Magnera (MAGN) 10-K 28 Feb 24 2023 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 26, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity Address, Address Line One	4350 Congress Street
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28209
City Area Code	704
Local Phone Number	885-2555
Entity File Number	1-03560
Entity Registrant Name	Glatfelter Corporation
Entity Tax Identification Number	23-0628360
Entity Incorporation, State or Country Code	PA
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	GLT
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 112.7
Entity Common Stock, Shares Outstanding		45,147,547
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement to be delivered to shareholders in connection with the Annual Meeting of Shareholders to be held on May 10, 2024 are incorporated by reference into Part III.
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000041719

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Firm ID	34
Auditor Name	DELOITTE & TOUCHE LLP
Auditor Location	Charlotte, North Carolina

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales	$ 1,385,516	$ 1,491,326	$ 1,084,694
Costs of products sold	1,255,809	1,342,524	939,899
Gross profit	129,707	148,802	144,795
Selling, general and administrative expenses	109,741	125,001	121,250
Goodwill and other asset impairment charges	0	190,556	0
Loss on sale of Ober-Schmitten and other non-strategic operation	18,365	0	0
Gains on dispositions of plant, equipment and timberlands, net	(1,111)	(2,804)	(5,069)
Operating income (loss)	2,712	(163,951)	28,614
Non-operating income (expense)
Interest expense	(64,739)	(33,207)	(12,353)
Interest income	1,486	408	73
Other, net	(10,551)	(7,642)	(2,657)
Total non-operating expense	(73,804)	(40,441)	(14,937)
Income (loss) before income taxes	(71,092)	(204,392)	13,677
Income tax provision (benefit)	7,011	(10,275)	6,956
Income (loss) from continuing operations	(78,103)	(194,117)	6,721
Discontinued operations:
Income (loss) before income taxes	(950)	(91)	216
Income tax provision	0	0	0
Income (loss) from discontinued operations	(950)	(91)	216
Net income (loss)	$ (79,053)	$ (194,208)	$ 6,937
Basic earnings (loss) per share
Income (loss) from continuing operations (in dollars per share)	$ (1.73)	$ (4.33)	$ 0.15
Loss from discontinued operations (in dollars per share)	(0.02)	0	0
Basic earnings per share (in dollars per share)	(1.75)	(4.33)	0.15
Diluted earnings (loss) per share
Income (loss) from continuing operations (in dollars per share)	(1.73)	(4.33)	0.15
Loss from discontinued operations (in dollars per share)	(0.02)	0	0
Diluted earnings per share (in dollars per share)	$ (1.75)	$ (4.33)	$ 0.15
Weighted average shares outstanding
Basic (in shares)	45,058	44,828	44,551
Diluted (in shares)	45,058	44,828	44,924

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (79,053)	$ (194,208)	$ 6,937
Foreign currency translation adjustments	15,509	(36,485)	(27,232)
Net change in:
Deferred gains (losses) on derivatives, net of taxes of $429, $(2,513), and (1,866), respectively	(621)	9,188	4,484
Unrecognized retirement obligations, net of taxes of $41, $(898), and (111), respectively	498	9,706	1,097
Other comprehensive income (loss)	15,386	(17,591)	(21,651)
Comprehensive loss	$ (63,667)	$ (211,799)	$ (14,714)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Taxes on deferred gains (losses) on derivatives	$ 429	$ (2,513)	$ (1,866)
Taxes on unrecognized retirement obligations	$ 41	$ (898)	$ (111)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 50,265	$ 110,660
Accounts receivable (less allowance for doubtful accounts: 2023 - $2,638; 2022 - $5,025)	170,974	195,665
Inventories	298,248	309,436
Prepaid expenses and other current assets	86,480	63,723
Total current assets	605,967	679,484
Plant, equipment and timberlands, net	662,916	675,811
Goodwill	107,691	105,195
Intangible assets, net	106,333	108,670
Other assets	80,889	78,193
Total assets	1,563,796	1,647,353
Liabilities and Shareholders' Equity
Current portion of long-term debt	1,005	40,435
Short-term debt	6,150	11,422
Accounts payable	158,455	217,625
Environmental liabilities	2,000	2,200
Other current liabilities	112,758	88,724
Total current liabilities	280,368	360,406
Long-term debt	853,163	793,252
Deferred income taxes	52,219	54,388
Other long-term liabilities	121,192	121,303
Total liabilities	1,306,942	1,329,349
Commitments and contingencies	0	0
Shareholders’ equity
Common stock, $0.01 par value; authorized - 120,000,000; issued - 54,361,980 (including treasury shares: 2023 - 9,275,061; 2022 - 9,568,457)	544	544
Capital in excess of par value	58,759	60,663
Retained earnings	419,810	498,863
Accumulated other comprehensive loss	(82,509)	(97,895)
Shareholders' equity before treasury stock	396,604	462,175
Less cost of common stock in treasury	(139,750)	(144,171)
Total shareholders’ equity	256,854	318,004
Total liabilities and shareholders’ equity	$ 1,563,796	$ 1,647,353

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,638	$ 5,025
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	120,000,000	120,000,000
Common stock, issued (in shares)	54,361,980	54,361,980
Treasury stock (in shares)	9,275,061	9,568,457

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income (loss)	$ (79,053)	$ (194,208)	$ 6,937
Income (loss) from discontinued operations, net of tax	950	91	(216)
Adjustments to reconcile to net cash provided (used) by operating activities:
Depreciation, depletion and amortization	63,247	66,724	61,421
Amortization of debt issue costs and original issue discount	5,316	1,915	865
Loss on sale of Ober-Schmitten and other non-strategic operation	18,365	0	0
Pension settlement charge	633	0	0
Goodwill and other asset impairment charges	0	190,556	0
Russia/Ukraine conflict charges/(recovery)	(1,441)	3,207	0
Deferred income tax benefit	(12,176)	(24,022)	(13,619)
Gains on dispositions of plant, equipment and timberlands, net	(1,111)	(2,804)	(5,069)
Share-based compensation	2,797	831	5,063
Non-cash inventory charge	3,262	0	0
Change in operating assets and liabilities
Accounts receivable	21,634	(35,294)	(14,794)
Inventories	9,605	(44,430)	(40,019)
Prepaid and other current assets	165	(3,234)	5,770
Accounts payable	(62,686)	16,398	65,828
Accruals and other current liabilities	5,240	(14,342)	(4,165)
Other	(363)	(2,208)	2,975
Net cash provided (used) by operating activities	(25,616)	(40,820)	70,977
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(33,770)	(37,740)	(30,037)
Proceeds from disposals of plant, equipment and timberlands, net	1,676	3,199	5,567
Payments related to sale of Ober-Schmitten and other non-strategic operation	(5,851)	0	0
Acquisitions, net of cash acquired	0	1,413	(464,856)
Other	844	30	(440)
Net cash used by investing activities	(37,101)	(33,098)	(489,766)
Financing activities
Proceeds from note offerings	0	0	500,000
Proceeds from term loans	262,273	0	46,849
Repayment of term loans	(228,413)	(35,287)	(26,088)
Net borrowings (repayments) under revolving credit facility	(22,884)	103,519	(23,481)
Payments of borrowing costs	(11,645)	(1,285)	(10,132)
Payments of dividends	0	(18,766)	(24,458)
Proceeds from government grants	0	0	479
Payments related to share-based compensation awards and other	(280)	(1,262)	(817)
Net cash provided (used) by financing activities	(949)	46,919	462,352
Effect of exchange rate changes on cash	1,033	(2,341)	(5,418)
Net increase (decrease) in cash, cash equivalents and restricted cash	(62,633)	(29,340)	38,145
Change in cash and cash equivalents from discontinued operations	(1,169)	(312)	(996)
Cash, cash equivalents and restricted cash at the beginning of period	119,162	148,814	111,665
Cash, cash equivalents and restricted cash at the end of period	55,360	119,162	148,814
Less: restricted cash in Prepaid and other current assets	(4,300)	(3,600)	(2,000)
Less: restricted cash in Other assets	(795)	(4,902)	(8,378)
Cash and cash equivalents at the end of period	50,265	110,660	138,436
Cash paid for:
Interest, net of amounts capitalized	59,182	33,203	6,957
Income taxes, net	$ 9,424	$ 24,445	$ 15,500

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance at Dec. 31, 2020	$ 577,932	$ 544	$ 63,261	$ 723,365	$ (58,653)	$ (150,585)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,937			6,937
Other comprehensive (loss) income	(21,651)				(21,651)
Comprehensive (loss) income	(14,714)
Cash dividends declared	(24,702)			(24,702)
Share-based compensation expense	5,063		5,063
Delivery of treasury shares:
RSUs and PSAs	(815)		(3,538)			2,723
Employee stock options exercised — net	(2)		(7)			5
Ending balance at Dec. 31, 2021	542,762	544	64,779	705,600	(80,304)	(147,857)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(194,208)			(194,208)
Other comprehensive (loss) income	(17,591)				(17,591)
Comprehensive (loss) income	(211,799)
Cash dividends declared	(12,529)			(12,529)
Share-based compensation expense	831		831
Delivery of treasury shares:
RSUs and PSAs	(1,261)		(4,947)			3,686
Ending balance at Dec. 31, 2022	318,004	544	60,663	498,863	(97,895)	(144,171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(79,053)			(79,053)
Other comprehensive (loss) income	15,386				15,386
Comprehensive (loss) income	(63,667)
Share-based compensation expense	2,797		2,797
Delivery of treasury shares:
RSUs and PSAs	(280)		(4,701)			4,421
Ending balance at Dec. 31, 2023	$ 256,854	$ 544	$ 58,759	$ 419,810	$ (82,509)	$ (139,750)

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.28	$ 0.56

Organization

Organization	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	ORGANIZATION Glatfelter Corporation and subsidiaries (“Glatfelter”) produce and supply high quality, technology-driven, innovative, and customizable nonwovens solutions which can be found in products that are Enhancing Everyday Life®. These include personal care and hygiene products, food and beverage filtration, critical cleaning products, medical and personal protection, packaging products, as well as home improvement and industrial applications. Headquartered in Charlotte, NC, our 2023 net sales were approximately $1.4 billion. At December 31, 2023, we employed approximately 2,980 employees worldwide. Glatfelter’s operations utilize a variety of manufacturing technologies including airlaid, wetlaid and spunlace with fifteen manufacturing sites located in the United States, Canada, Germany, the United Kingdom, France, Spain, and the Philippines. The Company has sales offices in all major geographies serving customers under the Glatfelter and Sontara brands. The terms “we,” “us,” “our,” “the Company,” or “Glatfelter,” refer to Glatfelter Corporation and subsidiaries unless the context indicates otherwise.

