Financial Instruments (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	$ 335	$ 11,544	$ (1,619)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	410	53	4
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	4,042	30,359	39,823
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	1,884	2,532	358
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0	0
Foreign Exchange Forward | Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	410	53	4
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Amount of Gain (Loss) Recognized in Income on Derivative for the Twelve Months Ended December 31	15,875	(158)	(2,307)
Cross currency interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	(1,549)	9,012	(1,977)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0	0	0
Cross currency interest rate swaps | Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	$ 4,042	$ 30,359	$ 39,823