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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 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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Feb. 12, 2008 | Mar. 31, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Specialty Pharmaceutical Company [Member] | Jun. 30, 2012 Specialty Pharmaceutical Company [Member] | Jun. 30, 2012 Manufacturing Facility In LaGrange, Georgia [Member] | Jun. 30, 2012 Manufacturing Facility In LaGrange, Georgia [Member] | Jun. 30, 2012 Restructurings In Aluminum Extrusions [Member] | Jun. 30, 2012 Facility Closing [Member] | Jun. 30, 2012 Facility Closing [Member] | Jun. 30, 2012 Restructurings In Film Products [Member] | Jun. 30, 2012 Restructurings In Film Products [Member] | Jun. 30, 2011 Film Products [Member] | Jun. 30, 2011 Film Products [Member] | Mar. 31, 2012 Harbinger Fund [Member] | Jun. 30, 2012 Terphane [Member] | Jun. 30, 2012 Terphane [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated depreciation |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 1,900,000 |  |  |  |  |  |  |
Pretax charges for severance and other employee-related costs |  |  |  | 300,000 |  |  |  |  |  |  | 200,000 | 400,000 | 1,000,000 | 71,000 | 71,000 | 300,000 | 300,000 |  |  |
Other shutdown-related charges |  |  |  |  |  |  |  |  |  |  |  | 70,000 | 100,000 |  |  |  |  |  |  |
Integration-related expenses and other non-recurring transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 900,000
Pretax charges for asset impairments |  |  |  | 1,942,000 | 798,000 |  |  |  | 800,000 | 800,000 |  |  |  |  |  | 800,000 | 800,000 |  |  |
Pretax gains (losses) for timing differences between the recognition of realized losses |  |  | 94,000 |  | 62,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  |  | 6,300,000 |  |  | 2,700,000 | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investment under fair value method, after taxes |  |  |  |  |  |  | 1,700,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of aluminum extrusions business | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incurred restructuring and related costs |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,900,000 |  |  |  |  |  |  |
Effect of LIFO Inventory Liquidation on Income |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 1,000,000 |  |  |  |  |  |  |
Adjustment amounts previously accrued for environmental obligations, before income tax |  | 4,800,000 |  |  |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment amounts previously accrued for environmental obligations, net of tax |  | 4,800,000 | 300,000 |  |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost-method investment, OTTI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Cost-method investment, OTTI net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |

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