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Income Tax (Total Income Taxes Provided) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Effects Allocated Directly to Equity [Abstract]
Income Tax Expense (Benefit)	$ 129,978	$ (679,366)	$ 342,503
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(367,933)	306,849	157,929
Income Tax Effects Allocated Directly to Equity, Employee Stock Options	0	0	(162)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	19,101	(42,153)	21,081
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	134	404	1,772
Income Tax Expense (Benefit), Intraperiod Tax Allocation	$ (218,720)	$ (414,266)	$ 523,123

X

- Definition

Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities, including change in unrealized other-than-temporary impairments on fixed maturity securities.

+ References

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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) for continuing operations, discontinued operations, other comprehensive income, and items charged (credited) directly to shareholders' equity.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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