Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	$ (699)		$ (193)	$ (859)
Gain (Loss) Reclassified from Accumulated OCI into Earnings	115	1,607	282	6,001
Foreign currency forward contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(124)	13	128	121
Gain (Loss) Reclassified from Accumulated OCI into Earnings	115	244	264	695
Commodity futures contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(543)	1,614	(287)	3,856
Gain (Loss) Reclassified from Accumulated OCI into Earnings	30	1,415	48	5,593
Commodity option contracts
Effect of derivative instruments on earnings
Gain (Loss) Recognized in OCI	(32)	(1,627)	(34)	(4,836)
Gain (Loss) Reclassified from Accumulated OCI into Earnings	(30)	(52)	(30)	(287)
Commodity option and future contracts
Effect of derivative instruments on earnings
Recognized earnings related to mark-to-market accounting	$ 7	$ 53	$ (105)	$ 16