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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year reserve development by segment, reserving class and accident year (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years $ 15,909 $ 78,900 $ 199,662
Insurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 8,937 53,302 92,806
Insurance | Property and other      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 46,791 11,042 64,781
Insurance | Marine      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 16,780 33,260 17,913
Insurance | Aviation      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 6,416 3,741 (2,938)
Insurance | Credit and political risk      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (745) 18,810 3,609
Insurance | Professional lines      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (35,661) 11,721 31,687
Insurance | Liability      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (24,644) (25,272) (22,246)
Reinsurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 6,972 25,598 106,856
Reinsurance | Property and other      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (5,935) (133,448) 6,012
Reinsurance | Professional lines      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (15,352) 3,668 21,310
Reinsurance | Liability      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years (29,656) 31,283 23,105
Reinsurance | Credit and surety      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years 36,829 53,223 33,497
Reinsurance | Motor      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior years $ 21,086 $ 70,872 $ 22,932