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EMPLOYEE RETIREMENT PLANS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in projected benefit obligation      
Service cost $ 563 $ 1,638 $ 1,636
Interest cost 2,207 2,449 2,665
Change in plan assets      
Fair value of plan assets, beginning of year 32,278    
Benefits paid   (1,900)  
Fair value of plan assets, end of year 38,369 32,278  
Amounts recognized in the consolidated balance sheets consist of:      
Long-term pension liability (27,766) (27,801)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net amount recognized 13,673 11,080 12,776
Defined Benefit Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 45,079 48,677  
Service cost 378 1,328  
Interest cost 1,616 1,833  
Plan curtailment 0 (5,098)  
Actuarial loss 4,423 2,282  
Benefits paid (2,121) (3,943)  
Projected benefit obligation, end of year 49,375 45,079 48,677
Change in plan assets      
Fair value of plan assets, beginning of year 32,278 32,345  
Actual return on plan assets 4,590 1,791  
Administrative expenses (378) (315)  
Contributions 4,000 2,400  
Benefits paid (2,121) (3,943)  
Fair value of plan assets, end of year 38,369 32,278 32,345
Funded status of plan (11,006) (12,801)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other 0 0  
Long-term pension liability (11,006) (12,801)  
Net amount recognized (11,006) (12,801)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $5,904, $5,373, $2,166 and $1,802, respectively 9,916 8,403  
Prior service cost, net of income tax liability of $0, $0, ($75) and ($91), respectively 0 0  
Net amount recognized 9,916 8,403  
Supplemental Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 15,409 14,261  
Service cost 185 310  
Interest cost 591 616  
Plan curtailment 0 (919)  
Actuarial loss 1,519 1,527  
Benefits paid (528) (386)  
Projected benefit obligation, end of year 17,176 15,409 14,261
Change in plan assets      
Fair value of plan assets, beginning of year 0 0  
Actual return on plan assets 0 0  
Administrative expenses 0 0  
Contributions 528 386  
Benefits paid (528) (386)  
Fair value of plan assets, end of year 0 0 $ 0
Funded status of plan (17,176) (15,409)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other (416) (409)  
Long-term pension liability (16,760) (15,000)  
Net amount recognized (17,176) (15,409)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $5,904, $5,373, $2,166 and $1,802, respectively 3,854 2,820  
Prior service cost, net of income tax liability of $0, $0, ($75) and ($91), respectively (97) (143)  
Net amount recognized $ 3,757 $ 2,677