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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, due in one year or less, amortized cost | $ 250,055 |
Available for sale securities, due after one year through five years, amortized cost | 3,018,037 |
Available for sale securities, due after five years through ten years, amortized cost | 11,869,326 |
Available for sale securities, due after ten years through twenty years, amortized cost | 8,834,516 |
Available for sale securities, due after twenty years, amortized cost | 8,460,543 |
Available for sale securities, securities with a single maturity date, amortized cost | 32,432,477 |
Available for sale securities, amortized cost | 40,717,733 | $ 39,953,955
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, due in one year or less, fair value | 255,489 |
Available for sale securities, due after one year through five years, fair value | 3,173,708 |
Available for sale securities, due after five years through ten years, fair value | 12,056,727 |
Available for sale securities, due after ten years through twenty years, fair value | 9,391,491 |
Available for sale securities, due after twenty years, fair value | 8,863,365 |
Available for sale securities, securities with a single maturity date, fair value | 33,740,780 |
Available for sale securities, fair value | 42,105,366 | 41,060,494
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, due in one year or less, amortized cost | 0 |
Held for investment securities, due after one year through five years, amortized cost | 0 |
Held for investment securities, due after five years through ten years, amortized cost | 0 |
Held for investment securities, due after ten years through twenty years, amortized cost | 0 |
Held for investment securities, due after twenty years, amortized cost | 76,878 |
Held for investment securities, securities with a single maturity date, amortized cost | 76,878 |
Held for investment, amortized cost | 76,878 | 76,825
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, due in one year or less, fair value | 0 |
Held for investment securities, due after one year through five years, fair value | 0 |
Held for investment securities, due after five years through ten years, fair value | 0 |
Held for investment securities, due after ten years through twenty years, fair value | 0 |
Held for investment securities, due after twenty years, fair value | 70,795 |
Held for investment securities, securities with a single maturity date, fair value | 70,795 |
Held for investment | 70,795 | $ 68,766
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract] |  |
Available for sale securities, securities without a single maturity date, amortized cost | 1,119,318 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 1,200,040 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, 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, securities without a single maturity date, amortized cost | 5,406,475 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 5,383,942 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, 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, securities without a single maturity date, amortized cost | 1,759,463 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 1,780,604 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |
Held for investment securities, securities without a single maturity date, amortized cost | 0 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] |  |
Held for investment securities, securities without a single maturity date, fair value | $ 0 |

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