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Accounting Policies	ACCOUNTING POLICIES Principles of Consolidation The consolidated financial statements include the accounts of Glatfelter and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. Reclassification of Prior Year Presentation Certain prior year amounts in the footnotes to the consolidated financial statements have been reclassified to conform to the current year presentation. Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies as of the balance sheet date and the reported amounts of net sales and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes that actual results may differ from those estimates and assumptions. Discontinued Operations The results of operations for the Specialty Papers business have been classified as discontinued operations for all periods presented in the consolidated statements of income (loss). Cash and Cash Equivalents We classify all highly liquid instruments with an original maturity of three months or less at the time of purchase as cash equivalents. Inventories Our inventories are stated at the lower of cost or net realizable value. Raw materials, in-process and finished goods inventories are valued principally using the average-cost method. Plant, Equipment and Timberlands For financial reporting purposes, depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows: Buildings 15 – 45 years Machinery and equipment 5 – 40 years Other 3 – 25 years Maintenance and Repairs Maintenance and repairs costs are charged to income and major renewals and improvements are capitalized. At the time property is retired or sold, the net carrying value is eliminated and any resultant gain or loss is included in income. Valuation of Long-lived Assets, Intangible Assets and Goodwill We evaluate long-lived assets for impairment when a specific event indicates that the carrying value of an asset may not be recoverable. Recoverability is assessed based on estimates of future cash flows expected to result from the use and eventual disposition of the asset. If the sum of expected undiscounted cash flows is less than the carrying value of the asset, the asset’s fair value is estimated, and an impairment loss is recognized for the amount by which the carrying value exceeds the estimated fair value. Goodwill and indefinite-lived intangible assets are not amortized and, therefore, are reviewed for impairment annually, during the fourth quarter, or more frequently if impairment indicators are present. The fair value of our reporting units, which are also our operating segments, is determined using a market approach and a discounted cash flow model. The fair value of non-amortizing tradename intangible assets is determined using a discounted cash flow model and requires the use and analysis of significant assumptions including among others, estimated cash flows consistent with our long-term strategic plan, perpetuity growth rates, capital expenditures, and discount rates. In addition, the discounted cash flow model requires the use of significant judgement to assess the potential impact of macroeconomic conditions including raw material and energy prices in all three segments, logistics costs, competition and similar factors. For goodwill, impairment losses, if any, are recognized for the amount by which the carrying value of the reporting unit exceeds its fair value. The carrying value of a reporting unit is defined using an enterprise premise which is generally determined by the difference between the unit’s assets and operating liabilities. With respect to non-amortizing tradenames, impairment losses, if any, are recognized for the amount by which the carrying value of the tradename exceeds its fair value. For additional information, refer to Note 6 – “ Goodwill and Asset Impairments. “ Income Taxes Income taxes are determined using the asset and liability method of accounting for income taxes in accordance with FASB ASC 740 Income Taxes (“ASC 740”). Under ASC 740, tax expense includes U.S. and international income taxes plus the provision for U.S. taxes on undistributed earnings of international subsidiaries not deemed to be permanently invested. Tax credits and other incentives reduce tax expense in the year the credits are claimed. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported in deferred income taxes. Deferred tax assets are recognized if it is more likely than not that the assets will be realized in future years. We establish a valuation allowance for deferred tax assets for which realization is not more likely than not. Significant judgment is required in determining our worldwide provision for income taxes and recording the related assets and liabilities. In the ordinary course of our business, there are many transactions and calculations where the ultimate tax determination is less than certain. We and our subsidiaries are examined by various Federal, State, and foreign tax authorities. We regularly assess the potential outcomes of these examinations and any future examinations for the current or prior years in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and record any necessary adjustments in the period in which the facts that give rise to a revision become known. Investment tax credits are accounted for by the flow-through method, which results in recognition of the benefit in the year in which the credit become available. We account for global intangible low-taxed income (“GILTI”) tax in the period in which it is incurred. The GILTI provisions require entities to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiaries’ tangible assets. Treasury Stock Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the weighted-average cost basis. Foreign Currency Translation Foreign currency translation gains and losses and the effect of exchange rate changes on transactions designated as hedges of net foreign investments are included as a component of other comprehensive income (loss). Transaction gains and losses are included in income in the period in which they occur. Revenue Recognition We recognize revenue, or net sales, in accordance with ASU No. 2014-09, Revenue from Contracts with Customers. Our revenue is earned primarily from the manufacture and sale of engineered materials (“product sales”). Revenue is earned pursuant to contracts, supply agreements and other arrangements with a wide variety of customers. Our performance obligation is to produce a specified product according to technical specifications and, in substantially all instances, to deliver the product. Revenue from product sales is earned at a point in time. We recognize revenue on product sales when we have satisfied our performance obligation and control of the product has passed to the customer thereby entitling us to payment. With respect to substantially all arrangements for product sales, this is deemed to occur when title transfers in accordance with specified shipping terms. Selling prices are fixed at the time the sales arrangement is entered into and payment terms are customary for similar arrangements in our industry. Many of our agreements include customary provisions for volume rebates, discounts and similar incentives. In addition, we are obligated for products that fail to meet agreed upon specification. Provisions for such items are estimated and recorded as sales deductions in the period in which the related revenue is recognized. Refer to Note 8 – “ Revenue ” for additional information about the disaggregation of our net sales. Environmental Liabilities Accruals for losses associated with environmental obligations are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated based on existing legislation and remediation technologies. These accruals are adjusted periodically as assessment and remediation actions continue and/or further legal or technical information develops. Such liabilities are exclusive of any insurance or other claims against third parties. Environmental costs are capitalized if the costs extend the life of the asset, increase its capacity and/or mitigate or prevent contamination from future operations. Recoveries of environmental remediation costs from other parties, including insurance carriers, are recorded as assets when their receipt is assured beyond a reasonable doubt. Earnings Per Share Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted-average common shares outstanding during the respective periods. Diluted earnings per share is computed by dividing net income by the weighted-average common shares and common share equivalents outstanding during the period. In periods in which there is a net loss, diluted loss per share is equal to basic loss per share. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method. Financial Derivatives and Hedging Activities We use financial derivatives to manage exposure to changes in foreign currencies and interest rates. In accordance with FASB ASC 815 Derivatives and Hedging (“ASC 815”), we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. The gain or loss on those derivative instruments designated and qualifying as a hedge of the exposure to variability in expected future cash flows related to forecasted transactions is deferred and reported as a component of accumulated other comprehensive income (loss). Deferred gains or losses are reclassified to our results of operations at the time the hedged forecasted transaction is recorded in our results of operations. The effectiveness of cash flow hedges is assessed at inception and quarterly thereafter. If the instrument matures, is de-designated, becomes ineffective or it becomes probable that the originally forecasted transaction will not occur, the related change in fair value of the derivative instrument is also reclassified from accumulated other comprehensive income (loss) and recognized in earnings. For additional information, refer to Note 22 - " Financial Derivatives and Hedging Activities. " Fair Value of Financial Instruments Under the accounting for fair value measurements and disclosures, a fair value hierarchy was established that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are described below: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 - Inputs that are both significant to the fair value measurement and unobservable. Employee Retention Tax Credit The Coronavirus Aid, Relief, and Economic Security Act of 2020 (“CARES”) and the subsequent related amendments provided a refundable payroll tax credit for eligible wages paid to employees in 2020 and 2021. For 2021, the employee retention credit was equal to 70% of qualified wages paid to U.S. employees in quarters where certain criteria are met. The Company qualified for the employee retention credits for the first and second quarters of 2021 and filed for a cash refund claim in the fourth quarter of 2022. During 2022, the Company recognized an employee retention credit of $8.6 million of which $7.3 million is included in cost of products sold and $1.3 million is included in selling, general and administrative expenses in the accompanying consolidated statement of income (loss). At December 31, 2023 and 2022, we have employee retention credit receivables of $0.1 million and $8.6 million respectively and is included in Prepaid expenses and other current assets in the accompanying consolidated balance sheets. Recently Issued Accounting Pronouncements In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). The standard improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual reporting periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The guidance is to be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). The standard enhances income tax disclosure requirements by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and provides clarification on uncertain tax positions and related financial statement impacts. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITION S On May 13, 2021, we completed the acquisition of all the outstanding equity interests in Georgia-Pacific Mt. Holly LLC, Georgia-Pacific's U.S. nonwovens business ("Mount Holly") for $170.9 million. The Mount Holly acquisition was financed through a combination of cash on hand and borrowings under our revolving credit facility. This business includes the Mount Holly, NC manufacturing facility with annual production capacity of approximately 37,000 metric tons and an R&D center and pilot line for nonwovens product development in Memphis, TN. The Mount Holly facility produces high-quality airlaid products for the wipes, hygiene, and other nonwoven materials markets, competing in the marketplace with nonwoven technologies and substrates, as well as other materials focused primarily on consumer based end-use applications. The facility employs approximately 140 people. Mount Holly’s results are reported prospectively from the acquisition date as part of our Airlaid Materials segment. On October 29, 2021, we completed the acquisition of PMM Holding (Luxembourg) AG, the owner of all of the equity interest in Jacob Holm, a global leading manufacturer of premium quality spunlace nonwoven fabrics for critical cleaning, high-performance materials, personal care, hygiene and medical applications, for approximately $304.0 million for all outstanding shares and the extinguishment of Jacob Holm’s debt.The Jacob Holm acquisition was financed with the proceeds of a private placement of $500.0 million of senior notes discussed in Note 20 - "Long-term Debt." Jacob Holm’s broad product offerings and blue-chip customer base expands our portfolio to include surgical drapes and gowns, wound care, face masks, facial wipes and cosmetic masks. Jacob Holm’s Sontara brand is a leading producer of finished products for critical cleaning wipes and medical apparel, enhances our technological capabilities. Jacob Holm has approximately 760 employees, operates production facilities in the United States, France and Spain, and its revenue in 2020 totaled approximately $400.0 million. The results of Jacob Holm's operations are reported as Spunlace, a newly formed segment, prospectively from the acquisition date. Acquired property, plant and equipment in both acquisitions are being depreciated on a straight-line basis with estimated remaining lives ranging from 5 years to 35 years. Intangible assets recorded in connection with the Mount Holly acquisition consist of customer relationships and are being amortized on a straight-line basis (11 years). With respect to the Jacob Holm acquisition, identifiable intangible assets consist of trade and product names (15 to 20-year life), technical know-how (8 to 20-year life) and customer relationships (20-year life). These assets are being amortized on a straight-line basis. The goodwill arising from the acquisitions largely relates to strategic benefits, product and market diversification, assembled workforce, and similar factors. During 2022, we wrote off the entire amount of goodwill recorded as part of the Jacob Holm acquisition. Additional information is discussed in Note 6 - “Goodwill and Asset Impairments.” Goodwill recorded in connection with the Mount Holly transaction is deductible for federal tax purposes over 15 years. Additional information is discussed in Note 16 - "Goodwill and Intangible Assets." In connection with the Jacob Holm acquisition and as provided for in the underlying Share Purchase Agreement, we recorded a $17.2 million indemnification asset related to certain potential tax liabilities. The indemnification asset is presented above under the caption "Other assets."

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS In 2018, we completed the sale of the Specialty Papers business on a cash free and debt free basis to Pixelle Specialty Solutions LLC, an affiliate of Lindsay Goldberg (the “Purchaser”) for $360 million. The sale of the business was in connection with the strategic focus on our more growth oriented Composite Fibers and Airlaid Materials. We incurred general and administrative expenses of $1.0 million, $0.1 million and a credit of $0.2 million for the years ended 2023, 2022 and 2021, respectively. The amounts incurred in the past three years primarily represent legal costs incurred to pursue certain legal claims, costs related to an insurance claim and reversals of sales and use tax reserves due to the expiration of statutes of limitation. For the years ended December 31, 2023, 2022 and 2021, we have incurred net operating cash outflows of approximately $1.2 million, $0.3 million and $1.0 million, respectively. In the third quarter of 2023 , we sold our Composite Fibers’ Ober-Schmitten, Germany operations as part of the Company’s turnaround strategy that is aimed at improving financial performance of the Company’s overall business. The Company sold the facility for one euro and recognized a loss on the sale of $17.8 million during year ended December 31, 2023. The loss on sale is recapped as follows: In thousands Cash $ 5,793 Accounts receivable 2,950 Inventory 5,039 Prepaids and other current assets 8,847 Property, plant and equipment 2,513 Accounts payable and accrued liabilities (7,337) Loss on sale $ 17,805 In connection with the sale, we entered into a transition services and distribution agreements with the purchaser pursuant to which we agreed to provide various back-office, information technology, commercial and operations support until the business is fully separated from us (estimated to be May 2024).

Sale of Ober-schmitten, Germany

Sale of Ober-schmitten, Germany Facility	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Sale of Ober-schmitten, Germany Facility	DISCONTINUED OPERATIONS In 2018, we completed the sale of the Specialty Papers business on a cash free and debt free basis to Pixelle Specialty Solutions LLC, an affiliate of Lindsay Goldberg (the “Purchaser”) for $360 million. The sale of the business was in connection with the strategic focus on our more growth oriented Composite Fibers and Airlaid Materials. We incurred general and administrative expenses of $1.0 million, $0.1 million and a credit of $0.2 million for the years ended 2023, 2022 and 2021, respectively. The amounts incurred in the past three years primarily represent legal costs incurred to pursue certain legal claims, costs related to an insurance claim and reversals of sales and use tax reserves due to the expiration of statutes of limitation. For the years ended December 31, 2023, 2022 and 2021, we have incurred net operating cash outflows of approximately $1.2 million, $0.3 million and $1.0 million, respectively. In the third quarter of 2023 , we sold our Composite Fibers’ Ober-Schmitten, Germany operations as part of the Company’s turnaround strategy that is aimed at improving financial performance of the Company’s overall business. The Company sold the facility for one euro and recognized a loss on the sale of $17.8 million during year ended December 31, 2023. The loss on sale is recapped as follows: In thousands Cash $ 5,793 Accounts receivable 2,950 Inventory 5,039 Prepaids and other current assets 8,847 Property, plant and equipment 2,513 Accounts payable and accrued liabilities (7,337) Loss on sale $ 17,805 In connection with the sale, we entered into a transition services and distribution agreements with the purchaser pursuant to which we agreed to provide various back-office, information technology, commercial and operations support until the business is fully separated from us (estimated to be May 2024).

Goodwill and Asset Impairments

Goodwill and Asset Impairments	12 Months Ended
	Dec. 31, 2023
Asset Impairment Charges [Abstract]
Goodwill and Asset Impairments	GOODWILL AND ASSET IMPAIRMENTS We recorded no goodwill and asset impairments in 2023. During the fourth quarter of 2022, we recognized a goodwill and asset impairment charge for our Composite Fibers segment of $30.7 million. This charge includes a $20.3 million goodwill impairment for the Composite Fibers segment, primarily driven by higher valuation discount rates despite our expectation of improvements in future financial results compared to our forecast included in our valuation performed in Q1 2022. In addition, we recognized a $10.4 million non-cash asset impairment charge related to our OberSchmitten, Germany facility based on our expectations of future cash flows for this site. The facility was sold in the third quarter of 2023, a s discussed in Note 5 - “Sale of Ober-Schmitten, Germany Facility.” During the third quarter of 2022, we recognized a non-cash goodwill impairment charge for our Spunlace segment of $42.5 million. The Spunlace segment has faced continued inflationary challenges which had escalated since our acquisition of this business in late 2021. Our selling price increases in 2022 were insufficient to offset the impact of inflation. Furthermore, the Spunlace segment has been impacted by unexpected supply chain and other operational issues which, in combination with the commercial issues, resulted in an unexpected increase in operating losses. In the first quarter of 2022, in connection with an assessment of potential impairment of long-lived and indefinite-lived intangible assets stemming from the compounding impacts resulting from the Russia/Ukraine military conflict and related sanctions, we recorded a $117.3 million non-cash asset impairment charge related to Composite Fibers' Dresden facility and an impairment of Composite Fibers' goodwill. Dresden is a single-line facility that produces wallcover base paper, the majority of which is sold into the Russian and Ukrainian markets. As a direct result of the economic impacts from the conflict, and the disruptions in the underlying financial systems and prohibition of the export of sanctioned wallcover base paper to Russia, a charge was recorded to reduce the carrying value of the Dresden fixed assets and intangible assets (technological know-how, customer relationships, and an indefinite-lived trade name), along with Composite Fibers’ goodwill to fair value. The following table summarizes the impairment charges recorded in the accompanying consolidated statements of income (loss) under the caption “Goodwill and other asset impairment charges:” In thousands 2023 2022 2021 Plant, property and equipment $ — $ 37,936 $ — Technological know-how — 18,443 — Customer relationships — 11,695 — Tradename — 3,530 — Goodwill — 118,952 — Total $ — $ 190,556 $ — The fair value of the underlying assets was estimated using discounted cash flow models, independent appraisals and similar methods, all of which are Level 3 fair value classification. As a result of economic sanctions and disruptions to the financial markets, certain Russian and Ukrainian customers were not expected to satisfy outstanding accounts receivables. As such, during 2022, we recognized bad debt expense of approximately $2.9 million directly related to Russian and Ukrainian customers. Furthermore, during 2022, we increased inventory reserves by approximately $0.3 million, primarily related to wallcover products. In 2023, we reversed approximately $1.4 million of bad debt expense based on actual and expected recoveries.

Gain on Dispositions of Plant,

Gain on Dispositions of Plant, Equipment and Timberlands	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Gain on Dispositions of Plant, Equipment and Timberlands	GAIN ON DISPOSITIONS OF PLANT, EQUIPMENT AND TIMBERLANDS During 2023, 2022 and 2021, we completed the following sales of assets: Dollars in thousands Acres Proceeds Gain (loss) 2023 Timberlands 546 $ 1,340 $ 1,305 Other n/a 336 (194) Total $ 1,676 $ 1,111 2022 Timberlands 790 $ 3,130 $ 2,962 Other n/a 69 (158) Total $ 3,199 $ 2,804 2021 Timberlands 1,796 $ 5,567 $ 5,239 Other n/a — (170) Total $ 5,567 $ 5,069

Revenue

Revenue	12 Months Ended
	Dec. 31, 2023
Disaggregation of Revenue [Abstract]
Revenue	REVENUE The following table sets forth disaggregated information pertaining to our net sales from contracts with customers: Year ended December 31, In thousands 2023 2022 2021 Revenue by product category Airlaid Materials Feminine hygiene $ 217,147 $ 238,420 $ 207,116 Specialty wipes 167,702 156,516 110,201 Tabletop 109,293 117,070 76,904 Adult incontinence 29,611 27,102 22,034 Home care 27,424 25,842 25,575 Food pads 13,143 13,787 11,337 Other 22,160 22,777 17,083 586,480 601,514 470,250 Composite Fibers Food & beverage 287,040 309,065 298,859 Technical specialties 74,019 83,225 92,351 Wallcovering 61,607 53,156 88,057 Composite laminates 35,869 43,088 43,438 Metallized 24,982 35,329 34,102 483,517 523,863 556,807 Spunlace Consumer wipes 137,147 154,913 23,937 Critical cleaning 101,725 109,362 16,871 Health care 43,841 55,002 10,785 Hygiene 21,233 23,626 3,428 High performance 12,410 13,438 1,483 Beauty care 1,560 9,608 1,133 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694 Year ended December 31, In thousands 2023 2022 2021 Revenue by geography Airlaid Materials Americas $ 327,200 $ 324,710 $ 237,808 Europe, Middle East and Africa 246,073 263,843 223,718 Asia Pacific 13,207 12,961 8,724 586,480 601,514 470,250 Composite Fibers Europe, Middle East and Africa 278,951 262,750 333,608 Americas 127,805 160,541 134,753 Asia Pacific 76,761 100,572 88,446 483,517 523,863 556,807 Spunlace Americas 203,492 210,812 30,815 Europe, Middle East and Africa 88,132 110,638 19,990 Asia Pacific 26,292 44,499 6,832 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table sets forth the details of basic and diluted earnings (loss) per share (EPS): Year ended December 31, In thousands, except per share 2023 2022 2021 Net income (loss) $ (79,053) $ (194,208) $ 6,937 Weighted average common shares outstanding used in basic EPS 45,058 44,828 44,551 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — — 373 Weighted average common shares outstanding and common share equivalents used in diluted EPS 45,058 44,828 44,924 Earnings (loss) per share Continuing operations $ (1.73) $ (4.33) $ 0.15 Discontinued operations (0.02) — — The following table sets forth the potential common shares outstanding for stock options that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive: Year ended December 31, In thousands 2023 2022 2021 Potential common shares 532 770 1,079

