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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year development (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect $ 8,956 $ 5,317
Insurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect 7,062 1,505
Reinsurance    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Prior years - net favorable (adverse) effect $ 1,894 $ 3,812