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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Total fixed maturity investments trading | $ 11,386,228 | $ 8,088,870
U.S. treasuries |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 4,314,006 | 3,331,411
Agencies |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 507,903 | 174,883
Municipal |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 1,629 | 6,854
Non-U.S. government |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 379,154 | 279,818
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 263,170 | 160,063
Corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 3,453,222 | 2,450,244
Agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 1,248,722 | 817,880
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 261,850 | 278,680
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 406,268 | 282,294
Asset-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | $ 550,304 | $ 306,743

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