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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 6,591,434 | $ 4,756,685
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 2,020,746 | 1,671,471
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 144,947 | 96,208
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 806,724 | 0
Non-U.S. government (Sovereign Debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 370,613 | 280,651
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 172,381 | 146,467
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 1,865,369 | 1,610,442
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 474,966 | 312,333
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 253,044 | 241,590
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | 419,218 | 373,117
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, at fair value | $ 63,426 | $ 24,406

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