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Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 481,621 |  |  |  | $ 504,147 |  |  |  | $ 481,621 | $ 504,147 |
Net investment income | 45,918 | $ 28,338 | $ 38,604 | $ 39,707 | 25,886 | $ 24,941 | $ 34,541 | $ 38,948 | 152,567 | 124,316 | $ 208,028
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | (13,549) | (1,393) | 75,789
Initial commitments | 724,500 |  |  |  |  |  |  |  | 724,500 |  |
Fulfilled commitments | 528,800 |  |  |  |  |  |  |  | 528,800 |  |
Unfunded commitments | 204,500 |  |  |  |  |  |  |  | 204,500 |  |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 21,900 | 30,000 | 119,500
Other Investments | Net investment income |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) recognized in earnings |  |  |  |  |  |  |  |  | (13,500) | (1,400) | 75,800
Catastrophe bonds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 241,253 |  |  |  | 200,329 |  |  |  | 241,253 | 200,329 |
Private equity partnerships |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 214,848 |  |  |  | 281,932 |  |  |  | 214,848 | 281,932 |
Senior secured bank loan fund |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 23,231 |  |  |  | 19,316 |  |  |  | 23,231 | 19,316 |
Hedge funds |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | $ 2,289 |  |  |  | $ 2,570 |  |  |  | 2,289 | 2,570 |
Change in estimate of fair value | Other Investments |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ (2,500) | $ (600) | $ (3,700)

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