OTHER NON-OPERATING EXPENSE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment Income, Interest	$ 592	$ 440	$ 294
Foreign currency exchange (gain) / loss, net	6,648	(13,481)	(12,767)
Gain (Loss) on Derivative Instruments, Net, Pretax	(10,213)	4,848	2,311
Non-operating income / (expense), net	486	(17,746)	267
Nonoperating Income (Expense)	$ (2,487)	$ (25,939)	$ (9,895)