Derivative Instruments, Hedging Activities and Fair Value (Details 2) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion		$ (2,677)	$ 1,814	$ 6,419	$ (2,535)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion		1	0	2	(2)
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing		(19,090)	(3,801)	11,652	(5,375)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion		(141)	9	334	20
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		1	0	2	(2)
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	[1]	(11,989)	(1,135)	(7,234)	421
Cross currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion		(2,536)	1,805	6,085	(2,555)
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	[2]	$ (19,090)	$ (3,801)	$ 11,652	$ (5,375)

[1] These gains (losses) offset amounts recognized in cost of services and products sold principally as a result of intercompany or third party foreign currency exposures.

[2] These gains (losses) offset foreign currency fluctuation effects on the debt principal.