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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance, beginning of year $ 781,531 $ 733,745  
Change in accumulated other comprehensive income before reclassifications 46,699 (9,189) $ 35,808
Reclassification adjustments from accumulated other comprehensive income (loss) 3,019 5,365 731
Balance, end of year 941,170 781,531 733,745
Total      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance, beginning of year (54,781) (50,957) (87,496)
Balance, end of year (5,063) (54,781) (50,957)
Net unrealized gain (loss) on investments      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance, beginning of year (72,241) (66,967) (88,369)
Change in accumulated other comprehensive income before reclassifications 43,954 (10,639) 20,835
Reclassification adjustments from accumulated other comprehensive income (loss) 3,019 5,365 567
Balance, end of year (25,268) (72,241) (66,967)
Net benefit plan assets and obligations      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance, beginning of year 17,660 16,010 873
Change in accumulated other comprehensive income before reclassifications 899 1,650 14,973
Reclassification adjustments from accumulated other comprehensive income (loss) 0 0 164
Balance, end of year 18,559 17,660 16,010
Foreign currency translation adjustment      
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]      
Balance, beginning of year (200) 0 0
Change in accumulated other comprehensive income before reclassifications 1,846 (200) 0
Reclassification adjustments from accumulated other comprehensive income (loss) 0 0 0
Balance, end of year $ 1,646 $ (200) $ 0