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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 306,324 |
Fixed maturity securities, available for sale, due after one year through five years, amortized cost | 5,806,384 |
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost | 10,032,375 |
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost | 9,994,917 |
Fixed maturity securities, available for sale, due after twenty years, amortized cost | 8,481,029 |
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost | 34,621,029 |
Fixed maturity securities, available for sale, amortized cost | 47,477,956 | $ 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 | 309,641 |
Fixed maturity securities, available for sale, due after one year through five years, fair value | 6,000,221 |
Fixed maturity securities, available for sale, due after five years through ten years, fair value | 10,529,772 |
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value | 11,017,627 |
Fixed maturity securities, available for sale, due after twenty years, fair value | 9,214,691 |
Fixed maturity securities, available for sale, securities with a single maturity date, fair value | 37,071,952 |
Fixed maturity securities, available for sale, fair value | 50,171,303 | 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 | 1,232,918 |
Fixed maturity securities, available for sale, amortized cost | 1,232,918 | 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 | 1,338,946 |
Fixed maturity securities, available for sale, fair value | 1,338,946 | 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 | 5,483,813 |
Fixed maturity securities, available for sale, amortized cost | 5,483,813 | 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 | 5,673,990 |
Fixed maturity securities, available for sale, fair value | 5,673,990 | 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 | 6,140,196 |
Fixed maturity securities, available for sale, amortized cost | 6,140,196 | 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 | 6,086,415 |
Fixed maturity securities, available for sale, fair value | $ 6,086,415 | $ 5,464,329

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