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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost, Due in less than one year | $ 217,858 |
Trading Debt Securities, Amortized Cost, Due after one through five years | 4,002,809 |
Trading Debt Securities, Amortized Cost, Due after five through ten years | 1,028,014 |
Trading Debt Securities, Amortized Cost, Due after ten years | 207,716 |
Trading Debt Securities, Amortized Cost | 6,858,254 |
Trading Debt Securities, Fair Value, Due in less than one year | 215,975 |
Trading Debt Securities, Fair Value, Due after one through five years | 4,011,832 |
Trading Debt Securities, Fair Value, Due after five through ten years | 1,035,877 |
Trading Debt Securities, Fair Value, Due after ten years | 214,193 |
Trading Debt Securities, Fair Value | 6,890,592 |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost, Due in less than one year | 0 |
Available for Sale, Amortized Cost, Due after one through five years | 0 |
Available for Sale, Amortized Cost, Due after five through ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for Sale, Amortized Cost | 12,384 | $ 15,943
Available for Sale, Fair Value, Due in less than one year | 0 |
Available for Sale, Fair Value, Due after one through five years | 0 |
Available for Sale, Fair Value, Due after five through ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 0 |
Available for Sale, Fair Value | 13,985 | $ 17,813
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost, Due in less than one year | 217,858 |
Debt Securities, Amortized Cost, Due after one through five years | 4,002,809 |
Debt Securities, Amortized Cost, Due after five through ten years | 1,028,014 |
Debt Securities, Amortized Cost, Due after ten years | 207,716 |
Debt Securities, Amortized Cost | 6,870,638 |
Debt Securities, Fair Value, Due in less than one year | 215,975 |
Debt Securities, Fair Value, Due after one through five years | 4,011,832 |
Debt Securities, Fair Value, Due after five through ten years | 1,035,877 |
Debt Securities, Fair Value, Due after ten years | 214,193 |
Debt Securities, Fair Value | 6,904,577 |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 1,270,780 |
Trading Debt Securities, Fair Value | 1,281,620 |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 12,384 |
Available for Sale, Fair Value | 13,985 |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 1,283,164 |
Debt Securities, Fair Value | 1,295,605 |
Asset-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 131,077 |
Trading Debt Securities, Fair Value | 131,095 |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 0 |
Available for Sale, Fair Value | 0 |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 131,077 |
Debt Securities, Fair Value | $ 131,095 |

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