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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Total fixed maturity investments trading | $ 7,092,969 | $ 6,891,244
U.S. treasuries |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 2,956,952 | 2,617,894
Agencies |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 41,109 | 90,972
Municipal |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 521,220 | 519,069
Non-U.S. government (Sovereign debt) |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 177,855 | 333,224
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 121,892 | 133,300
Corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 2,028,750 | 1,877,243
Agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 499,310 | 462,493
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 299,530 | 258,944
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 263,029 | 409,747
Asset-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | $ 183,322 | $ 188,358

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