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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | $ 7,426,555 | $ 6,891,244
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 3,168,763 | 2,617,894
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 47,646 | 90,972
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 509,802 | 519,069
Non-U.S. government (Sovereign debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 287,660 | 333,224
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 163,651 | 133,300
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 2,063,459 | 1,877,243
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 500,456 | 462,493
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 300,331 | 258,944
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | 202,062 | 409,747
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, fair value | $ 182,725 | $ 188,358

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