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Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 549,805 |  |  |  | $ 481,621 |  |  |  | $ 549,805 | $ 481,621 |
Net investment income | 47,316 | $ 51,423 | $ 54,124 | $ 28,863 | 45,918 | $ 28,338 | $ 38,604 | $ 39,707 | 181,726 | 152,567 | $ 124,316
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | 11,542 | (13,549) | (1,393)
Initial commitments | 794,200 |  |  |  |  |  |  |  | 794,200 |  |
Fulfilled commitments | 554,700 |  |  |  |  |  |  |  | 554,700 |  |
Unfunded commitments | 249,400 |  |  |  |  |  |  |  | 249,400 |  |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 26,300 | 21,900 | 30,000
Net unrealized gains (losses) recognized in earnings due to change in estimate |  |  |  |  |  |  |  |  | (3,400) | (2,500) | (600)
Other Investments | Net investment income |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | 11,500 | 10,400 | $ 17,700
Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 335,209 |  |  |  | 241,253 |  |  |  | 335,209 | 241,253 |
Private equity partnerships |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 191,061 |  |  |  | 214,848 |  |  |  | 191,061 | 214,848 |
Senior secured bank loan funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 22,040 |  |  |  | 23,231 |  |  |  | 22,040 | 23,231 |
Hedge funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 1,495 |  |  |  | $ 2,289 |  |  |  | $ 1,495 | $ 2,289 |

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