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Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 1,087,377 |  |  |  | $ 784,933 |  |  |  | $ 1,087,377 | $ 784,933 |
Net investment income | 112,695 | $ 113,844 | $ 115,832 | $ 81,462 | 53,338 | $ 80,696 | $ 71,356 | $ 56,476 | 423,833 | 261,866 | $ 222,209
Initial commitments | 1,100,000 |  |  |  |  |  |  |  | 1,100,000 |  |
Fulfilled commitments | 708,400 |  |  |  |  |  |  |  | 708,400 |  |
Unfunded commitments | 411,300 |  |  |  |  |  |  |  | 411,300 |  |
Other investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 54,200 | 23,000 | 42,100
Net unrealized gains recognized in earnings due to change in estimate |  |  |  |  |  |  |  |  | (5,500) | 300 | 1,900
Other investments | Net investment income |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains recognized in earnings |  |  |  |  |  |  |  |  | 12,200 | (8,300) | $ 24,700
Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 781,641 |  |  |  | 516,571 |  |  |  | 781,641 | 516,571 |
Private equity investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 271,047 |  |  |  | 242,647 |  |  |  | 271,047 | 242,647 |
Senior secured bank loan funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 22,598 |  |  |  | 14,482 |  |  |  | 22,598 | 14,482 |
Hedge funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 12,091 |  |  |  | $ 11,233 |  |  |  | $ 12,091 | $ 11,233 |

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