Derivatives and Hedging (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	$ (443)	$ 1,503	$ (2,883)	$ 3,921
After-tax amount of gain (loss) reclassified from AOCI into earnings	(1,582)	1,005	(2,181)	1,426
Commodity contracts
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	47	619	79	1,011
Commodity contracts | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	(1)	710	59	1,654
Foreign currency contracts
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	(490)	884	(2,962)	2,910
Foreign currency contracts | Corporate general and administrative expense
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Earnings	(81)	(12,075)	4,064	(19,773)
Foreign currency contracts | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	(1,319)	557	(1,454)	558
Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	$ (262)	$ (262)	$ (786)	$ (786)