ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unrelated customers	$ 152,660	$ 176,628
Less: allowance for bad debts and credit notes	(9,832)	(9,201)
Total accounts receivable	$ 142,828	$ 167,427