SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Derivatives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
General and Administrative Expense [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 346	$ (11,510)	$ (11,042)