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income	ACCUMULATED OTHER COMPREHENSIVE INCOME The following table sets forth details of the changes in accumulated other comprehensive income (losses) for the three years ended December 31, 2023, 2022 and 2021. In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at January 1, 2023 $ (106,242) $ 11,176 $ (3,247) $ 418 $ (97,895) Other comprehensive income (loss) before reclassifications (net of tax) 15,509 735 (163) (27) 16,054 Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,356) 718 (30) (668) Net current period other comprehensive income (loss) 15,509 (621) 555 (57) 15,386 Balance at December 31, 2023 $ (90,733) $ 10,555 $ (2,692) $ 361 $ (82,509) Balance at January 1, 2022 $ (69,757) $ 1,988 $ (11,482) $ (1,053) $ (80,304) Other comprehensive income (loss) before reclassifications (net of tax) (36,485) 16,716 7,613 1,367 (10,789) Amounts reclassified from accumulated other comprehensive income (net of tax) — (7,528) 622 104 (6,802) Net current period other comprehensive income (loss) (36,485) 9,188 8,235 1,471 (17,591) Balance at December 31, 2022 $ (106,242) $ 11,176 $ (3,247) $ 418 $ (97,895) Balance at January 1, 2021 $ (42,525) $ (2,496) $ (12,844) $ (788) $ (58,653) Other comprehensive income (loss) before reclassifications (net of tax) (27,232) 4,759 611 (79) (21,941) Amounts reclassified from accumulated other comprehensive income (net of tax) — (275) 751 (186) 290 Net current period other comprehensive income (loss) (27,232) 4,484 1,362 (265) (21,651) Balance at December 31, 2021 $ (69,757) $ 1,988 $ (11,482) $ (1,053) $ (80,304) The following table sets forth the amounts reclassified from accumulated other comprehensive income (losses) for the years indicated. Year ended December 31, In thousands 2023 2022 2021 Description Line Item in Statements of Income Cash flow hedges (Note 22) Gains on cash flow hedges $ (1,785) $ (7,896) $ (382) Costs of products sold Tax expense (benefit) 429 703 22 Income tax provision (benefit) Net of tax (1,356) (7,193) (360) Loss (gain) on interest rate swaps — (335) 85 Interest expense Tax expense — — — Income tax provision (benefit) Net of tax — (335) 85 Total cash flow hedges (1,356) (7,528) (275) Retirement plan obligations (Note 13) Amortization of defined benefit pension plan items Prior service costs 23 43 47 Other, net Actuarial losses 81 653 792 Other, net Pension settlement 633 — — 737 696 839 Tax benefit (19) (74) (88) Income tax provision (benefit) Net of tax 718 622 751 Amortization of defined benefit other plan items Prior service costs 21 104 (233) Other, net Actuarial loss (gains) (51) — 47 Other, net (30) 104 (186) Tax expense — — — Income tax provision (benefit) Net of tax (30) 104 (186) Total reclassifications, net of tax $ (668) $ (6,802) $ 290

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Income taxes are recognized for the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The effects of income taxes are measured based on enacted tax laws and rates. The provision for (benefit from) income taxes from continuing operations consisted of the following: Year ended December 31, In thousands 2023 2022 2021 Current taxes Federal $ 2,864 $ (801) $ (570) State 974 239 584 Foreign 15,349 14,309 20,561 19,187 13,747 20,575 Deferred taxes and other Federal (258) (33) (1,159) State (1,233) 477 234 Foreign (10,685) (24,466) (12,694) (12,176) (24,022) (13,619) Income tax provision (benefit) $ 7,011 $ (10,275) $ 6,956 The following are the domestic and foreign components of pretax income (loss) from continuing operations: Year ended December 31, In thousands 2023 2022 2021 United States $ (60,092) $ (63,421) $ (44,682) Foreign (11,000) (140,971) 58,359 Total pretax income (loss) $ (71,092) $ (204,392) $ 13,677 The following table sets forth a reconciliation of the statutory federal income tax rate to our actual effective tax rate for continuing operations. Year ended December 31, 2023 2022 2021 Federal income tax provision at statutory rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit (2.3) (0.6) 2.7 Foreign income tax rate differential (0.1) (4.6) (1.9) Tax effect of tax credits 1.0 0.1 (0.1) Provision for (resolution of) tax matters (6.2) (1.4) 23.6 Rate changes due to enacted legislation (1.3) (0.1) 15.3 Change in reinvestment assertion — — 26.4 Effect of U.S. tax law change (1.3) (0.2) 2.8 Income inclusions from foreign subsidiaries (1.6) (0.6) 18.7 Stock-based compensation (0.5) 0.7 3.9 Nondeductible officer's compensation — (0.3) 3.9 Valuation allowance (30.1) (6.8) (3.1) Tax effect of U.S. impairment — (1.5) — Recognition of non-U.S. intangible tax basis — — (78.1) Capitalized transaction costs — — 8.9 Foreign Attribute Recognition 13.0 — — Other (1.5) (0.6) 6.9 Actual tax rate (9.9) % 5.1 % 50.9 % The effective income tax rate in the year ended December 31, 2023 was impacted by losses in the U.S. and certain foreign jurisdictions for which no income tax benefit was recorded, offset in part by the recognition of a $9.3 million deferred tax benefit associated with a notional interest deduction carryforward at a foreign subsidiary. The lower income tax rate in the year ended December 31, 2022 was largely impacted by the $119.0 million goodwill impairment charge (refer to Note 6), and operating losses in the U.S. and Spunlace operations in France, for which no tax benefit was recorded. The effective income tax rate for the year ended December 31, 2021 was unfavorably impacted by operating losses in the U.S., restructuring and other non-recurring costs for which no tax benefit was recorded. The sources of deferred income taxes were as follows at December 31: In thousands 2023 2022 Reserves $ 391 $ 1,489 Environmental 3,279 3,562 Compensation 2,583 2,687 Pension 1,473 2,323 Post-retirement benefits 749 795 Research & development expenses 6,062 5,986 Inventories 2,635 1,984 Tax carryforwards 101,017 61,828 Interest limitation carryforwards 59,579 9,854 Other 2,540 1,689 Deferred tax assets 180,308 92,197 Valuation allowance (126,516) (52,960) Net deferred tax assets 53,792 39,237 Property (77,518) (79,164) Intangible assets (3,940) (1,549) Inventories — — Other (5,963) (3,591) Deferred tax liabilities (87,421) (84,304) Net deferred tax liabilities $ (33,629) $ (45,067) Non-current deferred tax assets and liabilities are included in the following balance sheet captions: December 31, In thousands 2023 2022 Other assets $ 18,590 $ 9,321 Deferred income taxes 52,219 54,388 At December 31, 2023, we had federal, state and foreign tax net operating loss (“NOL”) carryforwards of $124.3 million, $203.2 million, and $260.5 million, respectively. These NOL carryforwards are available to offset future taxable income. $0.8 million of the federal NOL carryforward expires in 2037. The remaining $123.5 million of the federal NOL has an indefinite carryforward and never expires. The state NOL carryforwards expire at various times and in various amounts beginning in 2024. Certain foreign NOL carryforwards begin to expire after 2029. The federal, state, and international NOL carryforwards on the income tax returns filed included unrecognized tax benefits taken in prior years. The deferred tax assets recognized for financial statement purposes for such NOL carryforwards are presented net of these unrecognized tax benefits. In addition, we had various federal tax credit carryforwards totaling $15.0 million which begin to expire in 2035 and state tax credit carryforwards totaling $3.6 million, which begin to expire in 2028. As of December 31, 2023 and 2022, we had a valuation allowance of $126.5 million and $53.0 million, respectively, against net deferred tax assets, primarily due to uncertainty regarding the ability to utilize federal, state and foreign tax NOL carryforwards, federal and foreign interest deduction limitation carryforwards and certain state tax credits. In assessing the need for a valuation allowance, management considers all available positive and negative evidence in its analysis. Based on this analysis, we recorded a valuation allowance for the portion of deferred tax assets where the weight of available evidence indicated it is more likely than not that the deferred tax assets will not be realized. Tax credits and other incentives reduce tax expense in the year the credits are claimed. We recorded tax credits of $0.5 million, $0.7 million and $0.0 million in 2023, 2022 and 2021, respectively, related to research and development credits. At December 31, 2023 and 2022, unremitted earnings of certain subsidiaries outside the United States deemed to be indefinitely reinvested totaled $94.0 million and $130.0 million, respectively. Because the unremitted earnings of those subsidiaries are deemed to be indefinitely reinvested as of December 31, 2023 and because we have no need for or plans to repatriate such earnings, no deferred tax liability has been recognized in our consolidated financial statements with regard to those subsidiaries. In 2021, we designated unremitted earnings of a subsidiary as not indefinitely reinvested. As of December 31, 2023, we have $2.3 million of deferred tax liabilities recorded with regard to the unremitted earnings of that subsidiary. As of December 31, 2023, 2022 and 2021, we had $60.7 million, $56.5 million and $55.7 million of gross unrecognized tax benefits, respectively. As of December 31, 2023, if such benefits were to be recognized, approximately $58.1 million would be recorded as a component of income tax expense, thereby affecting our effective tax rate. A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows: In thousands 2023 2022 2021 Balance at January 1 $ 56,506 $ 55,660 $ 46,259 Increases in tax positions for prior years 51 — 38 Decreases in tax positions for prior years — (995) (638) Acquisition related: Purchase Accounting — — 12,718 Increases in tax positions for current year 5,728 3,644 3,683 Settlements — — — Lapse in statutes of limitation (1,552) (1,803) (6,400) Balance at December 31 $ 60,733 $ 56,506 $ 55,660 We, or one of our subsidiaries, file income tax returns with the United States Internal Revenue Service, as well as various state and foreign authorities. The following table summarizes tax years that remain subject to examination by major jurisdiction: Open Tax Years Jurisdiction Examinations not yet initiated Examination in progress United States Federal 2014, 2015; 2020 - 2023 N/A State 2019 - 2023 N/A Canada (1) 2016 - 2018, 2023 2019-2022 Germany (1) 2020 - 2023 2016-2019 France 2023 2021-2022 United Kingdom 2022-2023 N/A Philippines 2020, 2022-2023 N/A (1) Includes provincial or similar local jurisdictions, as applicable. The amount of income taxes we pay is subject to ongoing audits by federal, state and foreign tax authorities, which often result in proposed assessments. Management performs a comprehensive review of its global tax positions on a quarterly basis and accrues amounts for uncertain tax positions. Based on these reviews and the result of discussions and resolutions of matters with tax authorities and the closure of tax years subject to tax audit, reserves are adjusted as necessary. However, future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are determined or resolved or as such statutes are closed. Due to potential for resolution of federal, state and foreign examinations, and the expiration of various statutes of limitation, it is reasonably possible our gross unrecognized tax benefits may decrease within the next twelve months by a range of zero to $8.4 million. The majority of this range relates to tax positions taken in foreign jurisdictions. We recognize interest and penalties related to uncertain tax positions as income tax expense. The following table summarizes information related to interest and penalties on uncertain tax positions: As of or for the year ended December 31, In thousands 2023 2022 2021 Accrued interest payable $ 6,251 $ 4,767 $ 3,947 Accrued penalties 2,782 2,975 3,020 Interest expense 1,483 820 974 The Organization for Economic Cooperation and Development (“OECD”) reached agreement among various countries to implement a minimum 15% tax rate on certain multinational enterprises, commonly referred to as Pillar Two. The minimum tax directive has been adopted by the EU for implementation by its Member States into national legislation effective for fiscal years beginning after 2023 and may be adopted by other jurisdictions including the U.S. Many countries where we have operations continue to announce changes in their tax laws and regulations based on the Pillar Two principles. We continue to monitor and evaluate the impact of these proposed and enacted legislative changes. Given the uncertainty regarding such proposed legislative changes, the impact of Pillar Two cannot be determined at this time.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION On May 5, 2023, upon Board and shareholder approval, the Glatfelter Corporation 2022 Long-Term Incentive Plan, as Amended and Restated, became effective and is a successor plan to the Glatfelter Corporation 2022 Long-Term Incentive Plan (collectively, the “LTIP”), which was originally effective as of April 27, 2005 and was subsequently amended and restated on May 4, 2017, and May 5, 2022, respectively. The LTIP continues to provide for the issuance of Glatfelter common stock to eligible participants in the form of restricted stock units, restricted stock awards, non-qualified stock options, performance shares, incentive stock options and performance units. Furthermore, the LTIP increased the number shares previously available for issuance by 675,000 shares. As of December 31, 2023, there were 2,385,486 shares of common stock available for future issuance under the LTIP. Pursuant to terms of the LTIP, we have issued to eligible participants restricted stock units (“RSUs”), performance share awards (“PSAs”) and stock-only stock appreciation rights (“SOSARs”). Restricted Stock Units (“RSUs”) and Performance Share Awards (“PSAs”) Awards of RSUs and PSAs are made under our LTIP. The vesting of RSUs is generally based on the passage of time, generally over a three-year period or in certain instances the RSUs were issued with three-year cliff vesting. PSAs are issued to members of management and vesting is based on achievement of cumulative financial performance targets covering a two-year period followed by an additional one-year service period. The performance measures include a minimum, target and maximum performance level providing the grantees an opportunity to receive more or less shares than targeted depending on actual financial Performance. In addition, certain PSA awards include a modifier based on the three-year total shareholder return relative to a broad market index. Other awards include a hard-wired three-year total shareholder return metric relative to a broad market index. For RSUs, the grant date fair value of the awards, or the closing price per common share on the date of the award, is used to determine the amount of expense to be recognized over the applicable service period. For PSAs, the grant date fair value is estimated using a lattice model. The significant inputs include the stock price, volatility, dividend yield, and risk-free rate of return. Settlement of RSUs and PSAs will be made in shares of our common stock currently held in treasury. In 2023, 2022 and 2021, we issued awards to employees of RSUs and PSAs under our LTIP. RSUs vest based on the passage of time, generally over a graded three-year period or, in certain instances, cliff vest after one In addition, in 2022, we issued 360,000 PSAs and 240,000 RSUs to our new CEO, Thomas Fahnemann, as part of his on-boarding compensation package. These PSAs have a 3-year service and performance requirement that is based on our stock price achieving certain levels during the performance period. Specifically, if the Company’s closing stock price is $10 or higher for 20 consecutive days during the performance period, 50% of the award is achieved. If the stock price exceeds $18 per share for 20 consecutive days during the performance period 100% of the award is achieved. The RSUs vest over a three-year period with 50% vesting after two years and the remainder vesting after three years. In 2022, in connection with his separation from the Company, certain unvested RSUs and PSAs of the former CEO were forfeited, and as a result, the Company recognized a stock-based compensation benefit of approximately $3.1 million which is included in Selling, general and administrative expense on the accompanying consolidated statements of income (loss). In 2023, the Board continued to assess the executive leadership team and ultimately appointed Mr. Boris Illetschko as SVP, Chief Operating Officer who replaced Mr. Christopher Astley, SVP, Chief Commercial Officer and Mr. Wolfgang Laures, SVP Integrated Global Supply Chain & Information Technology. Upon hire, Mr. Illetschko received an equity award that followed the same design as the 2023 annual award, which consisted of 40% Time Based RSUs and 60% PSAs. Messrs. Astley and Laures forfeited any unvested equity upon their respective separation dates. For RSUs, the grant date fair value of the awards, or the closing price per common share on the date of the award, is used to determine the amount of expense to be recognized over the applicable service period. For PSAs, the grant date fair value is estimated using a lattice model. The significant inputs include the stock price, volatility, dividend yield, and risk-free rate of return. Settlement of RSUs and PSAs will be made in shares of our common stock currently held in treasury. The following table summarizes RSU and PSA activity during the past three years: Units 2023 2022 2021 Balance at January 1, 1,650,152 1,111,382 1,071,652 Granted 1,455,665 1,452,213 374,931 Forfeited (460,218) (582,457) (103,499) Shares delivered (371,660) (330,986) (231,702) Balance at December 31, 2,273,939 1,650,152 1,111,382 In thousands 2023 2022 2021 Compensation expense $ 2,797 $ 831 $ 5,063 The amount granted in 2023, 2022 and 2021 includes 758,222, 725,812 and 162,480 PSAs, respectively, exclusive of reinvested dividends. The weighted average grant date fair value per unit for awards in 2023, 2022 and 2021 was $3.69, $8.04 and $16.71, respectively. As of December 31, 2023, unrecognized compensation expense for outstanding RSUs and PSAs totaled $4.4 million. The weighted average remaining period over which the expense will be recognized is 1.79 years. Stock Only Stock Appreciation Rights The following table sets forth information related to outstanding SOSARs: 2023 2022 2021 SOSARs Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 769,544 $ 21.34 1,079,113 $ 20.42 1,082,413 $ 20.40 Granted — — — — — — Exercised — — — — (3,300) 15.61 Canceled / forfeited (238,025) 19.66 (309,569) 18.12 — — Outstanding at December 31, 531,519 $ 22.10 769,544 $ 21.34 1,079,113 $ 20.42 Exercisable at December 31, 531,519 22.10 769,544 21.34 1,079,113 20.42 Vested and expected to vest 531,519 22.10 769,544 21.34 1,079,113 20.42 Compensation expense (in thousands) $ — $ — $ — Under terms of the SOSAR, the recipients receive the right to receive a payment in the form of shares of common stock equal to the difference, if any, in the fair market value of one share of common stock at the time of exercising the SOSAR and the exercise price. No SOSARs were issued during any of the past three years. As of December 31, 2023, all issued SOSARs were vested and the intrinsic value of SOSARs was zero and the remaining weighted average contractual life of outstanding SOSARs was 1.26 years.

