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LIABILITY FOR UNPAID LOSSES AND LOSS ADJUSTMENT EXPENSES - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 3,503,716        
All outstanding liabilities before 2020, net of reinsurance 16,426        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 377,628        
Accident Year 2020          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 796,087 $ 734,607 $ 645,553 $ 604,201 $ 452,560
Accident Year 2021          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 771,807 725,118 665,008 $ 461,709  
Accident Year 2022          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 784,196 736,066 $ 518,829    
Accident Year 2023          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance 614,413 $ 460,721      
Accident Year 2024          
Claims Development [Line Items]          
Cumulative Paid Loss and Defense & Cost Containment Expenses, Net of Reinsurance $ 537,213