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Derivative Financial Instruments (Narrative) (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2014
Aluminum Futures Contracts
USD ($)
lb
Dec. 31, 2013
Aluminum Futures Contracts
USD ($)
lb
Jun. 30, 2014
Film Products Foreign Currency Contract Forward Contract
USD ($)
Jun. 30, 2014
Film Products Foreign Currency Contract Forward Contract
EUR (€)
Dec. 31, 2013
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Film Products Foreign Currency Contract Forward Contract
EUR (€)
Jun. 30, 2014
Derivatives Not Designated As Hedging Instruments
Aluminum Futures Contracts
USD ($)
Jun. 30, 2014
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Aluminum Futures Contracts
USD ($)
Jun. 30, 2014
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Accrued Expenses [Member]
Derivatives Designated As Hedging Instruments [Member]
Aluminum Futures Contracts
USD ($)
Derivative [Line Items]                        
Derivative Asset, Fair Value, Gross Asset                 $ 313,000 $ 11,000 $ 47,000 $ 31,000
Derivative Liability, Fair Value, Gross Liability                 9,000     178,000
Notional Amount   6,700,000 8,000,000   2,000,000   2,100,000          
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs   6,700,000 8,400,000                  
Net asset (liability), Fair Value   304,000 (147,000) 11,000   47,000   0        
Amounts of unrealized after-tax losses on derivative instruments $ (200,000)