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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
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | $ 24,323 | $ (411,882) | $ 25,533
Insurance |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 16,209 | (176,353) | 16,350
Insurance | Property |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 17,718 | 16,195 | 52,512
Insurance | Accident and health |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 4,191 | (10,236) | (12,856)
Insurance | Marine and aviation |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | (10,656) | 26,977 | 27,927
Insurance | Cyber |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 35,579 | 8,416
Insurance | Professional lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | (41,243) | (29,093)
Insurance | Credit and political risk |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 4,956 | 31,691 | 24,361
Insurance | Liability |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | (235,316) | (54,917)
Reinsurance |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 8,114 | (235,529) | 9,183
Reinsurance | Accident and health |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 29,947 | 14,199
Reinsurance | Marine and aviation |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 4,111 | 12,595 | 2,597
Reinsurance | Professional lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | (92,181) | (54,820)
Reinsurance | Liability |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | (262,114) | (58,148)
Reinsurance | Agriculture |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 10,781 | 11,703
Reinsurance | Credit and surety |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 4,003 | 8,306 | 43,567
Reinsurance | Motor |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | (9,653) | 18,161
Reinsurance | Run-off lines |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 66,790 | 31,924
Reinsurance | Run-off lines | Property |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 15,225 | 42,523
Reinsurance | Run-off lines | Catastrophe |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | 0 | 46,297 | (504)
Reinsurance | Run-off lines | Engineering |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Net favorable prior year reserve development | $ 0 | $ 5,268 | $ (10,095)

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