Stockholders' Equity Statement of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)			49,323,418
Beginning Balance	$ 1,483,328	$ 1,783,034	$ 1,503,738	$ 1,815,314
Adoption of ASU No. 2016-16					$ (22,430)
Share issuances				0
Stock-based compensation plans	8,272	6,747	20,624	16,504
Net income (loss)	32,118	(7,177)	(11,946)	21,162
Other comprehensive income (loss)	$ (28,436)	2,388	$ (17,134)	(45,558)
Ending Balance (in shares)	49,380,570		49,380,570
Ending Balance	$ 1,495,282	$ 1,784,992	$ 1,495,282	$ 1,784,992
Ordinary Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	49,380,000	48,661,000	49,323,000	48,290,000
Beginning Balance	$ 76,217	$ 75,269	$ 76,144	$ 74,750
Share issuances (in shares)				300,000
Share issuances				$ 422
Stock-based compensation plans (in shares)	1,000	33,000	58,000	104,000
Stock-based compensation plans	$ 0	$ 42	$ 73	$ 139
Ending Balance (in shares)	49,381,000	48,694,000	49,381,000	48,694,000
Ending Balance	$ 76,217	$ 75,311	$ 76,217	$ 75,311
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,717,220	1,744,262	1,705,111	1,735,048
Stock-based compensation plans	8,262	6,624	20,371	15,838
Ending Balance	1,725,482	1,750,886	1,725,482	1,750,886
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,292)	(109)	(1,462)	(133)
Share issuances				(422)
Stock-based compensation plans	10	81	180	527
Ending Balance	(1,282)	(28)	(1,282)	(28)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(13,174)	(2,633)	(24,476)	45,313
Other comprehensive income (loss)	(28,436)		(17,134)	(45,558)
Ending Balance	(41,610)	(245)	(41,610)	(245)
Retained Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(295,643)	(33,755)	(251,579)	(39,664)
Adoption of ASU No. 2016-16					$ (22,430)
Net income (loss)	32,118	(7,177)	(11,946)	21,162
Ending Balance	$ (263,525)	$ (40,932)	$ (263,525)	$ (40,932)

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Number of new stock issued during the period.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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