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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 13,309,234 | $ 13,506,503
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 5,107,878 | 4,960,409
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 227,184 | 368,032
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 518,162 | 491,531
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 335,662 | 338,014
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 4,289,072 | 4,261,025
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 957,563 | 1,113,792
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 272,529 | 291,444
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 713,044 | 791,272
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 888,140 | $ 890,984

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