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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