Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	$ (4,900)		$ 8,117		$ (1,067)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	270		83		20
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(13,384)		7,642		21,744
Foreign currency forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	(152)		887		32
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion			83		0
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	0		0		0
Foreign currency forward exchange contracts | Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	270
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Amount of Gain (Loss) Recognized in Income on Derivative for the Twelve Months Ended December 31	(3,529)	[1]	7,238	[1]	1,483	[1]
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion					20
Commodity contracts | Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion					20
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing					10
Cross currency interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	(4,748)		7,230		(1,119)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0		0		0
Cross currency interest rate swaps | Cost of services and products sold
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	$ (13,384)	[2]	$ 7,642	[2]	$ 21,734	[2]

[1] These gains (losses) offset amounts recognized in cost of service 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.