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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment [Line Items] |  |
Fixed maturity investments | $ 11,171,655 | $ 8,088,870
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments | 4,467,345 | 3,331,411
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments | 343,031 | 174,883
Municipal |  |
Investment [Line Items] |  |
Fixed maturity investments | 0 | 6,854
Non-U.S. government |  |
Investment [Line Items] |  |
Fixed maturity investments | 497,392 | 279,818
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments | 321,356 | 160,063
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments | 3,075,660 | 2,450,244
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments | 1,148,499 | 817,880
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments | 294,604 | 278,680
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments | 468,698 | 282,294
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments | $ 555,070 | $ 306,743

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