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EMPLOYEE BENEFITS (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Discount rate    
Change in the accrued liability an closing for increase in 100 p.b. $ (5,795) $ (5,665)
Change in the accrued liability an closing for decrease of 100 p.b. 6,617 5,952
Rate of wage growth    
Change in the accrued liability an closing for increase in 100 p.b. 6,412 6,334
Change in the accrued liability an closing for decrease of 100 p.b. $ (5,750) $ (5,644)