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EMPLOYEE BENEFIT PLANS - Benefit Obligations, Plan Assets and Reported Amounts (Details) - Defined benefit pension plan - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in benefit obligations:      
Benefit obligations at beginning of year $ 147,934 $ 136,425  
Interest cost 3,438 4,185 $ 4,864
Actuarial loss (gain) (6,406) 12,396  
Benefits paid (5,400) (5,072)  
Benefit obligations at end of year 139,566 147,934 136,425
Change in plan assets:      
Fair value of plan assets at beginning of year 100,969 91,567  
Employer contribution 3,312 1,739  
Actual return on plan assets 15,095 12,735  
Benefits paid (5,400) (5,072)  
Fair value of plan assets at end of year 113,976 100,969 $ 91,567
Funded status at the end of year (25,590) (46,965)  
Amounts recognized in balance sheet:      
Non-current liability (25,590) (46,965)  
Amount recognized in accumulated other comprehensive income consists of:      
Prior service cost (568) (754)  
Net actuarial loss (27,271) (46,519)  
Amounts recognized in accumulated other comprehensive income $ (27,839) $ (47,273)  
Weighted-average assumption to determine benefit obligations      
Discount rate 2.73% 2.37%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 2.37% 3.15%  
Expected return on plan assets 6.50% 6.50%