowing under our term loan was approximately equal to its book value based on the borrowing rates currently available for variable rate loans (Level 2).

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Derivative Instruments and Hedging Activities

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments and Hedging Activities

We are exposed to certain risks arising from operating internationally, including fluctuations in interest rates on our outstanding term loan borrowings and fluctuations in foreign exchange rates primarily related to the translation of euro-denominated net monetary liabilities, including intercompany balances, held by subsidiaries with a U.S. dollar functional currency. We manage these exposures within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes.

To achieve a desired mix of floating and fixed interest rates on our variable rate debt, we entered into interest rate swap agreements in March 2017 which are effective from March 3, 2017 until July 12, 2021. These agreements hedge contractual term loan interest rates. As of September 30, 2018 and December 31, 2017, the interest rate swap agreements had a notional amount of $300.0 million. As a result of these agreements, the interest rate on a portion of our term loan borrowings was fixed at 1.895%, plus the borrowing spread, until July 12, 2021.

The effective portion of changes in the fair value of derivatives designated as and that qualify as cash flow hedges is recorded in accumulated other comprehensive loss and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. The impact on accumulated other comprehensive loss and earnings from derivative instruments that qualified as cash flow hedges for the three and nine months ended September 30, 2018 and 2017 was as follows (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
Interest Rate Contracts:	2018			2017			2018		2017
Gain (loss) recognized in accumulated other comprehensive loss, net of tax	$	876		$	(59	)	$	5,285	$	(2,234	)
Loss (gain) reclassified from accumulated other comprehensive loss to interest expense, net of tax	(130		)	451			19		1,278

Assuming no change in LIBOR-based interest rates from market rates as of September 30, 2018, $1.9 million of gains recognized in accumulated other comprehensive loss will be reclassified to earnings over the next 12 months.

We enter into foreign exchange forward contracts, with durations of up to 12 months, designed to limit the exposure to fluctuations in foreign exchange rates related to the translation of certain non-U.S. dollar denominated liabilities, including intercompany balances. Hedge accounting is not applied to these derivative instruments as gains and losses on these hedge transactions are designed to offset gains and losses on underlying balance sheet exposures. As of September 30, 2018 and December 31, 2017, the notional amount of foreign exchange contracts where hedge accounting is not applied was $210.1 million and $98.7 million, respectively. The foreign exchange loss in our condensed consolidated statements of income included losses of $2.4 million and $10.9 million for the three and nine months ended September 30, 2018, respectively, and gains of $8.0 million and $19.6 million for the three and nine months ended September 30, 2017, respectively, associated with foreign exchange contracts not designated as hedging instruments.

The cash flow effects of our derivative contracts for the nine months ended September 30, 2018 and 2017 are included within net cash provided by operating activities in the condensed consolidated statements of cash flows.

The following tables summarize the fair value of outstanding derivatives (in thousands):



	September 30, 2018
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Interest rate contracts	Other current assets	$	2,150	Accrued liabilities	$	—
	Other non-current assets	5,674
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets	261		Accrued liabilities	1,258
Total fair value of derivative instruments		$	8,085		$	1,258



	December 31, 2017
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Interest rate contracts	Other non-current assets	$	2,138	Accrued liabilities	$	392
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets	15,495		Accrued liabilities	5,017
Total fair value of derivative instruments		$	17,633		$	5,409

Although we do not offset derivative assets and liabilities within our condensed consolidated balance sheets, our International Swap and Derivatives Association agreements provide for net settlement of transactions that are due to or from the same counterparty upon early termination of the agreement due to an event of default or other termination event. The following tables summarize the potential effect on our condensed consolidated balance sheets of offsetting our interest rate contracts and foreign exchange forward contracts subject to such provisions (in thousands):



	September 30, 2018
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,957		$	—	$	1,957		$	(457	)	$	—	$	1,500
Derivative liabilities	(457		)	—		(457		)	457			—		—



	December 31, 2017
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,639		$	—	$	1,639		$	(875	)	$	—	$	764
Derivative liabilities	(875		)	—		(875		)	875			—		—

Inventories

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in thousands):



	September 30, 2018		December 31, 2017
Raw materials	$	2,482	$	3,542
Work in process	24,456		15,692
Finished goods	16,497		24,011
Total inventories	$	43,435	$	43,245

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

The gross carrying amount of goodwill was as follows (in thousands):



Balance at December 31, 2017	$	947,537
Foreign exchange	(15,115		)
Balance at September 30, 2018	$	932,422

The gross carrying amounts and net book values of our intangible assets were as follows (in thousands):



	September 30, 2018								December 31, 2017
	Remaining Weighted- Average Useful Life (In years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Acquired developed technologies	14.6	$	3,122,811	$	(590,198	)	$	2,532,613	$	3,392,832	$	(562,473	)	$	2,830,359
Priority review voucher		111,100		—			111,100		—		—			—
Manufacturing contracts	—	12,391		(12,391		)	—		12,824		(12,634		)	190
Trademarks	—	2,899		(2,899		)	—		2,910		(2,910		)	—
Total finite-lived intangible assets		3,249,201		(605,488		)	2,643,713		3,408,566		(578,017		)	2,830,549
Acquired IPR&D assets		143,568		—			143,568		148,578		—			148,578
Total intangible assets		$	3,392,769	$	(605,488	)	$	2,787,281	$	3,557,144	$	(578,017	)	$	2,979,127

The decrease in the gross carrying amount of intangible assets as of September 30, 2018 compared to December 31, 2017 reflects the sale of the Prialt acquired developed technology asset to TerSera in September 2018 and the negative impact of foreign currency translation adjustments, which was due to the weakening of the euro against the U.S. dollar, partially offset by our purchase of a rare pediatric disease priority review voucher, or PRV, from Spark Therapeutics, Inc. As we may use the PRV to obtain priority review by the FDA for one of our future regulatory submissions or may sell or transfer the PRV to a third party, we capitalized the acquisition cost, including direct transaction costs, as a finite-lived intangible asset upon closing of the transaction in May 2018.

The assumptions and estimates used to determine future cash flows and remaining useful lives of our intangible and other long-lived assets are complex and subjective. They can be affected by various factors, including external factors, such as industry and economic trends, and internal factors such as changes in our business strategy and our forecasts for specific product lines.

Based on acquired developed technology intangible assets recorded as of September 30, 2018, and assuming the underlying assets will not be impaired and that we will not change the expected lives of the assets, future amortization expenses were estimated as follows (in thousands):



Year Ending December 31,	Estimated Amortization Expense
2018 (remainder)	$	46,802
2019	187,208
2020	185,969
2021	184,955
2022	184,246
Thereafter	1,743,433
Total	$	2,532,613

Certain Balance Sheet Items

9 Months Ended

Sep. 30, 2018

Certain Balance Sheet Items [Abstract]

Certain Balance Sheet Items

Property, plant and equipment consisted of the following (in thousands):



	September 30, 2018			December 31, 2017
Build-to-suit facility	$	52,222		$	51,721
Land and buildings	46,815			46,729
Construction-in-progress	46,058			21,738
Leasehold improvements	32,623			28,779
Manufacturing equipment and machinery	25,573			23,586
Computer software	19,135			19,969
Computer equipment	14,059			12,814
Furniture and fixtures	8,059			5,947
Subtotal	244,544			211,283
Less accumulated depreciation and amortization	(46,491		)	(41,203		)
Property, plant and equipment, net	$	198,053		$	170,080

Accrued liabilities consisted of the following (in thousands):



	September 30, 2018		December 31, 2017
Rebates and other sales deductions	$	88,443	$	81,368
Estimated loss contingency	57,753		—
Employee compensation and benefits	49,845		54,930
Clinical trial accruals	8,387		2,181
Selling and marketing accruals	5,837		3,189
Inventory-related accruals	3,290		3,002
Royalties	3,293		8,058
Accrued interest	2,678		7,297
Sales returns reserve	2,473		3,651
Professional fees	2,368		3,213
Derivative instrument liabilities	1,258		5,409
Other	31,828		26,481
Total accrued liabilities	$	257,453	$	198,779

Debt

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

The following table summarizes the carrying amount of our indebtedness (in thousands):



	September 30, 2018			December 31, 2017
2021 Notes	$	575,000		$	575,000
Unamortized discount and debt issuance costs on 2021 Notes	(66,269		)	(81,627		)
2021 Notes, net	508,731			493,373

2024 Notes	575,000			575,000
Unamortized discount and debt issuance costs on 2024 Notes	(144,018		)	(158,680		)
2024 Notes, net	430,982			416,320

Term loan	654,256			671,345
Total debt	1,593,969			1,581,038
Less current portion	33,387			40,605
Total long-term debt	$	1,560,582		$	1,540,433

Amendment of Credit Facility

On June 18, 2015, Jazz Pharmaceuticals plc, as guarantor, and certain of our wholly owned subsidiaries, as borrowers, entered into a credit agreement, or the 2015 credit agreement, that provided for a $750.0 million principal amount term loan, which was drawn in full at closing, and a $750.0 million revolving credit facility, of which $160.0 million was drawn at closing and subsequently repaid. We used the proceeds from initial borrowings under the 2015 credit agreement to repay in full the $893.1 million principal amount of term loans outstanding under the credit agreement that we entered into in June 2012, as subsequently amended, which we refer to as the previous credit agreement, and to pay related fees and expenses. The previous credit agreement was terminated upon repayment of the term loans outstanding thereunder.

On July 12, 2016, we amended the 2015 credit agreement to provide for a revolving credit facility of $1.25 billion and a $750.0 million term loan facility. We used the proceeds of $1.0 billion of loans under the revolving credit facility, together with cash on hand, to fund the acquisition of Celator Pharmaceuticals, Inc., or Celator.

On June 7, 2018, we entered into a second amendment to the 2015 credit agreement to provide for a revolving credit facility of $1.6 billion, which replaced the existing revolving credit facility of $1.25 billion, and a new $667.7 million term loan facility, which replaced the $750.0 million term loan facility, of which $659.4 million principal amount was outstanding as of September 30, 2018. We refer to the 2015 credit agreement as amended by the first and second amendments as the amended credit agreement. We expect to use the proceeds from future loans under the revolving credit facility, if any, for permitted capital expenditures, permitted acquisitions, to provide for ongoing working capital requirements and for other general corporate purposes.

Under the amended credit agreement, the term loan matures on June 7, 2023 and the revolving credit facility terminates, and any loans outstanding thereunder become due and payable, on June 7, 2023.

Borrowings under the amended credit agreement bear interest, at our option, at a rate equal to either (a) the LIBOR rate, plus an applicable margin ranging from 1.375% to 1.750% per annum, based upon our secured leverage ratio, or (b) the prime lending rate, plus an applicable margin ranging from 0.375% to 0.750% per annum, based upon our secured leverage ratio. The revolving credit facility has a commitment fee payable on the undrawn amount ranging from 0.25% to 0.35% per annum based upon our secured leverage ratio.

