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EMPLOYEE RETIREMENT PLANS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in projected benefit obligation      
Service cost $ 1,638 $ 1,636 $ 1,263
Interest cost [1] 2,449 2,665 2,586
Benefits paid (1,900)    
Change in plan assets      
Fair value of plan assets, beginning of year 32,345    
Benefits paid (1,900)    
Fair value of plan assets, end of year 32,278 32,345  
Amounts recognized in the consolidated balance sheets consist of:      
Long-term pension liability (27,801) (30,188)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net amount recognized 11,080 12,776 15,136
Defined Benefit Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 48,677 50,932  
Service cost 1,328 1,345  
Interest cost 1,833 2,051  
Plan curtailment (5,098) 0  
Actuarial loss (gain) 2,282 (3,806)  
Benefits paid (3,943) (1,845)  
Projected benefit obligation, end of year 45,079 48,677 50,932
Change in plan assets      
Fair value of plan assets, beginning of year 32,345 32,027  
Actual return on plan assets 1,791 (320)  
Administrative expenses (315) (150)  
Contributions 2,400 2,633  
Benefits paid (3,943) (1,845)  
Fair value of plan assets, end of year 32,278 32,345 32,027
Funded status of plan (12,801) (16,332)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other 0 0  
Long-term pension liability (12,801) (16,332)  
Net amount recognized (12,801) (16,332)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $5,373, $6,631, $1,802 and $1,808, respectively 8,403 10,371  
Prior service cost, net of income tax liability of $0, $0, ($91) and ($270), respectively 0 0  
Net amount recognized 8,403 10,371  
Supplemental Pension Plan [Member]      
Change in projected benefit obligation      
Projected benefit obligation, beginning of year 14,261 14,841  
Service cost 310 291  
Interest cost 616 614  
Plan curtailment (919) 0  
Actuarial loss (gain) 1,527 (1,135)  
Benefits paid (386) (350)  
Projected benefit obligation, end of year 15,409 14,261 14,841
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 386 350  
Benefits paid (386) (350)  
Fair value of plan assets, end of year 0 0 $ 0
Funded status of plan (15,409) (14,261)  
Amounts recognized in the consolidated balance sheets consist of:      
Accrued liabilities - other (409) (405)  
Long-term pension liability (15,000) (13,856)  
Net amount recognized (15,409) (14,261)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Accumulated loss, net of income tax benefit of $5,373, $6,631, $1,802 and $1,808, respectively 2,820 2,828  
Prior service cost, net of income tax liability of $0, $0, ($91) and ($270), respectively (143) (423)  
Net amount recognized $ 2,677 $ 2,405  
[1] The decrease in interest cost in 2016 was primarily due to the adoption of the spot-rate approach, as described above.