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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Specialty Pharmaceutical Company [Member]
Sep. 30, 2012
Specialty Pharmaceutical Company [Member]
Sep. 30, 2012
Manufacturing Facility In LaGrange, Georgia [Member]
Feb. 12, 2008
Aluminum Extrusions [Member]
Sep. 30, 2012
Restructurings In Aluminum Extrusions [Member]
Sep. 30, 2012
Facility Closing [Member]
Sep. 30, 2012
Facility Closing [Member]
Sep. 30, 2012
Restructurings In Film Products [Member]
Sep. 30, 2011
Film Products [Member]
Sep. 30, 2011
Film Products [Member]
Mar. 31, 2012
Harbinger Fund [Member]
Sep. 30, 2012
Terphane [Member]
Sep. 30, 2012
Terphane [Member]
Sep. 30, 2011
Terphane [Member]
Film Products [Member]
Sep. 30, 2011
Terphane [Member]
Film Products [Member]
Sep. 30, 2012
AACOA [Member]
Sep. 30, 2012
AACOA [Member]
Restructuring Cost and Reserve [Line Items]                                            
Accelerated depreciation                     $ 600,000 $ 2,400,000                    
Pretax charges for severance and other employee-related costs     300,000             200,000 200,000 1,200,000 71,000 200,000 500,000              
Other shutdown-related charges                     700,000 900,000                    
Integration-related expenses and other non-recurring transactions                                 100,000 1,000,000        
Pretax charges for asset impairments     1,942,000 798,000       800,000             800,000              
Pretax gains (losses) for timing differences between the recognition of realized losses   (43,000)   19,000                                    
Unrealized gain (loss) on investment under fair value method     9,000,000     2,700,000 9,000,000                              
Unrealized gain (loss) on investment under fair value method, after taxes           1,700,000 5,700,000                              
Foreign currency translation gains                           4,300,000 4,300,000              
Pretax charges for acquisition-related expenses                                     2,300,000 2,300,000 300,000 300,000
Pretax gain on the divestiture of film products business                           1,000,000 1,000,000              
Incurred restructuring and related costs                     700,000 2,700,000                    
Effect of LIFO Inventory Liquidation on Income                     500,000 1,500,000                    
Gains on sale of equipment                     300,000 300,000                    
Proceeds from sale of business                 25,000,000                          
Adjustment amounts previously accrued for environmental obligations, before income tax     11,900,000   4,400,000                                  
Adjustment amounts previously accrued for environmental obligations, net of tax 7,100,000   11,900,000   4,400,000                                  
Cost-method investment, OTTI                               1,100,000            
Cost-method investment, OTTI net of tax                               $ 700,000