Jazz Pharmaceuticals plc and certain of our wholly owned subsidiaries are borrowers under the amended credit agreement. The borrowers’ obligations under the amended credit agreement and any hedging or cash management obligations entered into with a lender are guaranteed on a senior secured basis by Jazz Pharmaceuticals plc and certain of our subsidiaries (including the issuer of the Exchangeable Senior Notes as described below) and are secured by substantially all of Jazz Pharmaceuticals plc’s, the borrowers’ and the guarantor subsidiaries’ assets.

We may make voluntary prepayments of principal at any time without payment of a premium. We are required to make mandatory prepayments of the term loan (without payment of a premium) with (1) net cash proceeds from certain non-ordinary course asset sales (subject to other exceptions), (2) net cash proceeds from issuances of debt (other than certain permitted debt), and (3) casualty proceeds and condemnation awards (subject to other exceptions).

Principal repayments of the term loan, which are due quarterly, are equal to 5.0% per annum of the principal amount outstanding on June 7, 2018 of $667.7 million, with any remaining balance payable on the maturity date.

The amended credit agreement contains financial covenants that require Jazz Pharmaceuticals plc and our restricted subsidiaries to not (a) exceed a maximum secured net leverage ratio or (b) fall below a cash interest coverage ratio. As of September 30, 2018, we were in compliance with these financial covenants.

Exchangeable Senior Notes

The Exchangeable Senior Notes were issued by Jazz Investments I Limited, or the Issuer, a 100%-owned finance subsidiary of Jazz Pharmaceuticals plc. The Exchangeable Senior Notes are senior unsecured obligations of the Issuer and are fully and unconditionally guaranteed on a senior unsecured basis by Jazz Pharmaceuticals plc. No subsidiary of Jazz Pharmaceuticals plc guaranteed the Exchangeable Senior Notes. Subject to certain local law restrictions on payment of dividends, among other things, and potential negative tax consequences, we are not aware of any significant restrictions on the ability of Jazz Pharmaceuticals plc to obtain funds from the Issuer or Jazz Pharmaceuticals plc’s other subsidiaries by dividend or loan, or any legal or economic restrictions on the ability of the Issuer or Jazz Pharmaceuticals plc’s other subsidiaries to transfer funds to Jazz Pharmaceuticals plc in the form of cash dividends, loans or advances. There is no assurance that in the future such restrictions will not be adopted.

As of September 30, 2018, the carrying values of the equity component of the 2021 Notes and the 2024 Notes, net of equity issuance costs, were $126.9 million and $149.8 million, respectively.

Maturities

Scheduled maturities with respect to our long-term debt principal balances outstanding as of September 30, 2018 were as follows (in thousands):



Year Ending December 31,	Scheduled Long-Term Debt Maturities
2018 (remainder)	$	8,346
2019	33,387
2020	33,387
2021	608,387
2022	33,387
Thereafter	1,092,494
Total	$	1,809,388

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Indemnification In the normal course of business, we enter into agreements that contain a variety of representations and warranties and provide for general indemnification, including indemnification associated with product liability or infringement of intellectual property rights. Our exposure under these agreements is unknown because it involves future claims that may be made but have not yet been made against us. To date, we have not paid any claims or been required to defend any action related to these indemnification obligations. We have agreed to indemnify our executive officers, directors and certain other employees for losses and costs incurred in connection with certain events or occurrences, including advancing money to cover certain costs, subject to certain limitations. The maximum potential amount of future payments we could be required to make under the indemnification obligations is unlimited; however, we maintain insurance policies that may limit our exposure and may enable us to recover a portion of any future amounts paid. Assuming the applicability of coverage, the willingness of the insurer to assume coverage, and subject to certain retention, loss limits and other policy provisions, we believe the fair value of these indemnification obligations is not significant. Accordingly, we did not recognize any liabilities relating to these obligations as of September 30, 2018 and December 31, 2017. No assurances can be given that the covering insurers will not attempt to dispute the validity, applicability, or amount of coverage without expensive litigation against these insurers, in which case we may incur substantial liabilities as a result of these indemnification obligations. Lease and Other Commitments Facility Leases. In January 2015, we entered into an agreement to lease office space located in Palo Alto, California in a building subsequently constructed by the landlord. The term of this lease is 12 years from the commencement date as defined in the lease agreement and we have an option to extend the term twice for a period of five years each. We are the deemed owner of the building based on applicable accounting guidance for build-to-suit leases. Accordingly, the landlord’s costs of constructing the building were capitalized on our condensed consolidated balance sheets offset by a corresponding financing obligation. We began to occupy this office space in October 2017. As of September 30, 2018, the total amount of the related financing obligation was $62.9 million, which is classified within current liabilities and non-current liabilities on our condensed consolidated balance sheets. In September 2017, we entered into an agreement to lease office space located in Palo Alto, California in a second building to be constructed by the same landlord. We expect to occupy this office space by the end of 2019. This lease has a term of 12 years from the commencement date as defined in the lease agreement and we have an option to extend the term of the lease twice for a period of 5 years each. We are the deemed owner of the building during the construction period based on applicable accounting guidance for build-to-suit leases. As of September 30, 2018, we recorded project construction costs of $43.7 million incurred by the landlord as construction-in-progress in property, plant and equipment, net and a corresponding financing obligation in other non-current liabilities on our condensed consolidated balance sheets. We will increase the asset and financing obligation as additional building costs are incurred by the landlord during the construction period. Operating Leases. We have noncancelable operating leases for our office buildings and we are obligated to make payments under noncancelable operating leases for automobiles used by our sales force. Other Commitments. As of September 30, 2018, we had $54.7 million of noncancelable purchase commitments due within one year, primarily related to agreements with third party manufacturers. Legal Proceedings Xyrem ANDA Litigation and Settlements. In December 2012, we received a notice of Paragraph IV Patent Certification, or Paragraph IV Certification, from Amneal Pharmaceuticals LLC, or Amneal, that it had submitted an ANDA to the FDA requesting approval to market a generic version of Xyrem. In January 2013, we filed a lawsuit against Amneal in the federal district court of New Jersey, or District Court, alleging that our patents covering Xyrem are infringed or will be infringed by Amneal’s ANDA and seeking a permanent injunction to prevent Amneal from introducing a generic version of Xyrem that would infringe these patents. Additional patents covering Xyrem were issued after the date of the original lawsuit against Amneal, and lawsuits we brought against Amneal involving those patents were consolidated into a single case in the District Court. In October 2018, we entered into a settlement agreement and related agreements resolving our patent infringement litigation against Amneal in the District Court, and the District Court subsequently approved an order dismissing the litigation. We previously settled lawsuits against the eight other companies that have sent us notices that they had filed ANDAs requesting approval to market a generic version of Xyrem. As a result, the settlement with Amneal represents settlement of all outstanding patent infringement litigation related to Xyrem. It is possible that additional companies may file ANDAs seeking to market a generic version of Xyrem or submit new drug applications referencing Xyrem, which could lead to additional patent litigation or challenges with respect to Xyrem. The settlements with the nine ANDA filers are described below. In our settlement with the first filer, West-Ward Pharmaceuticals Corp. (a wholly owned subsidiary of Hikma Pharmaceuticals PLC), or West-Ward, we granted West-Ward the right to sell an authorized generic version of Xyrem, or AG Product, in the U.S. beginning on January 1, 2023, or earlier under certain circumstances, including circumstances related to the licensing or market entry of another generic sodium oxybate product, a final decision that all unexpired claims of the Xyrem patents are invalid and/or unenforceable, or a substantial reduction in Xyrem net sales over specified periods of time. West-Ward has an option to continue to sell the West-Ward AG Product for up to five years, and we are entitled to receive a meaningful royalty on net sales of the West-Ward AG Product, as well as payment for the supply of the West-Ward AG Product and reimbursement for a portion of the services costs associated with distribution of the West-Ward AG Product through the Xyrem REMS. We also granted West-Ward a license under the Xyrem patents to launch its own generic sodium oxybate product as early as six months after it has the right to sell the AG Product, but if it elects to sell its own generic sodium oxybate product, West-Ward will not be able to continue to sell the West-Ward AG Product. In our settlements with Amneal, Lupin Inc., or Lupin, and Par Pharmaceutical, Inc., or Par, we granted each of them the right to sell a limited volume of an AG Product in the U.S. beginning on July 1, 2023, or earlier under certain circumstances. Such circumstances include events related to acceleration of West-Ward’s AG Product launch date, the earlier launch of another party’s AG Product, the launch of another generic sodium oxybate product, or a final decision that all unexpired claims of the Xyrem patents are not infringed, or are invalid and/or unenforceable. The volume of each of Amneal’s, Lupin’s and Par’s AG Products is limited to an annual amount equal to a low single-digit percentage of Xyrem sales volume during the calendar year preceding the entry date of such party’s AG Product, and each party’s right to sell its AG Product ends on December 31, 2025. We also granted each of Amneal, Lupin and Par a license under the Xyrem patents to launch its own generic sodium oxybate product under its ANDA (assuming FDA approval of its ANDA is obtained or maintained) on or after December 31, 2025, or earlier under certain circumstances. Such circumstances include events related to launch of a generic sodium oxybate product by West-Ward or another company under its ANDA, or a final decision that all unexpired claims of the Xyrem patents are not infringed, or are invalid and/or unenforceable. If an acceleration event occurs, then each of Amneal, Par and Lupin will have the option to elect to market its AG Product until December 31, 2025, but such party will not be entitled to market its AG Product and its own generic sodium oxybate product simultaneously. We are entitled to receive a meaningful royalty on net sales of each of Amneal’s, Lupin’s and Par’s AG Products, as well as payment for the supply of each party’s AG Product and reimbursement for a portion of the services costs associated with distribution of each party’s AG Product through the Xyrem REMS. In our settlements with each of the other five ANDA filers, we granted each a license under the Xyrem patents to launch its own generic sodium oxybate product under its ANDA (assuming FDA approval of its ANDA is obtained or maintained) on or after December 31, 2025, or earlier under certain circumstances. Such circumstances include the launch by West-Ward or another company of a generic sodium oxybate product. The specific terms of all of the settlement agreements are confidential. Xyrem Post-Grant Patent Review Matters. In January 2015, certain of the ANDA filers filed petitions for inter partes review, or IPR, with respect to the validity of six of our seven patents associated with the Xyrem REMS, or REMS patents. The Patent Trial and Appeal Board, or PTAB, of the U.S. Patent and Trademark Office instituted IPR trials with respect to certain of these petitions. In July 2016, the PTAB issued final decisions that the claims of the six REMS patents are unpatentable. In March 2017, the PTAB issued a final decision that three claims of a seventh REMS patent are unpatentable. On July 13, 2018, the United States Court of Appeals for the Federal Circuit upheld the July 2016 and March 2017 PTAB decisions on appeal, and as a result, we will not be able to enforce claims the PTAB found unpatentable. We cannot predict whether new parties will petition for post-grant patent review in the future, the outcome of any future IPR or other proceeding or the impact any IPR or other proceeding might have on any future ANDA or other patent litigation proceedings or other aspects of our Xyrem business. From time to time we are involved in legal proceedings arising in the ordinary course of business. We believe there is no litigation pending that could have, individually or in the aggregate, a material adverse effect on our results of operations or financial condition. Other Contingencies In May and October 2016 and in February 2017, we received subpoenas from the U.S. Attorney’s Office for the District of Massachusetts requesting documents related to our support of 501(c)(3) organizations that provide financial assistance to Medicare patients, and, for Xyrem, documents concerning the provision of financial assistance to Medicare patients. Other companies have disclosed similar subpoenas and continuing inquiries. We have a comprehensive program intended to ensure our compliance with applicable legal and regulatory requirements for pharmaceutical companies, including guidelines established by the Office of Inspector General of the U.S. Department of Health and Human Services regarding patient assistance programs, and we have been cooperating with the government’s investigation. We have engaged in discussions with the U.S. Department of Justice, or DOJ, about a possible resolution, and in April 2018, we reached an agreement in principle with the DOJ on a proposal for a civil settlement of potential claims by the DOJ in the amount of $57.0 million, subject to accrual of interest on the settlement amount from the date of the agreement in principle, negotiation of a definitive settlement agreement and other contingencies. During the nine months ended September 30, 2018, we recorded $57.8 million related to this matter, including related interest, within accrued liabilities on our condensed consolidated balance sheet with the related expense included in selling, general and administrative expenses on our condensed consolidated statement of income. Material issues remain subject to further negotiation and approval by us and the DOJ before the proposed settlement can be finalized. We cannot provide assurances that our efforts to reach a final settlement with the DOJ will be successful or, if they are, the timing or final terms of any such settlement. Any such settlement is also likely to involve entry into a corporate integrity agreement, which would impose costs and burdens on the operation of our business. If we do not reach a final settlement, the outcome of this investigation could include an enforcement action against us. If the federal government were to file an enforcement action against us as a result of the investigation and could establish the elements of a violation of relevant laws, we could be subject to damages, fines and penalties, which could be substantial, along with other criminal, civil or administrative sanctions, and we would expect to incur significant costs in connection with such enforcement action, regardless of the outcome.

