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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 4,735 $ 11,012 $ 17,632 $ 23,138
Insurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 2,558 5,418 12,396 13,351
Insurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 5,211 12,486 18,290 63,167
Insurance | Marine        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 17,346 4,189 30,239 23,411
Insurance | Aviation        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 3,203 3,958 7,888 9,802
Insurance | Credit and political risk        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 8,106 7,610 13,288 6,294
Insurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (2,747) (20,759) (3,937) (68,405)
Insurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (28,561) (2,066) (53,372) (20,918)
Reinsurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 2,177 5,594 5,236 9,787
Reinsurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 12,794 (5,486) 44,127 7,792
Reinsurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (11,431) (3,244) (41,954) (14,048)
Reinsurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (11,940) (2,645) (22,868) (21,157)
Reinsurance | Credit and surety        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 5,905 8,623 16,952 (1,231)
Reinsurance | Motor        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 6,849 $ 8,345 $ 8,979 $ 38,431