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RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES - Changes in Property and Casualty Losses and Loss Settlement Expense Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Gross liability for losses and loss settlement expenses at beginning of year $ 1,796,782 $ 1,638,755 $ 1,497,274
Ceded losses and loss settlement expenses (198,083) (191,640) (146,875)
Net liability for losses and loss settlement expenses at beginning of year 1,598,699 1,447,115 1,350,399
Losses and loss settlement expenses incurred for claims occurring during      
Current year 778,480 745,813 701,664
Prior years (14,078) (1,208) 67,750
Total incurred 764,402 744,605 769,414
Losses and loss settlement expense payments for claims occurring during      
Current year 194,149 186,322 191,899
Prior years 457,759 406,699 480,800
Total paid 651,908 593,021 672,699
Net liability for losses and loss settlement expenses at end of year 1,711,193 1,598,699 1,447,115
Ceded losses and loss settlement expenses 213,633 198,083 191,640
Gross liability for losses and loss settlement expenses at end of year $ 1,924,826 $ 1,796,782 $ 1,638,755