Shareholders' Equity

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

The following tables present a reconciliation of our beginning and ending balances in shareholders’ equity for the nine months ended September 30, 2018 and 2017 (in thousands):



	Total Shareholders' Equity
Shareholders' equity at January 1, 2018	$	2,713,097
Effect of adoption of new accounting standards	(298		)
Issuance of ordinary shares in conjunction with employee equity incentive and purchase plans	84,056
Employee withholding taxes related to share-based awards	(17,192		)
Share-based compensation	75,682
Shares repurchased	(77,015		)
Other comprehensive loss	(38,641		)
Net income	287,628
Shareholders' equity at September 30, 2018	$	3,027,317



	Total Shareholders' Equity
Shareholders' equity at January 1, 2017	$	1,877,339
Issuance of 2024 Notes	149,767
Issuance of ordinary shares in conjunction with employee equity incentive and purchase plans	22,793
Employee withholding taxes related to share-based awards	(17,909		)
Share-based compensation	79,745
Shares repurchased	(56,425		)
Other comprehensive income	158,346
Net income	255,641
Shareholders' equity at September 30, 2017	$	2,469,297

Share Repurchase Program

In November 2016, our board of directors authorized a share repurchase program pursuant to which we are authorized to repurchase a number of ordinary shares having an aggregate purchase price of up to $300 million, exclusive of any brokerage commissions. In the nine months ended September 30, 2018, we spent a total of $77.0 million to purchase 0.5 million of our ordinary shares under the share repurchase program at an average total purchase price, including commissions, of $154.03 per share. As of September 30, 2018, the remaining amount authorized under the share repurchase program was $105.7 million.

In November 2018, our board of directors increased the existing share repurchase program authorization by an aggregate purchase price of $320 million, exclusive of any brokerage commissions.

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss as of September 30, 2018 and December 31, 2017 were as follows (in thousands):



	Net Unrealized Gain From Hedging Activities		Foreign Currency Translation Adjustments			Total Accumulated Other Comprehensive Loss
Balance at December 31, 2017	$	1,482	$	(142,360	)	$	(140,878	)
Effect of adoption of ASU No. 2017-12	53		—			53
Balance at January 1, 2018	1,535		(142,360		)	(140,825		)
Other comprehensive income (loss) before reclassifications	5,285		(43,945		)	(38,660		)
Amounts reclassified from accumulated other comprehensive loss	19		—			19
Other comprehensive income (loss), net	5,304		(43,945		)	(38,641		)
Balance at September 30, 2018	$	6,839	$	(186,305	)	$	(179,466	)

During the nine months ended September 30, 2018, other comprehensive loss reflects foreign currency translation adjustments, primarily due to the weakening of the euro against the U.S. dollar, and the net unrealized gain on derivatives that qualify as cash flow hedges.

Net Income per Ordinary Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Net Income per Ordinary Share

Basic net income per ordinary share is based on the weighted-average number of ordinary shares outstanding. Diluted net income per ordinary share is based on the weighted-average number of ordinary shares outstanding and potentially dilutive ordinary shares outstanding.

Basic and diluted net income per ordinary share were computed as follows (in thousands, except per share amounts):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Numerator:
Net income	$	149,316	$	63,526	$	287,628	$	255,641
Denominator:
Weighted-average ordinary shares used in per share calculations - basic	60,476		60,108		60,196		60,030
Dilutive effect of employee equity incentive and purchase plans	1,381		1,328		1,297		1,330
Weighted-average ordinary shares used in per share calculations - diluted	61,857		61,436		61,493		61,360

Net income per ordinary share:
Basic	$	2.47	$	1.06	$	4.78	$	4.26
Diluted	$	2.41	$	1.03	$	4.68	$	4.17

Potentially dilutive ordinary shares from our employee equity incentive and purchase plans and the Exchangeable Senior Notes are determined by applying the treasury stock method to the assumed exercise of share options, the assumed vesting of outstanding restricted stock units, or RSUs, the assumed issuance of ordinary shares under our employee stock purchase plan, or ESPP, and the assumed issuance of ordinary shares upon exchange of the Exchangeable Senior Notes. The potential issue of ordinary shares issuable upon exchange of the Exchangeable Senior Notes had no effect on diluted net income per ordinary share because the average price of our ordinary shares for the three and nine months ended September 30, 2018 and 2017 did not exceed the effective exchange prices per ordinary share of the Exchangeable Senior Notes.

The following table represents the weighted-average ordinary shares that were excluded from the calculation of diluted net income per ordinary share for the periods presented because including them would have an anti-dilutive effect (in thousands):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Exchangeable Senior Notes	5,504	3,958	5,504	3,238
Options to purchase ordinary shares and RSUs	2,230	2,998	2,959	3,175
Ordinary shares under ESPP	14	16	16	9

Revenues

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenues

The following table presents a summary of total revenues (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Xyrem	$	357,251	$	303,870	$	1,030,036	$	874,222
Erwinaze/Erwinase	41,134		49,173		150,474		149,585
Defitelio/defibrotide	36,177		31,213		111,736		97,351
Vyxeos	21,038		9,719		75,217		9,719
Prialt	5,792		7,930		20,839		21,303
Other	3,805		6,066		13,837		19,124
Product sales, net	465,197		407,971		1,402,139		1,171,304
Royalties and contract revenues	4,176		3,884		12,326		10,990
Total revenues	$	469,373	$	411,855	$	1,414,465	$	1,182,294

The following table presents a summary of total revenues attributed to geographic sources (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
United States	$	429,729	$	372,846	$	1,290,775	$	1,068,716
Europe	30,816		30,297		94,165		89,027
All other	8,828		8,712		29,525		24,551
Total revenues	$	469,373	$	411,855	$	1,414,465	$	1,182,294

The following table presents a summary of the percentage of total revenues from customers that represented more than 10% of our total revenues:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Express Scripts	76	%	74	%	73	%	74	%
McKesson	15	%	14	%	18	%	14	%

Financing and payment

Our payment terms vary by the type and location of our customer but payment is generally required in a term ranging from 30 to 45 days.

Contract Liabilities - Deferred Revenue

The deferred revenue balance as of September 30, 2018 primarily related to deferred upfront fees received from Nippon Shinyaku Co., Ltd., or Nippon Shinyaku, in connection with two license, development and commercialization agreements granting Nippon Shinyaku exclusive rights to develop and commercialize each of Defitelio and Vyxeos in Japan. We recognized contract revenues of $1.9 million and $5.6 million during the three and nine months ended September 30, 2018, respectively, relating to these upfront payments. The deferred revenue balances are being recognized over an average of four years representing the period we expect to perform our research and developments obligations under each agreement.

The following table presents a reconciliation of our beginning and ending balances in contract liabilities from contracts with customers for the nine months ended September 30, 2018 (in thousands):



	Contract Liabilities
Balance as of December 31, 2017	$	24,733
Effect of adoption of ASU 2014-09	(2,240		)
Amount recognized within royalties and contract revenues	(5,624		)
Balance as of September 30, 2018	$	16,869

Share-Based Compensation

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-based compensation expense related to share options, RSUs and grants under our ESPP was as follows (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Selling, general and administrative	$	18,978		$	20,903		$	57,012		$	61,582
Research and development	4,600			4,650			13,684			13,651
Cost of product sales	1,525			1,573			5,022			4,346
Total share-based compensation expense, pre-tax	25,103			27,126			75,718			79,579
Income tax benefit from share-based compensation expense	(3,552		)	(6,354		)	(12,066		)	(23,816		)
Total share-based compensation expense, net of tax	$	21,551		$	20,772		$	63,652		$	55,763

Share Options

The table below shows the number of shares underlying options granted to purchase our ordinary shares, the weighted-average assumptions used in the Black-Scholes option pricing model and the resulting weighted-average grant date fair value of share options granted:



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Shares underlying options granted (in thousands)	117			87			1,349			1,343
Grant date fair value	$	53.93		$	45.87		$	46.95		$	42.69
Black-Scholes option pricing model assumption information:
Volatility	32		%	35		%	35		%	35		%
Expected term (years)	4.5			4.3			4.5			4.3
Range of risk-free rates	2.7-2.8%			1.6-1.8%			2.2-2.8%			1.6-1.8%
Expected dividend yield	—		%	—		%	—		%	—		%

Restricted Stock Units

The table below shows the number of RSUs granted covering an equal number of our ordinary shares and the weighted-average grant date fair value of RSUs granted:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
RSUs granted (in thousands)	71		35		564		537
Grant date fair value	$	174.73	$	148.60	$	145.59	$	137.23

The fair value of RSUs is determined on the date of grant based on the market price of our ordinary shares on that date. The fair value of RSUs is expensed ratably over the vesting period, generally over four years.

As of September 30, 2018, compensation cost not yet recognized related to unvested share options and RSUs was $82.8 million and $102.7 million, respectively, which is expected to be recognized over a weighted-average period of 2.7 years and 2.6 years, respectively.

