Derivative Instruments, Hedging Activities and Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 2,498		$ 977
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	(6)		34
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	20,453		(11,247)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	5		(362)
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	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	(6)		34
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	2,059	[1]	(4,694)	[1]
Cross Currency Interest Rate Contract [Member]
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	2,493		1,339
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0		0
Cross Currency Interest Rate Contract [Member] | 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	$ 20,453	[2]	$ (11,247)	[2]

[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.