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Summary Of Significant Accounting Policies (Narrative) (Details). - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]        
Interest Costs Capitalized $ 100 $ 100 $ 300  
Foreign Currency Transaction Gain (Loss), before Tax 500 600 600  
Cash and cash equivalents 30,521 11,846 31,422 $ 34,397
Goodwill, Impairment Loss 0 13,696 0  
Goodwill, Impairment Loss, Net of Tax   10,500    
Goodwill $ 70,608 $ 67,708 $ 81,404  
Incremental shares excluded from the calculation of incremental shares attributable to stock options and restricted stock 1,582,222 1,212,375 209,592  
Asset Impairment Charges $ 0 $ 52,326 $ 0  
Cash 30,500 11,800    
Cash, Period Increase (Decrease) 3,800      
Defined benefit plan estimated required future employer contributions in next fiscal year 50,000      
Foreign Country        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 16,400 9,400    
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      
Aluminum Extrusions        
Summary Of Significant Accounting Policies [Line Items]        
Goodwill, Impairment Loss $ 0 13,696 0  
Goodwill $ 13,270 10,370 $ 24,066  
Asset Impairment Charges   $ (10,000)