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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | $ 6,891,244 | $ 6,765,005
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 2,617,894 | 2,064,944
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 90,972 | 137,976
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 519,069 | 583,282
Non-U.S. government (Sovereign Debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 333,224 | 334,981
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 133,300 | 138,994
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 1,877,243 | 2,055,323
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 462,493 | 504,368
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 258,944 | 262,235
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 409,747 | 554,625
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | $ 188,358 | $ 128,277

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