OTHER NONOPERATING EXPENSE, NET (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ 79	$ 108
Foreign currency exchange gain, net	1,681	15,422
Change in fair value of derivatives (Note 11)	368	(14,050)
Other income / (expense), net	197	(64)
Total other non-operating income	$ 2,325	$ 1,416