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our income tax provision was $19.3 million and $75.0 million in the three and nine months ended September 30, 2018, respectively, compared to $1.2 million and $65.9 million for the same periods in 2017. The effective tax rates were 11.4% and 20.6% in the three and nine months ended September 30, 2018, respectively, compared to 1.9% and 20.5% for the same periods in 2017. The increase in the effective tax rate for the three months ended September 30, 2018 compared to the same period in 2017 was primarily due to the release of a valuation allowance held against certain foreign net operating losses in 2017 and the impacts of movements on unrecognized tax benefits, partially offset by a decrease in the U.S. corporate income tax rate. The effective tax rate for the nine months ended September 30, 2018 was in line with the same period in 2017. The effective tax rate for the three months ended September 30, 2018 was lower than the Irish statutory rate of 12.5% primarily due to the release of reserves related to unrecognized tax benefits upon the expiration of a statute of limitations. The effective tax rate for the nine months ended September 30, 2018 was higher than the Irish statutory rate of 12.5% primarily due to income taxable at a rate higher than the Irish statutory rate, various expenses not deductible for income tax purposes and unrecognized tax benefits. We do not provide for Irish income taxes on undistributed earnings of our foreign operations that are intended to be indefinitely reinvested in our foreign subsidiaries. Our net deferred tax liability primarily arose due to the acquisition of Celator. The balance is net of deferred tax assets which are comprised primarily of U.S. federal and state tax credits, U.S. federal and state and foreign net operating loss carryforwards and other temporary differences. We maintain a valuation allowance against certain foreign and U.S. federal and state deferred tax assets. Each reporting period, we evaluate the need for a valuation allowance on our deferred tax assets by jurisdiction and adjust our estimates as more information becomes available. We are required to recognize the financial statement effects of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. As a result, we have recorded an unrecognized tax benefit for certain tax benefits which we judge may not be sustained upon examination. Our most significant tax jurisdictions are Ireland, the U.S. (both at the federal level and in various state jurisdictions), Italy and France. These jurisdictions have statutes of limitations ranging from three to five years. However, in the U.S. (at the federal level and in most states), carryforward tax attributes that were generated in 2013 and earlier may still be adjusted upon examination by the tax authorities. Certain of our subsidiaries are currently under examination by the French tax authorities for the years ended December 31, 2012, 2013, 2015, 2016 and 2017. These examinations may lead to ordinary course adjustments or proposed adjustments to our taxes. In December 2015, we received proposed tax assessment notices, and, in October 2018, we received revised tax assessment notices from the French tax authorities for 2012 and 2013 relating to certain transfer pricing adjustments. The notices provide for additional French tax of approximately $43 million, including interest and penalties through the date of the proposed assessment, translated at the foreign exchange rate at September 30, 2018. We disagree with the assessments and are contesting them vigorously. During the three and nine months ended September 30, 2018, we recorded an income tax expense of $2.9 million as a provisional measurement period adjustment to the provisional estimates recorded as of December 31, 2017 in accordance with the SEC’s Staff Accounting Bulletin No. 118, or SAB 118. The provisional measurement period adjustment was due to additional analysis on the one-time transition tax on deemed repatriated earnings of foreign subsidiaries. We will continue to analyze the impact of the U.S. Tax Cuts and Jobs Act of 2017 under SAB 118 and may record further adjustments to provisional amounts as our analyses are completed in the fourth quarter of 2018.

The Company and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These unaudited condensed consolidated financial statements have been prepared following the requirements of the U.S. Securities and Exchange Commission, or SEC, for interim reporting. As permitted under those rules, certain footnotes and other financial information that are normally required by U.S. generally accepted accounting principles, or U.S. GAAP, can be condensed or omitted. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with our annual consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2017. In the opinion of management, these condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and include all adjustments, consisting only of normal recurring adjustments, considered necessary for the fair presentation of our financial position and operating results. The results for the three and nine months ended September 30, 2018 are not necessarily indicative of the results to be expected for the year ending December 31, 2018, for any other interim period or for any future period. Except for the revenue recognition accounting policy that was updated as a result of adopting Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers”, or ASU No. 2014-09, our significant accounting policies have not changed substantially from those previously described in our Annual Report on Form 10-K for the year ended December 31, 2017. These condensed consolidated financial statements include the accounts of Jazz Pharmaceuticals plc and our subsidiaries, and intercompany transactions and balances have been eliminated. Our operating segment is reported in a manner consistent with the internal reporting provided to the chief operating decision maker, or CODM. Our CODM has been identified as our chief executive officer. We have determined that we operate in one business segment, which is the identification, development and commercialization of meaningful pharmaceutical products that address unmet medical needs.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures in the condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on assumptions believed to be reasonable under the circumstances. Actual results could differ materially from those estimates.
Adoption of New Accounting Standards and Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract”, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard is effective for us beginning January 1, 2020 and early adoption is permitted. The new guidance is not expected to have a material impact on our results of operations and financial position. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” which simplifies the accounting for goodwill impairment by eliminating Step 2 of the current goodwill impairment test. Goodwill impairment will now be the amount by which the reporting unit’s carrying value exceeds its fair value, limited to the carrying value of the goodwill. The standard is effective for us beginning January 1, 2020. Early adoption is permitted for any impairment tests performed after January 1, 2017. The new guidance is not expected to have a material impact on our results of operations and financial position. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”, or ASU No. 2016-02. Under the new guidance, lessees will be required to recognize a right-of-use asset, which represents the lessee’s right to use, or control the use of, a specified asset for the lease term, and a corresponding lease liability, which represents the lessee’s obligation to make lease payments under a lease, measured on a discounted basis. ASU No. 2016-02 is effective beginning January 1, 2019 and early adoption is permitted. ASU No. 2016-02 must be adopted on a modified retrospective transition basis at the beginning of the earliest comparative period presented in the consolidated financial statements or at the adoption date. The adoption of ASU No. 2016-02 will result in a significant increase in our consolidated balance sheet for right-of-use assets and lease liabilities. While we are continuing to assess all potential impacts of the standard, we currently believe the most significant impact relates to our accounting for the lease agreements we entered into in January 2015 and September 2017 to lease office space located in Palo Alto, California in buildings constructed or to be constructed by the landlord, which are accounted for as build-to-suit arrangements under existing accounting standards, and the lease agreement we entered into in August 2016 for office space in Dublin, Ireland. The future minimum lease payments under these leases at September 30, 2018 were $208.6 million. Based on our initial evaluation of the impact of ASU No. 2016-02 on our build-to-suit facility leases, we expect to de-recognize existing build-to-suit assets and liabilities upon the adoption of ASU No. 2016-02. Adoption of New Accounting Standards In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-09. The standard states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this, an entity will need to identify the contract with a customer; identify the separate performance obligations in the contract; determine the transaction price; allocate the transaction price to the separate performance obligations in the contract; and recognize revenue when (or as) the entity satisfies each performance obligation. We adopted ASU No. 2014-09 on January 1, 2018 on a modified retrospective basis. The adoption of ASU No. 2014-09 did not have a material impact on our results of operations and financial position as the timing of revenue recognition for product sales, net, which is our primary revenue stream, did not change. Refer to Note 13, Revenues, for revenue-related disclosures. In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments” which addresses how certain cash receipts and cash payments are presented and classified in the statement of cash flows. We adopted this standard on January 1, 2018 and adoption did not have a material impact on our consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, “Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory” which requires an entity to recognize the income tax consequences of an intra-entity asset transfer, other than an intra-entity asset transfer of inventory, when the transfer occurs. We adopted this standard on January 1, 2018 on a modified retrospective basis and adoption did not have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” which provides clarification on the definition of a business and adds guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. We adopted this standard on January 1, 2018. In the second quarter of 2018, we entered into an asset purchase agreement, or APA, with TerSera Therapeutics LLC, or TerSera, whereby TerSera agreed to purchase substantially all of our assets related to the manufacture, marketing and sale of Prialt^®(ziconotide) intrathecal infusion. We entered into an amendment to the APA, and the transaction closed on September 27, 2018. We determined that the disposal group did not constitute a business under the new guidance. Refer to Note 2, Disposition, for further information on the sale of our rights to Prialt. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities”, or ASU No. 2017-12. ASU No. 2017-12 amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in their financial statements. ASU No. 2017-12 is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to early adopt this standard on January 1, 2018 on a modified retrospective basis. Adoption of this standard did not have a material impact on our consolidated financial statements.
Revenue Recognition	Revenue Recognition Our revenue comprises product sales, net and royalty and contract revenues. Revenues are recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Prior to recognizing revenue, we make estimates of the transaction price, including variable consideration that is subject to a constraint. Amounts of variable consideration are included in the transaction price to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. Product Sales, Net Product sales revenue is recognized when control has transferred to the customer, which occurs at a point in time, which is typically on delivery to the customer or, in the case of products that are subject to consignment agreements, when the customer removes product from our consigned inventory location for shipment directly to a patient. Reserves for Variable Consideration Revenues from sales of products are recorded at the net sales price, which includes estimates of variable consideration for which reserves are established and which relate to returns, specialty distributor fees, wholesaler fees, prompt payment discounts, government rebates, government chargebacks, coupon programs and rebates under managed care plans. Calculating certain of these reserves involves estimates and judgments and we determine their expected value based on sales or invoice data, contractual terms, historical utilization rates, new information regarding changes in these programs’ regulations and guidelines that would impact the amount of the actual rebates, our expectations regarding future utilization rates for these programs and channel inventory data. These reserves reflect our best estimates of the amount of consideration to which we are entitled based on the terms of the contract. The amount of variable consideration that is included in the transaction price may be constrained, and is included in the net sales price only to the extent that it is probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. We reassess our reserves for variable consideration at each reporting date. Historically, adjustments to estimates for these reserves have not been material. Reserves for returns, specialty distributor fees, wholesaler fees, government rebates, coupon programs and rebates under managed care plans are included within current liabilities in our condensed consolidated balance sheets. Reserves for government chargebacks and prompt payment discounts are shown as a reduction in accounts receivable. Royalties and Contract Revenues We enter into out-licensing agreements under which we license certain rights to our products or product candidates to third parties. If a licensing arrangement includes multiple goods or services, we consider whether the license is distinct. If the license to our intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, we recognize revenue from non-refundable, upfront fees allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. If the license to our intellectual property is determined not to be distinct, it is combined with other goods or services into a combined performance obligation. We consider whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. We evaluate the measure of progress each reporting date and, if necessary, adjust the measure of performance and related revenue recognition. At the inception of each arrangement that includes development milestone payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within our control or that of the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is allocated to each performance obligation on a relative stand-alone selling price basis, for which we recognize revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, we re-evaluate the probability of achievement of such development milestones and any related constraint, and if necessary, adjust our estimate of the overall transaction price. For arrangements that include sales-based royalties and milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties and sales-based milestones relate, we recognize revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty or sales-based milestone has been allocated has been satisfied (or partially satisfied).
Significant Risks and Uncertainties	Significant Risks and Uncertainties Our financial results are significantly influenced by sales of Xyrem. Our ability to maintain or increase Xyrem product sales is subject to a number of risks and uncertainties, including, without limitation, the potential U.S. introduction of a generic version of Xyrem before the entry dates specified in our settlements with the abbreviated new drug application, or ANDA, filers, or on terms that are different from those contemplated by the settlement agreements; the potential U.S. introduction of new products that compete with, or otherwise disrupt the market for, Xyrem in the treatment of cataplexy and/or excessive daytime sleepiness in narcolepsy; changes to or uncertainties around regulatory restrictions, including, among other things, changes to our Xyrem risk evaluation and mitigation strategy, or REMS; any increase in pricing pressure from, changes in policies by, or restrictions on reimbursement imposed by, third party payors; changes in healthcare laws and policy, including changes in requirements for patient assistance programs, rebates, reimbursement and coverage by federal healthcare programs, and changes resulting from increased scrutiny on pharmaceutical pricing and REMS programs by government entities; operational disruptions at the Xyrem central pharmacy or any failure to comply with our REMS obligations to the satisfaction of the FDA; and continued acceptance of Xyrem by physicians and patients. In addition to risks related specifically to Xyrem, we are subject to other challenges and risks specific to our business and our ability to execute on our strategy, as well as risks and uncertainties common to companies in the pharmaceutical industry with development and commercial operations, including, without limitation, risks and uncertainties associated with: effectively commercializing our other products and product candidates; pharmaceutical product development and the inherent uncertainty of clinical success; the regulatory approval process; the challenges of protecting and enhancing our intellectual property rights; our dependence on sole source suppliers for most of our products, including delays or problems in the supply or manufacture of our products and product candidates; competition; complying with applicable regulatory requirements; changes in healthcare laws and policy and related reforms; government investigations and other actions; obtaining and maintaining appropriate pricing and reimbursement for our products; business combination or product or product candidate acquisition transactions; and possible restrictions on our ability and flexibility to pursue certain future opportunities as a result of our substantial outstanding debt obligations.
Concentrations of Risk	Concentrations of Risk Financial instruments that potentially subject us to concentrations of credit risk consist of cash, cash equivalents, investments and derivative contracts. Our investment policy permits investments in U.S. federal government and federal agency securities, corporate bonds or commercial paper issued by U.S. corporations, money market instruments, certain qualifying money market mutual funds, certain repurchase agreements, and tax-exempt obligations of U.S. states, agencies and municipalities and places restrictions on credit ratings, maturities, and concentration by type and issuer. We are exposed to credit risk in the event of a default by the financial institutions holding our cash, cash equivalents and investments to the extent recorded on the balance sheet. We manage our foreign currency transaction risk and interest rate risk within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes. As of September 30, 2018, we had foreign exchange forward contracts with notional amounts totaling $210.1 million. As of September 30, 2018, the net liability fair value of outstanding foreign exchange forward contracts was $1.0 million. As of September 30, 2018, we had interest rate swap contracts with notional amounts totaling $300.0 million. These outstanding interest rate swap contracts had a fair value of $7.8 million as of September 30, 2018. The counterparties to these contracts are large multinational commercial banks, and we believe the risk of nonperformance is not significant. We are also subject to credit risk from our accounts receivable related to our product sales. We monitor our exposure within accounts receivable and record a reserve against uncollectible accounts receivable as necessary. We extend credit to pharmaceutical wholesale distributors and specialty pharmaceutical distribution companies, primarily in the U.S., and to other international distributors and hospitals. Customer creditworthiness is monitored and collateral is not required. We monitor deteriorating economic conditions in certain European countries which may result in variability of the timing of cash receipts and an increase in the average length of time that it takes to collect accounts receivable outstanding.

