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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Lines of credit    
Outstanding borrowings $ 28,785 $ 42,128
Less: debt issuance costs (650) (773)
Total debt 28,135 41,355
Less: current portion of long-term debt (3,125) (3,125)
Long-term debt 25,010 38,230
Capital expenditure facility    
Lines of credit    
Outstanding borrowings 22,656 25,000
Credit Facility | U.S. Dollar revolving loan    
Lines of credit    
Outstanding borrowings $ 6,129 $ 17,128