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BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss recognized in accumulated other comprehensive income (loss) $ 1,968 $ 1,550  
Amounts recognized in balance sheets [Abstract]      
Current liabilities (365) (369)  
Noncurrent liabilities (7,834) (7,305)  
Total amount recognized in balance sheet (8,199) (7,674)  
Net pension cost [Abstract]      
Amortization of prior service cost [1] 0 0 $ (432)
Amortization of actuarial loss [1] $ (90) (102) (169)
Curtailment loss recognized     222
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of final average earnings as annual benefits 55.00%    
Maximum amount of annual retirement benefits $ 125    
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of the year 7,674 7,719  
Interest cost 321 341 314
Actuarial losses (gains) 509 (72)  
Benefits paid (305) (314)  
Benefit obligation at end of year 8,199 7,674 7,719
Change in plan assets [Roll Forward]      
Employer contribution 305 314  
Benefits paid (305) (314)  
Fair value of plan assets at end of year 0 0  
Funded status of the plan - (underfunded) (8,199) (7,674)  
Accumulated benefit obligations 8,199 7,674  
Net pension cost [Abstract]      
Service cost-benefits earned during the period 0 0 129
Interest cost on projected benefit obligation 321 341 314
Amortization of prior service cost 0 0 210
Amortization of actuarial loss 90 102 169
Curtailment loss recognized 0 0 222
Net pension costs 411 $ 443 $ 1,044
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic cost $ 143    
[1] These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs. For 2015, this includes $222,000 in curtailment loss on the SERP.