The Company and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The cumulative effect of the changes made to our consolidated balance sheet as of January 1, 2018 for the adoption of the above accounting standards was as follows (in thousands):



	Balance at December 31, 2017			Transition Adjustments			Balance at January 1, 2018
Assets:
Deferred tax assets, net	$	34,559		$	595		$	35,154
Liabilities:
Deferred revenue	8,618			(1,120		)	7,498
Deferred revenue, non-current	16,115			(1,120		)	14,995
Deferred tax liabilities, net	383,472			3,133			386,605
Shareholders' Equity:
Accumulated other comprehensive loss	(140,878		)	53			(140,825		)
Retained earnings	917,956			(351		)	917,605

Cash and Available-for-Sale Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Cash and Cash Equivalents and Investments

Cash, cash equivalents and investments consisted of the following (in thousands):



	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Cash and Cash Equivalents		Investments
Cash	$	281,047	$	—	$	—	$	281,047	$	281,047	$	—
Time deposits	590,000		—		—		590,000		25,000		565,000
Money market funds	192,971		—		—		192,971		192,971		—
Totals	$	1,064,018	$	—	$	—	$	1,064,018	$	499,018	$	565,000



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Cash and Cash Equivalents		Investments
Cash	$	225,235	$	—	$	—	$	225,235	$	225,235	$	—
Time deposits	235,000		—		—		235,000		20,000		215,000
Money market funds	140,800		—		—		140,800		140,800		—
Totals	$	601,035	$	—	$	—	$	601,035	$	386,035	$	215,000

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis



	September 30, 2018						December 31, 2017
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total Estimated Fair Value
Assets:
Available-for-sale securities:
Time deposits	$	—	$	590,000	$	590,000	$	—	$	235,000	$	235,000
Money market funds	192,971		—		192,971		140,800		—		140,800
Interest rate contracts	—		7,824		7,824		—		2,138		2,138
Foreign exchange forward contracts	—		261		261		—		15,495		15,495
Totals	$	192,971	$	598,085	$	791,056	$	140,800	$	252,633	$	393,433
Liabilities:
Interest rate contracts	$	—	$	—	$	—	$	—	$	392	$	392
Foreign exchange forward contracts	—		1,258		1,258		—		5,017		5,017
Totals	$	—	$	1,258	$	1,258	$	—	$	5,409	$	5,409

Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of gains (losses) on derivative instruments

The impact on accumulated other comprehensive loss and earnings from derivative instruments that qualified as cash flow hedges for the three and nine months ended September 30, 2018 and 2017 was as follows (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
Interest Rate Contracts:	2018			2017			2018		2017
Gain (loss) recognized in accumulated other comprehensive loss, net of tax	$	876		$	(59	)	$	5,285	$	(2,234	)
Loss (gain) reclassified from accumulated other comprehensive loss to interest expense, net of tax	(130		)	451			19		1,278

Schedule of the fair value of outstanding derivatives

The following tables summarize the fair value of outstanding derivatives (in thousands):



	September 30, 2018
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Interest rate contracts	Other current assets	$	2,150	Accrued liabilities	$	—
	Other non-current assets	5,674
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets	261		Accrued liabilities	1,258
Total fair value of derivative instruments		$	8,085		$	1,258



	December 31, 2017
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Interest rate contracts	Other non-current assets	$	2,138	Accrued liabilities	$	392
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Other current assets	15,495		Accrued liabilities	5,017
Total fair value of derivative instruments		$	17,633		$	5,409

Schedule of offsetting assets

The following tables summarize the potential effect on our condensed consolidated balance sheets of offsetting our interest rate contracts and foreign exchange forward contracts subject to such provisions (in thousands):



	September 30, 2018
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,957		$	—	$	1,957		$	(457	)	$	—	$	1,500
Derivative liabilities	(457		)	—		(457		)	457			—		—



	December 31, 2017
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,639		$	—	$	1,639		$	(875	)	$	—	$	764
Derivative liabilities	(875		)	—		(875		)	875			—		—

Schedule of offsetting liabilities



	September 30, 2018
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,957		$	—	$	1,957		$	(457	)	$	—	$	1,500
Derivative liabilities	(457		)	—		(457		)	457			—		—



	December 31, 2017
	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet			Gross Amounts Not Offset in the Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/ Liabilities			Gross Amounts Offset in the Consolidated Balance Sheet					Derivative Financial Instruments			Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	1,639		$	—	$	1,639		$	(875	)	$	—	$	764
Derivative liabilities	(875		)	—		(875		)	875			—		—

Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Components of Inventories

Inventories consisted of the following (in thousands):



	September 30, 2018		December 31, 2017
Raw materials	$	2,482	$	3,542
Work in process	24,456		15,692
Finished goods	16,497		24,011
Total inventories	$	43,435	$	43,245

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Gross Carrying Amount of Goodwill

The gross carrying amount of goodwill was as follows (in thousands):



Balance at December 31, 2017	$	947,537
Foreign exchange	(15,115		)
Balance at September 30, 2018	$	932,422

Gross Carrying Amounts and Net Book Values of Intangible Assets

The gross carrying amounts and net book values of our intangible assets were as follows (in thousands):



	September 30, 2018								December 31, 2017
	Remaining Weighted- Average Useful Life (In years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Acquired developed technologies	14.6	$	3,122,811	$	(590,198	)	$	2,532,613	$	3,392,832	$	(562,473	)	$	2,830,359
Priority review voucher		111,100		—			111,100		—		—			—
Manufacturing contracts	—	12,391		(12,391		)	—		12,824		(12,634		)	190
Trademarks	—	2,899		(2,899		)	—		2,910		(2,910		)	—
Total finite-lived intangible assets		3,249,201		(605,488		)	2,643,713		3,408,566		(578,017		)	2,830,549
Acquired IPR&D assets		143,568		—			143,568		148,578		—			148,578
Total intangible assets		$	3,392,769	$	(605,488	)	$	2,787,281	$	3,557,144	$	(578,017	)	$	2,979,127

Estimated Future Amortization Costs



Year Ending December 31,	Estimated Amortization Expense
2018 (remainder)	$	46,802
2019	187,208
2020	185,969
2021	184,955
2022	184,246
Thereafter	1,743,433
Total	$	2,532,613

Certain Balance Sheet Items (Tables)

9 Months Ended

Sep. 30, 2018

Certain Balance Sheet Items [Abstract]

Property and Equipment

Property, plant and equipment consisted of the following (in thousands):



	September 30, 2018			December 31, 2017
Build-to-suit facility	$	52,222		$	51,721
Land and buildings	46,815			46,729
Construction-in-progress	46,058			21,738
Leasehold improvements	32,623			28,779
Manufacturing equipment and machinery	25,573			23,586
Computer software	19,135			19,969
Computer equipment	14,059			12,814
Furniture and fixtures	8,059			5,947
Subtotal	244,544			211,283
Less accumulated depreciation and amortization	(46,491		)	(41,203		)
Property, plant and equipment, net	$	198,053		$	170,080

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):



	September 30, 2018		December 31, 2017
Rebates and other sales deductions	$	88,443	$	81,368
Estimated loss contingency	57,753		—
Employee compensation and benefits	49,845		54,930
Clinical trial accruals	8,387		2,181
Selling and marketing accruals	5,837		3,189
Inventory-related accruals	3,290		3,002
Royalties	3,293		8,058
Accrued interest	2,678		7,297
Sales returns reserve	2,473		3,651
Professional fees	2,368		3,213
Derivative instrument liabilities	1,258		5,409
Other	31,828		26,481
Total accrued liabilities	$	257,453	$	198,779

Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

The following table summarizes the carrying amount of our indebtedness (in thousands):



