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PENSION PLAN (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Current service cost, net of employee contributions $ 15 $ 17
Interest cost on accrued benefit obligation 26 25
Expected return on plan assets (40) (43)
Amortization of transitional obligation 3 3
Amortization of past service costs 2 2
Amortization of net actuarial gain 13 14
Total cost of benefit 19 18
Selling, General and Administrative Expenses [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current service cost, net of employee contributions 15 17
Other Expense [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost on accrued benefit obligation 26 25
Expected return on plan assets (40) (43)
Amortization of transitional obligation 3 3
Amortization of past service costs 2 2
Amortization of net actuarial gain $ 13 $ 14