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Income Taxes (Provision For Income Taxes/(Benefit)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current taxes: Federal |  |  |  |  |  |  |  |  | $ 89,971 | $ (29,396) | $ 7,927
Current taxes: State |  |  |  |  |  |  |  |  | 36,070 | (334) | 5,818
Current taxes: Foreign |  |  |  |  |  |  |  |  | 99 | (1,734) | 1,255
Current taxes: Total |  |  |  |  |  |  |  |  | 126,140 | (31,464) | 15,000
Deferred taxes: Federal |  |  |  |  |  |  |  |  | 11,932 | 114,842 | 39,127
Deferred taxes: State |  |  |  |  |  |  |  |  | 2,267 | 1,728 | 6,261
Deferred taxes: Foreign |  |  |  |  |  |  |  |  | 55 | 1,559 | 674
Deferred Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  | 14,254 | 118,129 | 46,062
Provision for income taxes | $ 41,869 | $ 36,672 | $ 31,060 | $ 30,793 | $ 1,168 | $ 41,603 | $ 30,387 | $ 13,507 | $ 140,394 | $ 86,665 | $ 61,062

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