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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 |  |

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