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Debt And Credit Agreements (Narrative) (Details)
$ in Thousands, ¥ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Rate
Dec. 31, 2024
CNY (¥)
Rate
Dec. 31, 2023
USD ($)
Dec. 27, 2023
USD ($)
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity | $       $ 180,000
Line of Credit, Maximum Borrowing Capacity after Modification | $ $ 180,000      
Line of Credit, Maximum Borrowing Capacity after ABL Adjustment Date | $ 125,000      
Available credit under the Credit Agreement | $ 43,800      
Short-Term Debt | $ $ 1,322   $ 126,322  
Cash Dominion Availability after ABL Adjustment Date | Rate 12.50% 12.50%    
Minimum Availability before ABL Adjustment Date | Rate 10.00% 10.00%    
Minimum Availability after ABL Adjustment Date | Rate 20.00% 20.00%    
Line of Credit Facility, percent borrowing capacity | Rate 35.00% 35.00%    
Unfunded Non-Qualified Supplemental Pension Plan        
Line of Credit Facility [Line Items]        
Projected benefit obligation to unfunded plan | $ $ 1,500   $ 1,600  
Guangzhou Tredegar Loan        
Line of Credit Facility [Line Items]        
Debt Instrument, Basis Spread on Variable Rate | Rate 0.45%      
Other Borrowings $ 1,300 ¥ 9.5    
Debt Instrument, Interest Rate, Stated Percentage | Rate 3.45% 3.45%    
Debt Instrument, Collateral Amount | ¥   ¥ 30.0