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SEGMENT INFORMATION (TABLES) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
UNDERWRITING RESULTS OF REPORTABLE SEGMENTS | The following tables summarize the underwriting results of our reportable segments, as well as the carrying values of allocated goodwill and intangible assets:
| At and year ended December 31, 2015 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 2,583,081 |  |  | $ | 2,020,649 |  |  | $ | 4,603,730 |  |
| Net premiums written | 1,759,359 |  |  | 1,915,307 |  |  | 3,674,666 |  |
| Net premiums earned | 1,798,191 |  |  | 1,888,226 |  |  | 3,686,417 |  |
| Other insurance related income (loss) | 1,036 |  |  | (3,989 | ) |  | (2,953 | ) |
| Net losses and loss expenses | (1,154,928 | ) |  | (1,021,271 | ) |  | (2,176,199 | ) |
| Acquisition costs | (261,208 | ) |  | (456,904 | ) |  | (718,112 | ) |
| General and administrative expenses | (341,658 | ) |  | (145,253 | ) |  | (486,911 | ) |
| Underwriting income | $ | 41,433 |  |  | $ | 260,809 |  |  | 302,242 |  |
| Corporate expenses |  |  |  |  | (109,910 | ) |
| Net investment income |  |  |  |  | 305,336 |  |
| Net realized investment losses |  |  |  |  | (138,491 | ) |
| Foreign exchange gains |  |  |  |  | 102,312 |  |
| Interest expense and financing costs |  |  |  |  | (50,963 | ) |
| Termination fee received |  |  |  |  | 280,000 |  |
| Reorganization and related expenses |  |  |  |  | (45,867 | ) |
| Income before income taxes |  |  |  |  | $ | 644,659 |  |
| Net loss and loss expense ratio | 64.2 | % |  | 54.1 | % |  | 59.0 | % |
| Acquisition cost ratio | 14.5 | % |  | 24.2 | % |  | 19.5 | % |
| General and administrative expense ratio | 19.1 | % |  | 7.7 | % |  | 16.2 | % |
| Combined ratio | 97.8 | % |  | 86.0 | % |  | 94.7 | % |
| Goodwill and intangible assets | $ | 86,858 |  |  | $ | — |  |  | $ | 86,858 |  |
| At and year ended December 31, 2014 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 2,535,415 |  |  | $ | 2,176,104 |  |  | $ | 4,711,519 |  |
| Net premiums written | 1,779,501 |  |  | 2,127,474 |  |  | 3,906,975 |  |
| Net premiums earned | 1,830,544 |  |  | 2,040,455 |  |  | 3,870,999 |  |
| Other insurance related income (loss) | (11 | ) |  | 661 |  |  | 650 |  |
| Net losses and loss expenses | (1,131,880 | ) |  | (1,054,842 | ) |  | (2,186,722 | ) |
| Acquisition costs | (278,804 | ) |  | (458,393 | ) |  | (737,197 | ) |
| General and administrative expenses | (341,214 | ) |  | (144,987 | ) |  | (486,201 | ) |
| Underwriting income | $ | 78,635 |  |  | $ | 382,894 |  |  | 461,529 |  |
| Corporate expenses |  |  |  |  | (135,675 | ) |
| Net investment income |  |  |  |  | 342,766 |  |
| Net realized investment gains |  |  |  |  | 132,108 |  |
| Foreign exchange gains |  |  |  |  | 104,439 |  |
| Interest expense and financing costs |  |  |  |  | (74,695 | ) |
| Income before income taxes |  |  |  |  | $ | 830,472 |  |
| Net loss and loss expense ratio | 61.8 | % |  | 51.7 | % |  | 56.5 | % |
| Acquisition cost ratio | 15.2 | % |  | 22.5 | % |  | 19.0 | % |
| General and administrative expense ratio | 18.7 | % |  | 7.1 | % |  | 16.1 | % |
| Combined ratio | 95.7 | % |  | 81.3 | % |  | 91.6 | % |
| Goodwill and intangible assets | $ | 88,960 |  |  | $ | — |  |  | $ | 88,960 |  |
| At and year ended December 31, 2013 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 2,559,138 |  |  | $ | 2,137,903 |  |  | $ | 4,697,041 |  |
