Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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%