Retirement Plans and Other Post

Retirement Plans and Other Post-Retirement Benefits	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Retirement Plans and Other Post-Retirement Benefits	RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS Prior to May 2019, we provided non-contributory retirement benefits under both funded and unfunded plans to all U.S. employees and to certain non-U.S. employees in Germany. As discussed in more detail below, we terminated our U.S. qualified pension plan effective June 30, 2019 and replaced the benefits with an enhanced 401(k) defined contribution plan. Participation and benefits under the plans were based upon the employees’ date of hire. U.S. benefits accrued under the terminated pension plan was based on a final average pay formula or cash balance formula for salaried employees. In December 2019, our Board of Directors approved the freezing of benefit accruals in the non-qualified pension plan for active participants effective December 31, 2019. As of January 1, 2020, each active participant’s frozen non-qualified pension benefit was transferred to a newly approved Deferred Compensation Plan non-qualified benefit plan and will earn interest credits going forward. The Deferred Compensation Plan also provides for employer contributions and the Plan may provide for elective employee deferrals. Beginning in 2022, the plan allows active in-service withdrawals for elective employee deferrals. Under the Deferred Compensation Plan, participants are eligible to receive annual Company contributions that such participants would have received under our 401(k) Savings Plan, but for certain limitations imposed by the Internal Revenue Code on 401(k) plan contributions (“Company Contributions”). Unless otherwise determined by the Compensation Committee, Company Contributions under the Deferred Compensation Plan will not exceed 7% of a participant’s annual eligible compensation that is in excess of the Internal Revenue Code compensation limit for 401(k) plans. As of December 31, 2023 and 2022, the remaining non-contributory pension plans are unfunded non-qualified plans. Non-U.S. benefits were based on average salary and years of service. We use a December 31-measurement date for all of our defined benefit plans. We also provide certain health care benefits to eligible U.S.-based retired employees. Participation in the plan is closed to any salaried employees hired after December 31, 2006. For retirees prior to age 65, these benefits consists of either a Company provided fixed contribution, as determined on an annual basis, to the participant’s health reimbursement account or providing group medical insurance coverage with a subsidy cap of $10,000 per year, as determined by date of retirement. In December 2023, the Plan was amended to transition all retiree medical benefits to the health reimbursement construct, eliminating the group medical insurance offering. For certain retirees over age 65, these benefits consists of a fixed payment to defray the costs of Medicare. All information presented in the following tables represents amounts attributable to continuing operations. Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Change in Benefit Obligation Balance at beginning of year $ 34,729 $ 44,885 $ 3,380 $ 5,130 Service cost — — 11 15 Interest cost 1,417 1,054 178 131 Benefits paid (2,527) (2,065) (458) (529) One-time settlement (5,815) — — — Plan amendments — — 188 — Actuarial (gain)/loss 223 (8,436) (2) (1,367) Effect of currency rate changes 273 (709) — — Balance at end of year $ 28,300 $ 34,729 $ 3,297 $ 3,380 Change in Plan Assets Fair value of plan assets at beginning of year $ — $ — $ — $ — Reversion of excess plan assets — — — — Total contributions 2,527 2,065 511 529 Benefits paid (2,527) (2,065) (511) (529) Fair value of plan assets at end of year — — — — Funded status at end of year $ (28,300) $ (34,729) $ (3,297) $ (3,380) As of December 31, 2023, the non-qualified plans have an unfunded projected benefit obligation of $28.3 million. During 2023, we made a $5.8 million one-time settlement payment to our former CEO under the terms of his non-qualified pension plan in connection with his separation from the Company. In accordance with pension settlement accounting, we recorded a $0.6 million settlement charge Amounts recognized in the consolidated balance sheets consist of the following as of December 31: Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Current liabilities $ (2,337) $ (8,415) $ (552) $ (513) Other long-term liabilities (25,963) (26,314) (2,745) (2,886) Net amount recognized $ (28,300) $ (34,729) $ (3,297) $ (3,399) The components of amounts recognized as “Accumulated other comprehensive income” consist of the following on a pre-tax basis: Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Prior service credit (cost) $ (104) $ (127) $ (188) $ (21) Net actuarial gain (loss) (4,339) (4,762) 1,095 984 The weighted-average assumptions used in computing the benefit obligations above were as follows: Pension Benefits Other Benefits 2023 2022 2023 2022 Discount rate – benefit obligation 4.94 % 5.19 % 5.42 % 5.42 % The discount rates set forth above were estimated based on the modeling of expected cash flows for each of our benefit plans and selecting a portfolio of high-quality debt instruments with maturities matching the respective cash flows of each plan. The resulting discount rates as of December 31, 2023 ranged from 3.71% to 5.41% for pension plans and was 5.42% for the other benefit plans. Information for pension plans with an accumulated benefit obligation in excess of plan assets was as follows: In thousands 2023 2022 Projected benefit obligation $ 28,300 $ 34,729 Accumulated benefit obligation 28,300 34,729 Fair value of plan assets — — Net periodic benefit (income) expense includes the following components: Year ended December 31, In thousands 2023 2022 2021 Pension Benefits Interest cost $ 1,417 $ 1,054 $ 974 Amortization of prior service cost 23 43 48 Amortization of actuarial loss 81 653 790 One-time settlement charge 633 — — Total net periodic benefit expense $ 2,154 $ 1,750 $ 1,812 Other Benefits Service cost $ 11 $ 15 $ 29 Interest cost 178 131 127 Amortization of prior service credit 21 104 (233) Amortization of actuarial loss (gain) (51) — 47 Total net periodic benefit income $ 159 $ 250 $ (30) Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) were as follows: Year ended December 31, In thousands 2023 2022 Pension Benefits Actuarial (gains) loss $ 223 $ (8,436) Recognized prior service costs (23) (43) Recognized actuarial losses (715) (653) Total recognized in other comprehensive (income) loss (515) (9,132) Total recognized in net periodic benefit cost and other comprehensive loss $ 1,639 $ (7,382) Other Benefits Actuarial (gain) loss $ (2) $ (1,367) Amortization of actuarial loss 51 — Total recognized in other comprehensive loss 49 (1,367) Total recognized in net periodic benefit cost and other comprehensive loss $ 208 $ (1,117) The weighted-average assumptions used in computing the net periodic benefit expense information above were as follows: Year ended December 31, 2023 2022 2021 Pension Benefits Discount rate – benefit expense 5.19 % 2.42 % 2.17 % Other Benefits Discount rate – benefit expense 5.42 % 2.70 % 2.30 % Cash Flow Benefit payments expected to be made under our non-qualified pension plans and other benefit plans are summarized below: In thousands Pension Benefits Other Benefits 2024 $ 2,385 $ 567 2025 2,337 364 2026 2,282 321 2027 2,228 293 2028 2,158 285 2029 through 2033 10,489 1,199 Defined Contribution Plans We maintain 401(k) plans for substantially all U.S.-based employees. Employees may contribute up to 50% of their earnings, subject to certain restrictions. We currently provide a minimum company contribution equal to 7% of eligible compensation. In addition, we have provided discretionary contributions resulting in total contributions equal to 7.0%, 7.5% and 10% of compensation in 2023, 2022 and 2021, respectively. The expense associated with our 401(k) plan was $4.3 million, $2.7 million and $2.4 million in 2023, 2022 and 2021, respectively.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories, net of reserves were as follows: December 31, In thousands 2023 2022 Raw materials $ 82,012 $ 109,166 In-process and finished 150,220 142,331 Supplies 66,016 57,939 Total $ 298,248 $ 309,436

Plant, Equipment and Timberland

Plant, Equipment and Timberlands	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Plant, Equipment and Timberlands	PLANT, EQUIPMENT AND TIMBERLANDS Plant, equipment and timberlands at December 31 were as follows: In thousands 2023 2022 Land $ 24,145 $ 23,718 Building 233,048 228,310 Machinery, equipment & other 1,070,965 1,031,012 Accumulated depreciation (696,928) (645,404) 631,230 637,636 Construction in progress 31,686 38,175 Total $ 662,916 $ 675,811 As of December 31, 2023 and 2022, we had $4.6 million and $5.2 million, respectively, of accrued capital expenditures.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS The following table sets forth information with respect to goodwill and other intangible assets: In thousands Balance, Beginning 2022 Impairment Purchase price allocation adjustment Translation Balance, Purchase price allocation adjustment Translation Balance, End of 2023 Goodwill Airlaid Materials $ 109,486 $ — $ — $ (4,291) $ 105,195 $ — $ 2,496 $ 107,691 Composite Fibers 78,438 (76,411) — (2,027) — — — — Spunlace 48,241 (42,541) (500) (5,200) — — — — Total $ 236,165 $ (118,952) $ (500) $ (11,518) $ 105,195 $ — $ 2,496 $ 107,691 Other Intangible Assets Balance, Beginning 2022 Impairment Amortization Translation Balance, End of 2022 Amortization Translation Balance, End of 2023 Airlaid Materials Tradename $ 4,485 $ — $ — $ (1,043) $ 3,442 $ — $ 124 $ 3,566 Accumulated amortization (603) — (170) 34 (739) (174) (31) (944) Net 3,882 — (170) (1,009) 2,703 (174) 93 2,622 Technology and related 17,825 — — (313) 17,512 — 609 18,121 Accumulated amortization (4,552) — (1,131) 246 (5,437) (1,160) (222) (6,819) Net 13,273 — (1,131) (67) 12,075 (1,160) 387 11,302 Customer relationships and related 44,585 — (1,433) 43,152 — 834 43,986 Accumulated amortization (10,512) — (3,657) 598 (13,571) (3,706) (408) (17,685) Net 34,073 — (3,657) (835) 29,581 (3,706) 426 26,301 Composite Fibers Tradename - non-amortizing 3,601 (3,530) — (71) — — — — Technology and related 38,614 (37,823) — (791) — — — — Accumulated amortization (19,224) 19,380 (424) 268 — — — — Net 19,390 (18,443) (424) (523) — — — — Customer relationships and related 34,739 (34,046) — (693) — — — — Accumulated amortization (22,104) 22,351 (587) 340 — — — — Net 12,635 (11,695) (587) (353) — — — — Spunlace Products and Tradenames 27,623 — (333) 27,290 — 2,774 30,064 Accumulated amortization (253) — (1,241) (265) (1,759) (1,323) (370) (3,452) Net 27,370 — (1,241) (598) 25,531 (1,323) 2,404 26,612 Technology and related 14,547 — (175) 14,372 — 1,461 15,833 Accumulated amortization (202) — (1,151) (102) (1,455) (1,223) (468) (3,146) Net 14,345 — (1,151) (277) 12,917 (1,223) 993 12,687 Customer relationships and related 28,003 — (337) 27,666 — 2,812 30,478 Accumulated amortization (268) — (1,487) (48) (1,803) (1,580) (286) (3,669) Net 27,735 — (1,487) (385) 25,863 (1,580) 2,526 26,809 Total intangibles 214,022 (75,399) — (5,189) 133,434 — 8,614 142,048 Total accumulated amortization (57,718) 41,731 (9,848) 1,071 (24,764) (9,166) (1,785) (35,715) Net intangibles $ 156,304 $ (33,668) $ (9,848) $ (4,118) $ 108,670 $ (9,166) $ 6,829 $ 106,333 The following table sets forth information pertaining to amortization of intangible assets: In thousands 2023 2022 2021 Aggregate amortization expense: $ 9,166 $ 9,848 $ 9,753 Estimated amortization expense: 2024 9,408 2025 9,408 2026 9,408 2027 9,408 2028 9,408 Intangible assets are amortized on a straight-line basis. We amortize trade and product names over 15 years to 20 years; technical know-how over 8 years to 20 years; and customer relationships over 11 years to 18 years. The remaining weighted average useful life of intangible assets was 13.1 years at December 31, 2023.

Other Long-Term Assets

Other Long-Term Assets	12 Months Ended
	Dec. 31, 2023
Other Assets, Noncurrent [Abstract]
Other Long-Term Assets	OTHER LONG-TERM ASSETS Other long-term assets consist of the following: December 31, In thousands 2023 2022 Right-of-use asset operating leases $ 24,991 $ 25,420 Deferred taxes 18,590 9,321 Jacob Holm acquisition tax indemnification asset 17,229 17,229 Fox River escrow 9,009 8,777 Restricted cash - 401(K) 794 4,902 Other 10,276 12,544 Total $ 80,889 $ 78,193

Other Current Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	OTHER CURRENT LIABILITIES Other current liabilities consist of the following: December 31, In thousands 2023 2022 Accrued payroll and benefits $ 28,802 $ 32,863 Accrued tornado costs 29,000 — Income taxes payable 9,285 6,179 Accrued rebates 7,100 4,328 Operating lease liability 5,063 4,488 Accrued energy costs 4,409 3,844 Accrued interest 3,626 4,147 Other accrued expenses 25,473 32,875 Total $ 112,758 $ 88,724 At December 31, 2023, other current liabilities includes a $29 million estimated accrual for a contractual obligation to repair a leased production and warehouse facility. On December 9, 2023, a series of tornados in Tennessee damaged a portion of one of the Company’s leased Spunlace converting production and warehousing facilities. Under the terms of the lease arrangement, we are responsible for building repairs and are working with our insurers to facilitate rebuilding the site. As only a portion of the facility was damaged, production was able to resume in early 2024 in the undamaged areas within the facility. The costs of the repairs will be covered by the Company's insurance and an insurance recovery receivable of approximately $27 million is reflected in other current assets in the accompanying consolidated balance sheet as of December 31, 2023. Our insurance policy includes a $5 million deductible, which has been expensed in the fourth quarter and included in Cost of Product Sold in the accompanying statement of income (loss) for the year ended December 31, 2023.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	LEASES We enter into a variety of arrangements in which we are the lessee for the use of automobiles, forklifts and other production equipment, production facilities, warehouses and office space. We determine if an arrangement contains a lease at inception. All our lease arrangements are operating leases and are recorded in the consolidated balance sheet under the caption “Other assets” and the lease obligation is under “Other current liabilities” and “Other long-term liabilities.” We currently do not have any finance leases. Operating lease right of use (“ROU”) assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. ROU assets also include any initial direct costs incurred and any lease payments made at or before the lease commencement date, less lease incentives received. We use our incremental borrowing rate based on information available at the commencement date in determining the lease liabilities as our leases generally do not provide an implicit rate. Lease terms may include options to extend or terminate when we are reasonably certain that the option will be exercised. Lease expense is recognized on a straight-line basis over the lease term. We also have arrangements with both lease and non-lease components. We elected the practical expedients not to separate non-lease components from lease components for our real estate and automobile leases and the lack of need to reassess classification. We elected to apply the short-term lease measurement and recognition exemption in which ROU assets and lease liabilities are not recognized for arrangements less than twelve months in duration. The following table sets forth information related to our leases as of the periods indicated. December 31, Dollars in thousands 2023 2022 Right of use asset $ 24,991 $ 25,420 Weighted average discount rate 3.63 % 3.14 % Weighted average remaining maturity ( years ) 20 21 The following table sets forth operating lease expense for the periods indicated: December 31, In thousands 2023 2022 Operating lease expense $ 6,685 $ 5,867 The following table sets forth required minimum lease payments for the years indicated: In thousands 2024 $ 5,671 2025 4,693 2026 2,775 2027 2,295 2028 1,694 Thereafter 18,542

