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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 26, 2015 | Dec. 27, 2014
Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets fair value | [1] | $ 511 | $ 95
Liabilities fair value | [1] | (4,691) | (1,825)
Commodity Contracts [Member] | Cash Flow Hedging [Member] | Long [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Open future contracts to purchase copper |  | $ 22,700 |
Time period for open copper future contract purchases |  | 12 months |
Fair value of future contracts with gain (loss) position |  | $ (1,800) |
Commodity Contracts [Member] | Fair Value Hedging [Member] | Short [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Open future contracts to sell copper |  | $ 9,800 |
Time period for open copper future contract sales |  | 6 months |
Fair value of future contracts with gain (loss) position |  | $ 508 |
Other Current Asset [Member] | Commodity Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other current assets: Gain positions |  | 511 | 99
Other current assets: Loss positions |  | 0 | (4)
Other Current Asset [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other current assets: Gain positions |  | 0 | 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 |  | 61 | 15
Other current liability: Loss positions |  | (1,912) | (832)
Other Current Liabilities [Member] | Foreign Currency Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other current liability: Loss positions |  | (23) | (81)
Other Liabilities [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other liabilities: Loss positions |  | $ (2,817) | $ (927)
[1] | Does not include the impact of cash collateral received from or provided to counterparties.

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