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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

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