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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 3,940 $ 6,808 $ 12,897 $ 12,126
Insurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 2,773 6,427 9,838 7,932
Insurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 1,388 35,290 13,080 50,681
Insurance | Marine        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 1,221 7,348 12,891 19,221
Insurance | Aviation        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 1,705 4,808 4,685 5,844
Insurance | Credit and political risk        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 4,287 4,055 5,182 (1,316)
Insurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 5,433 (33,054) (1,189) (47,646)
Insurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (11,261) (12,020) (24,811) (18,852)
Reinsurance        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 1,167 381 3,059 4,194
Reinsurance | Property and other        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 6,547 12,310 31,333 13,278
Reinsurance | Professional lines        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (6,000) (8,600) (30,522) (10,804)
Reinsurance | Liability        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect (6,823) (11,358) (10,928) (18,512)
Reinsurance | Credit and surety        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect 3,583 (4,916) 11,046 (9,854)
Reinsurance | Motor        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Prior years - net favorable (adverse) effect $ 3,860 $ 12,946 $ 2,130 $ 30,086