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Income Taxes (Provision For Income Taxes/(Benefit)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current taxes: Federal |  |  |  |  |  |  |  |  | $ (29,396) | $ 7,927 | $ 43,962
Current taxes: State |  |  |  |  |  |  |  |  | (334) | 5,818 | 9,672
Current taxes: Foreign |  |  |  |  |  |  |  |  | (1,734) | 1,255 | 1,329
Current taxes: Total |  |  |  |  |  |  |  |  | (31,464) | 15,000 | 54,963
Deferred taxes: Federal |  |  |  |  |  |  |  |  | 114,842 | 39,127 | (9,396)
Deferred taxes: State |  |  |  |  |  |  |  |  | 1,728 | 6,261 | 3,056
Deferred taxes: Foreign |  |  |  |  |  |  |  |  | 1,559 | 674 | 608
Deferred Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  | 118,129 | 46,062 | (5,732)
Provision for income taxes | $ 1,168 | $ 41,603 | $ 30,387 | $ 13,507 | $ 28,014 | $ 10,168 | $ 6,022 | $ 16,858 | $ 86,665 | $ 61,062 | $ 49,231

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