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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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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 | $ 387,348 |  |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost | 5,969,737 |  |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost | 9,922,493 |  |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost | 9,691,164 |  |
Fixed maturity securities, available for sale, due after twenty years, amortized cost | 7,783,150 |  |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost | 33,753,892 |  |
Fixed maturity securities, available for sale, amortized cost | 47,254,063 | [1] | $ 48,238,946
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, due in one year or less, fair value | 389,729 |  |
Fixed maturity securities, available for sale, due after one year through five years, fair value | 5,968,168 |  |
Fixed maturity securities, available for sale, due after five years through ten years, fair value | 10,073,950 |  |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value | 10,713,363 |  |
Fixed maturity securities, available for sale, due after twenty years, fair value | 8,331,477 |  |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value | 35,476,687 |  |
Fixed maturity securities, available for sale, fair value | 47,704,867 |  | 51,580,490
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 | 1,671,466 |  |
Fixed maturity securities, available for sale, amortized cost | 1,671,466 | [1] | 1,477,738
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 1,765,033 |  |
Fixed maturity securities, available for sale, fair value | 1,765,033 |  | 1,575,664
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 | 5,540,607 |  |
Fixed maturity securities, available for sale, amortized cost | 5,540,607 | [1] | 5,591,167
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 5,296,112 |  |
Fixed maturity securities, available for sale, fair value | 5,296,112 |  | 5,786,279
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 | 6,288,098 |  |
Fixed maturity securities, available for sale, amortized cost | 6,288,098 | [1] | 6,250,369
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |  |
Fixed maturity securities, available for sale, securities without a single maturity date, fair value | 5,167,035 |  |
Fixed maturity securities, available for sale, fair value | $ 5,167,035 |  | $ 6,162,156
[1] | (1) Amortized cost excludes accrued interest receivable of $456.1 million as of March 31, 2020.

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