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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments [Abstract] |
Schedule of Fair Value of Fixed Maturity Investments Trading | The following table summarizes the fair value of fixed maturity investments trading:
|  | December 31, 2015 |  | December 31, 2014 |
| U.S. treasuries | $ | 2,064,944 |  |  | $ | 1,671,471 |  |
| Agencies | 137,976 |  |  | 96,208 |  |
| Municipal | 583,282 |  |  | — |  |
| Non-U.S. government (Sovereign debt) | 334,981 |  |  | 280,651 |  |
| Non-U.S. government-backed corporate | 138,994 |  |  | 146,467 |  |
| Corporate | 2,055,323 |  |  | 1,610,442 |  |
| Agency mortgage-backed | 504,368 |  |  | 312,333 |  |
| Non-agency mortgage-backed | 262,235 |  |  | 241,590 |  |
| Commercial mortgage-backed | 554,625 |  |  | 373,117 |  |
| Asset-backed | 128,277 |  |  | 24,406 |  |
| Total fixed maturity investments trading | $ | 6,765,005 |  |  | $ | 4,756,685 |  |
Schedule of Fair Value of Fixed Maturity Investments Available For Sale | The following table summarizes the amortized cost, fair value and related unrealized gains and losses and non-credit other-than-temporary impairments of fixed maturity investments available for sale:
|  |  |  | Included in Accumulated Other Comprehensive Income |  |  |  |  |
| At December 31, 2015 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Non-Credit Other-Than- Temporary Impairments (1) |
| Agency mortgage-backed | $ | 143 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 150 |  |  | $ | — |  |
| Non-agency mortgage-backed | 7,005 |  |  | 1,523 |  |  | — |  |  | 8,528 |  |  | 550 |  |
| Commercial mortgage-backed | 6,578 |  |  | 293 |  |  | — |  |  | 6,871 |  |  | — |  |
| Asset-backed | 2,217 |  |  | 47 |  |  | — |  |  | 2,264 |  |  | — |  |
| Total fixed maturity investments available for sale | $ | 15,943 |  |  | $ | 1,870 |  |  | $ | — |  |  | $ | 17,813 |  |  | $ | 550 |  |
|  |  |  | Included in Accumulated Other Comprehensive Income |  |  |  |  |
| At December 31, 2014 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Non-Credit Other-Than- Temporary Impairments (1) |
| Agency mortgage-backed | $ | 3,928 |  |  | $ | 359 |  |  | $ | — |  |  | $ | 4,287 |  |  | $ | — |  |
| Non-agency mortgage-backed | 9,478 |  |  | 1,985 |  |  | (3 | ) |  | 11,460 |  |  | 656 |  |
| Commercial mortgage-backed | 7,291 |  |  | 643 |  |  | — |  |  | 7,934 |  |  | — |  |
| Asset-backed | 3,075 |  |  | 129 |  |  | — |  |  | 3,204 |  |  | — |  |
| Total fixed maturity investments available for sale | $ | 23,772 |  |  | $ | 3,116 |  |  | $ | (3 | ) |  | $ | 26,885 |  |  | $ | 656 |  |
(1) | Represents the non-credit component of other-than-temporary impairments recognized in accumulated other comprehensive income adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.
Schedule of Contractual Maturities of Fixed Maturity Investments | Contractual maturities of fixed maturity investments are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Trading |  | Available for Sale |  | Total Fixed Maturity Investments |
| At December 31, 2015 | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |
| Due in less than one year | $ | 253,700 |  |  | $ | 252,257 |  |  | $ | — |  |  | $ | — |  |  | $ | 253,700 |  |  | $ | 252,257 |  |
| Due after one through five years | 3,872,756 |  |  | 3,833,261 |  |  | — |  |  | — |  |  | 3,872,756 |  |  | 3,833,261 |  |
| Due after five through ten years | 1,031,351 |  |  | 1,011,132 |  |  | — |  |  | — |  |  | 1,031,351 |  |  | 1,011,132 |  |
| Due after ten years | 220,768 |  |  | 218,850 |  |  | — |  |  | — |  |  | 220,768 |  |  | 218,850 |  |
| Mortgage-backed | 1,318,468 |  |  | 1,321,228 |  |  | 13,726 |  |  | 15,549 |  |  | 1,332,194 |  |  | 1,336,777 |  |
| Asset-backed | 128,834 |  |  | 128,277 |  |  | 2,217 |  |  | 2,264 |  |  | 131,051 |  |  | 130,541 |  |
| Total | $ | 6,825,877 |  |  | $ | 6,765,005 |  |  | $ | 15,943 |  |  | $ | 17,813 |  |  | $ | 6,841,820 |  |  | $ | 6,782,818 |  |
Schedule of Fair Value of Equity Investments Trading | The following table summarizes the fair value of equity investments trading:
|  | December 31, 2015 |  | December 31, 2014 |
