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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
reportable_segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment Information [Line Items]          
Number of reportable segments | reportable_segment     2    
Net premiums earned $ 1,017,131 $ 934,415 $ 2,937,265 $ 2,783,746  
Other insurance related income (losses) (3,197) 5,944 (4,420) 4,850  
Net losses and loss expenses (1,235,367) (532,328) (2,447,640) (1,663,584)  
Acquisition costs (194,724) (189,810) (588,879) (559,570)  
Expenses (124,629) (142,906) (433,704) (439,554)  
Net investment income 95,169 116,923 299,899 257,818  
Net realized investment gains 14,632 5,205 (14,811) (40,295)  
Foreign exchange (losses) gains (32,510) 13,795 (90,093) 69,781  
Interest expense and financing costs (12,835) (12,839) (38,377) (38,586)  
Bargain purchase gain 0 0 15,044 0  
Transaction related expenses 5,970 0 5,970 0  
Income (loss) before income taxes and interest in income (loss) of equity method investments $ (482,300) $ 198,399 $ (371,686) $ 374,606  
Net loss and loss expense ratio 121.50% 57.00% 83.30% 59.80%  
Acquisition cost ratio 19.10% 20.30% 20.00% 20.10%  
General and administrative expense ratio 12.30% 15.30% 14.80% 15.80%  
Combined ratio 152.90% 92.60% 118.10% 95.70%  
Goodwill and intangible assets $ 87,206 $ 85,501 $ 87,206 $ 85,501 $ 85,049
Operating Segments [Member]          
Segment Information [Line Items]          
Gross premiums written 1,185,574 959,962 4,459,772 4,239,558  
Net premiums written 832,743 595,431 3,297,718 3,288,587  
Net premiums earned 1,017,131 934,415 2,937,265 2,783,746  
Other insurance related income (losses) (3,197) 5,944 (4,420) 4,850  
Net losses and loss expenses (1,235,367) (532,328) (2,447,640) (1,663,584)  
Acquisition costs (194,724) (189,810) (588,879) (559,570)  
Expenses (96,696) (114,223) (335,782) (352,632)  
Underwriting income (loss) (512,853) 103,998 (439,456) 212,810  
Operating Segments [Member] | Insurance [Member]          
Segment Information [Line Items]          
Gross premiums written 744,366 675,430 2,234,395 2,112,796  
Net premiums written 500,022 433,131 1,533,029 1,433,058  
Net premiums earned 496,004 444,691 1,448,270 1,322,649  
Other insurance related income (losses) 526 39 1,077 (57)  
Net losses and loss expenses (628,865) (273,226) (1,241,495) (853,771)  
Acquisition costs (74,231) (61,755) (223,665) (184,982)  
Expenses (75,038) (84,588) (253,308) (252,652)  
Underwriting income (loss) $ (281,604) $ 25,161 $ (269,121) $ 31,187  
Net loss and loss expense ratio 126.80% 61.40% 85.70% 64.60%  
Acquisition cost ratio 15.00% 13.90% 15.40% 14.00%  
General and administrative expense ratio 15.10% 19.10% 17.60% 19.00%  
Combined ratio 156.90% 94.40% 118.70% 97.60%  
Goodwill and intangible assets $ 87,206 $ 85,501 $ 87,206 $ 85,501  
Operating Segments [Member] | Reinsurance [Member]          
Segment Information [Line Items]          
Gross premiums written 441,208 284,532 2,225,377 2,126,762  
Net premiums written 332,721 162,300 1,764,689 1,855,529  
Net premiums earned 521,127 489,724 1,488,995 1,461,097  
Other insurance related income (losses) (3,723) 5,905 (5,497) 4,907  
Net losses and loss expenses (606,502) (259,102) (1,206,145) (809,813)  
Acquisition costs (120,493) (128,055) (365,214) (374,588)  
Expenses (21,658) (29,635) (82,474) (99,980)  
Underwriting income (loss) $ (231,249) $ 78,837 $ (170,335) $ 181,623  
Net loss and loss expense ratio 116.40% 52.90% 81.00% 55.40%  
Acquisition cost ratio 23.10% 26.10% 24.50% 25.60%  
General and administrative expense ratio 4.20% 6.10% 5.60% 6.90%  
Combined ratio 143.70% 85.10% 111.10% 87.90%  
Goodwill and intangible assets $ 0 $ 0 $ 0 $ 0  
Corporate, Non-Segment [Member]          
Segment Information [Line Items]          
Expenses (27,933) (28,683) (97,922) (86,922)  
Significant Reconciling Items [Member]          
Segment Information [Line Items]          
Net investment income 95,169 116,923 299,899 257,818  
Net realized investment gains 14,632 5,205 (14,811) (40,295)  
Foreign exchange (losses) gains (32,510) 13,795 (90,093) 69,781  
Interest expense and financing costs (12,835) (12,839) (38,377) (38,586)  
Bargain purchase gain     15,044 0  
Transaction related expenses $ 5,970 $ 0 $ 5,970 $ 0