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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 11,012 $ 584 $ 23,138 $ 9,351
Insurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 5,418 270 13,351 4,521
Insurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 12,486 6,907 63,167 42,688
Insurance | Marine        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 4,189 4,095 23,411 633
Insurance | Aviation        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 3,958 (326) 9,802 5,667
Insurance | Credit and political risk        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 7,610 871 6,294 (223)
Insurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (20,759) (7,287) (68,405) (19,086)
Insurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (2,066) (3,990) (20,918) (25,158)
Reinsurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 5,594 314 9,787 4,830
Reinsurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (5,486) 3,126 7,792 (4,961)
Reinsurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (3,244) (13,776) (14,048) (13,493)
Reinsurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (2,645) (1,434) (21,157) (23,375)
Reinsurance | Credit and surety        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 8,624 11,184 (1,231) 27,927
Reinsurance | Motor        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 8,345 $ 1,214 $ 38,431 $ 18,732