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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior year development (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]      
Net favorable prior year reserve development $ 78,900 $ 199,662 $ 200,054
Insurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Net favorable prior year reserve development 53,302 92,806 60,459
Reinsurance      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Net favorable prior year reserve development $ 25,598 $ 106,856 $ 139,595