Derivative Instruments and Hedging Activities Part 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Restricted cash related to open futures contracts	$ 217
Commodity contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI (Effective Portion), Net of Tax	1,287	(168)
Commodity contracts [Member] | Cash Flow Hedging [Member] | Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) Loss Reclassified from Accumulated OCI into Income (Effective Portion), Net of Tax	$ (374)	$ (609)