Shareholders' Deficit (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	$ (714,867)	$ (737,817)	$ (866,544)	$ (590,472)	$ (494,450)	$ (498,283)	$ (866,544)	$ (498,283)
Net income (loss)	(75,887)	10,558	129,930	(79,415)	(106,005)	(18,573)	64,601	(203,993)
Other comprehensive income (loss)	2,755	5,624	(14,437)	(2,515)	4,395	4,730	(6,058)	6,610
Compensation related to share-based awards	6,585	9,222	17,645	11,576	12,600	24,733
Exercise of options				(650)	(7,013)	4
Tax withholding for restricted shares	(1,070)	(2,467)	(4,398)			(2,414)
Other	2	13	(13)	(1)	1	(1)
Shareholders' equity, ending balance	(782,482)	(714,867)	(737,817)	(661,477)	(590,472)	$ (494,450)	(782,482)	$ (661,477)
Accounting Standards Update [Extensible List]						us-gaap:AccountingStandardsUpdate201602Member		us-gaap:AccountingStandardsUpdate201602Member
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						$ (4,646)		$ (4,646)
Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						(502,929)		(502,929)
Euro Deferred Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	45	44	45	45	45	46	45	46
Other	2	1	(1)	(1)		(1)
Shareholders' equity, ending balance	47	45	44	44	45	45	47	44
Euro Deferred Shares | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						46		46
Ordinary Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	23	23	23	23	22	22	23	22
Other				0	1
Shareholders' equity, ending balance	23	23	23	23	23	22	23	23
Ordinary Shares | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						22		22
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	8,924,694	8,917,927	8,904,692	8,883,720	8,878,133	8,855,810	8,904,692	8,855,810
Compensation related to share-based awards	6,585	9,222	17,645	11,576	12,600	24,733	33,500	48,900
Exercise of options				(650)	(7,013)	4
Tax withholding for restricted shares	(1,070)	(2,467)	(4,398)			(2,414)
Other		12	(12)
Shareholders' equity, ending balance	8,930,209	8,924,694	8,917,927	8,894,646	8,883,720	8,878,133	8,930,209	8,894,646
Additional Paid-in Capital | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						8,855,810		8,855,810
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	(9,411,726)	(9,422,284)	(9,552,214)	(9,254,156)	(9,148,151)	(9,124,932)	(9,552,214)	(9,124,932)
Net income (loss)	(75,887)	10,558	129,930	(79,415)	(106,005)	(18,573)
Shareholders' equity, ending balance	(9,487,613)	(9,411,726)	(9,422,284)	(9,333,571)	(9,254,156)	(9,148,151)	(9,487,613)	(9,333,571)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						(4,646)		(4,646)
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						(9,129,578)		(9,129,578)
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance	(227,903)	(233,527)	(219,090)	(220,104)	(224,499)	(229,229)	(219,090)	(229,229)
Other comprehensive income (loss)	2,755	5,624	(14,437)	(2,515)	4,395	4,730
Shareholders' equity, ending balance	$ (225,148)	$ (227,903)	$ (233,527)	$ (222,619)	$ (220,104)	(224,499)	$ (225,148)	(222,619)
Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' equity, beginning balance						$ (229,229)		$ (229,229)