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SEGMENT INFORMATION (DETAILS) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
reportable_segment
Sep. 30, 2013
Dec. 31, 2013
Segment Information [Line Items]          
Number of reportable segments     2    
Net premiums earned $ 966,138 $ 945,242 $ 2,912,482 $ 2,765,154  
Other insurance related income 7,702 725 12,468 1,756  
Net losses and loss expenses (552,064) (501,522) (1,662,097) (1,582,835)  
Acquisition costs (185,950) (173,682) (549,848) (488,892)  
General and administrative expenses (152,916) (140,699) (456,725) (431,207)  
Net investment income 66,562 103,429 264,171 295,450  
Net realized investment gains (losses) 77,448 (4,708) 121,329 56,004  
Foreign exchange (losses) gains 72,292 (56,860) 58,353 (11,659)  
Interest expense and financing costs (20,344) (15,260) (56,913) (46,355)  
Income before income taxes 278,868 156,665 643,220 557,416  
Net loss and loss expense ratio 57.10% 53.10% 57.10% 57.20%  
Acquisition cost ratio 19.20% 18.40% 18.90% 17.70%  
General and administrative expense ratio 15.90% 14.80% 15.60% 15.60%  
Combined ratio 92.20% 86.30% 91.60% 90.50%  
Goodwill and intangible assets 88,740 91,656 88,740 91,656 89,528
Operating Segments [Member]
          
Segment Information [Line Items]          
Gross premiums written 896,814 904,797 3,949,479 3,871,085  
Net premiums written 687,223 716,389 3,351,958 3,280,236  
Net premiums earned 966,138 945,242 2,912,482 2,765,154  
Other insurance related income 7,702 725 12,468 1,756  
Net losses and loss expenses (552,064) (501,522) (1,662,097) (1,582,835)  
Acquisition costs (185,950) (173,682) (549,848) (488,892)  
General and administrative expenses (122,362) (117,675) (364,195) (361,373)  
Underwriting income 113,464 153,088 348,810 333,810  
Operating Segments [Member] | Insurance [Member]
          
Segment Information [Line Items]          
Gross premiums written 555,283 574,778 1,911,102 1,952,548  
Net premiums written 363,571 393,627 1,361,351 1,385,892  
Net premiums earned 461,805 448,072 1,368,683 1,272,297  
Other insurance related income 0 725 0 1,756  
Net losses and loss expenses (289,207) (216,440) (859,093) (764,768)  
Acquisition costs (71,264) (61,087) (207,360) (177,097)  
General and administrative expenses (85,750) (82,548) (257,208) (257,962)  
Underwriting income 15,584 88,722 45,022 74,226  
Net loss and loss expense ratio 62.60% 48.30% 62.80% 60.10%  
Acquisition cost ratio 15.40% 13.60% 15.20% 13.90%  
General and administrative expense ratio 18.60% 18.50% 18.70% 20.30%  
Combined ratio 96.60% 80.40% 96.70% 94.30%  
Goodwill and intangible assets 88,740 91,656 88,740 91,656  
Operating Segments [Member] | Reinsurance [Member]
          
Segment Information [Line Items]          
Gross premiums written 341,531 330,019 2,038,377 1,918,537  
Net premiums written 323,652 322,762 1,990,607 1,894,344  
Net premiums earned 504,333 497,170 1,543,799 1,492,857  
Other insurance related income 7,702 0 12,468 0  
Net losses and loss expenses (262,857) (285,082) (803,004) (818,067)  
Acquisition costs (114,686) (112,595) (342,488) (311,795)  
General and administrative expenses (36,612) (35,127) (106,987) (103,411)  
Underwriting income 97,880 64,366 303,788 259,584  
Net loss and loss expense ratio 52.10% 57.30% 52.00% 54.80%  
Acquisition cost ratio 22.70% 22.60% 22.20% 20.90%  
General and administrative expense ratio 7.30% 7.20% 6.90% 6.90%  
Combined ratio 82.10% 87.10% 81.10% 82.60%  
Goodwill and intangible assets 0 0 0 0  
Corporate, Non-Segment [Member]
          
Segment Information [Line Items]          
General and administrative expenses (30,554) (23,024) (92,530) (69,834)  
Significant Reconciling Items [Member]
          
Segment Information [Line Items]          
Net investment income 66,562 103,429 264,171 295,450  
Net realized investment gains (losses) 77,448 (4,708) 121,329 56,004  
Foreign exchange (losses) gains 72,292 (56,860) 58,353 (11,659)  
Interest expense and financing costs $ (20,344) $ (15,260) $ (56,913) $ (46,355)