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Equity (Components of Net Unrealized Appreciation Depreciation of Balances Carried at Fair Value) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Fixed maturity securities available-for-sale |  | $ 39,992,346 | $ 38,150,820 |  |
Other invested assets |  | 1,915,297 | 1,505,332 |  |
Deferred policy acquisition costs |  | 3,397,770 | 3,239,824 | $ 3,338,605 | $ 3,392,437
Accumulated Other Comprehensive Income Loss Change In Component During Period |  | (1,712,435) | 1,004,927 | 577,265 |
Change In Net Unrealized Appreciation Depreciation [Member] |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Fixed maturity securities available-for-sale |  | (1,759,230) | 987,570 | 561,906 |
Other invested assets | [1] | 20,187 | 25,577 | 18,900 |
Effect On Unrealized Appreciation Depreciation [Member] |  |  |  |  |
Comprehensive Income Net Of Tax [Line Items] |  |  |  |  |
Deferred policy acquisition costs |  | $ 26,608 | $ (8,220) | $ (3,541) |
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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