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SEGMENT INFORMATION (DETAILS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
reportable_segment
Mar. 31, 2013
Dec. 31, 2013
Segment Information [Line Items]      
Number of reportable segments 2    
Net premiums earned $ 945,949 $ 874,039  
Other insurance related income 3,082 595  
Net losses and loss expenses (544,207) (438,414)  
Acquisition costs (172,036) (145,491)  
General and administrative expenses (152,729) (141,475)  
Net investment income 82,744 108,908  
Net realized investment gains 10,620 44,478  
Foreign exchange (losses) gains (4,233) 34,882  
Interest expense and financing costs (16,594) (15,834)  
Income before income taxes 152,596 321,688  
Net loss and loss expense ratio 57.50% 50.20%  
Acquisition cost ratio 18.20% 16.60%  
General and administrative expense ratio 16.20% 16.20%  
Combined ratio 91.90% 83.00%  
Goodwill and intangible assets 90,350 97,001 89,528
Operating Segments [Member]
      
Segment Information [Line Items]      
Gross premiums written 1,821,399 1,746,483  
Net premiums written 1,664,584 1,570,440  
Net premiums earned 945,949 874,039  
Other insurance related income 3,082 595  
Net losses and loss expenses (544,207) (438,414)  
Acquisition costs (172,036) (145,491)  
General and administrative expenses (124,022) (119,930)  
Underwriting income 108,766 170,799  
Operating Segments [Member] | Insurance [Member]
      
Segment Information [Line Items]      
Gross premiums written 601,721 596,715  
Net premiums written 456,692 432,681  
Net premiums earned 449,214 401,880  
Other insurance related income 0 595  
Net losses and loss expenses (279,423) (217,336)  
Acquisition costs (65,057) (57,261)  
General and administrative expenses (87,946) (86,889)  
Underwriting income 16,788 40,989  
Net loss and loss expense ratio 62.20% 54.10%  
Acquisition cost ratio 14.50% 14.20%  
General and administrative expense ratio 19.60% 21.60%  
Combined ratio 96.30% 89.90%  
Goodwill and intangible assets 90,350 97,001  
Operating Segments [Member] | Reinsurance [Member]
      
Segment Information [Line Items]      
Gross premiums written 1,219,678 1,149,768  
Net premiums written 1,207,892 1,137,759  
Net premiums earned 496,735 472,159  
Other insurance related income 3,082 0  
Net losses and loss expenses (264,784) (221,078)  
Acquisition costs (106,979) (88,230)  
General and administrative expenses (36,076) (33,041)  
Underwriting income 91,978 129,810  
Net loss and loss expense ratio 53.30% 46.80%  
Acquisition cost ratio 21.50% 18.70%  
General and administrative expense ratio 7.30% 7.00%  
Combined ratio 82.10% 72.50%  
Goodwill and intangible assets 0 0  
Corporate, Non-Segment [Member]
      
Segment Information [Line Items]      
General and administrative expenses (28,707) (21,545)  
Significant Reconciling Items [Member]
      
Segment Information [Line Items]      
Net investment income 82,744 108,908  
Net realized investment gains 10,620 44,478  
Foreign exchange (losses) gains (4,233) 34,882  
Interest expense and financing costs $ (16,594) $ (15,834)