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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Fixed maturity securities, available for sale, due in one year or less, amortized cost | $ 372,763 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost | 5,629,851 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost | 10,015,444 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost | 9,853,081 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost | 8,462,051 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost | 34,333,190 |
Fixed maturity securities, available for sale, amortized cost | 46,727,050 | $ 46,131,190
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, due in one year or less, fair value | 375,768 |
Fixed maturity securities, available for sale, due after one year through five years, fair value | 5,733,881 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value | 10,199,974 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value | 10,534,563 |
Fixed maturity securities, available for sale, due after twenty years, fair value | 8,779,440 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value | 35,623,626 |
Fixed maturity securities, available for sale, fair value | 48,037,107 | 45,923,727
Residential Mortgage Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost | 1,116,718 |
Fixed maturity securities, available for sale, amortized cost | 1,116,718 | 1,134,623
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 1,201,332 |
Fixed maturity securities, available for sale, fair value | 1,201,332 | 1,202,159
Commercial Mortgage Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost | 5,493,082 |
Fixed maturity securities, available for sale, amortized cost | 5,493,082 | 5,492,271
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 5,543,512 |
Fixed maturity securities, available for sale, fair value | 5,543,512 | 5,379,003
Other Asset Backed Securities |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost | 5,784,060 |
Fixed maturity securities, available for sale, amortized cost | 5,784,060 | 5,693,255
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 5,668,637 |
Fixed maturity securities, available for sale, fair value | $ 5,668,637 | $ 5,464,329

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