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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
reportable_segment
Mar. 31, 2020
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | reportable_segment 2  
Segment Information [Line Items]    
Net premiums earned $ 1,103,722 $ 1,088,625
Other insurance related income (loss) 2,781 (8,707)
Net losses and loss expenses (714,718) (908,073)
Acquisition costs (218,871) (238,650)
Expenses (158,408) (157,060)
Net investment income 114,165 93,101
Net investment gains (losses) 29,645 (62,877)
Foreign exchange (losses) gains (4,113) 61,683
Interest expense and financing costs (15,571) (23,472)
Reorganization expenses 0 982
Amortization of value of business acquired (1,028) (1,799)
Amortization of intangible assets (2,690) (2,870)
Income (loss) before income taxes and interest in income (loss) of equity method investments 134,914 (159,117)
Operating Segments    
Segment Information [Line Items]    
Gross premiums written 2,535,481 2,431,158
Net premiums written 1,778,886 1,679,044
Net premiums earned 1,103,722 1,088,625
Other insurance related income (loss) 2,781 (8,707)
Net losses and loss expenses (714,718) (908,073)
Acquisition costs (218,871) (238,650)
Expenses (132,668) (129,962)
Underwriting income (loss) $ 40,246 $ (196,767)
Net losses and loss expenses ratio 64.80% 83.40%
Acquisition cost ratio 19.80% 21.90%
General and administrative expense ratio 14.30% 14.50%
Combined ratio 98.90% 119.80%
Goodwill and intangible assets $ 317,705 $ 329,824
Operating Segments | Insurance    
Segment Information [Line Items]    
Gross premiums written 1,103,198 940,715
Net premiums written 707,814 581,650
Net premiums earned 616,286 562,064
Other insurance related income (loss) 415 647
Net losses and loss expenses (356,898) (471,812)
Acquisition costs (117,679) (112,751)
Expenses (103,303) (100,778)
Underwriting income (loss) $ 38,821 $ (122,630)
Net losses and loss expenses ratio 57.90% 83.90%
Acquisition cost ratio 19.10% 20.10%
General and administrative expense ratio 16.80% 17.90%
Combined ratio 93.80% 121.90%
Goodwill and intangible assets $ 317,705 $ 329,824
Operating Segments | Reinsurance    
Segment Information [Line Items]    
Gross premiums written 1,432,283 1,490,443
Net premiums written 1,071,072 1,097,394
Net premiums earned 487,436 526,561
Other insurance related income (loss) 2,366 (9,354)
Net losses and loss expenses (357,820) (436,261)
Acquisition costs (101,192) (125,899)
Expenses (29,365) (29,184)
Underwriting income (loss) $ 1,425 $ (74,137)
Net losses and loss expenses ratio 73.40% 82.90%
Acquisition cost ratio 20.80% 23.90%
General and administrative expense ratio 6.00% 5.50%
Combined ratio 100.20% 112.30%
Goodwill and intangible assets $ 0 $ 0
Corporate Expenses    
Segment Information [Line Items]    
Expenses (25,740) (27,098)
Segment Reconciling Items    
Segment Information [Line Items]    
Net investment income 114,165 93,101
Net investment gains (losses) 29,645 (62,877)
Foreign exchange (losses) gains (4,113) 61,683
Interest expense and financing costs (15,571) (23,472)
Reorganization expenses 0 982
Amortization of value of business acquired (1,028) (1,799)
Amortization of intangible assets $ (2,690) $ (2,870)