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SEGMENT INFORMATION (TABLES) | 12 Months Ended
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Dec. 31, 2016
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, 2016 | Insurance |  | Reinsurance |  | Total |
| Gross premiums written | $ | 2,720,242 |  |  | $ | 2,249,966 |  |  | $ | 4,970,208 |  |
| Net premiums written | 1,807,125 |  |  | 1,945,849 |  |  | 3,752,974 |  |
| Net premiums earned | 1,777,321 |  |  | 1,928,304 |  |  | 3,705,625 |  |
| Other insurance related income | 89 |  |  | 7,133 |  |  | 7,222 |  |
| Net losses and loss expenses | (1,141,933 | ) |  | (1,062,264 | ) |  | (2,204,197 | ) |
| Acquisition costs | (251,120 | ) |  | (495,756 | ) |  | (746,876 | ) |
| General and administrative expenses | (346,857 | ) |  | (135,844 | ) |  | (482,701 | ) |
| Underwriting income | $ | 37,500 |  |  | $ | 241,573 |  |  | 279,073 |  |
| Corporate expenses |  |  |  |  | (120,016 | ) |
| Net investment income |  |  |  |  | 353,335 |  |
| Net realized investment losses |  |  |  |  | (60,525 | ) |
| Foreign exchange gains |  |  |  |  | 121,295 |  |
| Interest expense and financing costs |  |  |  |  | (51,360 | ) |
| Income before income taxes and interest in income (loss) of equity method investments |  |  |  |  | $ | 521,802 |  |
| Net loss and loss expense ratio | 64.3 | % |  | 55.1 | % |  | 59.5 | % |
| Acquisition cost ratio | 14.1 | % |  | 25.7 | % |  | 20.2 | % |
| General and administrative expense ratio | 19.5 | % |  | 7.0 | % |  | 16.2 | % |
| Combined ratio | 97.9 | % |  | 87.8 | % |  | 95.9 | % |
| Goodwill and intangible assets | $ | 85,049 |  |  | $ | — |  |  | $ | 85,049 |  |
| 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 loss |  |  |  |  | (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 and interest in income (loss) of equity method investments |  |  |  |  | $ | 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 and interest in income (loss) of equity method investments |  |  |  |  | $ | 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 |  |
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, | 2016 |  | 2015 |  | 2014 |
| Bermuda | $ | 465,980 |  |  | $ | 525,226 |  |  | $ | 618,273 |  |
| Ireland | 1,650,229 |  |  | 1,532,753 |  |  | 1,641,767 |  |
| U.S. | 2,562,789 |  |  | 2,364,099 |  |  | 2,309,107 |  |
| Other | 291,210 |  |  | 181,652 |  |  | 142,372 |  |
| Total gross premium written | $ | 4,970,208 |  |  | $ | 4,603,730 |  |  | $ | 4,711,519 |  |
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, | 2016 |  | 2015 |  | 2014 |
| Insurance |  |  |  |  |  |
| Property | $ | 426,918 |  |  | $ | 432,587 |  |  | $ | 444,197 |  |
| Marine | 150,046 |  |  | 183,696 |  |  | 178,229 |  |
| Terrorism | 33,279 |  |  | 36,818 |  |  | 35,876 |  |
| Aviation | 44,980 |  |  | 45,659 |  |  | 41,192 |  |
| Credit and Political Risk | 57,964 |  |  | 63,583 |  |  | 63,095 |  |
| Professional Lines | 510,806 |  |  | 596,430 |  |  | 629,365 |  |
| Liability | 169,182 |  |  | 161,614 |  |  | 146,819 |  |
| Accident and Health | 384,146 |  |  | 277,804 |  |  | 291,771 |  |
| Total Insurance | 1,777,321 |  |  | 1,798,191 |  |  | 1,830,544 |  |
| Reinsurance |  |  |  |  |  |
| Catastrophe | 199,825 |  |  | 216,020 |  |  | 325,307 |  |
| Property | 272,403 |  |  | 306,083 |  |  | 312,443 |  |
| Professional Lines | 289,868 |  |  | 310,915 |  |  | 336,058 |  |
| Credit and Surety | 252,210 |  |  | 250,208 |  |  | 263,013 |  |
| Motor | 318,863 |  |  | 299,883 |  |  | 268,678 |  |
| Liability | 332,479 |  |  | 297,000 |  |  | 289,223 |  |
| Agriculture | 142,501 |  |  | 129,346 |  |  | 164,628 |  |
| Engineering | 62,833 |  |  | 61,043 |  |  | 61,143 |  |
| Marine and Other | 57,322 |  |  | 17,728 |  |  | 19,962 |  |
| Total Reinsurance | 1,928,304 |  |  | 1,888,226 |  |  | 2,040,455 |  |
| Total | $ | 3,705,625 |  |  | $ | 3,686,417 |  |  | $ | 3,870,999 |  |

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