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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (32,098) | $ (42,957) | $ (136,850) | $ (60,790)
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (113,332) | (51,810)
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (73,780) | (67,344)
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 |  |  | 25,994 |
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 |  |  | (31,000) | 4,385
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 |  |  | (3,077) | (10,887)
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (22,636) | (25,821)
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (24,059) | (10,300)
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (18,382) | (22,143)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (620) | (2,578)
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 |  |  | (39,552) | 15,534
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 |  |  | (39,552) | 15,534
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (31,639) | (35,052) | (113,332) | (51,810)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (23,518) | (8,980)
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 |  |  | (26,428) | (27,315)
Casualty and Specialty | Actuarial assumption changes |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | 2,910 | 18,335
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (459) | $ (7,905) | $ (23,518) | $ (8,980)

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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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