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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 11,045,801 | $ 11,171,655
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 3,915,130 | 4,467,345
Agencies |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 537,490 | 343,031
Non-U.S. government |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 635,282 | 497,392
Non-U.S. government-backed corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 283,577 | 321,356
Corporate |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 3,259,780 | 3,075,660
Agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 1,056,272 | 1,148,499
Non-agency mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 275,026 | 294,604
Commercial mortgage-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | 540,502 | 468,698
Asset-backed |  |
Schedule of Investments [Line Items] |  |
Total fixed maturity investments trading | $ 542,742 | $ 555,070

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