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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]                      
Statutory rate                 $ 136,744 $ 125,485 $ 112,215
State income taxes, net of federal income tax                 27,934 28,333 30,762
Change in uncertain tax position                 666 2,661 (617)
Foreign tax rate difference                 (2,032) (629) (318)
Excess tax benefit from stock-based compensation                 (21,605) (9,670) (3,700)
Revaluation of deferred tax assets                     (3,006)
Other, net                 5,981 2,972 5,058
Provision for income taxes $ 46,232 $ 37,866 $ 35,073 $ 28,517 $ 31,925 $ 40,632 $ 38,225 $ 38,370 $ 147,688 $ 149,152 $ 140,394