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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 13,391,318 | $ 11,171,655
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 4,350,971 | 4,467,345
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 437,681 | 343,031
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 568,960 | 497,392
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 401,449 | 321,356
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 4,655,765 | 3,075,660
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 1,086,474 | 1,148,499
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 293,953 | 294,604
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 788,995 | 468,698
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 807,070 | $ 555,070

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