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Derivative Financial Instruments (Narrative) (Details) | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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