Income Taxes (Reconciliation Of The Statutory Federal Income Tax With The Company's Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]
Statutory rate	$ 224,087	$ 136,744	$ 125,485
State income taxes, net of federal income tax	37,169	27,934	28,333
Change in uncertain tax position	841	666	2,661
Foreign tax rate difference	125	(2,032)	(629)
Excess tax benefit from stock-based compensation	(32,004)	(21,605)	(9,670)
Non-deductible business expenses	9,732	7,957	8,390
Other, net	2,273	(1,976)	(5,418)
Provision for income taxes	$ 242,223	$ 147,688	$ 149,152