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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (97,081) | $ (104,752)
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (94,667) | (81,693)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (70,163) | (76,607)
Property | 2023 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | 1,569 |
Property | 2022 Weather-Related Large Losses |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (8,574) | (7,785)
Property | 2021 Weather-Related Large Lossses |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (36,228) | (32,333)
Property | 2020 Weather-Related Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (6,128) | 6,535
Property | 2019 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (4,053) | (15,369)
Property | 2018 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (9,461) | (16,259)
Property | 2017 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (7,288) | (11,486)
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  | 90
Property | Small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (24,504) | (5,086)
Property | Other small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (24,504) | (5,086)
Property | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (94,667) | (81,693)
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (2,414) | (23,059)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (2,414) | (23,059)
Casualty and Specialty | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (2,414) | $ (23,059)

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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