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Derivative Financial Instruments (Narrative) (Details) | 9 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2013 USD ($) | Sep. 30, 2013 Aluminum Futures Contracts [Member] USD ($) lb | Dec. 31, 2012 Aluminum Futures Contracts [Member] USD ($) lb | Sep. 30, 2013 Film Products [Member] EUR (€) | Dec. 31, 2012 Film Products [Member] EUR (€) | Sep. 30, 2013 Derivatives Not Designated As Hedging Instruments [Member] Aluminum Futures Contracts [Member] USD ($) | Dec. 31, 2012 Derivatives Not Designated As Hedging Instruments [Member] Aluminum Futures Contracts [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount |  | $ 4,600,000 | $ 6,200,000 | € 2,200,000 | € 9,900,000 |  |
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs |  | 4,700,000 | 6,700,000 |  |  |  |
Net asset (liability), Fair Value |  | (218,000) | 138,000 |  |  | 0 | 0
Amounts of unrealized after-tax losses on derivative instruments | $ 100,000 |  |  |  |  |  |

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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=7668309&loc=d3e80748-113994 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
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