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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Trading Securities [Abstract] |  |
Fixed maturity investments trading, Due in less than one year, Amortized cost | $ 253,700 |
Fixed maturity investments trading, Due after one through five years, Amortized cost | 3,872,756 |
Fixed maturity investments trading, Due after five through ten years, Amortized cost | 1,031,351 |
Fixed maturity investments trading, Due after ten years, Amortized cost | 220,768 |
Fixed maturity investments trading, Amortized cost | 6,825,877 | $ 4,749,613
Fixed maturity investments trading, Due in less than one year, Fair value | 252,257 |
Fixed maturity investments trading, Due after one through five years, Fair value | 3,833,261 |
Fixed maturity investments trading, Due after five through ten years, Fair value | 1,011,132 |
Fixed maturity investments trading, Due after ten years, Fair value | 218,850 |
Fixed maturity investments trading, Fair value | 6,765,005 |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Due in less than one year, Amortized Cost | 0 |
Fixed maturity investments available-for-sale, Due after one through five years, Amortized cost | 0 |
Fixed maturity investments available-for-sale, Due after five through ten years, Amortized cost | 0 |
Fixed maturity investments available-for-sale, Due after ten years, Amortized cost | 0 |
Fixed maturity investments available-for-sale, Amortized cost | 15,943 | 23,772
Fixed maturity investments available-for-sale, Due in less than one year, Fair value | 0 |
Fixed maturity investments available-for-sale, Due after one through five years, Fair value | 0 |
Fixed maturity investments available-for-sale, Due after five through ten years, Fair value | 0 |
Fixed maturity investments available-for-sale, Due after ten years, Fair value | 0 |
Fixed maturity investments available-for-sale, Fair value | 17,813 | $ 26,885
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Due in less than one year, Amortized cost | 253,700 |
Fixed maturity investments, Due after one through five years, Amortized cost | 3,872,756 |
Fixed maturity investments, Due after five through ten years, Amortized cost | 1,031,351 |
Fixed maturity investments, Due after ten years, Amortized cost | 220,768 |
Fixed maturity investments, Amortized cost | 6,841,820 |
Fixed maturity investments, Due in less than one year, Fair value | 252,257 |
Fixed maturity investments, Due after one through give years, Fair value | 3,833,261 |
Fixed maturity investments, Due after five through ten years, Fair value | 1,011,132 |
Fixed maturity investments, Due after ten years, Fair value | 218,850 |
Fixed maturity investments, Fair value | 6,782,818 |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 1,318,468 |
Fixed maturity investments trading, Fair value | 1,321,228 |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Amortized cost | 13,726 |
Fixed maturity investments available-for-sale, Fair value | 15,549 |
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Amortized cost | 1,332,194 |
Fixed maturity investments, Fair value | 1,336,777 |
Asset-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 128,834 |
Fixed maturity investments trading, Fair value | 128,277 |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Amortized cost | 2,217 |
Fixed maturity investments available-for-sale, Fair value | 2,264 |
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Amortized cost | 131,051 |
Fixed maturity investments, Fair value | $ 130,541 |

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