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Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 12 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
Feb. 12, 2008
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Specialty Pharmaceutical Company [Member]
Jun. 30, 2012
Specialty Pharmaceutical Company [Member]
Jun. 30, 2012
Manufacturing Facility In LaGrange, Georgia [Member]
Jun. 30, 2012
Manufacturing Facility In LaGrange, Georgia [Member]
Jun. 30, 2012
Restructurings In Aluminum Extrusions [Member]
Jun. 30, 2012
Facility Closing [Member]
Jun. 30, 2012
Facility Closing [Member]
Jun. 30, 2012
Restructurings In Film Products [Member]
Jun. 30, 2012
Restructurings In Film Products [Member]
Jun. 30, 2011
Film Products [Member]
Jun. 30, 2011
Film Products [Member]
Mar. 31, 2012
Harbinger Fund [Member]
Jun. 30, 2012
Terphane [Member]
Jun. 30, 2012
Terphane [Member]
Restructuring Cost and Reserve [Line Items]                                        
Accelerated depreciation                       $ 1,200,000 $ 1,900,000              
Pretax charges for severance and other employee-related costs       300,000             200,000 400,000 1,000,000 71,000 71,000 300,000 300,000      
Other shutdown-related charges                       70,000 100,000              
Integration-related expenses and other non-recurring transactions                                     600,000 900,000
Pretax charges for asset impairments       1,942,000 798,000       800,000 800,000           800,000 800,000      
Pretax gains (losses) for timing differences between the recognition of realized losses     94,000   62,000                              
Unrealized gain (loss) on investment under fair value method       6,300,000     2,700,000 6,300,000                        
Unrealized gain (loss) on investment under fair value method, after taxes             1,700,000 4,000,000                        
Proceeds from sale of aluminum extrusions business 25,000,000                                      
Incurred restructuring and related costs                       1,000,000 1,900,000              
Effect of LIFO Inventory Liquidation on Income                       500,000 1,000,000              
Adjustment amounts previously accrued for environmental obligations, before income tax   4,800,000       4,400,000                            
Adjustment amounts previously accrued for environmental obligations, net of tax   4,800,000 300,000     4,400,000                            
Cost-method investment, OTTI                                   1,100,000    
Cost-method investment, OTTI net of tax                                   $ 700,000