Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	$ 73	$ 314	$ (120)	$ (545)
Gain (Loss) Reclassified from Accumulated OCI into Earnings	(41)	1,551	241	7,552
Foreign currency forward contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	94	(116)	222	4
Gain (Loss) Reclassified from Accumulated OCI into Earnings	164	359	428	1,054
Commodity futures contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(20)	982	(307)	4,839
Gain (Loss) Reclassified from Accumulated OCI into Earnings	(200)	1,210	(152)	6,803
Commodity option contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(1)	(552)	(35)	(5,388)
Gain (Loss) Reclassified from Accumulated OCI into Earnings	(5)	(18)	(35)	(305)
Commodity option and future contracts
Effect of derivative instruments on earnings
Recognized earnings related to mark-to-market accounting	$ 27	$ 80	$ (16)	$ 172