Derivative Instruments, Hedging Activities and Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion			$ 2,619			$ 3,596
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion			222			256
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing			19,992			8,745
Foreign currency forward exchange contracts
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion			179			(183)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion						256
Amount of Gain (Loss) Recognized in Income on Derivative - Ineffective Portion and Amount Excluded from Effectiveness Testing			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
Derivatives Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative	(4,108)	[1]	7,199	[1]	(2,049)	2,505
Cross Currency Interest Rate Contract [Member]
Effect of derivative instruments
Amount of Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivative - Effective Portion	(2,731)		2,440		(233)	3,779
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income - Effective Portion	0		0		0	0
Cross Currency Interest Rate Contract [Member] | 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	$ (3,583)	[2]	$ 19,992	[2]	$ 16,870	$ 8,745

[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 exposur

[2] These gains (losses) offset foreign currency fluctuation effects on the debt principal.