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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Net loss and loss expenses $ 741,655 $ 720,035
Novae Syndicate 2007    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Policyholder benefits and claims incurred, assumed and ceded   49,000
Catastrophe and Weather-related Events    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Net loss and loss expenses 60,000 $ 110,000
Ukraine-Russia War    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Net loss and loss expenses $ 30,000