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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments trading | $ 8,088,870 | $ 7,426,555
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 3,331,411 | 3,168,763
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 174,883 | 47,646
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 6,854 | 509,802
Non-U.S. government |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 279,818 | 287,660
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 160,063 | 163,651
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 2,450,244 | 2,063,459
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 817,880 | 500,456
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 278,680 | 300,331
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading | 282,294 | 202,062
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading | $ 306,743 | $ 182,725

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