Derivative Instruments and Hedging Activities (Details) (USD $)	9 Months Ended
	Sep. 29, 2012	Sep. 29, 2012 Other Current Asset [Member] Commodity contracts [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2011 Other Current Asset [Member] Commodity contracts [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2011 Other Current Liabilities [Member] Commodity contracts [Member] Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities [Abstract]
Net fair value of cash flow hedges whose realized gains would be reclassified into earnings	$ 677,000
Open future contracts to purchase copper	14,400,000
Time period for open copper future contract purchases (in months)	15 months
Fair value of future contracts with gain position	703,000
Derivatives, Fair Value [Line Items]
Other current assets: gain positions		802,000	85,000
Other current assets: loss positions		(99,000)	(25,000)
Other current liability: gain positions				339,000
Other current liability: loss positions				(1,078,000)
Open future contracts to sell copper	$ 34,000,000
Time period for open future contract sales	6 months