Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative - Effective Portion	$ 2,457	$ (4,900)	$ 8,117
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	(8)	270	83
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(12,067)	(13,384)	7,642
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	48	(152)	887
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing	(6)	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	(8)	270	83
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	(10,463)	(3,529)	7,238	[1]
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	2,409	(4,748)	7,230
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	$ (12,061)	$ (13,384)	$ 7,642	[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.