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EMPLOYEE BENEFIT PLANS - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of net periodic benefit cost      
Service cost $ 1,071 $ 1,419 $ 1,708
Interest cost 1,761 1,462 894
Expected return on plan assets (4,063) (4,193) (4,008)
Amortization of net loss 37 1,330 2,421
Settlement charge 0 2,498 1,736
Net periodic pension (benefit) cost $ (1,194) $ 2,516 $ 2,751