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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of net periodic benefit cost      
Service cost $ 1,708 $ 1,676 $ 1,470
Interest cost 894 1,281 1,569
Expected return on plan assets (4,008) (3,241) (3,025)
Amortization of net loss 2,421 2,453 1,649
Settlement charge 1,736    
Net periodic pension cost $ 2,751 $ 2,169 $ 1,663