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Long-Term Debt	LONG-TERM DEBT Long-term debt is summarized as follows: December 31, In thousands 2023 2022 Revolving credit facility, due Sep. 2026 $ 99,450 $ 118,685 4.750% Senior Notes, due Oct. 2029 500,000 500,000 11.25% Term loan, due Mar 2029 271,215 — Term loan, due Feb 2024 — 193,588 2.05% Term Loan, due Mar 2023 — 1,423 1.30% Term Loan, due Jun 2023 — 762 1.55% Term Loan, due Sep 2025 — 3,594 1.10% Term Loan, due Mar 2024 1,005 4,848 0.57% Term Loan, due Jul 2023 — 21,332 Total long-term debt 871,670 844,232 Less current portion (1,005) (40,435) Unamortized deferred issuance costs (17,502) (10,545) Long-term debt, net of current portion $ 853,163 $ 793,252 On September 2, 2021, we entered into a restatement agreement as part of a Fourth Amended and Restated $400.0 million Revolving Credit Facility and a €220.0 million Term Loan (collectively, the “Credit Facility ”) which matures September 6, 2026 and February 8, 2024, respectively. Revolving Loans borrowings are available in U.S. Dollars, Euros, British Pound Sterling, and Canadian Dollars and the borrowing of Term Loans are available in Euros. The principal amount of the Term Loan amortizes in consecutive quarterly installments of principal, with each such quarterly installment to be in an amount equal to 1.25% of the Term Loan funded. On May 9, 2022, we entered into an amendment to the Credit Agreement, which was further amended on March 30, 2023. The March 30, 2023 amendment to the Credit Agreement reduced the Revolving Credit Facility to $250.0 million and had us fully extinguish the €220.0 million Term Loan. The amendment: i) modifies the “leverage ratio” to be the ratio of consolidated senior secured debt to consolidated adjusted EBITDA ; ii) increases the maximum interest rate borrowing margin to be applied to the applicable index by 275 basis points; and iii) pledges as collateral substantially all domestic and Canadian assets to secure obligations owed under the Credit Agreement, as well as, on a second lien basis, the European assets that secure the AG Loan (as defined below). As amended, we are obligated to maintain a leverage ratio under 4.25 to 1.0 through the quarter ended December 31, 2024, stepping down to 4.0 to 1.0 at March 31, 2025, and 3.50 to 1.0 at March 31, 2026. Borrowing rates for the Revolving Loans are determined at our option at the time of each borrowing. For all U.S. Dollar denominated Revolving Loan borrowings, the borrowing rate is either, (a) the bank’s base rate which is equal to the greater of i) the prime rate; ii) the overnight bank funding rate plus 50 basis points; or iii) the daily Simple Secured Overnight Financing Rate (“SOFR”) rate plus 100 basis points plus an applicable spread over either i), ii) or iii) ranging from 250 basis points to 400 basis points based on the Company’s leverage ratio; or (b) the daily Term SOFR-rate plus an applicable margin ranging from 350 basis points to 500 basis points based on the Company’s leverage ratio. For non-U.S. Dollar denominated borrowings, interest is based on the Euro-rate or EURIBOR-rate plus an applicable margin ranging from 350 basis points to 500 basis points based on the Company’s leverage ratio. The Credit Agreement contains a number of customary covenants for financings of this type that, among other things, restrict our ability to dispose of or create liens on assets, incur additional indebtedness, limits certain intercompany financing arrangements, make acquisitions and engage in mergers or consolidations. The Credit Agreement also contains covenants requiring a minimum debt coverage ratio. All remaining principal outstanding and accrued interest under the Revolving Credit Facility will be due and payable on September 2, 2026. As of December 31, 2023, the leverage ratio and the debt service ratio, as calculated in accordance with the definition in our Credit Agreement, was 3.4x and 1.7, respectively. A breach of these requirements would give rise to certain remedies under the Revolving Credit Facility, among which is the termination of the agreement. On March 30, 2023, we entered into a €250.0 million Term Loan with certain affiliates of Angelo, Gordon & Co., L.P. (“AG Loan”). The net proceeds from the AG Loan were used to extinguish the €220.0 million Term Loan, to repay a portion of outstanding revolving borrowings under the Revolving Credit Facility, for working capital and general corporate purposes and to pay estimated fees and expenses. The AG Loan will mature on March 23, 2029. Interest on the AG Loan accrues at the rate of 11.25% per annum and is payable quarterly in arrears on March 31, June 30, September 30, and December 31 each year, commencing on June 30, 2023. The AG Loan is prepayable, in whole or in part, at any time at the prepayable premium specified in the Term Loan Agreement. Prior to September 30, 2024, we may prepay some or all of the AG Loan at a "make-whole" premium as specified. Under the terms of the AG Loan, we have pledged as collateral substantially all assets of our subsidiaries in Germany, Luxembourg, United Kingdom, Malta and Switzerland, as well as, on a second lien basis, the domestic and Canadian assets that secure the Revolving Credit Facility. All covenants contained in the AG Loan agreement are substantially consistent with the Credit Agreement. On October 25, 2021, we issued $500.0 million aggregate principal amount of 4.750% senior notes due 2029 (the “Notes”). The Notes are guaranteed on a senior unsecured basis, jointly and severally, by each of our existing and future domestic restricted subsidiaries that guarantees our obligations under the Credit Agreement, and/or certain other indebtedness (the “Guarantees”). The Notes were issued pursuant to an indenture dated as of October 25, 2021 (the “Base Indenture”), as supplemented by the supplemental indenture dated as of October 25, 2021 (the “Supplemental Indenture” and, together with the Base Indenture, the “Indenture”) among the Company, certain subsidiaries of the Company party thereto (the “Guarantors”) and Wilmington Trust, National Association, as trustee. The net proceeds from the offering of the Notes, together with cash on hand, were used to pay the purchase price of the Jacob Holm acquisition, to repay certain indebtedness of Jacob Holm, to repay outstanding revolving borrowings under the Revolving Credit Facility, and to pay estimated fees and expenses. The Notes will mature on November 15, 2029. Interest on the Notes accrues at the rate of 4.750% per annum and is payable semi-annually in arrears on May 15 and November 15 of each year, commencing on May 15, 2022. The Notes are redeemable, in whole or in part, at any time at the redemption prices specified in the underlying indenture. Prior to November 15, 2024, we may redeem some or all of the Notes at a "make-whole" premium as specified. The Notes contain various covenants customary to indebtedness of this nature, including limitations on i) the amount of indebtedness that may be incurred; ii) certain restricted payments including common stock dividends; iii) distributions from certain subsidiaries; iv) sales of assets; v) transactions amongst subsidiaries; and vi) incurrence of liens on assets. In addition, the Notes contain cross default provisions that could result in all such notes becoming due and payable in the event of a failure to repay debt outstanding under the Credit Agreement at maturity or a default under the Credit Agreement that accelerates the debt outstanding thereunder. As of December 31, 2023, we met all of the requirements of our debt covenants. Glatfelter Gernsbach GmbH (“Gernsbach”), a wholly-owned subsidiary of ours, entered into a series of borrowing agreements with IKB Deutsche Industriebank AG, Düsseldorf (“IKB”). Each of the borrowings require quarterly repayments of principal and interest and provide for representations, warranties and covenants customary for financings of these types. The financial covenants contained in each of the IKB loans are calculated by reference to our Credit Agreement. These borrowings were fully extinguished on March 14, 2023. In 2021, Gernsbach also entered into two fixed-rate non-amortizing term loans with certain financial institutions. Similar to the IKB loans discussed above, the financial covenants of these borrowings are calculated by reference to the Credit Agreement. On February 28, 2023, one of these term loans for €20.0 million was fully extinguished. The remaining term loan has a principal balance of $1.0 million and matures in March 2024. Aggregated unamortized deferred debt issuance costs incurred in connection with all of our outstanding debt totaled $17.5 million at December 31, 2023. The deferred costs are being amortized on a straight-line basis over the life of the underlying instruments. Amortization expense related to deferred debt issuance costs totaled $3.0 million, $1.9 million and $0.9 million in 2023, 2022 and 2021, respectively. The following schedule sets forth the amortization of our term loan agreements together with the maturity of our other long-term debt during the indicated year. In thousands 2024 $ 1,005 2025 — 2026 99,450 2027 — 2028 — Thereafter 776,250 Glatfelter Corporation guarantees all debt obligations of its subsidiaries. All such obligations are recorded in these consolidated financial statements. As of December 31, 2023 and 2022, we had $5.7 million and $4.7 million, respectively, of letters of credit issued to us by certain financial institutions. The letters of credit, which reduce amounts available under our Revolving Credit Facility, provide financial assurances for the performance of long-term monitoring activities associated with the Fox River environmental matter and for the benefit of certain state workers compensation insurance agencies in conjunction with our self-insurance program. We bear the credit risk on this amount to the extent that we do not comply with the provisions of certain agreements. No amounts are outstanding under the letters of credit.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS The amounts reported on the consolidated balance sheets for cash and cash equivalents, accounts receivable and short-term debt approximate fair value. The following table sets forth the carrying value and fair value of long-term debt as of December 31: 2023 2022 In thousands Carrying Fair Carrying Fair Revolving credit facility, due Sep. 2026 $ 99,450 $ 99,450 $ 118,685 $ 118,685 4.750% Senior Notes, due Oct. 2029 500,000 346,250 500,000 301,250 11.25% Term loan, due Mar 2029 271,215 282,586 — 188,998 Term loan, due Feb 2024 — — 193,588 — 2.05% Term Loan, due Mar 2023 — — 1,423 1,418 1.30% Term Loan, due Jun 2023 — — 762 754 1.55% Term Loan, due Sep 2025 — — 3,594 3,430 1.10% Term Loan, due Mar 2024 1,005 993 4,848 4,721 0.57% Term Loan, due Jul 2023 — — 21,332 20,932 Total long-term debt $ 871,670 $ 729,279 $ 844,232 $ 640,188 The values set forth above are based on observable inputs and other relevant market data (Level 2). The fair value of financial derivatives is set forth below in Note 22 – “ Financial Derivatives and Hedging Activities. ”

Financial Derivatives and Hedgi

Financial Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivatives and Hedging Activities	FINANCIAL DERIVATIVES AND HEDGING ACTIVITIES As part of our overall risk management practices, we enter into financial derivatives primarily designed to either i) hedge foreign currency risks associated with forecasted transactions – “cash flow hedges”; ii) mitigate the impact that changes in currency exchange rates have on intercompany financing transactions and foreign currency denominated receivables and payables – “foreign currency hedges”; or iii) convert variable interest rate debt to fixed rates. Derivatives Designated as Hedging Instruments - Cash Flow Hedges We use currency forward contracts as cash flow hedges to manage our exposure to fluctuations in the currency exchange rates on certain forecasted production costs. Currency forward contracts involve fixing the exchange for delivery of a specified amount of foreign currency on a specified date. As of December 31, 2023, the maturity of currency forward contracts ranged from one month to 15 months. We designate certain currency forward contracts as cash flow hedges of forecasted raw material purchases, certain production costs or capital expenditures with exposure to changes in foreign currency exchange rates. Changes in the fair value of derivatives designated and that qualify as cash flow hedges of foreign exchange risk is deferred as a component of accumulated other comprehensive income in the accompanying condensed consolidated balance sheets. With respect to hedges of forecasted raw material purchases or production costs, the amount deferred is subsequently reclassified into costs of products sold in the period that, inventory produced using the hedged transaction, affects earnings. For hedged capital expenditures, deferred gains or losses are reclassified and included in the historical cost of the capital asset and subsequently affect earnings as depreciation is recognized. We had the following outstanding derivatives that were used to hedge foreign exchange risks associated with forecasted transactions and designated as hedging instruments: December 31, In thousands 2023 2022 Derivative Sell/Buy - sell notional Euro / British Pound 15,210 18,961 Philippine Peso / Euro 137,449 — U.S. Dollar / British Pound 18,470 34,501 U.S. Dollar / Euro 277 824 Sell/Buy - buy notional Euro / Philippine Peso 788,342 1,030,114 British Pound / Philippine Peso 923,653 1,144,839 Euro / U.S. Dollar 93,397 78,435 U.S. Dollar / Canadian Dollar 30,914 36,423 British Pound / U.S. Dollar 2,211 — On June 15, 2022, we terminated a €180 million notional value floating-to-fixed interest rate swap agreement with certain financial institutions that was entered into in October 2019 and was to mature in December 2022. During the life of the swap, we paid a fixed interest rate of the applicable margin plus 0.0395% on €180 million of the underlying variable rate term loan. We received the greater of 0.00% or EURIBOR. At termination, we recognized a deferred gain of $0.4 million that was amortized into interest expense through December 2022. Derivatives Designated as Hedging Instruments – Net Investment Hedge The €220 million Term Loan discussed in Note 20 – “ Long-Term Debt” is designated as a net investment hedge of our Euro functional currency foreign subsidiaries. During 2023, we recognized a pre-tax loss of $3.7 million and in 2022 a pre-tax gain of $10.8 million on the remeasurement of the term loan from changes in currency exchange rates. Such amounts are recorded as a component of Other Comprehensive Income (Loss). On September 6, 2022, we terminated a $150.0 million cross currency swap agreement with certain financial institutions that was entered into in March 2022 and was to mature in May 2025. Pursuant to the terms of the swap, we had agreed to receive 4.750% interest denominated in U.S. dollars and we agreed to pay 3.06% interest denominated in euros. We designated the cross-currency swap as a hedge of our net investment in certain euro functional currency subsidiaries. We collected cash proceeds of approximately $15.2 million upon termination. The gain associated with the swap remains in accumulated other comprehensive loss. Derivatives Not Designated as Hedging Instruments - Foreign Currency Hedges We also enter into forward foreign exchange contracts to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities. None of these contracts are designated as hedges for financial accounting purposes and, accordingly, changes in value of the foreign exchange forward contracts and in the offsetting underlying on-balance-sheet transactions are reflected in the accompanying consolidated statements of income (loss) under the caption “Other, net.” The following sets forth derivatives used to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities: December 31, In thousands 2023 2022 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 22,800 28,600 British Pound / Euro 3,500 2,800 U.S. Dollar / Swiss Franc 13,620 — British Pound / Swiss Franc 2,240 2,535 Euro / Swiss Franc 4,940 — Euro / U.S. Dollar 11,000 9,630 U.S Dollar / Philipine Peso 6,700 — Sell/Buy - buy notional Euro / U.S. Dollar 10,200 2,900 British Pound / Euro 6,470 15,950 Swiss Franc / Euro — 2,250 Swiss Franc / U.S. Dollar — 930 Chinese Yuan / U.S. Dollar — 4,400 U.S. Dollar / Canadian Dollar 1,120 — These contracts have maturities of one month from the date originally entered into. Fair Value Measurements The following table summarizes the fair values of derivative instruments as of December 31 for the year indicated and the line items in the accompanying consolidated balance sheets where the instruments are recorded: December 31, December 31, In thousands 2023 2022 2023 2022 Balance sheet caption Prepaid Expenses Other Current Designated as hedging: Forward foreign currency exchange contracts $ 851 $ 1,795 $ 1,653 $ 2,368 Interest rate swap — — — — Not designated as hedging: Forward foreign currency exchange contracts 937 797 155 317 The amounts set forth in the table above represent the net asset or liability giving effect to rights of offset with each counterparty. The following table summarizes the amount of income or loss from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying consolidated statements of income (loss) where the results are recorded: Year ended December 31, In thousands 2023 2022 2021 Designated as hedging: Forward foreign currency exchange contracts: Cost of products sold $ (1,785) $ (7,896) $ (382) Interest expense — (335) 85 Not designated as hedging: Forward foreign currency exchange contracts: Other – net (1,378) 1,240 2,666 The impact of activity not designated as hedging was substantially all offset by the remeasurement of the underlying on-balance sheet item. The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described in Note 2 – “ Accounting Policies .” The fair values of the foreign exchange forward contracts are considered to be Level 2. These contracts are valued using foreign currency forward and interest rate curves. The fair value of each contract is determined by comparing the contract rate to the forward rate and discounting to present value. Contracts in a gain position are recorded in the accompanying consolidated balance sheets under the caption “Prepaid expenses and other current assets” and the value of contracts in a loss position is recorded under the caption “Other current liabilities.” A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income is as follows: In thousands 2023 2022 Balance at January 1, $ 242 $ 2,889 Deferred gains on cash flow hedges 735 5,584 Reclassified to earnings (1,785) (8,231) Balance at December 31, $ (808) $ 242 We expect substantially all of the amounts recorded as a component of accumulated other comprehensive income will be realized in results of operations within the next twelve Credit risk related to derivative activity arises in the event a counterparty fails to meet its obligations to us. This exposure is generally limited to the amounts, if any, by which the counterparty’s obligations exceed our obligation to them. Our policy is to enter into contracts only with financial institutions which meet certain minimum credit ratings.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY The following table summarizes outstanding shares of common stock: Year ended December 31, In thousands 2023 2022 2021 Shares outstanding at beginning of year 44,794 44,549 44,368 Treasury shares issued for: Restricted stock awards and performance share awards 293 245 181 Shares outstanding at end of year 45,087 44,794 44,549

