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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Lines of credit    
Total lines of credit $ 42,269 $ 18,250
Less: debt issuance costs 815 266
Lines of credit 41,454 17,984
Capital expenditure loan    
Lines of credit    
Total lines of credit 18,990 0
Credit Facility | U.S. Dollar revolving loan    
Lines of credit    
Total lines of credit $ 23,279 $ 18,250