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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, due in one year or less, amortized cost | $ 236,707 |
Available for sale, due after one year through five years, amortized cost | 2,824,776 |
Available for sale, due after five years through ten years, amortized cost | 11,659,762 |
Available for sale, due after ten years through twenty years, amortized cost | 8,792,470 |
Available for sale, due after twenty years, amortized cost | 8,055,686 |
Available for sale, securities with a single maturity date, amortized cost | 31,569,401 |
Available for sale, amortized cost | 39,953,955 | $ 35,823,710
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, due in one year or less, fair value | 241,934 |
Available for sale, due after one year through five years, fair value | 2,979,768 |
Available for sale, due after five years through ten years, fair value | 11,738,156 |
Available for sale, due after ten years through twenty years, fair value | 9,284,726 |
Available for sale, due after twenty years, fair value | 8,389,717 |
Available for sale, securities with a single maturity date, fair value | 32,634,301 |
Available for sale, fair value | 41,060,494 | 36,421,839
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, due in one year or less, amortized cost | 0 |
Held for investment, due after one year through five years, amortized cost | 0 |
Held for investment, due after five years through ten years, amortized cost | 0 |
Held for investment, due after ten years through twenty years, amortized cost | 0 |
Held for investment, due after twenty years, amortized cost | 76,825 |
Held for investment, securities with a single maturity date, amortized cost | 76,825 |
Held for investment, amortized cost | 76,825 | 76,622
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, due in one year or less, fair value | 0 |
Held for investment, due after one year through five years, fair value | 0 |
Held for investment, due after five years through ten years, fair value | 0 |
Held for investment, due after ten years through twenty years, fair value | 0 |
Held for investment, due after twenty years, fair value | 68,766 |
Held for investment, securities with a single maturity date, fair value | 68,766 |
Held for investment, fair value | 68,766 | $ 65,377
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 1,166,944 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 1,254,835 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | 0 |
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 5,422,255 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 5,365,235 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | 0 |
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale, securities without a single maturity date, amortized cost | 1,795,355 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale, securities without a single maturity date, fair value | 1,806,123 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment, securities without a single maturity date, fair value | $ 0 |

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