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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Alleghany And Bath County, Virginia [Member] | Jun. 30, 2013 Alleghany And Bath County, Virginia [Member] | Jun. 30, 2013 Intelliject [Member] | Jun. 30, 2012 Intelliject [Member] | Jun. 30, 2013 Intelliject [Member] | Jun. 30, 2012 Intelliject [Member] | Jun. 30, 2013 Facility Closing [Member] | Jun. 30, 2012 Facility Closing [Member] | Jun. 30, 2013 Facility Closing [Member] | Jun. 30, 2012 Facility Closing [Member] | Jun. 30, 2013 Aluminum Extrusions [Member] | Jun. 30, 2013 Aluminum Extrusions [Member] | Jun. 30, 2012 Aluminum Extrusions [Member] | Jun. 30, 2013 Film Products [Member] | Jun. 30, 2012 Film Products [Member] | Jun. 30, 2013 Film Products [Member] | Jun. 30, 2012 Film Products [Member] | Mar. 31, 2012 Harbinger Fund [Member] | Jun. 30, 2012 Terphane [Member] | Jun. 30, 2012 Terphane [Member] | Jun. 30, 2013 AACOA [Member] | Jun. 30, 2013 AACOA [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant shutdown related expenditures |  |  |  |  |  |  |  |  | $ 300,000 | $ 1,000,000 | $ 500,000 | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation |  |  |  |  |  |  |  |  |  | 1,200,000 |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Other shutdown-related charges |  |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Effect of LIFO Inventory Liquidation on Income |  |  |  |  |  |  |  |  |  | 500,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Integration-related expenses and other non-recurring transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 900,000 | 100,000 | 200,000
Loss on sale of previously impaired machinery and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 |  |  |  |  |  |
Expected future environmental costs |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |
Pretax loss for asset impairments | 1,018,000 | 1,942,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  | 800,000 |  |  |  |  |
Pretax charges for severance and other employee-related costs |  | 300,000 |  |  |  |  |  |  |  | 400,000 |  | 1,000,000 |  |  | 200,000 |  | 100,000 | 100,000 | 100,000 |  |  |  |  |
Unrealized gain (loss) on investment under fair value method | 3,200,000 | 6,300,000 |  |  | 2,100,000 | 2,700,000 | 3,200,000 | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method, after taxes |  |  |  |  | 1,300,000 | 1,700,000 | 2,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost-method investment, OTTI |  |  | 1,018,000 | 1,018,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |
Cost-method investment, OTTI net of tax |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |

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- Definition Costs incurred to related to a business combination which have been expensed during the period. Such costs include business integration costs and other non-recurring expenses directly related to the acquired entity that are not considered to be part of ongoing operations. + References No definition available. + Details
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