	September 30, 2018			December 31, 2017
2021 Notes	$	575,000		$	575,000
Unamortized discount and debt issuance costs on 2021 Notes	(66,269		)	(81,627		)
2021 Notes, net	508,731			493,373

2024 Notes	575,000			575,000
Unamortized discount and debt issuance costs on 2024 Notes	(144,018		)	(158,680		)
2024 Notes, net	430,982			416,320

Term loan	654,256			671,345
Total debt	1,593,969			1,581,038
Less current portion	33,387			40,605
Total long-term debt	$	1,560,582		$	1,540,433

Schedule of Maturities of Long-term Debt

Scheduled maturities with respect to our long-term debt principal balances outstanding as of September 30, 2018 were as follows (in thousands):



Year Ending December 31,	Scheduled Long-Term Debt Maturities
2018 (remainder)	$	8,346
2019	33,387
2020	33,387
2021	608,387
2022	33,387
Thereafter	1,092,494
Total	$	1,809,388

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Subparagraph (SX 210.4-08.(e),(f))
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity Note [Abstract]

Reconciliation of Shareholders' Equity

The following tables present a reconciliation of our beginning and ending balances in shareholders’ equity for the nine months ended September 30, 2018 and 2017 (in thousands):



	Total Shareholders' Equity
Shareholders' equity at January 1, 2018	$	2,713,097
Effect of adoption of new accounting standards	(298		)
Issuance of ordinary shares in conjunction with employee equity incentive and purchase plans	84,056
Employee withholding taxes related to share-based awards	(17,192		)
Share-based compensation	75,682
Shares repurchased	(77,015		)
Other comprehensive loss	(38,641		)
Net income	287,628
Shareholders' equity at September 30, 2018	$	3,027,317



	Total Shareholders' Equity
Shareholders' equity at January 1, 2017	$	1,877,339
Issuance of 2024 Notes	149,767
Issuance of ordinary shares in conjunction with employee equity incentive and purchase plans	22,793
Employee withholding taxes related to share-based awards	(17,909		)
Share-based compensation	79,745
Shares repurchased	(56,425		)
Other comprehensive income	158,346
Net income	255,641
Shareholders' equity at September 30, 2017	$	2,469,297

Components of Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss as of September 30, 2018 and December 31, 2017 were as follows (in thousands):



	Net Unrealized Gain From Hedging Activities		Foreign Currency Translation Adjustments			Total Accumulated Other Comprehensive Loss
Balance at December 31, 2017	$	1,482	$	(142,360	)	$	(140,878	)
Effect of adoption of ASU No. 2017-12	53		—			53
Balance at January 1, 2018	1,535		(142,360		)	(140,825		)
Other comprehensive income (loss) before reclassifications	5,285		(43,945		)	(38,660		)
Amounts reclassified from accumulated other comprehensive loss	19		—			19
Other comprehensive income (loss), net	5,304		(43,945		)	(38,641		)
Balance at September 30, 2018	$	6,839	$	(186,305	)	$	(179,466	)

Net Income per Ordinary Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Basic and Diluted Net Income per Ordinary Share Computation

Basic and diluted net income per ordinary share were computed as follows (in thousands, except per share amounts):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Numerator:
Net income	$	149,316	$	63,526	$	287,628	$	255,641
Denominator:
Weighted-average ordinary shares used in per share calculations - basic	60,476		60,108		60,196		60,030
Dilutive effect of employee equity incentive and purchase plans	1,381		1,328		1,297		1,330
Weighted-average ordinary shares used in per share calculations - diluted	61,857		61,436		61,493		61,360

Net income per ordinary share:
Basic	$	2.47	$	1.06	$	4.78	$	4.26
Diluted	$	2.41	$	1.03	$	4.68	$	4.17

Weighted-Average Ordinary Shares Excluded from Computation of Diluted Net Income per Share



	Three Months Ended September 30,		Nine Months Ended September 30,
	2018	2017	2018	2017
Exchangeable Senior Notes	5,504	3,958	5,504	3,238
Options to purchase ordinary shares and RSUs	2,230	2,998	2,959	3,175
Ordinary shares under ESPP	14	16	16	9

Revenues (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Summary of disaggregation of revenue

The following table presents a summary of total revenues (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Xyrem	$	357,251	$	303,870	$	1,030,036	$	874,222
Erwinaze/Erwinase	41,134		49,173		150,474		149,585
Defitelio/defibrotide	36,177		31,213		111,736		97,351
Vyxeos	21,038		9,719		75,217		9,719
Prialt	5,792		7,930		20,839		21,303
Other	3,805		6,066		13,837		19,124
Product sales, net	465,197		407,971		1,402,139		1,171,304
Royalties and contract revenues	4,176		3,884		12,326		10,990
Total revenues	$	469,373	$	411,855	$	1,414,465	$	1,182,294

The following table presents a summary of total revenues attributed to geographic sources (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
United States	$	429,729	$	372,846	$	1,290,775	$	1,068,716
Europe	30,816		30,297		94,165		89,027
All other	8,828		8,712		29,525		24,551
Total revenues	$	469,373	$	411,855	$	1,414,465	$	1,182,294

Summary of Revenues from Customers Representing More Than 10% of Total Revenues

The following table presents a summary of the percentage of total revenues from customers that represented more than 10% of our total revenues:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Express Scripts	76	%	74	%	73	%	74	%
McKesson	15	%	14	%	18	%	14	%

Summary of a reconciliation in contract liabilities from contracts with customer

The following table presents a reconciliation of our beginning and ending balances in contract liabilities from contracts with customers for the nine months ended September 30, 2018 (in thousands):



	Contract Liabilities
Balance as of December 31, 2017	$	24,733
Effect of adoption of ASU 2014-09	(2,240		)
Amount recognized within royalties and contract revenues	(5,624		)
Balance as of September 30, 2018	$	16,869

Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Expense Related to Share Options, RSUs and Grants Under ESPP

Share-based compensation expense related to share options, RSUs and grants under our ESPP was as follows (in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Selling, general and administrative	$	18,978		$	20,903		$	57,012		$	61,582
Research and development	4,600			4,650			13,684			13,651
Cost of product sales	1,525			1,573			5,022			4,346
Total share-based compensation expense, pre-tax	25,103			27,126			75,718			79,579
Income tax benefit from share-based compensation expense	(3,552		)	(6,354		)	(12,066		)	(23,816		)
Total share-based compensation expense, net of tax	$	21,551		$	20,772		$	63,652		$	55,763

Weighted-Average Assumptions Used in Black-Scholes Option Pricing Model which was Used to Estimate Grant Date Fair Value per Share



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Shares underlying options granted (in thousands)	117			87			1,349			1,343
Grant date fair value	$	53.93		$	45.87		$	46.95		$	42.69
Black-Scholes option pricing model assumption information:
Volatility	32		%	35		%	35		%	35		%
Expected term (years)	4.5			4.3			4.5			4.3
Range of risk-free rates	2.7-2.8%			1.6-1.8%			2.2-2.8%			1.6-1.8%
Expected dividend yield	—		%	—		%	—		%	—		%

Schedule of Restricted Stock Unit activity

The table below shows the number of RSUs granted covering an equal number of our ordinary shares and the weighted-average grant date fair value of RSUs granted:



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
RSUs granted (in thousands)	71		35		564		537
Grant date fair value	$	174.73	$	148.60	$	145.59	$	137.23

The Company and Summary of Significant Accounting Policies - Basis of Presentation Additional Information (Details)	9 Months Ended
	Sep. 30, 2018 Segment
Accounting Policies [Abstract]
Number of operating business segment	1

The Company and Summary of Significant Accounting Policies - Cumulative Effect on the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
ASSETS
Deferred tax assets, net	$ 37,582	$ 35,154	$ 34,559
Liabilities:
Deferred revenue	5,935	7,498	8,618
Deferred revenue, non-current	10,934	14,995	16,115
Deferred tax liabilities, net	337,021	386,605	383,472
Shareholders’ equity:
Accumulated other comprehensive loss	(179,466)	(140,825)	(140,878)
Retained earnings	$ 1,128,218	917,605	917,956
Previously Reported
ASSETS
Deferred tax assets, net			34,559
Liabilities:
Deferred revenue			8,618
Deferred revenue, non-current			16,115
Deferred tax liabilities, net			383,472
Shareholders’ equity:
Accumulated other comprehensive loss			(140,878)
Retained earnings			$ 917,956
Transition Adjustments
ASSETS
Deferred tax assets, net		595
Liabilities:
Deferred revenue		(1,120)
Deferred revenue, non-current		(1,120)
Deferred tax liabilities, net		3,133
Shareholders’ equity:
Accumulated other comprehensive loss		53
Retained earnings		$ (351)

The Company and Summary of Significant Accounting Policies - Concentrations of Risk Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Customer concentration risk \| Gross accounts receivable
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	91.00%	86.00%
Customer concentration risk \| Gross accounts receivable \| Express Scripts
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	77.00%	71.00%
Customer concentration risk \| Gross accounts receivable \| McKesson
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	14.00%	15.00%
Foreign exchange forward contracts \| Derivatives not designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	$ 210,100,000		$ 98,700,000
Net fair value	(1,000,000)
Interest rate contracts \| Derivatives designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	300,000,000		$ 300,000,000
Net fair value	$ 7,800,000

The Company and Summary of Significant Accounting Policies - Recent Accounting Pronouncements Additional Information (Details) $ in Millions	Sep. 30, 2018 USD ($)
Building \| Palo Alto And Dublin
Operating Leased Assets [Line Items]
Future minimum lease payments	$ 208.6

Disposition - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 27, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 29, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of assets						$ 48,092	$ 0
Impairment charges				$ 0	$ 0	42,896	0
Loss on disposition						652	$ 360
Prialt Asset Sale \| Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total purchase price of assets held for sale								$ 80,000
Proceeds from sale of assets before legal and other expenses			$ 50,000
Impairment charges						42,900
Loss on disposition				$ 500		$ 500
Prialt Asset Sale \| Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations \| Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of assets	$ 15,000	$ 15,000

Cash and Available-for-Sale Securities - Summary of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,064,018	$ 601,035
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,064,018	601,035
Cash and cash equivalents	499,018	386,035	$ 252,615	$ 365,963
Investments	565,000	215,000
Cash
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	281,047	225,235
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	281,047	225,235
Cash and cash equivalents	281,047	225,235
Investments	0	0
Time deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	590,000	235,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	590,000	235,000
Cash and cash equivalents	25,000	20,000
Investments	565,000	215,000
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	192,971	140,800
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	192,971	140,800
Cash and cash equivalents	192,971	140,800
Investments	$ 0	$ 0

