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Short-Term Debt (Details) - USD ($) $ in Thousands | Mar. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Short Term Debt [Line Items] |  |  |
Short-term debt |  | $ 11,579 | $ 0
Glatfelter Gernsbach GmbH |  |  |
Short Term Debt [Line Items] |  |  |
Short-term debt | $ 11,700 |  |
Short-term debt, lender | Commerzbank AG |  |
Fixed interest rate of borrowings | 0.75% |  |

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