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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development By Segment and Line of Business (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) claim | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ 8,012 | $ 2,762 | $ 8,011 | $ 13,118
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 4,009 | 1,609 | 4,008 | 5,433
Insurance | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 2,043 | $ (10,068) | 10,053 | (4,376)
Number of prior year claims | claim |  | 2 |  |
Insurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 1,966 | $ (5,213) | 1,966 | (5,765)
Insurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 19,472 | (8,011) | 35,374
Insurance | Cyber |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 10,869 | 0 | 19,997
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (4,383) | 0 | (20,475)
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 3,374 | 0 | 16,323
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (12,442) | 0 | (35,645)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 4,003 | 1,153 | 4,003 | 7,685
Reinsurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 5,842 | 0 | 20,115
Reinsurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 3,576 | 0 | 8,523
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (9,044) | 0 | (22,772)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (15,222) | 0 | (55,092)
Reinsurance | Agriculture |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 729 | 0 | 14,741
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 4,003 | 9,625 | 4,003 | 8,498
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (1,302) | 0 | (23,248)
Reinsurance | Run-Off Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 6,949 | 0 | 56,920
Reinsurance | Run-Off Lines | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 3,421 | 0 | 12,568
Reinsurance | Run-Off Lines | Catastrophe |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 1,436 | 0 | 39,982
Reinsurance | Run-Off Lines | Engineering |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ 0 | $ 2,092 | $ 0 | $ 4,370

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