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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

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