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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]        
Foreign Currency Transaction Gain (Loss), before Tax $ 400 $ 500 $ 600  
Cash 19,200 30,500    
Cash and cash equivalents 19,232 30,521    
Goodwill 70,608 70,608 67,708  
Goodwill impairment 0 $ 0 $ 13,696  
Defined benefit plan estimated required future employer contributions in next fiscal year $ 50,000      
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock 2,760,983 1,582,222 1,212,375  
Pension Benefits        
Summary Of Significant Accounting Policies [Line Items]        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax $ 103,998 $ 109,893 $ 150,267  
Surface protection films        
Summary Of Significant Accounting Policies [Line Items]        
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount       18.60%
Goodwill 57,300      
Long-Lived Assets $ 29,300      
Aacoa [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Goodwill impairment   13,700    
Goodwill, Impairment Loss, Net of Tax   10,500    
Minimum | Buildings And Land Improvements        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 5 years      
Minimum | Machinery and Equipment        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 2 years      
Maximum | Buildings And Land Improvements        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 40 years      
Maximum | Machinery and Equipment        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life 20 years      
Foreign Country        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 10,300 $ 16,400