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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