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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
reportable_segment
Mar. 31, 2017
USD ($)
Segment Information [Line Items]    
Number of reportable segments | reportable_segment 2  
Net premiums earned $ 1,167,402 $ 938,703
Other insurance related income (losses) 6,606 (3,783)
Net losses and loss expenses (661,345) (606,942)
Acquisition costs (229,260) (189,792)
Expenses (169,837) (161,260)
Net investment income 100,999 98,664
Net investment losses (14,830) (25,050)
Foreign exchange losses (37,860) (21,465)
Interest expense and financing costs (16,763) (12,791)
Reorganization expenses (13,054) 0
Amortization of value of business acquired (57,110) 0
Amortization of intangibles (2,782) 0
Income before income taxes and interest in income (loss) of equity method investments $ 72,166 $ 16,284
Net loss and loss expense ratio 56.70% 64.70%
Acquisition cost ratio 19.60% 20.20%
General and administrative expense ratio 14.50% 17.20%
Combined ratio 90.80% 102.10%
Goodwill $ 506,747 $ 84,613
Operating Segments    
Segment Information [Line Items]    
Gross premiums written 2,662,795 1,911,871
Net premiums written 1,985,871 1,508,959
Net premiums earned 1,167,402 938,703
Other insurance related income (losses) 6,606 (3,783)
Net losses and loss expenses (661,345) (606,942)
Acquisition costs (229,260) (189,792)
Expenses (139,666) (121,801)
Underwriting income 143,737 16,385
Operating Segments | Insurance    
Segment Information [Line Items]    
Gross premiums written 880,848 545,261
Net premiums written 547,893 356,836
Net premiums earned 580,059 391,964
Other insurance related income (losses) 620 42
Net losses and loss expenses (321,538) (241,085)
Acquisition costs (87,329) (54,004)
Expenses (102,370) (85,256)
Underwriting income $ 69,442 $ 11,661
Net loss and loss expense ratio 55.40% 61.50%
Acquisition cost ratio 15.10% 13.80%
General and administrative expense ratio 17.60% 21.80%
Combined ratio 88.10% 97.00%
Goodwill $ 506,747 $ 84,613
Operating Segments | Reinsurance    
Segment Information [Line Items]    
Gross premiums written 1,781,947 1,366,610
Net premiums written 1,437,978 1,152,122
Net premiums earned 587,343 546,739
Other insurance related income (losses) 5,986 (3,825)
Net losses and loss expenses (339,807) (365,857)
Acquisition costs (141,931) (135,788)
Expenses (37,296) (36,545)
Underwriting income $ 74,295 $ 4,724
Net loss and loss expense ratio 57.90% 66.90%
Acquisition cost ratio 24.20% 24.80%
General and administrative expense ratio 6.30% 6.70%
Combined ratio 88.40% 98.40%
Goodwill $ 0 $ 0
Corporate, Non-Segment    
Segment Information [Line Items]    
Expenses (30,171) (39,459)
Significant Reconciling Items    
Segment Information [Line Items]    
Net investment income 100,999 98,664
Net investment losses (14,830) (25,050)
Foreign exchange losses (37,860) (21,465)
Interest expense and financing costs (16,763) (12,791)
Reorganization expenses (13,054) 0
Amortization of value of business acquired (57,110) 0
Amortization of intangibles $ (2,782) $ 0