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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ 0 | $ 6,319 | $ 0 | $ 10,357
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 2,784 | 0 | 3,825
Insurance | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (208) | 8,011 | 5,692
Insurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (248) | 0 | (552)
Insurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 2,682 | (8,011) | 15,903
Insurance | Cyber |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 676 | 0 | 9,128
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (3,498) | 0 | (16,092)
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 8,430 | 0 | 12,949
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (5,050) | 0 | (23,203)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 3,535 | 0 | 6,532
Reinsurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 7,284 | 0 | 14,273
Reinsurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 5,197 | 0 | 4,947
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (10,504) | 0 | (13,728)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (7,017) | 0 | (39,870)
Reinsurance | Agriculture |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 2,122 | 0 | 14,013
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (582) | 0 | (1,128)
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | (4,825) | 0 | (21,946)
Reinsurance | Run-Off Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 11,860 | 0 | 49,971
Reinsurance | Run-Off Lines | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 2,264 | 0 | 9,147
Reinsurance | Run-Off Lines | Catastrophe |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | 0 | 7,487 | 0 | 38,546
Reinsurance | Run-Off Lines | Engineering |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Net favorable (adverse) prior year reserve development | $ 0 | $ 2,109 | $ 0 | $ 2,278

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