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Derivative Financial Instruments (Narrative) (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2014
Aluminum Futures Contracts
USD ($)
lb
Dec. 31, 2013
Aluminum Futures Contracts
USD ($)
lb
Sep. 30, 2014
Film Products Foreign Currency Contract Forward Contract
USD ($)
Sep. 30, 2014
Film Products Foreign Currency Contract Forward Contract
EUR (€)
Dec. 31, 2013
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Film Products Foreign Currency Contract Forward Contract
EUR (€)
Sep. 30, 2014
Derivatives Not Designated As Hedging Instruments
Aluminum Futures Contracts
USD ($)
Sep. 30, 2014
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Aluminum Futures Contracts
USD ($)
Sep. 30, 2014
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Prepaid Expenses And Other
Derivatives Designated As Hedging Instruments [Member]
Film Products Foreign Currency Contract Forward Contract
USD ($)
Sep. 30, 2014
Accrued Expenses [Member]
Derivatives Not Designated As Hedging Instruments
Film Products Foreign Currency Contract Forward Contract
USD ($)
Dec. 31, 2013
Accrued Expenses [Member]
Derivatives Not Designated As Hedging Instruments
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                 $ 357,000 $ 0 $ 47,000     $ 31,000
Derivative Liability, Fair Value, Gross Liability                 33,000     112,000 0 178,000
Notional Amount   4,900,000 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   4,700,000 8,400,000                      
Net asset (liability), Fair Value   324,000 (147,000) (112,000)   47,000   0            
Amounts of unrealized after gains (losses) on derivative instruments $ 400,000