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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (108,271) | $ (32,098) | $ (205,352) | $ (136,850)
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (179,058) | (113,332)
Property | Actuarial assumption changes |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | 9,962 |
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (145,025) | (73,780)
Property | 2023 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (20,720) |
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 |  |  | (29,577) | 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 |  |  | (56,537) | (31,000)
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 |  |  | (5,303) | (3,077)
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (5,724) | (22,636)
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (12,408) | (24,059)
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (14,756) | (18,382)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  |  | (620)
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 |  |  | (34,033) | (39,552)
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 |  |  | (43,995) | (39,552)
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (84,391) | (31,639) | (179,058) | (113,332)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (26,294) | (23,518)
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 |  |  | 23,371 | 2,910
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 |  |  | (49,665) | (26,428)
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (23,880) | $ (459) | $ (26,294) | $ (23,518)

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