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CONTINGENT LIABILITIES (Narrative) (Details)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Item
Dec. 31, 2017
USD ($)
Item
Dec. 31, 2016
USD ($)
Item
Dec. 31, 2015
USD ($)
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]            
Number of lawsuits against the company 3       3 5
Minimum limit of per claim for providing insurance coverage on annual basis $ 5.0          
Maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis $ 10.0          
Total amount of damages claimed   $ 0.1 $ 0.1      
Total Product Liability Expense   $ 0.4 $ 2.1 $ 0.9    
Number of new lawsuits | Item   0 3      
Number of settled lawsuits | Item   0 1      
Number of claims dismissed | Item   2 0