| Financials | $ | 193,716 |  |  | $ | 222,190 |  |
| Communications and technology | 65,833 |  |  | 31,376 |  |
| Industrial, utilities and energy | 51,168 |  |  | 28,859 |  |
| Consumer | 40,918 |  |  | 19,522 |  |
| Healthcare | 36,148 |  |  | 16,582 |  |
| Basic materials | 6,094 |  |  | 3,569 |  |
| Total | $ | 393,877 |  |  | $ | 322,098 |  |
Schedule of Net Investment Income | The components of net investment income are as follows:
| Year ended December 31, | 2015 |  | 2014 |  | 2013 |
| Fixed maturity investments | $ | 134,800 |  |  | $ | 100,855 |  |  | $ | 95,907 |  |
| Short term investments | 1,227 |  |  | 944 |  |  | 1,698 |  |
| Equity investments | 8,346 |  |  | 3,450 |  |  | 2,295 |  |
| Other investments |  |  |  |  |  |
| Private equity investments | 9,455 |  |  | 18,974 |  |  | 45,767 |  |
| Other | 12,472 |  |  | 11,037 |  |  | 73,735 |  |
| Cash and cash equivalents | 467 |  |  | 395 |  |  | 191 |  |
|  | 166,767 |  |  | 135,655 |  |  | 219,593 |  |
| Investment expenses | (14,200 | ) |  | (11,339 | ) |  | (11,565 | ) |
| Net investment income | $ | 152,567 |  |  | $ | 124,316 |  |  | $ | 208,028 |  |
Schedule of Net Realized and Unrealized Gains On Investments and Net Other-Than-Temporary Impairments | Net realized and unrealized (losses) gains on investments are as follows:
| Year ended December 31, | 2015 |  | 2014 |  | 2013 |
| Gross realized gains | $ | 50,488 |  |  | $ | 45,568 |  |  | $ | 72,492 |  |
| Gross realized losses | (53,630 | ) |  | (14,868 | ) |  | (50,206 | ) |
| Net realized (losses) gains on fixed maturity investments | (3,142 | ) |  | 30,700 |  |  | 22,286 |  |
| Net unrealized (losses) gains on fixed maturity investments trading | (64,908 | ) |  | 19,680 |  |  | (87,827 | ) |
| Net realized and unrealized gains (losses) on investments-related derivatives | 5,443 |  |  | (30,931 | ) |  | 31,058 |  |
| Net realized gains on equity investments trading | 16,348 |  |  | 10,908 |  |  | 26,650 |  |
| Net unrealized (losses) gains on equity investments trading | (22,659 | ) |  | 11,076 |  |  | 42,909 |  |
| Net realized and unrealized (losses) gains on investments | $ | (68,918 | ) |  | $ | 41,433 |  |  | $ | 35,076 |  |
Schedule of Reclassification out of Accumulated Other Comprehensive Income | The following table provides an analysis of the components of other comprehensive income and reclassifications out of accumulated other comprehensive income.
|  | Year ended December 31, 2015 |
|  | Investments in other ventures |  | Fixed maturity investments available for sale |  | Total |
| Beginning balance | $ | 303 |  |  | $ | 3,113 |  |  | $ | 3,416 |  |
| Other comprehensive loss before reclassifications | (65 | ) |  | (917 | ) |  | (982 | ) |
| Amounts reclassified from accumulated other comprehensive income by statement of operations line item: |  |  |  |  |  |
| Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized (losses) gains on investments | — |  |  | (326 | ) |  | (326 | ) |
| Net current-period other comprehensive loss | (65 | ) |  | (1,243 | ) |  | (1,308 | ) |
| Ending balance | $ | 238 |  |  | $ | 1,870 |  |  | $ | 2,108 |  |
|  | Year ended December 31, 2014 |
|  | Investments in other ventures |  | Fixed maturity investments available for sale |  | Total |
| Beginning balance | $ | 163 |  |  | $ | 3,968 |  |  | $ | 4,131 |  |
| Other comprehensive income (loss) before reclassifications | 140 |  |  | (855 | ) |  | (715 | ) |
| Amounts reclassified from accumulated other comprehensive income by statement of operations line item: |  |  |  |  |  |
| Realized gains reclassified from accumulated other comprehensive income to net realized and unrealized gains (losses) on investments | — |  |  | — |  |  | — |  |
| Net current-period other comprehensive income (loss) | 140 |  |  | (855 | ) |  | (715 | ) |
| Ending balance | $ | 303 |  |  | $ | 3,113 |  |  | $ | 3,416 |  |
Schedule of Fixed Maturity Investments Available For Sale In Continual Unrealized Loss Position | The following tables provide an analysis of the length of time the Company’s fixed maturity investments available for sale in an unrealized loss have been in a continual unrealized loss position.
