Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands		9 Months Ended
		Oct. 01, 2016	Dec. 26, 2015
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Assets fair value	[1]	$ 1,611	$ 60
Liabilities fair value	[1]	(1,730)	(3,318)
Commodity Contracts [Member] | Cash Flow Hedging [Member] | Long [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to purchase copper		$ 33,100
Time period for open copper future contract purchases		10 months
Fair value of future contracts with gain (loss) position		$ 1,600
Commodity Contracts [Member] | Fair Value Hedging [Member] | Short [Member]
Derivatives, Fair Value [Line Items]
Open future contracts to sell copper		$ 6,100
Time period for open copper future contract sales		6 months
Fair value of future contracts with gain (loss) position		$ (129)
Other Current Asset [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current assets: Gain positions		1,634	60
Other current assets: Loss positions		(23)	0
Other Assets [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other assets: Gain positions		0	0
Other Current Liabilities [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other current liability: Gain positions		0	238
Other current liability: Loss positions		(129)	(1,864)
Other Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Other liabilities: Loss positions		$ (1,601)	$ (1,692)

[1] Does not include the impact of cash collateral received from or provided to counterparties.