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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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years $ 5,317 $ 6,113
Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 1,505 3,832
Insurance | Property and other    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 15,391 12,491
Insurance | Marine    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 11,875 (2,202)
Insurance | Aviation    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 1,035 3,991
Insurance | Credit and political risk    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (5,371) (916)
Insurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (14,593) (5,087)
Insurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (6,832) (4,445)
Reinsurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 3,812 2,281
Reinsurance | Property and other    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years 969 (3,905)
Reinsurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (2,204) 5,162
Reinsurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (7,154) (16,915)
Reinsurance | Credit and surety    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years (4,939) 4,854
Reinsurance | Motor    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years $ 17,140 $ 13,085