Derivative Instruments, Hedging Activities and Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 2,619		$ 1,136		$ 3,596		$ 8,430
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	222		0		256		0
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	19,992		(4,676)		8,745		(23,457)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	179		(172)		(183)		(699)
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	222				256
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	7,199	[1]	(1,956)	[1]	2,505	[1]	(7,077)	[1]
Cross-currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	2,440		1,308		3,779		9,129
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	$ 19,992	[2]	$ (4,676)	[2]	$ 8,745	[2]	$ (23,457)	[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.