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BUSINESS COMBINATION (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 19, 2018
Dec. 31, 2017
Dec. 31, 2016
BUSINESS COMBINATION        
Intangible assets   $ 3,700    
Goodwill $ 35,679 5,669 $ 29,531 $ 27,522
Assets acquired (net of liabilities assumed)   3,943    
Fair value of net assets acquired   13,312    
Tax deductible amount   $ 0