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Income Taxes (Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Statutory rate									$ 125,485	$ 112,215	$ 94,338
State income taxes, net of federal income tax									28,333	30,762	6,721
Change in uncertain tax position									2,661	(617)	1,544
Foreign tax rate difference									(629)	(318)	(412)
Excess tax benefit from stock-based compensation									(9,670)	(3,700)	(57,431)
Revaluation of deferred tax assets										(3,006)	42,443
Other, net									2,972	5,058	(538)
Provision for income taxes	$ 31,925	$ 40,632	$ 38,225	$ 38,370	$ 41,869	$ 36,672	$ 31,060	$ 30,793	$ 149,152	$ 140,394	$ 86,665

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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