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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligations:      
Benefit obligations at beginning of year $ 136,425 $ 118,958  
Interest cost 4,185 4,864 $ 4,462
Actuarial loss 12,396 17,084  
Benefits paid (5,072) (4,481)  
Benefit obligations at end of year 147,934 136,425 118,958
Change in plan assets:      
Fair value of plan assets at beginning of year 91,567 75,823  
Employer contribution 1,739 5,559  
Actual return on plan assets 12,735 14,666  
Benefits paid (5,072) (4,481)  
Fair value of plan assets at end of year 100,969 91,567 $ 75,823
Funded status at the end of year (46,965) (44,858)  
Amounts recognized in balance sheet:      
Non-current liability (46,965) (44,858)  
Amount recognized in accumulated other comprehensive income consists of:      
Prior service cost (754) (940)  
Net actuarial loss (46,519) (45,125)  
Amounts recognized in accumulated other comprehensive income $ (47,273) $ (46,065)  
Weighted-average assumption to determine benefit obligations      
Discount rate 2.37% 3.15%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 3.15% 4.17%  
Expected return on plan assets 6.50% 6.50%