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Derivative Financial Instruments (Summary Of Location And Fair Value Of Derivative Financial Instruments) (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Aluminum Futures Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Net asset (liability), Fair Value | $ 154,000 | $ (147,000)
Film Products Foreign Currency Contract Forward Contract |  |
Derivatives, Fair Value [Line Items] |  |
Net asset (liability), Fair Value | 7,000 | 47,000
Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts | Prepaid Expenses And Other |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives: Fair Value | 208,000 | 31,000
Liability derivatives: Fair Value | (54,000) | (178,000)
Derivatives Designated As Hedging Instruments [Member] | Film Products Foreign Currency Contract Forward Contract | Prepaid Expenses And Other |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives: Fair Value | 7,000 | 47,000
Derivatives Not Designated As Hedging Instruments | Aluminum Futures Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Net asset (liability), Fair Value | $ 0 | $ 0

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