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PENSION LIABILITIES, NET (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability, Defined Benefit Plan [Abstract]      
Net periodic benefit cost, discount rate 2.30%    
Actuarial gain (loss) $ 48 $ (204) $ 174