Derivative Instruments, Hedging Activities and Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ (1,002)		$ 10,462		$ 2,594		$ 18,892
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	2		0		258		0
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(17,485)		19,581		(8,740)		(3,876)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(137)		(154)		(320)		(853)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion			0				0
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	2				258
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	(3,186)	[1]	7,507	[1]	(681)	[1]	430	[1]
Cross-currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(865)		10,616		2,914		19,745
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	$ (17,485)	[2]	$ 19,581	[2]	$ (8,740)	[2]	$ (3,876)	[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.