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Income Taxes (Provision For Income Taxes/(Benefit)) (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] |  |  |  |  |  |  |  |  |  |  |
Current taxes: Federal |  |  |  |  |  |  |  |  | $ 143,859 | $ 123,802 | $ 89,971
Current taxes: State |  |  |  |  |  |  |  |  | 42,705 | 30,464 | 36,070
Current taxes: Foreign |  |  |  |  |  |  |  |  | (236) | 1,684 | 99
Current taxes: Total |  |  |  |  |  |  |  |  | 186,328 | 155,950 | 126,140
Deferred taxes: Federal |  |  |  |  |  |  |  |  | (31,019) | (7,027) | 11,932
Deferred taxes: State |  |  |  |  |  |  |  |  | (5,803) | 4,266 | 2,267
Deferred taxes: Foreign |  |  |  |  |  |  |  |  | (1,818) | (4,037) | 55
Deferred Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  | (38,640) | (6,798) | 14,254
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

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