Financial Instruments (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	$ 9,592	$ (1,619)	$ 2,457
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	53	4	(8)
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	30,359	39,823	(12,067)
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	580	358	48
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0	(6)
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	53	4	(8)
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	(158)	(2,307)	(10,463)
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	9,012	(1,977)	2,409
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	$ 30,359	$ 39,823	$ (12,061)