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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development By Segment and Line of Business (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development $ 0 $ 4,038
Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 1,041
Insurance | Property    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 8,011 5,900
Insurance | Accident and health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (304)
Insurance | Marine and aviation    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development (8,011) 13,221
Insurance | Cyber    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 8,452
Insurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (12,594)
Insurance | Credit and political risk    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 4,519
Insurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (18,153)
Reinsurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 2,997
Reinsurance | Run-Off Lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 38,114
Reinsurance | Property | Run-Off Lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 6,883
Reinsurance | Accident and health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 6,988
Reinsurance | Marine and aviation    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (250)
Reinsurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (3,225)
Reinsurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (32,853)
Reinsurance | Agriculture    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 11,891
Reinsurance | Credit and surety    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (546)
Reinsurance | Motor    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 (17,122)
Reinsurance | Catastrophe | Run-Off Lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development 0 31,058
Reinsurance | Engineering | Run-Off Lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Net favorable (adverse) prior year reserve development $ 0 $ 173