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PENSION PLAN (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized in the consolidated balance sheets [Abstract]        
Noncurrent liabilities $ (4,437) $ (5,368) $ (5,549)  
Amounts recognized in accumulated other comprehensive loss [Abstract]        
Accumulated loss (6,876) (8,467) (9,438)  
Deferred income taxes 2,366 2,366 2,366  
Accumulated other comprehensive loss (4,510) (6,101) (7,072)  
Accumulated benefit obligation 23,500 22,900    
COMPONENTS OF NET PERIODIC BENEFIT COST [Abstract]        
Service cost 29 28 28  
Interest cost 840 888 884  
Expected return on plan assets (1,058) (1,118) (1,243)  
Recognized net actuarial loss 850 991 976  
Net periodic benefit cost 661 789 645  
Amortization of estimated net loss, transition obligation and prior service cost from accumulated other comprehensive income into net periodic benefit cost 700      
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 19,055 $ 17,548 $ 17,792 $ 19,000
Fair value of total plan assets by major asset category 100.00% 100.00% 100.00%  
Weighted-average assumptions used to determine benefit obligations [Abstract]        
Discount rate 3.36% 3.81% 3.94%  
Rate of compensation increase 2.50% 2.50% 2.50%  
Weighted-average assumptions used to determine net periodic pension cost [Abstract]        
Pension contributions $ 0 $ 0    
Expected benefit payments for the plan [Abstract]        
Maximum contribution by employee specified as percentage of compensation 25.00%      
Additional contribution by employer 30.00%      
Maximum percentage of compensation contributed by employer as matching contribution 6.00%      
Compensation expense for the 401(k) plan $ 100 700 $ 700  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 19,055 17,548    
Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Equity Securities [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 6,856 $ 8,509    
Fair value of total plan assets by major asset category 36.00% 49.00% 48.00%  
Equity Securities [Member] | Minimum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 30.00%      
Equity Securities [Member] | Maximum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 70.00%      
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 6,856 $ 8,509    
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Fixed Income [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 6,818 $ 6,548    
Fair value of total plan assets by major asset category 36.00% 37.00% 33.00%  
Fixed Income [Member] | Minimum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 20.00%      
Fixed Income [Member] | Maximum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 60.00%      
Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 6,818 $ 6,548    
Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
International Equities [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 3,490 $ 2,484    
Fair value of total plan assets by major asset category 18.00% 14.00% 19.00%  
International Equities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 3,490 $ 2,484    
International Equities [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
International Equities [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 $ 0    
Real Estate [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 1,133      
Fair value of total plan assets by major asset category 6.00% 0.00% 0.00%  
Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 1,133      
Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0      
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0      
Cash and Equivalents [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 758 $ 7    
Fair value of total plan assets by major asset category 4.00% 0.00% 0.00%  
Cash and Equivalents [Member] | Minimum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 0.00%      
Cash and Equivalents [Member] | Maximum [Member]        
Expected benefit payments for the plan [Abstract]        
Target plan asset allocations 10.00%      
Cash and Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 758 $ 7    
Cash and Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets 0 0    
Cash and Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Plan assets using the fair value hierarchy [Abstract]        
Fair value of plan assets $ 0 $ 0    
Pension Plan [Member]        
Weighted-average assumptions used to determine net periodic pension cost [Abstract]        
Discount rate 3.36% 3.81% 3.94%  
Rate of compensation increase 2.50% 2.50% 2.50%  
Long-term rate of return 6.00% 6.25% 6.50%  
Expected benefit payments for the plan [Abstract]        
2018 $ 1,303      
2019 1,334      
2020 1,347      
2021 1,364      
2022 1,381      
Years 2023-2027 $ 6,969