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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (31,906) | $ (147,650) | $ (92,696) | $ (208,711)
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (76,069) | (202,080)
Property | Large and 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 |  |  | (76,069) | (202,080)
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (81,976) | (160,586)
Property | 2021 Weather-Related Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | 42,766 |
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 |  |  | (32,988) | 16,939
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (50,148) | (40,582)
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (15,493) | (99,337)
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (28,722) | (38,220)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | 2,609 | 614
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 |  |  | 5,907 | (41,494)
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 |  |  | 5,907 | (41,494)
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (24,259) | (145,935) | (76,069) | (202,080)
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses |  |  | (16,627) | (6,631)
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 |  |  | (38,139) | (9,612)
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 |  |  | 21,512 | 2,981
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (7,647) | $ (1,715) | $ (16,627) | $ (6,631)

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