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SEGMENT INFORMATION (DETAILS) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) reportable_segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | reportable_segment |  |  |  |  |  |  |  |  | 2 |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 4,603,730 | $ 4,711,519 | $ 4,697,041
Net premiums written |  |  |  |  |  |  |  |  | 3,674,666 | 3,906,975 | 3,928,200
Net premiums earned | $ 921,812 | $ 919,341 | $ 941,211 | $ 904,053 | $ 958,517 | $ 966,138 | $ 1,000,400 | $ 945,949 | 3,686,417 | 3,870,999 | 3,707,065
Other insurance related income (loss) |  |  |  |  |  |  |  |  | (2,953) | 650 | 4,424
Net losses and loss expenses |  |  |  |  |  |  |  |  | (2,176,199) | (2,186,722) | (2,134,195)
Acquisition costs |  |  |  |  |  |  |  |  | (718,112) | (737,197) | (664,191)
General and administrative expenses |  |  |  |  |  |  |  |  | (596,821) | (621,876) | (575,390)
Underwriting income | 88,358 | 56,245 | 56,848 | 100,790 | 112,720 | 113,464 | 126,581 | 108,766 |  |  |
Net investment income | 79,000 | 45,685 | 88,544 | 92,107 | 78,595 | 66,562 | 114,867 | 82,744 | 305,336 | 342,766 | 409,312
Net realized investment gains (losses) | (14,872) | $ (69,957) | $ (11,110) | $ (42,553) | 10,779 | $ 77,448 | $ 33,261 | $ 10,620 | (138,491) | 132,108 | 75,564
Foreign exchange (losses) gains |  |  |  |  |  |  |  |  | 102,312 | 104,439 | (26,143)
Interest expense and financing costs |  |  |  |  |  |  |  |  | (50,963) | (74,695) | (61,979)
Termination fee received |  |  |  |  |  |  |  |  | 280,000 | 0 | 0
Reorganization and related expenses |  |  |  |  |  |  |  |  | (45,867) | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | $ 644,659 | $ 830,472 | $ 734,467
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 59.00% | 56.50% | 57.60%
Acquisition cost ratio |  |  |  |  |  |  |  |  | 19.50% | 19.00% | 17.90%
General and administrative expense ratio |  |  |  |  |  |  |  |  | 16.20% | 16.10% | 15.50%
Combined ratio |  |  |  |  |  |  |  |  | 94.70% | 91.60% | 91.00%
Goodwill and intangible assets | 86,858 |  |  |  | 88,960 |  |  |  | $ 86,858 | $ 88,960 | $ 89,528
Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,798,191 | 1,830,544 | 1,722,762
Reinsurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 1,888,226 | 2,040,455 | 1,984,303
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 4,603,730 | 4,711,519 | 4,697,041
Net premiums written |  |  |  |  |  |  |  |  | 3,674,666 | 3,906,975 | 3,928,200
Net premiums earned |  |  |  |  |  |  |  |  | 3,686,417 | 3,870,999 | 3,707,065
Other insurance related income (loss) |  |  |  |  |  |  |  |  | (2,953) | 650 | 4,424
Net losses and loss expenses |  |  |  |  |  |  |  |  | (2,176,199) | (2,186,722) | (2,134,195)
Acquisition costs |  |  |  |  |  |  |  |  | (718,112) | (737,197) | (664,191)
General and administrative expenses |  |  |  |  |  |  |  |  | (486,911) | (486,201) | (485,134)
Underwriting income |  |  |  |  |  |  |  |  | 302,242 | 461,529 | 427,969
Operating Segments [Member] | Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 2,583,081 | 2,535,415 | 2,559,138
Net premiums written |  |  |  |  |  |  |  |  | 1,759,359 | 1,779,501 | 1,813,538
Net premiums earned |  |  |  |  |  |  |  |  | 1,798,191 | 1,830,544 | 1,722,762
Other insurance related income (loss) |  |  |  |  |  |  |  |  | 1,036 | (11) | 2,436
Net losses and loss expenses |  |  |  |  |  |  |  |  | (1,154,928) | (1,131,880) | (1,050,402)
Acquisition costs |  |  |  |  |  |  |  |  | (261,208) | (278,804) | (242,363)
General and administrative expenses |  |  |  |  |  |  |  |  | (341,658) | (341,214) | (347,684)
Underwriting income |  |  |  |  |  |  |  |  | $ 41,433 | $ 78,635 | $ 84,749
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 64.20% | 61.80% | 61.00%
Acquisition cost ratio |  |  |  |  |  |  |  |  | 14.50% | 15.20% | 14.10%
General and administrative expense ratio |  |  |  |  |  |  |  |  | 19.10% | 18.70% | 20.10%
Combined ratio |  |  |  |  |  |  |  |  | 97.80% | 95.70% | 95.20%
Goodwill and intangible assets | 86,858 |  |  |  | 88,960 |  |  |  | $ 86,858 | $ 88,960 | $ 89,528
Operating Segments [Member] | Reinsurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | 2,020,649 | 2,176,104 | 2,137,903
Net premiums written |  |  |  |  |  |  |  |  | 1,915,307 | 2,127,474 | 2,114,662
Net premiums earned |  |  |  |  |  |  |  |  | 1,888,226 | 2,040,455 | 1,984,303
Other insurance related income (loss) |  |  |  |  |  |  |  |  | (3,989) | 661 | 1,988
Net losses and loss expenses |  |  |  |  |  |  |  |  | (1,021,271) | (1,054,842) | (1,083,793)
Acquisition costs |  |  |  |  |  |  |  |  | (456,904) | (458,393) | (421,828)
General and administrative expenses |  |  |  |  |  |  |  |  | (145,253) | (144,987) | (137,450)
Underwriting income |  |  |  |  |  |  |  |  | $ 260,809 | $ 382,894 | $ 343,220
Net loss and loss expense ratio |  |  |  |  |  |  |  |  | 54.10% | 51.70% | 54.60%
Acquisition cost ratio |  |  |  |  |  |  |  |  | 24.20% | 22.50% | 21.30%
General and administrative expense ratio |  |  |  |  |  |  |  |  | 7.70% | 7.10% | 6.90%
Combined ratio |  |  |  |  |  |  |  |  | 86.00% | 81.30% | 82.80%
Goodwill and intangible assets | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | (109,910) | (135,675) | (90,256)
Significant Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 305,336 | 342,766 | 409,312
Net realized investment gains (losses) |  |  |  |  |  |  |  |  | (138,491) | 132,108 | 75,564
Foreign exchange (losses) gains |  |  |  |  |  |  |  |  | 102,312 | 104,439 | (26,143)
Interest expense and financing costs |  |  |  |  |  |  |  |  | (50,963) | $ (74,695) | $ (61,979)
Termination fee received |  |  |  |  |  |  |  |  | 280,000 |  |
Reorganization and related expenses |  |  |  |  |  |  |  |  | $ (45,867) |  |

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