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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligations:      
Benefit obligations at beginning of year $ 118,958 $ 127,298  
Interest cost 4,864 4,462 $ 4,587
Actuarial loss (gain) 17,084 (8,562)  
Benefits paid (4,481) (4,240)  
Benefit obligations at end of year 136,425 118,958 127,298
Change in plan assets:      
Fair value of plan assets at beginning of year 75,823 81,981  
Employer contribution 5,559 4,187  
Actual return on plan assets 14,666 (6,105)  
Benefits paid (4,481) (4,240)  
Fair value of plan assets at end of year 91,567 75,823 $ 81,981
Funded status at the end of year (44,858) (43,135)  
Amounts recognized in balance sheet:      
Non-current liability (44,858) (43,135)  
Amount recognized in accumulated other comprehensive income consists of:      
Prior service cost (940) (1,126)  
Net actuarial loss (45,125) (41,697)  
Amounts recognized in accumulated other comprehensive income $ (46,065) $ (42,823)  
Weighted-average assumption to determine benefit obligations      
Discount rate 3.15% 4.17%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 4.17% 3.54%  
Expected return on plan assets 6.50% 7.00%