Derivative Instruments, Hedging Activities and Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 977	$ 7,294
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	34
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(11,247)	(18,781)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(362)	(527)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	34
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative, included in Cost of services and products sold	(4,694)	(5,121)
Cross-currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	1,339	7,821
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	$ (11,247)	$ (18,781)