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Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current Federal Tax Expense (Benefit) | $ 78,431 | $ 131,108 | $ 1,020
Current Federal Tax Expense (Benefit) Relating To US Tax Reform | (68,080) | 0 | 0
Current Foreign Tax Expense (Benefit) | 43,120 | 36,830 | 47,706
Current Income Tax Expense (Benefit) | 53,471 | 167,938 | 48,726
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred Federal Income Tax Expense (Benefit) | 62,890 | 159,853 | 273,928
Deferred Federal Income Tax Expense (Benefit) Related To US Tax Reform | 5,907 | (1,033,755) | 0
Tax Adjustments, Settlements, and Unusual Provisions | (62,173) | (1,033,755) | 0
Deferred Foreign Income Tax Expense (Benefit) | 7,710 | 26,598 | 19,849
Deferred income taxes | 76,507 | (847,304) | 293,777
Income Tax Expense (Benefit) | $ 129,978 | $ (679,366) | $ 342,503

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