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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Total fixed maturity investments trading | $ 9,473,160 | $ 8,088,870
U.S. treasuries |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 3,097,089 | 3,331,411
Agencies |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 182,904 | 174,883
Municipal |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 256,967 | 6,854
Non-U.S. government |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 687,021 | 279,818
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 286,331 | 160,063
Corporate |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 2,971,018 | 2,450,244
Agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 955,616 | 817,880
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 272,880 | 278,680
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 245,323 | 282,294
Asset-backed |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | 518,011 | $ 306,743
TMR Group Entities |  |
Investment [Line Items] |  |
Total fixed maturity investments trading | $ 2,200,000 |

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