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EMPLOYEE RETIREMENT PLANS - Schedule of change in benefit obligation and plan assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in projected benefit obligation    
Service cost $ 383 $ 463
Interest cost 2,012 2,460
Amounts recognized in the consolidated balance sheets consist of:    
Long-term pension liability (33,534) (27,523)
Amounts recognized in accumulated other comprehensive loss consist of:    
Net amount recognized 21,955 17,503
Plan Assets [Member]    
Change in plan assets    
Fair value of plan assets, beginning of year 41,036  
Fair value of plan assets, end of year 43,144 41,036
Defined Benefit Pension Plan [Member]    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 50,552 45,010
Service cost 383 463
Interest cost 1,450 1,801
Actuarial loss 6,067 5,660
Benefits paid (2,426) (2,382)
Projected benefit obligation, end of year 56,026 50,552
Change in plan assets    
Actual return on plan assets 4,917 6,528
Administrative expenses (383) (463)
Contributions 0 0
Benefits paid (2,426) (2,382)
Funded status of plan (12,882) (9,516)
Amounts recognized in the consolidated balance sheets consist of:    
Accrued liabilities - other 0 0
Long-term pension liability (12,882) (9,516)
Net amount recognized (12,882) (9,516)
Amounts recognized in accumulated other comprehensive loss consist of:    
Accumulated loss, net of income tax benefit of $5,435, $4,478, $2,275 and $1,684, respectively 15,468 12,745
Prior service cost (credit) net of income tax liability of $0, $0, $4 and ($12), respectively 0 0
Net amount recognized 15,468 12,745
Defined Benefit Pension Plan [Member] | Plan Assets [Member]    
Change in plan assets    
Fair value of plan assets, beginning of year 41,036 37,353
Fair value of plan assets, end of year 43,144 41,036
Supplemental Pension Plan [Member]    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 18,460 15,891
Service cost 0 0
Interest cost 562 659
Actuarial loss 2,485 2,355
Benefits paid (382) (445)
Projected benefit obligation, end of year 21,125 18,460
Change in plan assets    
Actual return on plan assets 0 0
Administrative expenses 0 0
Contributions 382 445
Benefits paid (382) (445)
Funded status of plan (21,125) (18,460)
Amounts recognized in the consolidated balance sheets consist of:    
Accrued liabilities - other (473) (453)
Long-term pension liability (20,652) (18,007)
Net amount recognized (21,125) (18,460)
Amounts recognized in accumulated other comprehensive loss consist of:    
Accumulated loss, net of income tax benefit of $5,435, $4,478, $2,275 and $1,684, respectively 6,475 4,792
Prior service cost (credit) net of income tax liability of $0, $0, $4 and ($12), respectively 12 (34)
Net amount recognized 6,487 4,758
Supplemental Pension Plan [Member] | Plan Assets [Member]    
Change in plan assets    
Fair value of plan assets, beginning of year 0 0
Fair value of plan assets, end of year $ 0 $ 0