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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, 2023
Mar. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect $ 4,038 $ 8,956
Insurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 1,041 7,062
Insurance | Property    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 5,900 8,060
Insurance | Accident and health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (304) 3,632
Insurance | Marine and aviation    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 13,221 14,647
Insurance | Cyber    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 8,452 (687)
Insurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (12,594) (5,936)
Insurance | Credit and political risk    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 4,519 895
Insurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (18,153) (13,549)
Reinsurance    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 2,997 1,894
Reinsurance | Accident and health    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 6,988 (499)
Reinsurance | Marine and aviation    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (250) 497
Reinsurance | Professional lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (3,225) (24,522)
Reinsurance | Liability    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (32,853) (4,105)
Reinsurance | Agriculture    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 11,891 1,231
Reinsurance | Credit and surety    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (546) 7,465
Reinsurance | Motor    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect (17,122) (1,730)
Reinsurance | Run Off Lines    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 38,114 23,557
Reinsurance | Run Off Lines | Property    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 6,883 22,539
Reinsurance | Run Off Lines | Catastrophe    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect 31,058 (246)
Reinsurance | Run Off Lines | Engineering    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Prior years - net favorable (adverse) effect $ 173 $ 1,264