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale securities:
Available-for-sale securities	$ 1,064,018	$ 601,035
Time deposits
Available-for-sale securities:
Available-for-sale securities	590,000	235,000
Money market funds
Available-for-sale securities:
Available-for-sale securities	192,971	140,800
Recurring \| Total Estimated Fair Value
Available-for-sale securities:
Totals	791,056	393,433
Liabilities:
Totals	1,258	5,409
Recurring \| Total Estimated Fair Value \| Interest rate contracts
Available-for-sale securities:
Derivative asset	7,824	2,138
Liabilities:
Derivative liabilities	0	392
Recurring \| Total Estimated Fair Value \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	261	15,495
Liabilities:
Derivative liabilities	1,258	5,017
Recurring \| Total Estimated Fair Value \| Time deposits
Available-for-sale securities:
Available-for-sale securities	590,000	235,000
Recurring \| Total Estimated Fair Value \| Money market funds
Available-for-sale securities:
Available-for-sale securities	192,971	140,800
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale securities:
Totals	192,971	140,800
Liabilities:
Totals	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Interest rate contracts
Available-for-sale securities:
Derivative asset	0	0
Liabilities:
Derivative liabilities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	0	0
Liabilities:
Derivative liabilities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Time deposits
Available-for-sale securities:
Available-for-sale securities	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Available-for-sale securities:
Available-for-sale securities	192,971	140,800
Recurring \| Significant Other Observable Inputs (Level 2)
Available-for-sale securities:
Totals	598,085	252,633
Liabilities:
Totals	1,258	5,409
Recurring \| Significant Other Observable Inputs (Level 2) \| Interest rate contracts
Available-for-sale securities:
Derivative asset	7,824	2,138
Liabilities:
Derivative liabilities	0	392
Recurring \| Significant Other Observable Inputs (Level 2) \| Foreign exchange forward contracts
Available-for-sale securities:
Derivative asset	261	15,495
Liabilities:
Derivative liabilities	1,258	5,017
Recurring \| Significant Other Observable Inputs (Level 2) \| Time deposits
Available-for-sale securities:
Available-for-sale securities	590,000	235,000
Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Available-for-sale securities:
Available-for-sale securities	$ 0	$ 0

Fair Value Measurement - Additional Information (Details) - Convertible Debt $ in Millions	Sep. 30, 2018 USD ($)
2021 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	1.875%
2024 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	1.50%
Significant Other Observable Inputs (Level 2) \| 2021 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of exchangeable senior notes	$ 619
Significant Other Observable Inputs (Level 2) \| 2024 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of exchangeable senior notes	$ 586

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Gains recognized in AOCI to be reclassified over the next 12 months			$ 1,900,000
Interest rate contracts \| Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 300,000,000		$ 300,000,000		$ 300,000,000
Interest rate contracts \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Fixed interest rate	1.895%		1.895%
Foreign exchange forward contracts \| Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 210,100,000		$ 210,100,000		$ 98,700,000
Losses recognized in other income and expense	$ 2,400,000		$ 10,900,000
Gain recognized in other income and expense		$ 8,000,000		$ 19,600,000
Foreign exchange forward contracts \| Derivatives not designated as hedging instruments \| Maximum
Derivative [Line Items]
Contract term			12 months

Derivative Instruments and Hedging Activities - Gains on Derivative Instruments (Details) - Interest rate contracts - Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in accumulated other comprehensive loss, net of tax	$ 876	$ (59)	$ 5,285	$ (2,234)
Loss (gain) reclassified from accumulated other comprehensive loss to interest expense, net of tax	$ (130)	$ 451	$ 19	$ 1,278

Derivative Instruments and Hedging Activities - Fair Value of Outstanding Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 8,085	$ 17,633
Liability Derivatives	1,258	5,409
Derivatives designated as hedging instruments \| Interest rate contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2,150
Derivatives designated as hedging instruments \| Interest rate contracts \| Other non-current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	5,674	2,138
Derivatives designated as hedging instruments \| Interest rate contracts \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	392
Derivatives not designated as hedging instruments \| Foreign exchange forward contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	261	15,495
Derivatives not designated as hedging instruments \| Foreign exchange forward contracts \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1,258	$ 5,017

Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities (Details) - Pro Forma - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivative assets
Gross Amounts of Recognized Assets/ Liabilities	$ 1,957	$ 1,639
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet	1,957	1,639
Gross Amounts Not Offset in the Consolidated Balance Sheet
Derivative Financial Instruments	(457)	(875)
Cash Collateral Received (Pledged)	0	0
Net Amount	1,500	764
Derivative liabilities
Gross Amounts of Recognized Assets/ Liabilities	(457)	(875)
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet	(457)	(875)
Gross Amounts Not Offset in the Consolidated Balance Sheet
Derivative Financial Instruments	457	875
Cash Collateral Received (Pledged)	0	0
Net Amount	$ 0	$ 0

Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 2,482	$ 3,542
Work in process	24,456	15,692
Finished goods	16,497	24,011
Total inventories	$ 43,435	$ 43,245

Goodwill and Intangible Assets - Goodwill Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 947,537
Foreign exchange	(15,115)
Goodwill, end of period	$ 932,422

Goodwill and Intangible Assets - Gross Carrying Amounts and Net Book Values of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,249,201	$ 3,408,566
Accumulated Amortization	(605,488)	(578,017)
Total	2,643,713	2,830,549
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount - Total Intangible Assets	3,392,769	3,557,144
Net Book Value - Total Intangible Assets	2,787,281	2,979,127
Acquired IPR&D assets
Indefinite-lived Intangible Assets [Line Items]
In-process research and development	$ 143,568	148,578
Acquired developed technologies
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	14 years 7 months
Gross Carrying Amount	$ 3,122,811	3,392,832
Accumulated Amortization	(590,198)	(562,473)
Total	2,532,613	2,830,359
Priority review voucher
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	111,100	0
Accumulated Amortization	0	0
Total	$ 111,100	0
Manufacturing contracts
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	0 years
Gross Carrying Amount	$ 12,391	12,824
Accumulated Amortization	(12,391)	(12,634)
Total	$ 0	190
Trademarks
Finite-Lived Intangible Assets [Line Items]
Remaining Weighted- Average Useful Life (In years)	0 years
Gross Carrying Amount	$ 2,899	2,910
Accumulated Amortization	(2,899)	(2,910)
Total	$ 0	$ 0

Goodwill and Intangible Assets - Estimated Future Amortization Costs (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Estimated Amortization Expense
Total	$ 2,643,713	$ 2,830,549
Acquired developed technologies
Estimated Amortization Expense
2018 (remainder)	46,802
2019	187,208
2020	185,969
2021	184,955
2022	184,246
Thereafter	1,743,433
Total	$ 2,532,613	$ 2,830,359

Certain Balance Sheet Items - Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 244,544	$ 211,283
Less accumulated depreciation and amortization	(46,491)	(41,203)
Property, plant and equipment, net	198,053	170,080
Build-to-suit facility
Property, Plant and Equipment [Line Items]
Property and equipment, gross	52,222	51,721
Land and buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	46,815	46,729
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	46,058	21,738
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,623	28,779
Manufacturing equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,573	23,586
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,135	19,969
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,059	12,814
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,059	$ 5,947

Certain Balance Sheet Items - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Certain Balance Sheet Items [Abstract]
Rebates and other sales deductions	$ 88,443	$ 81,368
Estimated loss contingency	57,753	0
Employee compensation and benefits	49,845	54,930
Clinical trial accruals	8,387	2,181
Selling and marketing accruals	5,837	3,189
Inventory-related accruals	3,290	3,002
Royalties	3,293	8,058
Accrued interest	2,678	7,297
Sales returns reserve	2,473	3,651
Professional fees	2,368	3,213
Derivative instrument liabilities	1,258	5,409
Other	31,828	26,481
Total accrued liabilities	$ 257,453	$ 198,779

Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt outstanding	$ 1,809,388
Total debt	1,593,969	$ 1,581,038
Less current portion	33,387	40,605
Total long-term debt	1,560,582	1,540,433
Convertible Debt \| 2021 Notes
Debt Instrument [Line Items]
Long term debt outstanding	575,000	575,000
Unamortized discount and debt issuance costs	(66,269)	(81,627)
Total debt	508,731	493,373
Convertible Debt \| 2024 Notes
Debt Instrument [Line Items]
Long term debt outstanding	575,000	575,000
Unamortized discount and debt issuance costs	(144,018)	(158,680)
Total debt	430,982	416,320
Term Loan
Debt Instrument [Line Items]
Total debt	$ 654,256	$ 671,345

Debt - Additional Information (Details) - USD ($)	Jun. 07, 2018	Jul. 12, 2016	Jun. 18, 2015	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt outstanding				$ 1,809,388,000
Revolving Credit Facility \| Credit Agreement June 2015
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity			$ 750,000,000
Proceeds from revolving credit facility			160,000,000
Revolving Credit Facility \| Credit Agreement June 2015 Amendment
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 1,600,000,000	$ 1,250,000,000
Proceeds from revolving credit facility		1,000,000,000
Revolving Credit Facility \| Credit Agreement June 2015 Amendment \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.25%
Revolving Credit Facility \| Credit Agreement June 2015 Amendment \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.35%
Term Loan \| Credit Agreement June 2015
Debt Instrument [Line Items]
Face amount	$ 667,734,000	$ 750,000,000	750,000,000
Long term debt outstanding	$ 667,700,000
Percentage of principal repayment	5.00%
Term Loan \| Credit Agreement 2012
Debt Instrument [Line Items]
Extinguishment of debt			$ 893,100,000
Term Loan \| Credit Agreement June 2015 Amendment
Debt Instrument [Line Items]
Long term debt outstanding				659,400,000
Term Loan \| Credit Agreement June 2015 Amendment \| LIBOR \| Minimum
Debt Instrument [Line Items]
Variable interest rate	1.375%
Term Loan \| Credit Agreement June 2015 Amendment \| LIBOR \| Maximum
Debt Instrument [Line Items]
Variable interest rate	1.75%
Term Loan \| Credit Agreement June 2015 Amendment \| Prime Rate \| Minimum
Debt Instrument [Line Items]
Variable interest rate	0.375%
Term Loan \| Credit Agreement June 2015 Amendment \| Prime Rate \| Maximum
Debt Instrument [Line Items]
Variable interest rate	0.75%
Convertible Debt \| 2021 Notes
Debt Instrument [Line Items]
Long term debt outstanding				575,000,000	$ 575,000,000
Carrying value of the equity component				126,900,000
Convertible Debt \| 2024 Notes
Debt Instrument [Line Items]
Long term debt outstanding				575,000,000	$ 575,000,000
Carrying value of the equity component				$ 149,800,000
Jazz Investments I Limited \| Convertible Debt
Debt Instrument [Line Items]
Percentage of ownership (as a percent)				100.00%

Debt - Schedule of Maturities of Long-term Debt (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Debt Disclosure [Abstract]
2018 (remainder)	$ 8,346
2019	33,387
2020	33,387
2021	608,387
2022	33,387
Thereafter	1,092,494
Total	$ 1,809,388

