Quarterly Financial Data (Unaudited) - Schedule Of Interim Financial Information Presents Results Of Operations On Quarterly Basis (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 476,457	$ 469,373	$ 500,479	$ 444,613	$ 436,399	$ 411,855	$ 394,386	$ 376,053
Gross margin	440,997	438,623	461,381	406,928	404,847	376,768	360,983	348,613
Net income	$ 159,470	$ 149,316	$ 92,321	$ 45,991	$ 232,207	$ 63,526	$ 105,604	$ 86,511	$ 447,098	$ 487,848	$ 396,831
Net income per ordinary share, basic (in dollars per share)	$ 2.69	$ 2.47	$ 1.53	$ 0.77	$ 3.87	$ 1.06	$ 1.76	$ 1.44	$ 7.45	$ 8.13	$ 6.56
Net income per ordinary share, diluted (in dollars per share)	$ 2.64	$ 2.41	$ 1.50	$ 0.75	$ 3.79	$ 1.03	$ 1.72	$ 1.41	$ 7.30	$ 7.96	$ 6.41
Estimated loss contingency				$ 57,000
Impairment charges and disposal costs			$ 44,000
Upfront and milestone payments expense				$ 11,000	$ 26,500	$ 75,000
Legal proceedings and restructuring expense								$ 6,000
Tax Cuts and Jobs Act of 2017 - net expense (benefit) of the impacts	$ (10,300)	$ 2,900			$ (148,800)				$ (7,500)	$ (148,800)