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EMPLOYEE BENEFITS - Net Periodic Benefit Cost (Details) - Pension Benefits - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net periodic benefit cost      
Service cost $ 3,340 $ 3,287 $ 3,817
Interest cost 9,586 9,913 10,106
Expected return on plan assets (13,585) (14,541) (15,025)
Amortization of prior service cost (2,896) (2,896) (3,280)
Effect of partial curtailment 0 (506) (2,666)
Amortization of net loss 0 0 207
Net periodic benefit cost $ (3,555) $ (4,743) $ (6,841)