Commitments and Contingencies - Lease and Other Commitments (Details) $ in Thousands	1 Months Ended
	Sep. 30, 2017 renewal_term	Jan. 31, 2015 renewal_term	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items]
Other non-current liabilities			$ 208,647	$ 176,608
Noncancelable purchase commitments, due within one year			54,700
Building \| Palo Alto
Operating Leased Assets [Line Items]
Operating lease, term	12 years	12 years
Financing obligation			62,900
Building \| Palo Alto \| Property and Equipment, Net
Operating Leased Assets [Line Items]
Construction-in-progress			43,700
Building \| Palo Alto \| Other Non-Current Liabilities
Operating Leased Assets [Line Items]
Other non-current liabilities			$ 62,900
Building \| Palo Alto \| Lease Agreements
Operating Leased Assets [Line Items]
Number of renewal option terms \| renewal_term	2	2
Operating lease, extended term option	5 years	5 years

Commitments and Contingencies - Legal Proceedings and Other Contingencies (Details) $ in Millions	1 Months Ended				9 Months Ended
	Apr. 30, 2018 USD ($)	Mar. 31, 2017 claim_under_petition	Jul. 31, 2016 patent	Jan. 31, 2015 patent	Sep. 30, 2018 USD ($) lawsuit
Xyrem
Commitments and Contingencies Disclosure [Line Items]
Loss contingency claims previously settled number \| lawsuit					8
Number of claims settled \| lawsuit					9
Pending Litigation \| Xyrem
Commitments and Contingencies Disclosure [Line Items]
Number of patents named in review petitions				6
Number of Xyrem REMS patents				7
Number of patents deemed unenforceable by PTAB			6
Number of petition claims under patent review deemed unpatentable \| claim_under_petition		3
DOJ Investigation
Commitments and Contingencies Disclosure [Line Items]
Proposed settlement amount \| $	$ 57.0
Estimated loss contingency \| $					$ 57.8
West-Ward \| West-Ward Product AG
Commitments and Contingencies Disclosure [Line Items]
Period West-Ward has option to sell West-Ward AG Product					5 years
Earliest time frame West-Ward licensed to launch generic product after right to sell AG Product					6 months

Shareholders' Equity - Equity Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 2,713,097	$ 1,877,339
Effect of adoption of new accounting standards					$ (298)
Issuance of 2024 Notes				149,767
Issuance of ordinary shares in conjunction with employee equity incentive and purchase plans			84,056	22,793
Employee withholding taxes related to share-based awards			(17,192)	(17,909)
Share-based compensation			75,682	79,745
Shares repurchased			(77,015)	(56,425)
Other comprehensive income (loss)	$ (11,238)	$ 51,262	(38,641)	158,346
Net income	149,316	63,526	287,628	255,641
Ending balance	$ 3,027,317	$ 2,469,297	$ 3,027,317	$ 2,469,297

Shareholders' Equity - Share Repurchase Programs (Details) - USD ($) $ / shares in Units, shares in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Nov. 06, 2018	Nov. 30, 2016
Stock Activity [Line Items]
Shares repurchased	$ 77,015,000	$ 56,425,000
Ordinary Options
Stock Activity [Line Items]
Shares repurchased	$ 77,000,000
Shares repurchased (in shares)	0.5
Average price of shares repurchased (in dollars per share)	$ 154.03
Ordinary Options \| November 2016 Share Repurchase Program
Stock Activity [Line Items]
Total amount authorized for repurchase of shares under share repurchase program				$ 300,000,000
Remaining amount authorized for repurchase of shares	$ 105,700,000
Subsequent Event \| Ordinary Options \| November 2016 Share Repurchase Program
Stock Activity [Line Items]
Total amount additionally authorized for repurchase of shares under share repurchase program			$ 320,000,000

Shareholders' Equity - Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 2,713,097	$ 1,877,339
Effect of adoption of new accounting standards					$ (298)
Other comprehensive income (loss) before reclassifications			(38,660)
Amounts reclassified from accumulated other comprehensive loss			19
Other comprehensive income (loss)	$ (11,238)	$ 51,262	(38,641)	158,346
Ending balance	3,027,317	$ 2,469,297	3,027,317	$ 2,469,297
Net Unrealized Gain From Hedging Activities
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			1,535
Other comprehensive income (loss) before reclassifications			5,285
Amounts reclassified from accumulated other comprehensive loss			19
Other comprehensive income (loss)			5,304
Ending balance	6,839		6,839
Net Unrealized Gain From Hedging Activities \| ASU No. 2017-12
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of adoption of new accounting standards					53
Foreign Currency Translation Adjustments
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(142,360)
Other comprehensive income (loss) before reclassifications			(43,945)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			(43,945)
Ending balance	(186,305)		(186,305)
Foreign Currency Translation Adjustments \| ASU No. 2017-12
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of adoption of new accounting standards					0
Total Accumulated Other Comprehensive Loss
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(140,825)
Ending balance	$ (179,466)		(179,466)
Total Accumulated Other Comprehensive Loss \| ASU No. 2017-12
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Effect of adoption of new accounting standards					$ 53
Previously Reported \| Net Unrealized Gain From Hedging Activities
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			1,482
Previously Reported \| Foreign Currency Translation Adjustments
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(142,360)
Previously Reported \| Total Accumulated Other Comprehensive Loss
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (140,878)

Net Income per Ordinary Share - Basic and Diluted Net Income (Loss) per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator [Abstract]
Net income	$ 149,316	$ 63,526	$ 287,628	$ 255,641
Denominator [Abstract]
Weighted-average ordinary shares used in per share calculation - basic (in shares)	60,476	60,108	60,196	60,030
Dilutive effect of employee equity incentive and purchase plans (in shares)	1,381	1,328	1,297	1,330
Weighted-average ordinary shares used in per share calculation - diluted (in shares)	61,857	61,436	61,493	61,360
Net Income Per Ordinary Share [Abstract]
Basic (in dollars per share)	$ 2.47	$ 1.06	$ 4.78	$ 4.26
Diluted (in dollars per share)	$ 2.41	$ 1.03	$ 4.68	$ 4.17

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Income per Ordinary Share - Weighted-Average Ordinary Shares Excluded from Computation of Diluted Net Income per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Exchangeable Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Ordinary shares (in shares)	5,504	3,958	5,504	3,238
Options to purchase ordinary shares and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Ordinary shares (in shares)	2,230	2,998	2,959	3,175
Ordinary shares under ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Ordinary shares (in shares)	14	16	16	9

Revenues - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues	$ 469,373	$ 411,855	$ 1,414,465	$ 1,182,294
United States
Disaggregation of Revenue [Line Items]
Total revenues	429,729	372,846	1,290,775	1,068,716
Europe
Disaggregation of Revenue [Line Items]
Total revenues	30,816	30,297	94,165	89,027
All other
Disaggregation of Revenue [Line Items]
Total revenues	8,828	8,712	29,525	24,551
Product sales, net
Disaggregation of Revenue [Line Items]
Total revenues	465,197	407,971	1,402,139	1,171,304
Xyrem
Disaggregation of Revenue [Line Items]
Total revenues	357,251	303,870	1,030,036	874,222
Erwinaze/Erwinase
Disaggregation of Revenue [Line Items]
Total revenues	41,134	49,173	150,474	149,585
Defitelio/defibrotide
Disaggregation of Revenue [Line Items]
Total revenues	36,177	31,213	111,736	97,351
Vyxeos
Disaggregation of Revenue [Line Items]
Total revenues	21,038	9,719	75,217	9,719
Prialt
Disaggregation of Revenue [Line Items]
Total revenues	5,792	7,930	20,839	21,303
Other
Disaggregation of Revenue [Line Items]
Total revenues	3,805	6,066	13,837	19,124
Royalties and contract revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 4,176	$ 3,884	$ 12,326	$ 10,990

Revenues - Summary of the Percentage of Total Revenues from Customers (Details) - Total Revenues - Customer concentration risk	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Express Scripts
Concentration Risk [Line Items]
Percentage of total revenues (as a percent)	76.00%	74.00%	73.00%	74.00%
McKesson
Concentration Risk [Line Items]
Percentage of total revenues (as a percent)	15.00%	14.00%	18.00%	14.00%

Revenues - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Revenues - Additional Information (Details) $ in Thousands	Sep. 30, 2018 USD ($) agreement	Sep. 30, 2018 USD ($) agreement
Summary Of Deferred Revenue [Line Items]
Contract revenue recognized		$ 5,624
Minimum
Summary Of Deferred Revenue [Line Items]
Payment terms, range		30 days
Maximum
Summary Of Deferred Revenue [Line Items]
Payment terms, range		45 days
Nippon Shinyaku
Summary Of Deferred Revenue [Line Items]
Number of license, development and commercialization agreements \| agreement	2	2
Contract revenue recognized	$ 1,900	$ 5,600
Revenue, performance obligation, description of timing		The deferred revenue balances are being recognized over an average of four years representing the period we expect to perform our research and developments obligations under each agreement.

Revenues - Summary of Contract Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 24,733
Effect of adoption of ASU 2014-09	(2,240)
Amount recognized within royalties and contract revenues	(5,624)
Ending balance	$ 16,869

Share-Based Compensation - Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense, pre-tax	$ 25,103	$ 27,126	$ 75,718	$ 79,579
Income tax benefit from share-based compensation expense	(3,552)	(6,354)	(12,066)	(23,816)
Total share-based compensation expense, net of tax	21,551	20,772	63,652	55,763
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense, pre-tax	18,978	20,903	57,012	61,582
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense, pre-tax	4,600	4,650	13,684	13,651
Cost of product sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense, pre-tax	$ 1,525	$ 1,573	$ 5,022	$ 4,346

Share-Based Compensation - Weighted-Average Assumptions and Resulting Grant Date Fair Value (Details) - Employee Stock Option - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Shares underlying options granted (in shares)	117	87	1,349	1,343
Weighted-average grant date fair value (in dollars per share)	$ 53.93	$ 45.87	$ 46.95	$ 42.69
Weighted-average volatility (as a percent)	32.00%	35.00%	35.00%	35.00%
Weighted-average expected term	4 years 6 months	4 years 3 months	4 years 6 months	4 years 3 months
Range of risk-free rates, minimum (as a percent)	2.70%	1.60%	2.20%	1.60%
Range of risk-free rates, maximum (as a percent)	2.80%	1.80%	2.80%	1.80%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%	0.00%

Share-Based Compensation - Restricted Units (Details) - Restricted Stock Units (RSUs) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted (in shares)	71	35	564	537
Grant date fair value (in dollars per share)	$ 174.73	$ 148.60	$ 145.59	$ 137.23

Share-Based Compensation - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Unrecognized compensation cost related to unvested stock option and RSUs	$ 102.7
Weighted-average period expected to be recognized	2 years 7 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock option and RSUs	$ 82.8
Weighted-average period expected to be recognized	2 years 8 months

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Line Items]
Income tax provision	$ 19,348	$ 1,239	$ 75,018	$ 65,914
Effective income tax rate (as a percent)	11.40%	1.90%	20.60%	20.50%
Provisional measurement period adjustment for foreign earnings repatriation	$ 2,900		$ 2,900
Ireland
Income Taxes [Line Items]
Ireland statutory income tax rate (as a percent)	12.50%		12.50%
France
Income Taxes [Line Items]
Proposed additional tax including interest and penalties			$ 43,000