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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Income taxes recoverable $ 209 $ 206
Unrelated customers 157,728 187,937
Less: allowance for bad debts and credit notes (8,583) (9,598)
Total accounts receivable $ 149,145 $ 178,339