| Net premiums written | 1,813,538 |  |  | 2,114,662 |  |  | 3,928,200 |  |
| Net premiums earned | 1,722,762 |  |  | 1,984,303 |  |  | 3,707,065 |  |
| Other insurance related income | 2,436 |  |  | 1,988 |  |  | 4,424 |  |
| Net losses and loss expenses | (1,050,402 | ) |  | (1,083,793 | ) |  | (2,134,195 | ) |
| Acquisition costs | (242,363 | ) |  | (421,828 | ) |  | (664,191 | ) |
| General and administrative expenses | (347,684 | ) |  | (137,450 | ) |  | (485,134 | ) |
| Underwriting income | $ | 84,749 |  |  | $ | 343,220 |  |  | 427,969 |  |
| Corporate expenses |  |  |  |  | (90,256 | ) |
| Net investment income |  |  |  |  | 409,312 |  |
| Net realized investment gains |  |  |  |  | 75,564 |  |
| Foreign exchange losses |  |  |  |  | (26,143 | ) |
| Interest expense and financing costs |  |  |  |  | (61,979 | ) |
| Income before income taxes |  |  |  |  | $ | 734,467 |  |
| Net loss and loss expense ratio | 61.0 | % |  | 54.6 | % |  | 57.6 | % |
| Acquisition cost ratio | 14.1 | % |  | 21.3 | % |  | 17.9 | % |
| General and administrative expense ratio | 20.1 | % |  | 6.9 | % |  | 15.5 | % |
| Combined ratio | 95.2 | % |  | 82.8 | % |  | 91.0 | % |
| Goodwill and intangible assets | $ | 89,528 |  |  | $ | — |  |  | $ | 89,528 |  |
GROSS PREMIUMS WRITTEN BY GEOGRAPHICAL LOCATION OF SUBSIDIARIES | The following table presents our gross premiums written by the geographical location of our subsidiaries:
| Year ended December 31, | 2015 |  | 2014 |  | 2013 |
| Bermuda | $ | 525,226 |  |  | $ | 618,273 |  |  | $ | 718,904 |  |
| Europe | 1,714,405 |  |  | 1,784,139 |  |  | 1,699,748 |  |
| United States | 2,364,099 |  |  | 2,309,107 |  |  | 2,278,389 |  |
| Total gross premium written | $ | 4,603,730 |  |  | $ | 4,711,519 |  |  | $ | 4,697,041 |  |
NET PREMIUMS EARNED BY SEGMENT AND LINE OF BUSINESS | The following table presents our net premiums earned by segment and line of business:
| Year ended December 31, | 2015 |  | 2014 |  | 2013 |
| Insurance |  |  |  |  |  |
| Property | $ | 432,587 |  |  | $ | 444,197 |  |  | $ | 462,364 |  |
| Marine | 183,696 |  |  | 178,229 |  |  | 179,057 |  |
| Terrorism | 36,818 |  |  | 35,876 |  |  | 39,298 |  |
| Aviation | 45,659 |  |  | 41,192 |  |  | 48,489 |  |
| Credit and Political Risk | 63,583 |  |  | 63,095 |  |  | 68,192 |  |
| Professional Lines | 596,430 |  |  | 629,365 |  |  | 586,200 |  |
| Liability | 161,614 |  |  | 146,819 |  |  | 110,623 |  |
| Accident and Health | 277,804 |  |  | 291,771 |  |  | 228,539 |  |
| Total Insurance | 1,798,191 |  |  | 1,830,544 |  |  | 1,722,762 |  |
| Reinsurance |  |  |  |  |  |
| Catastrophe | 216,020 |  |  | 325,307 |  |  | 380,199 |  |
| Property | 306,083 |  |  | 312,443 |  |  | 350,970 |  |
| Professional Lines | 310,915 |  |  | 336,058 |  |  | 304,754 |  |
| Credit and Surety | 250,208 |  |  | 263,013 |  |  | 279,943 |  |
| Motor | 299,883 |  |  | 268,678 |  |  | 221,844 |  |
| Liability | 297,000 |  |  | 289,223 |  |  | 234,736 |  |
| Agriculture | 129,346 |  |  | 164,628 |  |  | 126,490 |  |
| Engineering | 61,043 |  |  | 61,143 |  |  | 66,243 |  |
| Other | 17,728 |  |  | 19,962 |  |  | 19,124 |  |
| Total Reinsurance | 1,888,226 |  |  | 2,040,455 |  |  | 1,984,303 |  |
| Total | $ | 3,686,417 |  |  | $ | 3,870,999 |  |  | $ | 3,707,065 |  |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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