|  | Less than 12 Months |  | 12 Months or Greater |  | Total |
| At December 31, 2015 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
| Total | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
|  | Less than 12 Months |  | 12 Months or Greater |  | Total |
| At December 31, 2014 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |
| Non-agency mortgage-backed | $ | — |  |  | $ | — |  |  | $ | 69 |  |  | $ | (3 | ) |  | $ | 69 |  |  | $ | (3 | ) |
| Total | $ | — |  |  | $ | — |  |  | $ | 69 |  |  | $ | (3 | ) |  | $ | 69 |  |  | $ | (3 | ) |
Rollforward of the Amount of Other-Than-Temporary Impairments Related To Credit Losses Recognized in Earnings For Which A Portion Of An Other-Than-Temporary Impairment Was Recognized In Accumulated Other Comprehensive Income | The following table provides a rollforward of the amount of other-than-temporary impairments related to credit losses recognized in earnings for which a portion of an other-than-temporary impairment was recognized in accumulated other comprehensive income:
|  | 2015 |  | 2014 |
| Balance – January 1 | $ | 498 |  |  | $ | 561 |  |
| Reductions: |  |  |  |
| Securities sold during the period | (81 | ) |  | (63 | ) |
| Balance – December 31 | $ | 417 |  |  | $ | 498 |  |
Schedule of Other Investments | The table below shows the fair value of the Company’s portfolio of other investments:
| At December 31, | 2015 |  | 2014 |
| Catastrophe bonds | $ | 241,253 |  |  | $ | 200,329 |  |
| Private equity partnerships | 214,848 |  |  | 281,932 |  |
| Senior secured bank loan fund | 23,231 |  |  | 19,316 |  |
| Hedge funds | 2,289 |  |  | 2,570 |  |
| Total other investments | $ | 481,621 |  |  | $ | 504,147 |  |
Schedule of Equity Method Investments | The table below shows the Company’s portfolio of investments in other ventures, under equity method:
|  | 2015 |  | 2014 |
| At December 31, | Investment |  | Ownership % |  | Carrying Value |  | Investment |  | Ownership % |  | Carrying Value |
| THIG | $ | 50,000 |  |  | 25.0 | % |  | $ | 19,155 |  |  | $ | 50,000 |  |  | 25.0 | % |  | $ | 20,811 |  |
| Tower Hill | 10,000 |  |  | 31.3 | % |  | 19,981 |  |  | 10,000 |  |  | 30.3 | % |  | 18,991 |  |
| Tower Hill Re | 4,250 |  |  | 25.0 | % |  | 4,136 |  |  | 4,250 |  |  | 25.0 | % |  | 5,162 |  |
| Tower Hill Signature | 500 |  |  | 25.0 | % |  | 7,315 |  |  | 500 |  |  | 25.0 | % |  | 5,692 |  |
| Total Tower Hill Companies | 64,750 |  |  |  |  | 50,587 |  |  | 64,750 |  |  |  |  | 50,656 |  |
| Top Layer Re | 65,375 |  |  | 50.0 | % |  | 68,936 |  |  | 65,375 |  |  | 50.0 | % |  | 60,911 |  |
| Other | 23,607 |  |  | 43.5 | % |  | 12,828 |  |  | 13,507 |  |  | 36.3 | % |  | 9,146 |  |
| Total investments in other ventures, under equity method | $ | 153,732 |  |  |  |  | $ | 132,351 |  |  | $ | 143,632 |  |  |  |  | $ | 120,713 |  |
Schedule of Equity In Earnings (Losses) of Equity Method Investments | The table below shows the Company’s equity in earnings of other ventures, under equity method:
| Year ended December 31, | 2015 |  | 2014 |  | 2013 |
| Tower Hill Companies | $ | 13,116 |  |  | $ | 18,376 |  |  | $ | 10,270 |  |
| Top Layer Re | 8,026 |  |  | 10,411 |  |  | 13,836 |  |
| Other | (661 | ) |  | (2,712 | ) |  | (912 | ) |
| Total equity in earnings of other ventures | $ | 20,481 |  |  | $ | 26,075 |  |  | $ | 23,194 |  |

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