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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year development (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior years $ 15,909 $ 78,900 $ 199,662
Insurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior years 8,937 53,302 92,806
Reinsurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Prior years $ 6,972 $ 25,598 $ 106,856