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Income Taxes (Reconciliation Of Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ (112,223)	$ (193,155)	$ (128,298)
Non-U.S. rate differential — net	(26,985)	25,795	16,718
State income taxes — net	(3,367)	(3,413)	(2,640)
Stock-based compensation - tax benefit	13,298	14,015	0
Foreign derived intangible income benefit	7,930	0	0
Global intangible low-taxed income taxed in the U.S.	(5,955)	0	0
Effect of 2017 U.S. Tax Cuts and Jobs Act	4,747	(48,126)	0
Effect of changes in enacted tax rates on deferred tax assets and liabilities	(1,422)	(1,281)	(111)
Effect of changes in enacted tax rates on prepaid taxes	(6,585)	0	0
Federal and state tax credits	11,024	9,210	9,840
Change in reserves, including interest and penalties	(2,290)	(4,350)	1,105
Change in valuation allowance	(7,421)	51	26
Other — net	(977)	(3,029)	(2,489)
Provision for income taxes	$ (130,226)	$ (204,283)	$ (105,849)

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