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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fixed maturity investments | $ 13,506,503 | $ 11,171,655
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 4,960,409 | 4,467,345
Agencies |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 368,032 | 343,031
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 491,531 | 497,392
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 338,014 | 321,356
Corporate |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 4,261,025 | 3,075,660
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 1,113,792 | 1,148,499
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 291,444 | 294,604
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | 791,272 | 468,698
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Fixed maturity investments | $ 890,984 | $ 555,070

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