Income Taxes (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected tax expense at U.S. Federal statutory rates	$ 433,059	$ 257,556	$ 169,860
State income taxes, net of Federal income tax effect	47,909	33,611	6,404
Foreign earnings at other than U.S. rates	56,969	63,519	(87,514)
Federal and California R&D tax credits	(134,523)	(140,749)	(79,868)
Excess tax benefits on stock-based compensation	(148,693)	(191,323)	(157,888)
Impact of the Tax Cuts and Jobs Act of 2017
Rate Change / Transition Tax	0	(71,516)	79,077
Tax effects of the Tax Cuts and Jobs Act	(127,534)	43,099	0
Global corporate structure simplification	35,939	0	0
Nondeductible Officers Compensation	24,111	14,377	28
Other	8,078	6,642	(3,707)
Provision for (benefit from) income taxes	$ 195,315	$ 15,216	$ (73,608)
Effective Tax Rate	9.00%	1.00%	(15.00%)

Effective Income Tax Rate Reconciliation, Tax Structure Simplification

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