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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 6,890,592 | $ 6,765,005
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 2,475,747 | 2,064,944
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 85,270 | 137,976
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 564,555 | 583,282
Non-U.S. government (Sovereign Debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 353,756 | 334,981
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 164,724 | 138,994
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 1,833,825 | 2,055,323
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 497,943 | 504,368
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 248,609 | 262,235
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 535,068 | 554,625
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 131,095 | $ 128,277

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