Derivative Instruments, Hedging Activities and Fair Value (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 2,643	$ 4,978	$ (71)	$ 12,663
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0	78	409	80
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(232)	13,087	3,987	24,739
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	2,378	2,532	1,748	4,132
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0	0	0
Foreign currency forward exchange contracts | Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0	78	409	80
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	552	2,724	2,292	(4,510)
Cross currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	265	2,446	(1,819)	8,531
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0	0	0	0
Cross currency interest rate swaps | Cost of services and products sold
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	$ (232)	$ 13,087	$ 3,987	$ 24,739