ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unrelated customers	$ 176,628	$ 186,404
Less: allowance for bad debts and credit notes	(9,201)	(10,692)
Related parties	0	197
Less: allowance for bad debts and credit notes	0	(43)
Total accounts receivable	167,427	175,866
Provision for Doubtful Accounts	$ 2,100	$ 4,200	$ 3,700