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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fixed maturity investments | $ 13,507,131 | $ 13,506,503
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 6,247,779 | 4,960,409
Agencies |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 361,684 | 368,032
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 549,613 | 491,531
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 474,848 | 338,014
Corporate |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 3,214,438 | 4,261,025
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 721,955 | 1,113,792
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 233,346 | 291,444
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 634,925 | 791,272
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | $ 1,068,543 | $ 890,984

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