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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Non-Operating and Non-Recurring Charges [Abstract]        
Unrealized gain (loss) on investment under fair value method     $ (1,100,000) $ 3,200,000
Cost-method investment, OTTI 0 1,018,000 0 1,018,000
Gain (Loss) on Disposition of Assets     837,000 0
kaleo
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Unrealized gain (loss) on investment under fair value method (1,100,000) 2,100,000 (1,100,000) 3,200,000
Unrealized gain (loss) on investment under fair value method, after taxes (700,000) 1,300,000 (700,000) 2,000,000
Aacoa Inc [Member]
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Integration-related expenses and other non-recurring transactions   100,000   200,000
Film Products
        
Restructuring Cost and Reserve [Line Items]        
Pretax charges for severance and other employee-related costs 600,000   1,400,000 100,000
Harbinger Fund
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Cost-method investment, OTTI 300,000   600,000  
Cost-method investment, OTTI net of tax 200,000   400,000  
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing
        
Restructuring Cost and Reserve [Line Items]        
Plant shutdown related expenditures 300,000   700,000  
Pretax charges for severance and other employee-related costs 200,000   400,000  
Pretax loss for asset impairments 100,000   300,000  
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing
        
Restructuring Cost and Reserve [Line Items]        
Plant shutdown related expenditures 24,000 300,000 24,000 500,000
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   100,000
Aluminum Extrusions Manufacturing Facility In Newnan Georgia [Member]
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Environmental Exit Costs, Anticipated Cost 200,000 100,000 200,000 100,000
Alleghany and Bath County, Virginia [Member]
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Gain (Loss) on Disposition of Assets 1,208,000   1,208,000  
Unrealized Gain (Loss) on Investment Property   (1,000,000)    
Gain (Loss) on Sale of Investment Property, After Tax 800,000 (600,000)    
3M vs. Tredegar
        
Other Non-Operating and Non-Recurring Charges [Abstract]        
Litigation Settlement, Amount $ 10,000,000   $ 10,000,000