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SEGMENT INFORMATION (DETAILS)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
reportable_segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Information [Line Items]          
Number of reportable segments | reportable_segment     2    
Net premiums earned $ 934,415 $ 919,341 $ 2,783,746 $ 2,764,605  
Other insurance related income (loss) 5,944 1,158 4,850 12,319  
Net losses and loss expenses (532,328) (560,387) (1,663,584) (1,652,868)  
Acquisition costs (189,810) (182,744) (559,570) (537,549)  
Expenses (142,906) (144,727) (439,554) (456,451)  
Net investment income 116,923 45,685 257,818 226,336  
Net realized investment gains (losses) 5,205 (69,957) (40,295) (123,618)  
Foreign exchange gains 13,795 28,088 69,781 69,200  
Interest expense and financing costs (12,839) (12,918) (38,586) (38,114)  
Termination fee received 0 280,000 0 280,000  
Reorganization and related expenses 0 (45,867) 0 (45,867)  
Income before income taxes and interest in income (loss) of equity method investments $ 198,399 $ 257,672 $ 374,606 $ 497,993  
Net loss and loss expense ratio 57.00% 61.00% 59.80% 59.80%  
Acquisition cost ratio 20.30% 19.90% 20.10% 19.40%  
General and administrative expense ratio 15.30% 15.70% 15.80% 16.50%  
Combined ratio 92.60% 96.60% 95.70% 95.70%  
Goodwill and intangible assets $ 85,501 $ 87,329 $ 85,501 $ 87,329 $ 86,858
Operating Segments [Member]          
Segment Information [Line Items]          
Gross premiums written 959,962 936,583 4,239,558 3,803,928  
Net premiums written 595,431 677,217 3,288,587 3,079,307  
Net premiums earned 934,415 919,341 2,783,746 2,764,605  
Other insurance related income (loss) 5,944 1,158 4,850 12,319  
Net losses and loss expenses (532,328) (560,387) (1,663,584) (1,652,868)  
Acquisition costs (189,810) (182,744) (559,570) (537,549)  
Expenses (114,223) (121,123) (352,632) (372,625)  
Underwriting income 103,998 56,245 212,810 213,882  
Operating Segments [Member] | Insurance [Member]          
Segment Information [Line Items]          
Gross premiums written 675,430 606,704 2,112,796 1,970,554  
Net premiums written 433,131 381,118 1,433,058 1,352,122  
Net premiums earned 444,691 444,550 1,322,649 1,344,339  
Other insurance related income (loss)     (57)    
Other insurance related income (loss) 39 542   811  
Net losses and loss expenses (273,226) (283,272) (853,771) (866,580)  
Acquisition costs (61,755) (69,118) (184,982) (200,493)  
Expenses (84,588) (85,814) (252,652) (261,924)  
Underwriting income $ 25,161 $ 6,888 $ 31,187 $ 16,153  
Net loss and loss expense ratio 61.40% 63.70% 64.60% 64.50%  
Acquisition cost ratio 13.90% 15.50% 14.00% 14.90%  
General and administrative expense ratio 19.10% 19.40% 19.00% 19.50%  
Combined ratio 94.40% 98.60% 97.60% 98.90%  
Goodwill and intangible assets $ 85,501 $ 87,329 $ 85,501 $ 87,329  
Operating Segments [Member] | Reinsurance [Member]          
Segment Information [Line Items]          
Gross premiums written 284,532 329,879 2,126,762 1,833,374  
Net premiums written 162,300 296,099 1,855,529 1,727,185  
Net premiums earned 489,724 474,791 1,461,097 1,420,266  
Other insurance related income (loss) 5,905 616 4,907 11,508  
Net losses and loss expenses (259,102) (277,115) (809,813) (786,288)  
Acquisition costs (128,055) (113,626) (374,588) (337,056)  
Expenses (29,635) (35,309) (99,980) (110,701)  
Underwriting income $ 78,837 $ 49,357 $ 181,623 $ 197,729  
Net loss and loss expense ratio 52.90% 58.40% 55.40% 55.40%  
Acquisition cost ratio 26.10% 23.90% 25.60% 23.70%  
General and administrative expense ratio 6.10% 7.40% 6.90% 7.80%  
Combined ratio 85.10% 89.70% 87.90% 86.90%  
Goodwill and intangible assets $ 0 $ 0 $ 0 $ 0  
Corporate, Non-Segment [Member]          
Segment Information [Line Items]          
Expenses (28,683) (23,604) (86,922) (83,826)  
Significant Reconciling Items [Member]          
Segment Information [Line Items]          
Net investment income 116,923 45,685 257,818 226,336  
Net realized investment gains (losses) 5,205 (69,957) (40,295) (123,618)  
Foreign exchange gains 13,795 28,088 69,781 69,200  
Interest expense and financing costs (12,839) (12,918) (38,586) (38,114)  
Termination fee received 0 280,000 0 280,000  
Reorganization and related expenses $ 0 $ (45,867) $ 0 $ (45,867)