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, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Statutory rate	$ 185,874	$ 224,087	$ 136,744
State income taxes, net of federal income tax	42,813	37,169	27,934
Change in valuation allowance	9,802	2,248	2,125
Foreign tax rate difference	(2,846)	125	(2,032)
Excess tax benefit from stock-based compensation	(19,418)	(32,004)	(21,605)
Non-deductible business expenses	10,944	9,732	7,957
Other, net	(4,208)	866	(3,435)
Provision for income taxes	$ 222,961	$ 242,223	$ 147,688