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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | $ 400,000 |  | $ 1,800,000 |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method |  |  | 2,900,000 | 100,000
Cost-method investment, OTTI | 0 | 0 | 0 |
Gain (Loss) on Disposition of Assets |  |  | 919,000 | 0
Harbinger Fund |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Cost-method investment, OTTI | 200,000 | 200,000 | 800,000 | 200,000
Cost-method investment, OTTI net of tax | 100,000 | 100,000 | 500,000 | 100,000
kaleo |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Unrealized gain (loss) on investment under fair value method | 4,000,000 | (3,100,000) | 2,900,000 | 100,000
Unrealized gain (loss) on investment under fair value method, after taxes | 2,500,000 | (1,900,000) | 1,800,000 | 100,000
Aacoa Inc [Member] |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Integration-related expenses and other non-recurring transactions |  |  |  | 200,000
Film Products |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | 400,000 | 200,000 | 1,800,000 | 300,000
Aluminum Extrusions |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pretax charges for severance and other employee-related costs | 31,000 |  | 31,000 |
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Plant shutdown related expenditures |  |  | 800,000 |
Pretax charges for severance and other employee-related costs |  |  | 500,000 |
Pretax loss for asset impairments | 37,000 |  | 300,000 |
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Plant shutdown related expenditures | 20,000 | 45,000 | 43,000 | 600,000
Film Products Manufacturing Facility In Shanghai, China [Member] |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 100,000
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member] |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Environmental Exit Costs, Anticipated Cost | 75,000 | 100,000 | 200,000 | 200,000
Alleghany and Bath County, Virginia [Member] |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Cost-method investment, OTTI |  |  |  | 1,018,000
Gain (Loss) on Disposition of Assets | 0 |  | 1,208,000 |
Unrealized Gain (Loss) on Investment Property |  |  |  | (1,018,000)
Gain (Loss) on Sale of Investment Property, After Tax |  |  | 800,000 |
Unrealized Gain Loss On Investment Property After Tax |  |  |  | (600,000)
3M vs. Tredegar |  |  |  |
Other Non-Operating and Non-Recurring Charges [Abstract] |  |  |  |
Litigation Settlement, Amount | $ 10,000,000 |  | $ 10,000,000 |

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