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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Development (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]        
Prior years - net favorable (adverse) effect $ 4,735 $ 11,012 $ 17,632 $ 23,138
Insurance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Prior years - net favorable (adverse) effect 2,558 5,418 12,396 13,351
Reinsurance        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Prior years - net favorable (adverse) effect $ 2,177 $ 5,594 $ 5,236 $ 9,787