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Derivative Financial Instruments (Narrative) (Details) | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 USD ($) | Mar. 31, 2013 Aluminum Futures Contracts [Member] USD ($) lb | Dec. 31, 2012 Aluminum Futures Contracts [Member] USD ($) lb | Mar. 31, 2013 Film Products [Member] EUR (€) | Dec. 31, 2012 Film Products [Member] EUR (€) | Mar. 31, 2013 Derivatives Not Designated as Hedging Instruments Aluminum Futures Contracts [Member] USD ($) | Dec. 31, 2012 Derivatives Not Designated as Hedging Instruments Aluminum Futures Contracts [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount |  | $ 6,200,000 | $ 6,200,000 | € 9,900,000 | € 9,900,000 |  |
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs |  | 6,800,000 | 6,700,000 |  |  |  |
Offsetting asset position for derivatives |  |  |  |  |  | 0 | 0
Offsetting liability position for derivatives |  |  |  |  |  | 0 | 0
Amounts of unrealized after-tax losses on derivative instruments | $ 200,000 |  |  |  |  |  |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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