Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	$ 8,117	$ (1,067)	$ (39,865)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	83	20	1,025
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	7,642	21,744	(5,904)
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	887	32	(23)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	83
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative, included in Cost of services and products sold	7,238	1,483	(6,308)
Cross-currency interest rate swaps
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	7,230	(1,119)	(36,490)
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	7,642	21,734	(5,586)
Commodity contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion		20	(3,352)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion		20	1,025
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing		$ 10	$ (318)