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RESERVE FOR LOSSES AND LOSS EXPENSES - Summary of Prior Year Reserve Development by Segment and Reserving Class (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments $ 25,533 $ 32,410 $ 15,909
Insurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 16,350 18,360 8,937
Insurance | Property      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 52,512 71,032 44,054
Insurance | Accident and health      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (12,856) 15,844 2,738
Insurance | Marine and aviation      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 27,927 42,535 23,195
Insurance | Cyber      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 8,416 (7,329) 2,205
Insurance | Professional lines      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (29,093) (71,258) (37,866)
Insurance | Credit and political risk      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 24,361 10,363 (745)
Insurance | Liability      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (54,917) (42,827) (24,644)
Reinsurance      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 9,183 14,049 6,972
Reinsurance | Accident and health      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 14,199 5,861 7,373
Reinsurance | Marine and aviation      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 2,597 (10,767) (12,664)
Reinsurance | Professional lines      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (54,820) (23,718) (15,352)
Reinsurance | Liability      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (58,148) (17,919) (29,656)
Reinsurance | Motor      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 18,161 43,968 21,086
Reinsurance | Credit and surety      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 43,567 3,436 36,828
Reinsurance | Agriculture      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 11,703 423 5,606
Reinsurance | Run Off Lines      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 31,924 12,765 (6,249)
Reinsurance | Run Off Lines | Property      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments 42,523 17,651 6,818
Reinsurance | Run Off Lines | Catastrophe      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments (504) (36) (3,547)
Reinsurance | Run Off Lines | Engineering      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Prior year favorable (adverse) adjustments $ (10,095) $ (4,850) $ (9,520)