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Basis Of Presentation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Business Exit Costs     $ 1,700    
Restructuring and Related Cost, Accelerated Depreciation     3,700    
Goodwill, Impairment Loss $ 19,478 $ 0 34,891 $ 0  
Goodwill 35,717   35,717   $ 70,608
Severance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Business Exit Costs     800    
Operating Expense          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Business Exit Costs     600    
Other Expense          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Business Exit Costs     300    
Surface Protection Films [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Goodwill, Impairment Loss 19,500        
Goodwill, Impairment Loss, Net of Tax 15,100        
Goodwill $ 22,400   $ 22,400   $ 57,300