Commitments, Contingencies and

Commitments, Contingencies and Legal Proceedings	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Legal Proceedings	COMMITMENTS, CONTINGENCIES AND LEGAL PROCEEDINGS Contractual Commitments The following table summarizes the minimum annual payments due on noncancellable operating leases and other similar contractual obligations having initial or remaining terms in excess of one year: In thousands Leases Other 2024 $ 5,671 $ 14,446 2025 4,693 — 2026 2,775 — 2027 2,295 — 2028 1,694 — Thereafter 18,542 — Other contractual obligations primarily represent unconditional purchase obligations under energy supply contracts. At December 31, 2023, required minimum annual payments due under operating leases and other similar contractual obligations aggregated $35.7 million and $14.4 million, respectively. Fox River - Neenah, Wisconsin Background We have previously reported that we face liabilities associated with environmental claims arising out of the presence of polychlorinated biphenyls (“PCBs”) in sediments in the lower Fox River, on which our former Neenah facility was located, and in the Bay of Green Bay, Wisconsin (collectively, the “Site”). Since the early 1990s, the United States, the State of Wisconsin and two Indian tribes (collectively, the “Governments”) have pursued a cleanup of a 39-mile stretch of river from Little Lake Butte des Morts into Green Bay and natural resource damages (“NRDs”). The United States originally notified several entities that they were potentially responsible parties (“PRPs”); however, after giving effect to settlements reached with the Governments, the remaining PRPs exposed to continuing obligations to implement the remainder of the cleanup consist of us, Georgia-Pacific Consumer Products, L.P. (“Georgia-Pacific”) and NCR Corporation. The United States Environmental Protection Agency (“EPA”) has divided the Site into five “operable units,” including the most upstream portion of the Site on which our facility was located (“OU1”) and four downstream reaches of the river and bay (“OU2-5”). Over the past several years, we and certain other PRPs completed all remedial actions pursuant to applicable consent decrees or a Unilateral Administrative Order. In January 2019, we reached an agreement with the United States, the State of Wisconsin, and Georgia-Pacific to resolve all remaining claims among those parties. Under the Glatfelter consent decree, we are primarily responsible for long-term monitoring and maintenance in OU2-OU4a and for reimbursement of government oversight costs paid after October 2018. Finally, we remain responsible for our obligation to continue long-term monitoring and maintenance under our OU1 consent decree. Cost estimates Our remaining obligations under the OU1 consent decree consist of long-term monitoring and maintenance. Furthermore, we are primarily responsible for long-term monitoring and maintenance in OU2-OU4a over a period of at least 30 years. The monitoring activities consist of, among others, testing fish tissue, sampling water quality and sediment, and inspections of the engineered caps. In 2018, we entered into a fixed-price, 30-year agreement with a third party for the performance of all of our monitoring and maintenance obligations in OU1 through OU4a with limited exceptions, such as, for extraordinary amounts of cap maintenance or replacement. Our obligation under this agreement is included in our total reserve for the Site. We are obligated to make the regular payments under that fixed-price contract until the remaining amount due is less than the OU1 escrow account balance. We are permitted to pay for this contract using the remaining balance of the escrow account established by us and WTM I Company (“WTM I”) another PRP, under the OU1 consent decree during any period that the balance in the escrow account exceeds the amount due under our fixed-price contract. As of December 31, 2023, the escrow account balance, which is included in the consolidated balance sheet under the caption “Other assets” totaled $9.0 million which is less than amounts due under the fixed-price contract by approximately $0.9 million. Our obligation to pay this difference is secured by a letter of credit. Under the consent decree, we are responsible for reimbursement of government oversight costs paid from October 2018 and later over approximately the next 30 years. Reserves for the Site Our reserve for past and future government oversight costs and long-term monitoring is set forth below: Year ended December 31, In thousands 2023 2022 Balance at January 1, $ 14,547 $ 16,200 Payments (1,049) (1,848) Accretion 199 195 Balance at December 31, $ 13,697 $ 14,547 The payments set forth above represent payments for government oversight costs for amounts due under the long-term monitoring and maintenance agreement. Of our total reserve for the Fox River, $2.0 million is recorded in the accompanying December 31, 2023, consolidated balance sheet under the caption “Environmental liabilities” and the remaining $11.7 million is recorded under the caption “Other long-term liabilities.” Range of Reasonably Possible Outcomes . Based on our analysis of all available information, including but not limited to decisions of the courts, official documents such as records of decision, discussions with legal counsel, cost estimates for future monitoring and maintenance and other post-remediation costs to be performed at the Site, we do not believe that our costs associated with the Fox River matter could exceed the aggregate amounts accrued by a material amount. On February 9, 2024, the Wisconsin Department of Natural Resources (“WDNR”) confirmed final completion of remediation activities for OU1 and OU2-5 of the lower Fox River and Bay of Green Bay. However, as indicated above, we are still responsible for continuing obligations to include government oversight costs and long-term monitoring.

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment and Geographic Information	SEGMENT AND GEOGRAPHIC INFORMATION The following table sets forth net sales, profitability and other information by segment: Year ended December 31, In thousands, except per share 2023 2022 2021 Net Sales Airlaid Material $ 586,480 $ 601,514 $ 470,250 Composite Fibers 483,517 523,863 556,807 Spunlace 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694 Operating income (loss) Airlaid Material $ 43,207 $ 54,809 $ 42,244 Composite Fibers 21,347 16,923 37,422 Spunlace (2,068) (9,289) (1,338) Other and unallocated (59,774) (226,394) (49,714) Total $ 2,712 $ (163,951) $ 28,614 Depreciation and amortization Airlaid Material $ 30,464 $ 30,114 $ 28,101 Composite Fibers 15,665 19,632 27,690 Spunlace 13,245 11,850 1,693 Other and unallocated 3,873 5,128 3,937 Total $ 63,247 $ 66,724 $ 61,421 Capital expenditures Airlaid Material $ 9,885 $ 9,691 $ 8,431 Composite Fibers 12,286 15,730 11,912 Spunlace 9,047 6,689 3,810 Other and unallocated 2,552 5,630 5,884 Total $ 33,770 $ 37,740 $ 30,037 Tons shipped (metric) Airlaid Material 156,442 164,844 148,134 Composite Fibers 94,742 103,092 132,196 Spunlace 61,618 72,725 12,514 Inter-segment sales elimination (1,258) — — Total 311,544 340,661 292,844 Plant, equipment and timberlands, net Airlaid Material $ 335,456 $ 347,142 $ 371,324 Composite Fibers 146,022 145,959 202,445 Spunlace 160,294 159,648 161,478 Other and unallocated 21,144 23,062 23,565 Total $ 662,916 $ 675,811 $ 758,812 Results of individual operating segments are presented based on our management accounting practices and management structure. There is no comprehensive, authoritative body of guidance for management accounting equivalent to accounting principles generally accepted in the United States of America; therefore, the financial results of individual segments are not necessarily comparable with similar information for any other company. The management accounting process uses assumptions and allocations to measure performance of the operating segments. Methodologies are refined from time to time as management accounting practices are enhanced and businesses change. The costs incurred by support areas not directly aligned with the operating segments are allocated primarily based on an estimated utilization of support area services. Management evaluates results of operations of the operating segments before pension expense, certain corporate level costs, and the effects of certain gains or losses not considered to be related to the core business operations. Management believes that this is a more meaningful representation of the operating performance of its core businesses, the profitability of segments and the extent of cash flow generated from these core operations. Such amounts are presented under the caption “Other and Unallocated.” In the evaluation of operating segment results, management does not use any measures of total assets. This presentation is aligned with the management and operating structure of our company. It is also on this basis that the Company’s performance is evaluated internally and by the Company’s Board of Directors. Our Airlaid Materials segment is a leading global supplier of highly absorbent cellulose-based airlaid nonwoven materials used in the following categories: • Feminine hygiene and other hygiene applications; • Specialty wipes; • Tabletop; • Adult incontinence; • Home care; • Food pads; and • Other consumer and industrial products. The Composite Fibers segment serves customers globally and focuses on higher value-added products in the following categories: • Food & beverage; • Technical specialties; • Wallcovering; • Composite laminates; and • Metallized products. The Spunlace segment is a global leading specialist manufacturer of premium quality spunlace nonwovens for critical cleaning, high-performance materials, personal care, hygiene and medical applications. The categories served by Spunlace include: • Consumer wipes; • Critical cleaning; • Health care; • Hygiene; • High performance; and • Beauty care. Disaggregated net sales by categories and geographic region for the segments is presented in Item 8 Financial Statements and Supplementary Data, Note 8 – “ Revenue .” In 2023, 2022 and 2021, approximately 16%, 15% and 16%, respectively, of our consolidated net sales were from sales to Procter & Gamble Company, a customer in the Airlaid Materials and Spunlace segments. Our net sales to external customers and location of net plant, equipment and timberlands are summarized below. Net sales are attributed to countries based upon origin of shipment. 2023 2022 2021 In thousands Net sales Plant, Equipment and Timberlands – Net Net sales Plant, Equipment and Timberlands – Net Net sales Plant, Equipment and Timberlands – Net United States $ 497,370 $ 304,895 $ 508,679 $ 317,191 $ 255,086 $ 326,668 Germany 531,241 197,267 537,363 194,586 513,043 251,375 United Kingdom 79,640 42,198 74,487 43,015 82,144 50,420 Canada 133,793 57,408 146,393 61,516 120,808 65,291 Other 143,472 61,148 224,404 59,503 113,613 65,057 Total $ 1,385,516 $ 662,916 $ 1,491,326 $ 675,811 $ 1,084,694 $ 758,812

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENT On February 6, 2024, we entered into certain definitive agreements with Berry Global Group, Inc. (“Berry”) for Berry to spin-off and merge the majority of its Health, Hygiene and Specialties segment including its Global Nonwovens and Films business (“HHNF”) with Glatfelter (the “Merger”). The board of directors of both Berry and Glatfelter have unanimously approved the Merger. The Merger is expected to occur through a series of transactions, including a Reverse Morris Trust transaction such that HHNF will become a wholly owned subsidiary of Glatfelter. Upon completion of the Merger, Berry shareholders will hold 90% of the outstanding shares of Glatfelter and Glatfelter shareholders will continue to hold 10% of the outstanding shares of Glatfelter. The combined company’s Board of Directors will include 6 members chosen by Berry and 3 chosen from Glatfelter’s existing Board of Directors, with Curt Begle, the current president of the Health, Hygiene & Specialties Division of Berry becoming the Chief Executive Officer. The transaction is expected to close in the second half of 2024, subject to Glatfelter shareholder approval and customary closing conditions and regulatory approvals. Prior to the completion of the Merger, Glatfelter and HHNF will continue to operate as independent companies. On February 6, 2024, our Board of Directors, following approval by the Compensation Committee, approved a cash retention program with respect to the Merger for our executive officers and other key employees. The total amount of cash retention bonuses to be paid is $6.0 million, half of which will be paid at closing of the Merger and the remainder six months after close.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	GLATFELTER CORPORATION AND SUBSIDIARIES SUPPLEMENTAL FINANCIAL STATEMENT SCHEDULE For each of the three years ended December 31, 2023 Valuation and Qualifying Accounts Allowance for In thousands Doubtful Accounts Sales Discounts and Deductions 2023 2022 2021 2023 2022 2021 Balance, beginning of year $ 5,025 $ 2,731 $ 2,093 $ 1,914 $ 825 $ 791 Provision 132 3,044 469 5,633 3,077 1,649 Write-offs, recoveries and discounts allowed (2,703) (102) (10) (5,852) (1,610) (1,493) Other (1) 184 (648) 179 77 (377) (122) Balance, end of year $ 2,638 $ 5,025 $ 2,731 $ 1,772 $ 1,914 $ 825 The provision for doubtful accounts is included in selling, general and administrative expense and the provision for sales discounts and deductions is deducted from sales. The related allowances are deducted from accounts receivable. (1) Relates primarily to changes in currency exchange rates.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income (loss)	$ (79,053)	$ (194,208)	$ 6,937

