Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 31, 2012	Mar. 31, 2012
Derivative contracts
Assets	$ 58	$ 189	$ 840
Liabilities	(754)	(301)	(59)
Derivatives designated as hedging instruments:
Derivative contracts
Assets	4	127	840
Liabilities	(754)	(301)	(59)
Derivatives designated as hedging instruments: | Foreign currency forward contracts
Derivative contracts
Notional Amounts	14,449		8,698
Assets			308
Liabilities	(247)
Derivatives designated as hedging instruments: | Commodity futures contracts, net
Derivative contracts
Notional Amounts	6,454	7,868	5,623
Assets	4	127	499
Liabilities	(507)	(301)	(59)
Derivatives designated as hedging instruments: | Commodity option contracts
Derivative contracts
Notional Amounts			1,701
Assets			33
Derivatives not designated as hedging instruments:
Derivative contracts
Assets	54	62
Derivatives not designated as hedging instruments: | Commodity futures contracts, net
Derivative contracts
Notional Amounts	481	627	850
Assets	$ 54	$ 62