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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Development (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect $ 4,038 $ 8,956
Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect 1,041 7,062
Reinsurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect $ 2,997 $ 1,894