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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in projected benefit obligation      
Service cost $ 382 $ 383  
Interest cost 1,487 2,012  
Amounts recognized in the consolidated balance sheets consist of:      
Long-term pension liability (27,776) (33,534)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net amount recognized 18,011 21,955 $ 17,503
Plan Assets [Member]      
Change in plan assets      
Fair value of plan assets, beginning of year 43,144    
Fair value of plan assets, end of year 44,582 43,144  
Defined Benefit Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 56,026 50,552  
Service cost 382 383  
Interest cost 1,047 1,450  
Actuarial (gain) loss (2,366) 6,067  
Benefits paid (2,582) (2,426)  
Projected benefit obligation, end of year 52,507 56,026  
Change in plan assets      
Actual return on plan assets 4,402 4,917  
Administrative expenses (382) (383)  
Contributions 0 0  
Benefits paid (2,582) (2,426)  
Funded status of plan (7,925) (12,882)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other 0 0  
Long-term pension liability (7,925) (12,882)  
Net amount recognized (7,925) (12,882)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $4,331, $5,435, $1,976, and $2,275, respectively 12,328 15,468  
Prior service cost net of income tax benefit of $0, $0, $20 and $4, respectively 0 0  
Net amount recognized 12,328 15,468  
Defined Benefit Pension Plan [Member] | Plan Assets [Member]      
Change in plan assets      
Fair value of plan assets, beginning of year 43,144 41,036  
Fair value of plan assets, end of year 44,582 43,144  
Supplemental Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 21,125 18,460  
Service cost 0 0  
Interest cost 440 562  
Actuarial (gain) loss (840) 2,485  
Benefits paid (382) (382)  
Projected benefit obligation, end of year 20,343 21,125  
Change in plan assets      
Actual return on plan assets 0 0  
Administrative expenses 0 0  
Contributions 382 382  
Benefits paid (382) (382)  
Funded status of plan (20,343) (21,125)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other (492) (473)  
Long-term pension liability (19,851) (20,652)  
Net amount recognized (20,343) (21,125)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $4,331, $5,435, $1,976, and $2,275, respectively 5,624 6,475  
Prior service cost net of income tax benefit of $0, $0, $20 and $4, respectively 59 12  
Net amount recognized 5,683 6,487  
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