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DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Lines of credit    
Outstanding borrowings $ 44,098 $ 42,128
Less: debt issuance costs (734) (773)
Total debt 43,364 41,355
Less: current portion of long-term debt (3,125) (3,125)
Long-term debt 40,239 38,230
Capital expenditure facility    
Lines of credit    
Outstanding borrowings 24,219 25,000
Credit Facility | U.S. Dollar revolving loan    
Lines of credit    
Outstanding borrowings $ 19,879 $ 17,128