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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
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