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SEGMENT INFORMATION (DETAILS)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
reportable_segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Information [Line Items]      
Number of reportable segments | reportable_segment 2    
Net premiums earned $ 902,340 $ 904,053  
Other insurance related income (losses) (203) 7,676  
Net losses and loss expenses (498,962) (512,328)  
Acquisition costs (180,635) (171,542)  
General and administrative expenses (149,901) (163,241)  
Net investment income 49,164 92,107  
Net realized investment losses (66,508) (42,553)  
Foreign exchange (losses) gains (616) 63,220  
Interest expense and financing costs (12,833) (12,257)  
Income before income taxes $ 41,846 $ 165,135  
Net loss and loss expense ratio 55.30% 56.70%  
Acquisition cost ratio 20.00% 19.00%  
General and administrative expense ratio 16.60% 18.00%  
Combined ratio 91.90% 93.70%  
Goodwill and intangible assets $ 86,446 $ 88,508 $ 86,858
Operating Segments [Member]      
Segment Information [Line Items]      
Gross premiums written 1,959,161 1,678,932  
Net premiums written 1,685,806 1,455,546  
Net premiums earned 902,340 904,053  
Other insurance related income (losses) (203) 7,676  
Net losses and loss expenses (498,962) (512,328)  
Acquisition costs (180,635) (171,542)  
General and administrative expenses (123,589) (127,069)  
Underwriting income 98,951 100,790  
Operating Segments [Member] | Insurance [Member]      
Segment Information [Line Items]      
Gross premiums written 653,349 602,724  
Net premiums written 473,163 436,740  
Net premiums earned 438,678 447,467  
Other insurance related income (losses) 137 0  
Net losses and loss expenses (274,405) (285,773)  
Acquisition costs (61,398) (64,455)  
General and administrative expenses (85,576) (87,689)  
Underwriting income $ 17,436 $ 9,550  
Net loss and loss expense ratio 62.60% 63.90%  
Acquisition cost ratio 14.00% 14.40%  
General and administrative expense ratio 19.50% 19.60%  
Combined ratio 96.10% 97.90%  
Goodwill and intangible assets $ 86,446 $ 88,508  
Operating Segments [Member] | Reinsurance [Member]      
Segment Information [Line Items]      
Gross premiums written 1,305,812 1,076,208  
Net premiums written 1,212,643 1,018,806  
Net premiums earned 463,662 456,586  
Other insurance related income (losses) (340) 7,676  
Net losses and loss expenses (224,557) (226,555)  
Acquisition costs (119,237) (107,087)  
General and administrative expenses (38,013) (39,380)  
Underwriting income $ 81,515 $ 91,240  
Net loss and loss expense ratio 48.40% 49.60%  
Acquisition cost ratio 25.70% 23.50%  
General and administrative expense ratio 8.20% 8.60%  
Combined ratio 82.30% 81.70%  
Goodwill and intangible assets $ 0 $ 0  
Corporate, Non-Segment [Member]      
Segment Information [Line Items]      
General and administrative expenses (26,312) (36,172)  
Significant Reconciling Items [Member]      
Segment Information [Line Items]      
Net investment income 49,164 92,107  
Net realized investment losses (66,508) (42,553)  
Foreign exchange (losses) gains (616) 63,220  
Interest expense and financing costs $ (12,833) $ (12,257)