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Glatfelter and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated.
Reclassification of Prior Year Presentation	Reclassification of Prior Year Presentation Certain prior year amounts in the footnotes to the consolidated financial statements have been reclassified to conform to the current year presentation.
Accounting Estimates	Accounting Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies as of the balance sheet date and the reported amounts of net sales and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes that actual results may differ from those estimates and assumptions.
Discontinued Operations	Discontinued Operations
Cash and Cash Equivalents	Cash and Cash Equivalents We classify all highly liquid instruments with an original maturity of three months or less at the time of purchase as cash equivalents.
Inventories	Inventories
Plant, Equipment and Timberlands	Plant, Equipment and Timberlands For financial reporting purposes, depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows: Buildings 15 – 45 years Machinery and equipment 5 – 40 years Other 3 – 25 years
Maintenance and Repairs	Maintenance and Repairs Maintenance and repairs costs are charged to income and major renewals and improvements are capitalized. At the time property is retired or sold, the net carrying value is eliminated and any resultant gain or loss is included in income.
Valuation of Long-lived Assets, Intangible Assets and Goodwill	Valuation of Long-lived Assets, Intangible Assets and Goodwill We evaluate long-lived assets for impairment when a specific event indicates that the carrying value of an asset may not be recoverable. Recoverability is assessed based on estimates of future cash flows expected to result from the use and eventual disposition of the asset. If the sum of expected undiscounted cash flows is less than the carrying value of the asset, the asset’s fair value is estimated, and an impairment loss is recognized for the amount by which the carrying value exceeds the estimated fair value. Goodwill and indefinite-lived intangible assets are not amortized and, therefore, are reviewed for impairment annually, during the fourth quarter, or more frequently if impairment indicators are present.
Income Taxes	Income Taxes Income taxes are determined using the asset and liability method of accounting for income taxes in accordance with FASB ASC 740 Income Taxes (“ASC 740”). Under ASC 740, tax expense includes U.S. and international income taxes plus the provision for U.S. taxes on undistributed earnings of international subsidiaries not deemed to be permanently invested. Tax credits and other incentives reduce tax expense in the year the credits are claimed. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported in deferred income taxes. Deferred tax assets are recognized if it is more likely than not that the assets will be realized in future years. We establish a valuation allowance for deferred tax assets for which realization is not more likely than not. Significant judgment is required in determining our worldwide provision for income taxes and recording the related assets and liabilities. In the ordinary course of our business, there are many transactions and calculations where the ultimate tax determination is less than certain. We and our subsidiaries are examined by various Federal, State, and foreign tax authorities. We regularly assess the potential outcomes of these examinations and any future examinations for the current or prior years in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and record any necessary adjustments in the period in which the facts that give rise to a revision become known. Investment tax credits are accounted for by the flow-through method, which results in recognition of the benefit in the year in which the credit become available. We account for global intangible low-taxed income (“GILTI”) tax in the period in which it is incurred. The GILTI provisions require entities to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiaries’ tangible assets.
Treasury Stock	Treasury Stock Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the weighted-average cost basis.
Foreign Currency Translation	Foreign Currency Translation Foreign currency translation gains and losses and the effect of exchange rate changes on transactions designated as hedges of net foreign investments are included as a component of other comprehensive income (loss). Transaction gains and losses are included in income in the period in which they occur.
Revenue Recognition	Revenue Recognition We recognize revenue, or net sales, in accordance with ASU No. 2014-09, Revenue from Contracts with Customers. Our revenue is earned primarily from the manufacture and sale of engineered materials (“product sales”). Revenue is earned pursuant to contracts, supply agreements and other arrangements with a wide variety of customers. Our performance obligation is to produce a specified product according to technical specifications and, in substantially all instances, to deliver the product. Revenue from product sales is earned at a point in time. We recognize revenue on product sales when we have satisfied our performance obligation and control of the product has passed to the customer thereby entitling us to payment. With respect to substantially all arrangements for product sales, this is deemed to occur when title transfers in accordance with specified shipping terms.
Environmental Liabilities	Environmental Liabilities Accruals for losses associated with environmental obligations are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated based on existing legislation and remediation technologies. These accruals are adjusted periodically as assessment and remediation actions continue and/or further legal or technical information develops. Such liabilities are exclusive of any insurance or other claims against third parties. Environmental costs are capitalized if the costs extend the life of the asset, increase its capacity and/or mitigate or prevent contamination from future operations. Recoveries of environmental remediation costs from other parties, including insurance carriers, are recorded as assets when their receipt is assured beyond a reasonable doubt.
Earnings Per Share	Earnings Per Share Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted-average common shares outstanding during the respective periods. Diluted earnings per share is computed by dividing net income by the weighted-average common shares and common share equivalents outstanding during the period. In periods in which there is a net loss, diluted loss per share is equal to basic loss per share. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method.
Financial Derivatives and Hedging Activities	Financial Derivatives and Hedging Activities We use financial derivatives to manage exposure to changes in foreign currencies and interest rates. In accordance with FASB ASC 815 Derivatives and Hedging (“ASC 815”), we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Under the accounting for fair value measurements and disclosures, a fair value hierarchy was established that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are described below: Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 - Inputs that are both significant to the fair value measurement and unobservable.
Employee Retention Tax Credit	Employee Retention Tax Credit
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). The standard improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual reporting periods beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The guidance is to be applied retrospectively to all prior periods presented in the financial statements. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). The standard enhances income tax disclosure requirements by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and provides clarification on uncertain tax positions and related financial statement impacts. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. We are currently evaluating the potential impact of adopting this new guidance on our consolidated financial statements and related disclosures.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Plant, Equipment and Timberlands	The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows: Buildings 15 – 45 years Machinery and equipment 5 – 40 years Other 3 – 25 years Plant, equipment and timberlands at December 31 were as follows: In thousands 2023 2022 Land $ 24,145 $ 23,718 Building 233,048 228,310 Machinery, equipment & other 1,070,965 1,031,012 Accumulated depreciation (696,928) (645,404) 631,230 637,636 Construction in progress 31,686 38,175 Total $ 662,916 $ 675,811

Sale of Ober-schmitten, Germa_2

Sale of Ober-schmitten, Germany Facility (Tables)	12 Months Ended
	Dec. 31, 2023
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Loss on Sale	The loss on sale is recapped as follows: In thousands Cash $ 5,793 Accounts receivable 2,950 Inventory 5,039 Prepaids and other current assets 8,847 Property, plant and equipment 2,513 Accounts payable and accrued liabilities (7,337) Loss on sale $ 17,805 During 2023, 2022 and 2021, we completed the following sales of assets: Dollars in thousands Acres Proceeds Gain (loss) 2023 Timberlands 546 $ 1,340 $ 1,305 Other n/a 336 (194) Total $ 1,676 $ 1,111 2022 Timberlands 790 $ 3,130 $ 2,962 Other n/a 69 (158) Total $ 3,199 $ 2,804 2021 Timberlands 1,796 $ 5,567 $ 5,239 Other n/a — (170) Total $ 5,567 $ 5,069

Goodwill and Asset Impairments

Goodwill and Asset Impairments (Tables)	12 Months Ended
	Dec. 31, 2023
Asset Impairment Charges [Abstract]
Schedule of Asset Impairment Charges	The following table summarizes the impairment charges recorded in the accompanying consolidated statements of income (loss) under the caption “Goodwill and other asset impairment charges:” In thousands 2023 2022 2021 Plant, property and equipment $ — $ 37,936 $ — Technological know-how — 18,443 — Customer relationships — 11,695 — Tradename — 3,530 — Goodwill — 118,952 — Total $ — $ 190,556 $ —

Gain on Dispositions of Plant_2

Gain on Dispositions of Plant, Equipment and Timberlands (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Summary for Sale of Timberlands and Other Assets	The loss on sale is recapped as follows: In thousands Cash $ 5,793 Accounts receivable 2,950 Inventory 5,039 Prepaids and other current assets 8,847 Property, plant and equipment 2,513 Accounts payable and accrued liabilities (7,337) Loss on sale $ 17,805 During 2023, 2022 and 2021, we completed the following sales of assets: Dollars in thousands Acres Proceeds Gain (loss) 2023 Timberlands 546 $ 1,340 $ 1,305 Other n/a 336 (194) Total $ 1,676 $ 1,111 2022 Timberlands 790 $ 3,130 $ 2,962 Other n/a 69 (158) Total $ 3,199 $ 2,804 2021 Timberlands 1,796 $ 5,567 $ 5,239 Other n/a — (170) Total $ 5,567 $ 5,069

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2023
Disaggregation of Revenue [Abstract]
Schedule of Disaggregated Information Pertaining to Net Sales	The following table sets forth disaggregated information pertaining to our net sales from contracts with customers: Year ended December 31, In thousands 2023 2022 2021 Revenue by product category Airlaid Materials Feminine hygiene $ 217,147 $ 238,420 $ 207,116 Specialty wipes 167,702 156,516 110,201 Tabletop 109,293 117,070 76,904 Adult incontinence 29,611 27,102 22,034 Home care 27,424 25,842 25,575 Food pads 13,143 13,787 11,337 Other 22,160 22,777 17,083 586,480 601,514 470,250 Composite Fibers Food & beverage 287,040 309,065 298,859 Technical specialties 74,019 83,225 92,351 Wallcovering 61,607 53,156 88,057 Composite laminates 35,869 43,088 43,438 Metallized 24,982 35,329 34,102 483,517 523,863 556,807 Spunlace Consumer wipes 137,147 154,913 23,937 Critical cleaning 101,725 109,362 16,871 Health care 43,841 55,002 10,785 Hygiene 21,233 23,626 3,428 High performance 12,410 13,438 1,483 Beauty care 1,560 9,608 1,133 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694 Year ended December 31, In thousands 2023 2022 2021 Revenue by geography Airlaid Materials Americas $ 327,200 $ 324,710 $ 237,808 Europe, Middle East and Africa 246,073 263,843 223,718 Asia Pacific 13,207 12,961 8,724 586,480 601,514 470,250 Composite Fibers Europe, Middle East and Africa 278,951 262,750 333,608 Americas 127,805 160,541 134,753 Asia Pacific 76,761 100,572 88,446 483,517 523,863 556,807 Spunlace Americas 203,492 210,812 30,815 Europe, Middle East and Africa 88,132 110,638 19,990 Asia Pacific 26,292 44,499 6,832 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Summary of Details of Basic and Diluted Earnings (Loss) Per Share (EPS)	The following table sets forth the details of basic and diluted earnings (loss) per share (EPS): Year ended December 31, In thousands, except per share 2023 2022 2021 Net income (loss) $ (79,053) $ (194,208) $ 6,937 Weighted average common shares outstanding used in basic EPS 45,058 44,828 44,551 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — — 373 Weighted average common shares outstanding and common share equivalents used in diluted EPS 45,058 44,828 44,924 Earnings (loss) per share Continuing operations $ (1.73) $ (4.33) $ 0.15 Discontinued operations (0.02) — —
Summary of Number of Potential Anti-Dilutive Shares that have been Excluded from Computation of Diluted Earnings Per Share	The following table sets forth the potential common shares outstanding for stock options that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive: Year ended December 31, In thousands 2023 2022 2021 Potential common shares 532 770 1,079

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Summary of Changes in Accumulated Other Comprehensive Income (Losses)	The following table sets forth details of the changes in accumulated other comprehensive income (losses) for the three years ended December 31, 2023, 2022 and 2021. In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at January 1, 2023 $ (106,242) $ 11,176 $ (3,247) $ 418 $ (97,895) Other comprehensive income (loss) before reclassifications (net of tax) 15,509 735 (163) (27) 16,054 Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,356) 718 (30) (668) Net current period other comprehensive income (loss) 15,509 (621) 555 (57) 15,386 Balance at December 31, 2023 $ (90,733) $ 10,555 $ (2,692) $ 361 $ (82,509) Balance at January 1, 2022 $ (69,757) $ 1,988 $ (11,482) $ (1,053) $ (80,304) Other comprehensive income (loss) before reclassifications (net of tax) (36,485) 16,716 7,613 1,367 (10,789) Amounts reclassified from accumulated other comprehensive income (net of tax) — (7,528) 622 104 (6,802) Net current period other comprehensive income (loss) (36,485) 9,188 8,235 1,471 (17,591) Balance at December 31, 2022 $ (106,242) $ 11,176 $ (3,247) $ 418 $ (97,895) Balance at January 1, 2021 $ (42,525) $ (2,496) $ (12,844) $ (788) $ (58,653) Other comprehensive income (loss) before reclassifications (net of tax) (27,232) 4,759 611 (79) (21,941) Amounts reclassified from accumulated other comprehensive income (net of tax) — (275) 751 (186) 290 Net current period other comprehensive income (loss) (27,232) 4,484 1,362 (265) (21,651) Balance at December 31, 2021 $ (69,757) $ 1,988 $ (11,482) $ (1,053) $ (80,304)
Summary of Amounts Reclassified from Accumulated Other Comprehensive Income (Losses)	The following table sets forth the amounts reclassified from accumulated other comprehensive income (losses) for the years indicated. Year ended December 31, In thousands 2023 2022 2021 Description Line Item in Statements of Income Cash flow hedges (Note 22) Gains on cash flow hedges $ (1,785) $ (7,896) $ (382) Costs of products sold Tax expense (benefit) 429 703 22 Income tax provision (benefit) Net of tax (1,356) (7,193) (360) Loss (gain) on interest rate swaps — (335) 85 Interest expense Tax expense — — — Income tax provision (benefit) Net of tax — (335) 85 Total cash flow hedges (1,356) (7,528) (275) Retirement plan obligations (Note 13) Amortization of defined benefit pension plan items Prior service costs 23 43 47 Other, net Actuarial losses 81 653 792 Other, net Pension settlement 633 — — 737 696 839 Tax benefit (19) (74) (88) Income tax provision (benefit) Net of tax 718 622 751 Amortization of defined benefit other plan items Prior service costs 21 104 (233) Other, net Actuarial loss (gains) (51) — 47 Other, net (30) 104 (186) Tax expense — — — Income tax provision (benefit) Net of tax (30) 104 (186) Total reclassifications, net of tax $ (668) $ (6,802) $ 290

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Summary of Provision for (Benefit from) Income Taxes from Continuing Operations	The provision for (benefit from) income taxes from continuing operations consisted of the following: Year ended December 31, In thousands 2023 2022 2021 Current taxes Federal $ 2,864 $ (801) $ (570) State 974 239 584 Foreign 15,349 14,309 20,561 19,187 13,747 20,575 Deferred taxes and other Federal (258) (33) (1,159) State (1,233) 477 234 Foreign (10,685) (24,466) (12,694) (12,176) (24,022) (13,619) Income tax provision (benefit) $ 7,011 $ (10,275) $ 6,956
Summary of Domestic and Foreign Components of Pretax Income (Loss) from Continuing Operations	The following are the domestic and foreign components of pretax income (loss) from continuing operations: Year ended December 31, In thousands 2023 2022 2021 United States $ (60,092) $ (63,421) $ (44,682) Foreign (11,000) (140,971) 58,359 Total pretax income (loss) $ (71,092) $ (204,392) $ 13,677
Summary of Reconciliation of Statutory Federal Income Tax Rate to our Actual Effective Tax Rate for Continuing Operations	The following table sets forth a reconciliation of the statutory federal income tax rate to our actual effective tax rate for continuing operations. Year ended December 31, 2023 2022 2021 Federal income tax provision at statutory rate 21.0 % 21.0 % 21.0 % State income taxes, net of federal income tax benefit (2.3) (0.6) 2.7 Foreign income tax rate differential (0.1) (4.6) (1.9) Tax effect of tax credits 1.0 0.1 (0.1) Provision for (resolution of) tax matters (6.2) (1.4) 23.6 Rate changes due to enacted legislation (1.3) (0.1) 15.3 Change in reinvestment assertion — — 26.4 Effect of U.S. tax law change (1.3) (0.2) 2.8 Income inclusions from foreign subsidiaries (1.6) (0.6) 18.7 Stock-based compensation (0.5) 0.7 3.9 Nondeductible officer's compensation — (0.3) 3.9 Valuation allowance (30.1) (6.8) (3.1) Tax effect of U.S. impairment — (1.5) — Recognition of non-U.S. intangible tax basis — — (78.1) Capitalized transaction costs — — 8.9 Foreign Attribute Recognition 13.0 — — Other (1.5) (0.6) 6.9 Actual tax rate (9.9) % 5.1 % 50.9 %
Summary of Deferred Income Taxes	The sources of deferred income taxes were as follows at December 31: In thousands 2023 2022 Reserves $ 391 $ 1,489 Environmental 3,279 3,562 Compensation 2,583 2,687 Pension 1,473 2,323 Post-retirement benefits 749 795 Research & development expenses 6,062 5,986 Inventories 2,635 1,984 Tax carryforwards 101,017 61,828 Interest limitation carryforwards 59,579 9,854 Other 2,540 1,689 Deferred tax assets 180,308 92,197 Valuation allowance (126,516) (52,960) Net deferred tax assets 53,792 39,237 Property (77,518) (79,164) Intangible assets (3,940) (1,549) Inventories — — Other (5,963) (3,591) Deferred tax liabilities (87,421) (84,304) Net deferred tax liabilities $ (33,629) $ (45,067)
Summary of Non-current Deferred Tax Assets and Liabilities	Non-current deferred tax assets and liabilities are included in the following balance sheet captions: December 31, In thousands 2023 2022 Other assets $ 18,590 $ 9,321 Deferred income taxes 52,219 54,388
Summary of Unrecognized Tax Benefit	A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows: In thousands 2023 2022 2021 Balance at January 1 $ 56,506 $ 55,660 $ 46,259 Increases in tax positions for prior years 51 — 38 Decreases in tax positions for prior years — (995) (638) Acquisition related: Purchase Accounting — — 12,718 Increases in tax positions for current year 5,728 3,644 3,683 Settlements — — — Lapse in statutes of limitation (1,552) (1,803) (6,400) Balance at December 31 $ 60,733 $ 56,506 $ 55,660
Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction	The following table summarizes tax years that remain subject to examination by major jurisdiction: Open Tax Years Jurisdiction Examinations not yet initiated Examination in progress United States Federal 2014, 2015; 2020 - 2023 N/A State 2019 - 2023 N/A Canada (1) 2016 - 2018, 2023 2019-2022 Germany (1) 2020 - 2023 2016-2019 France 2023 2021-2022 United Kingdom 2022-2023 N/A Philippines 2020, 2022-2023 N/A (1) Includes provincial or similar local jurisdictions, as applicable.
Summary of Information Related to Interest and Penalties on Uncertain Tax Positions	The following table summarizes information related to interest and penalties on uncertain tax positions: As of or for the year ended December 31, In thousands 2023 2022 2021 Accrued interest payable $ 6,251 $ 4,767 $ 3,947 Accrued penalties 2,782 2,975 3,020 Interest expense 1,483 820 974

