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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Other Intangible Assets [Line Items]        
Goodwill, Impairment Loss   $ 0 $ 44,465 $ 0
Goodwill   117,822 117,839 169,687
Identifiable intangible assets:        
Total carrying value of other intangibles   33,601 35,233  
Intangible Assets, Net (Including Goodwill)   151,423 153,072  
Customer relationships        
Identifiable intangible assets:        
Other identifiable intangibles   14,844 15,620  
Finite-Lived Intangible Assets, Gross   26,021 23,766  
Proprietary technology        
Identifiable intangible assets:        
Other identifiable intangibles   7,582 9,037  
Finite-Lived Intangible Assets, Gross   17,366 16,738  
Noncompete agreements        
Identifiable intangible assets:        
Finite-Lived Intangible Assets, Gross   4,154 4,154  
Trade names        
Identifiable intangible assets:        
Trade names   $ 11,175 10,576  
Minimum | Customer relationships        
Identifiable intangible assets:        
Identifiable Intangible Asset, Useful Life (Yrs)   10 years    
Maximum | Customer relationships        
Identifiable intangible assets:        
Identifiable Intangible Asset, Useful Life (Yrs)   12 years    
Maximum | Proprietary technology        
Identifiable intangible assets:        
Identifiable Intangible Asset, Useful Life (Yrs)   15 years    
Flexible Packaging Films [Member] [Domain]        
Goodwill And Other Intangible Assets [Line Items]        
Goodwill, Impairment Loss $ 44,500 $ 0 44,465 0
Goodwill   $ 0 $ 0 $ 51,831
Identifiable intangible assets:        
Goodwill, Impairment Loss, Net of Tax $ 44,500