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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 13,029,085 | $ 13,507,131
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 5,792,746 | 6,247,779
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 363,256 | 361,684
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 485,193 | 549,613
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 431,008 | 474,848
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 3,420,946 | 3,214,438
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 714,176 | 721,955
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 212,145 | 233,346
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 567,186 | 634,925
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 1,042,429 | $ 1,068,543

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