Derivatives and Hedging (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain Recognized in OCI	$ 85	$ 2,640
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	(68)	(356)
Commodity Swap Forward Contracts
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain Recognized in OCI	31	552
Foreign currency contracts
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain Recognized in OCI	54	2,088
Corporate general and administrative expense | Foreign currency contracts
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Earnings	3,819	(13,573)
Total Cost of revenue | Commodity Swap Forward Contracts
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	47	176
Total Cost of revenue | Foreign currency contracts
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	147	(270)
Interest expense | Treasury rate lock agreements
Derivative Instruments, Gain (Loss)
After-Tax Amount of Gain (Loss) Reclassified from AOCI into Earnings	$ (262)	$ (262)