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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 6,319 | $ 3,940 | $ 10,357 | $ 12,897
Insurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,784 | 2,773 | 3,825 | 9,838
Insurance | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (208) | 2,721 | 5,692 | 10,783
Insurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (248) | (1,334) | (552) | 2,298
Insurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,682 | 2,927 | 15,903 | 17,575
Insurance | Cyber |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 676 | 7,783 | 9,128 | 7,097
Insurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (3,498) | (2,350) | (16,092) | (8,286)
Insurance | Credit and political risk |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 8,430 | 4,287 | 12,949 | 5,182
Insurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (5,050) | (11,261) | (23,203) | (24,811)
Reinsurance |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 3,535 | 1,167 | 6,532 | 3,059
Reinsurance | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 7,000 |  | 14,000 |
Reinsurance | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,000 |  | 5,000 |
Reinsurance | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (11,000) | (6,000) | (14,000) | (31,000)
Reinsurance | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (7,000) | (7,000) | (40,000) | (11,000)
Reinsurance | Agriculture |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect |  | 7,000 | 14,000 | 8,000
Reinsurance | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect |  | 4,000 |  | 11,000
Reinsurance | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (5,000) | 4,000 | (22,000) |
Reinsurance | Run-Off Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 11,860 | (1,883) | 49,971 | 21,673
Reinsurance | Run-Off Lines | Property |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,264 | 2,053 | 9,147 | 24,592
Reinsurance | Run-Off Lines | Catastrophe |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 7,487 | (694) | 38,546 | (940)
Reinsurance | Run-Off Lines | Engineering |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,109 | (3,242) | 2,278 | (1,979)
Reinsurance | Non Run-Off Lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (8,325) | 3,050 | (43,439) | (18,614)
Reinsurance | Non Run-Off Lines | Accident and health |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 7,284 | 2,186 | 14,273 | 1,687
Reinsurance | Non Run-Off Lines | Marine and aviation |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 5,197 | (896) | 4,947 | (400)
Reinsurance | Non Run-Off Lines | Professional lines |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (10,504) | (6,000) | (13,728) | (30,522)
Reinsurance | Non Run-Off Lines | Liability |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (7,017) | (6,823) | (39,870) | (10,928)
Reinsurance | Non Run-Off Lines | Agriculture |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,122 | 7,141 | 14,013 | 8,372
Reinsurance | Non Run-Off Lines | Credit and surety |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | (582) | 3,582 | (1,128) | 11,047
Reinsurance | Non Run-Off Lines | Motor |  |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ (4,825) | $ 3,860 | $ (21,946) | $ 2,130

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