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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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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 | $ 134,699 |
Available for sale securities, due after one year through five years, amortized cost | 1,818,945 |
Available for sale securities, due after five years through ten years, amortized cost | 9,951,489 |
Available for sale securities, due after ten years through twenty years, amortized cost | 8,419,743 |
Available for sale securities, due after twenty years, amortized cost | 7,353,317 |
Available for sale securities, securities with a single maturity date, amortized cost | 27,678,193 |
Available for sale securities, amortized cost | 34,058,330 | $ 30,205,046
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, due in one year or less, fair value | 138,612 |
Available for sale securities, due after one year through five years, fair value | 1,969,759 |
Available for sale securities, due after five years through ten years, fair value | 10,005,018 |
Available for sale securities, due after ten years through twenty years, fair value | 8,976,207 |
Available for sale securities, due after twenty years, fair value | 7,700,456 |
Available for sale securities, securities with a single maturity date, fair value | 28,790,052 |
Available for sale securities, fair value | 35,389,842 | 32,445,202
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 | 76,574 |
Held for investment securities, securities with a single maturity date, amortized cost | 76,574 |
Held for investment, amortized cost | 76,574 | 76,432
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 | 62,000 |
Held for investment securities, securities with a single maturity date, fair value | 62,000 |
Held for investment | 62,000 | $ 75,838
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 | 1,431,656 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 1,556,308 |
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 | 3,881,487 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 3,941,863 |
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 | 1,066,994 |
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |  |
Available for sale securities, securities without a single maturity date, fair value | 1,101,619 |
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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