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RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred losses narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 15, 2019
Dec. 31, 2018
Additional Information Related to Net Incurred Losses [Line Items]          
Net losses and loss expenses, net of reinstatement premiums $ 3,041,193 $ 3,297,161 $ 3,123,698    
Reinsurance recoverable on unpaid claims 5,017,611 4,496,641 3,877,756   $ 3,501,669
Syndicate 2007          
Additional Information Related to Net Incurred Losses [Line Items]          
Policyholder benefits and claims incurred, assumed and ceded 49,000        
Reinsurance recoverable on unpaid claims       $ 59,000  
Catastrophe and Weather-related Events          
Additional Information Related to Net Incurred Losses [Line Items]          
Net losses and loss expenses, net of reinstatement premiums $ 443,000 $ 774,000 $ 336,000