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Share Based Compensation Activity	The following table summarizes RSU and PSA activity during the past three years: Units 2023 2022 2021 Balance at January 1, 1,650,152 1,111,382 1,071,652 Granted 1,455,665 1,452,213 374,931 Forfeited (460,218) (582,457) (103,499) Shares delivered (371,660) (330,986) (231,702) Balance at December 31, 2,273,939 1,650,152 1,111,382 Stock Only Stock Appreciation Rights The following table sets forth information related to outstanding SOSARs: 2023 2022 2021 SOSARs Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 769,544 $ 21.34 1,079,113 $ 20.42 1,082,413 $ 20.40 Granted — — — — — — Exercised — — — — (3,300) 15.61 Canceled / forfeited (238,025) 19.66 (309,569) 18.12 — — Outstanding at December 31, 531,519 $ 22.10 769,544 $ 21.34 1,079,113 $ 20.42 Exercisable at December 31, 531,519 22.10 769,544 21.34 1,079,113 20.42 Vested and expected to vest 531,519 22.10 769,544 21.34 1,079,113 20.42 Compensation expense (in thousands) $ — $ — $ —
Summary of Compensation Expense	In thousands 2023 2022 2021 Compensation expense $ 2,797 $ 831 $ 5,063

Retirement Plans and Other Po_2

Retirement Plans and Other Post-Retirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Summary of Amounts Attributable to Continuing Operations	All information presented in the following tables represents amounts attributable to continuing operations. Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Change in Benefit Obligation Balance at beginning of year $ 34,729 $ 44,885 $ 3,380 $ 5,130 Service cost — — 11 15 Interest cost 1,417 1,054 178 131 Benefits paid (2,527) (2,065) (458) (529) One-time settlement (5,815) — — — Plan amendments — — 188 — Actuarial (gain)/loss 223 (8,436) (2) (1,367) Effect of currency rate changes 273 (709) — — Balance at end of year $ 28,300 $ 34,729 $ 3,297 $ 3,380 Change in Plan Assets Fair value of plan assets at beginning of year $ — $ — $ — $ — Reversion of excess plan assets — — — — Total contributions 2,527 2,065 511 529 Benefits paid (2,527) (2,065) (511) (529) Fair value of plan assets at end of year — — — — Funded status at end of year $ (28,300) $ (34,729) $ (3,297) $ (3,380)
Summary of Amounts Recognized in Consolidated Balance Sheets	Amounts recognized in the consolidated balance sheets consist of the following as of December 31: Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Current liabilities $ (2,337) $ (8,415) $ (552) $ (513) Other long-term liabilities (25,963) (26,314) (2,745) (2,886) Net amount recognized $ (28,300) $ (34,729) $ (3,297) $ (3,399)
Summary of Amounts Recognized as Accumulated Other Comprehensive Income on Pre-Tax Basis	The components of amounts recognized as “Accumulated other comprehensive income” consist of the following on a pre-tax basis: Pension Benefits Other Benefits In thousands 2023 2022 2023 2022 Prior service credit (cost) $ (104) $ (127) $ (188) $ (21) Net actuarial gain (loss) (4,339) (4,762) 1,095 984
Summary of Weighted-average Assumptions Used in Computing the Benefit Obligations	The weighted-average assumptions used in computing the benefit obligations above were as follows: Pension Benefits Other Benefits 2023 2022 2023 2022 Discount rate – benefit obligation 4.94 % 5.19 % 5.42 % 5.42 %
Summary of Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets	Information for pension plans with an accumulated benefit obligation in excess of plan assets was as follows: In thousands 2023 2022 Projected benefit obligation $ 28,300 $ 34,729 Accumulated benefit obligation 28,300 34,729 Fair value of plan assets — —
Summary of Net Periodic Benefit (Income) Expense	Net periodic benefit (income) expense includes the following components: Year ended December 31, In thousands 2023 2022 2021 Pension Benefits Interest cost $ 1,417 $ 1,054 $ 974 Amortization of prior service cost 23 43 48 Amortization of actuarial loss 81 653 790 One-time settlement charge 633 — — Total net periodic benefit expense $ 2,154 $ 1,750 $ 1,812 Other Benefits Service cost $ 11 $ 15 $ 29 Interest cost 178 131 127 Amortization of prior service credit 21 104 (233) Amortization of actuarial loss (gain) (51) — 47 Total net periodic benefit income $ 159 $ 250 $ (30)
Summary of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)	Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) were as follows: Year ended December 31, In thousands 2023 2022 Pension Benefits Actuarial (gains) loss $ 223 $ (8,436) Recognized prior service costs (23) (43) Recognized actuarial losses (715) (653) Total recognized in other comprehensive (income) loss (515) (9,132) Total recognized in net periodic benefit cost and other comprehensive loss $ 1,639 $ (7,382) Other Benefits Actuarial (gain) loss $ (2) $ (1,367) Amortization of actuarial loss 51 — Total recognized in other comprehensive loss 49 (1,367) Total recognized in net periodic benefit cost and other comprehensive loss $ 208 $ (1,117)
Summary of Weighted-average Assumptions Used in Computing the Net Periodic Benefit Expense	The weighted-average assumptions used in computing the net periodic benefit expense information above were as follows: Year ended December 31, 2023 2022 2021 Pension Benefits Discount rate – benefit expense 5.19 % 2.42 % 2.17 % Other Benefits Discount rate – benefit expense 5.42 % 2.70 % 2.30 %
Summary of Benefit Payments Expected to be Made under Non-qualified Pension Plans and Other Benefit Plans	Cash Flow Benefit payments expected to be made under our non-qualified pension plans and other benefit plans are summarized below: In thousands Pension Benefits Other Benefits 2024 $ 2,385 $ 567 2025 2,337 364 2026 2,282 321 2027 2,228 293 2028 2,158 285 2029 through 2033 10,489 1,199

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Summary of Inventories, Net of Reserves	Inventories, net of reserves were as follows: December 31, In thousands 2023 2022 Raw materials $ 82,012 $ 109,166 In-process and finished 150,220 142,331 Supplies 66,016 57,939 Total $ 298,248 $ 309,436

Plant, Equipment and Timberla_2

Plant, Equipment and Timberlands (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Summary of Plant, Equipment and Timberlands	The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows: Buildings 15 – 45 years Machinery and equipment 5 – 40 years Other 3 – 25 years Plant, equipment and timberlands at December 31 were as follows: In thousands 2023 2022 Land $ 24,145 $ 23,718 Building 233,048 228,310 Machinery, equipment & other 1,070,965 1,031,012 Accumulated depreciation (696,928) (645,404) 631,230 637,636 Construction in progress 31,686 38,175 Total $ 662,916 $ 675,811

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill and Other Intangible Assets	The following table sets forth information with respect to goodwill and other intangible assets: In thousands Balance, Beginning 2022 Impairment Purchase price allocation adjustment Translation Balance, Purchase price allocation adjustment Translation Balance, End of 2023 Goodwill Airlaid Materials $ 109,486 $ — $ — $ (4,291) $ 105,195 $ — $ 2,496 $ 107,691 Composite Fibers 78,438 (76,411) — (2,027) — — — — Spunlace 48,241 (42,541) (500) (5,200) — — — — Total $ 236,165 $ (118,952) $ (500) $ (11,518) $ 105,195 $ — $ 2,496 $ 107,691 Other Intangible Assets Balance, Beginning 2022 Impairment Amortization Translation Balance, End of 2022 Amortization Translation Balance, End of 2023 Airlaid Materials Tradename $ 4,485 $ — $ — $ (1,043) $ 3,442 $ — $ 124 $ 3,566 Accumulated amortization (603) — (170) 34 (739) (174) (31) (944) Net 3,882 — (170) (1,009) 2,703 (174) 93 2,622 Technology and related 17,825 — — (313) 17,512 — 609 18,121 Accumulated amortization (4,552) — (1,131) 246 (5,437) (1,160) (222) (6,819) Net 13,273 — (1,131) (67) 12,075 (1,160) 387 11,302 Customer relationships and related 44,585 — (1,433) 43,152 — 834 43,986 Accumulated amortization (10,512) — (3,657) 598 (13,571) (3,706) (408) (17,685) Net 34,073 — (3,657) (835) 29,581 (3,706) 426 26,301 Composite Fibers Tradename - non-amortizing 3,601 (3,530) — (71) — — — — Technology and related 38,614 (37,823) — (791) — — — — Accumulated amortization (19,224) 19,380 (424) 268 — — — — Net 19,390 (18,443) (424) (523) — — — — Customer relationships and related 34,739 (34,046) — (693) — — — — Accumulated amortization (22,104) 22,351 (587) 340 — — — — Net 12,635 (11,695) (587) (353) — — — — Spunlace Products and Tradenames 27,623 — (333) 27,290 — 2,774 30,064 Accumulated amortization (253) — (1,241) (265) (1,759) (1,323) (370) (3,452) Net 27,370 — (1,241) (598) 25,531 (1,323) 2,404 26,612 Technology and related 14,547 — (175) 14,372 — 1,461 15,833 Accumulated amortization (202) — (1,151) (102) (1,455) (1,223) (468) (3,146) Net 14,345 — (1,151) (277) 12,917 (1,223) 993 12,687 Customer relationships and related 28,003 — (337) 27,666 — 2,812 30,478 Accumulated amortization (268) — (1,487) (48) (1,803) (1,580) (286) (3,669) Net 27,735 — (1,487) (385) 25,863 (1,580) 2,526 26,809 Total intangibles 214,022 (75,399) — (5,189) 133,434 — 8,614 142,048 Total accumulated amortization (57,718) 41,731 (9,848) 1,071 (24,764) (9,166) (1,785) (35,715) Net intangibles $ 156,304 $ (33,668) $ (9,848) $ (4,118) $ 108,670 $ (9,166) $ 6,829 $ 106,333
Summary of Amortization of Intangible Assets	The following table sets forth information pertaining to amortization of intangible assets: In thousands 2023 2022 2021 Aggregate amortization expense: $ 9,166 $ 9,848 $ 9,753 Estimated amortization expense: 2024 9,408 2025 9,408 2026 9,408 2027 9,408 2028 9,408

Other Long-Term Assets (Tables)

Other Long-Term Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Other Assets, Noncurrent [Abstract]
Summary of Other Long-term Assets	Other long-term assets consist of the following: December 31, In thousands 2023 2022 Right-of-use asset operating leases $ 24,991 $ 25,420 Deferred taxes 18,590 9,321 Jacob Holm acquisition tax indemnification asset 17,229 17,229 Fox River escrow 9,009 8,777 Restricted cash - 401(K) 794 4,902 Other 10,276 12,544 Total $ 80,889 $ 78,193

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Summary of Other Current Liabilities	Other current liabilities consist of the following: December 31, In thousands 2023 2022 Accrued payroll and benefits $ 28,802 $ 32,863 Accrued tornado costs 29,000 — Income taxes payable 9,285 6,179 Accrued rebates 7,100 4,328 Operating lease liability 5,063 4,488 Accrued energy costs 4,409 3,844 Accrued interest 3,626 4,147 Other accrued expenses 25,473 32,875 Total $ 112,758 $ 88,724

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Summary of Information Related to Leases	The following table sets forth information related to our leases as of the periods indicated. December 31, Dollars in thousands 2023 2022 Right of use asset $ 24,991 $ 25,420 Weighted average discount rate 3.63 % 3.14 % Weighted average remaining maturity ( years ) 20 21 The following table sets forth operating lease expense for the periods indicated: December 31, In thousands 2023 2022 Operating lease expense $ 6,685 $ 5,867
Summary of Minimum Lease Payments	The following table sets forth required minimum lease payments for the years indicated: In thousands 2024 $ 5,671 2025 4,693 2026 2,775 2027 2,295 2028 1,694 Thereafter 18,542

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Summary of Long-term Debt	Long-term debt is summarized as follows: December 31, In thousands 2023 2022 Revolving credit facility, due Sep. 2026 $ 99,450 $ 118,685 4.750% Senior Notes, due Oct. 2029 500,000 500,000 11.25% Term loan, due Mar 2029 271,215 — Term loan, due Feb 2024 — 193,588 2.05% Term Loan, due Mar 2023 — 1,423 1.30% Term Loan, due Jun 2023 — 762 1.55% Term Loan, due Sep 2025 — 3,594 1.10% Term Loan, due Mar 2024 1,005 4,848 0.57% Term Loan, due Jul 2023 — 21,332 Total long-term debt 871,670 844,232 Less current portion (1,005) (40,435) Unamortized deferred issuance costs (17,502) (10,545) Long-term debt, net of current portion $ 853,163 $ 793,252
Summary of Amortization of Term Loan Agreements Together with Maturities of Other Long-term Debt	The following schedule sets forth the amortization of our term loan agreements together with the maturity of our other long-term debt during the indicated year. In thousands 2024 $ 1,005 2025 — 2026 99,450 2027 — 2028 — Thereafter 776,250

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Summary of Carrying Value and Fair Value of Long-term Debt	The following table sets forth the carrying value and fair value of long-term debt as of December 31: 2023 2022 In thousands Carrying Fair Carrying Fair Revolving credit facility, due Sep. 2026 $ 99,450 $ 99,450 $ 118,685 $ 118,685 4.750% Senior Notes, due Oct. 2029 500,000 346,250 500,000 301,250 11.25% Term loan, due Mar 2029 271,215 282,586 — 188,998 Term loan, due Feb 2024 — — 193,588 — 2.05% Term Loan, due Mar 2023 — — 1,423 1,418 1.30% Term Loan, due Jun 2023 — — 762 754 1.55% Term Loan, due Sep 2025 — — 3,594 3,430 1.10% Term Loan, due Mar 2024 1,005 993 4,848 4,721 0.57% Term Loan, due Jul 2023 — — 21,332 20,932 Total long-term debt $ 871,670 $ 729,279 $ 844,232 $ 640,188

Financial Derivatives and Hed_2

Financial Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Outstanding Derivatives Used to Hedge Foreign Exchange Risks	We had the following outstanding derivatives that were used to hedge foreign exchange risks associated with forecasted transactions and designated as hedging instruments: December 31, In thousands 2023 2022 Derivative Sell/Buy - sell notional Euro / British Pound 15,210 18,961 Philippine Peso / Euro 137,449 — U.S. Dollar / British Pound 18,470 34,501 U.S. Dollar / Euro 277 824 Sell/Buy - buy notional Euro / Philippine Peso 788,342 1,030,114 British Pound / Philippine Peso 923,653 1,144,839 Euro / U.S. Dollar 93,397 78,435 U.S. Dollar / Canadian Dollar 30,914 36,423 British Pound / U.S. Dollar 2,211 — The following sets forth derivatives used to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities: December 31, In thousands 2023 2022 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 22,800 28,600 British Pound / Euro 3,500 2,800 U.S. Dollar / Swiss Franc 13,620 — British Pound / Swiss Franc 2,240 2,535 Euro / Swiss Franc 4,940 — Euro / U.S. Dollar 11,000 9,630 U.S Dollar / Philipine Peso 6,700 — Sell/Buy - buy notional Euro / U.S. Dollar 10,200 2,900 British Pound / Euro 6,470 15,950 Swiss Franc / Euro — 2,250 Swiss Franc / U.S. Dollar — 930 Chinese Yuan / U.S. Dollar — 4,400 U.S. Dollar / Canadian Dollar 1,120 —
Summary of Fair Values of Derivative Instruments	The following table summarizes the fair values of derivative instruments as of December 31 for the year indicated and the line items in the accompanying consolidated balance sheets where the instruments are recorded: December 31, December 31, In thousands 2023 2022 2023 2022 Balance sheet caption Prepaid Expenses Other Current Designated as hedging: Forward foreign currency exchange contracts $ 851 $ 1,795 $ 1,653 $ 2,368 Interest rate swap — — — — Not designated as hedging: Forward foreign currency exchange contracts 937 797 155 317
Summary of Income or Loss from Derivative Instruments Recognized in Results of Operations	The following table summarizes the amount of income or loss from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying consolidated statements of income (loss) where the results are recorded: Year ended December 31, In thousands 2023 2022 2021 Designated as hedging: Forward foreign currency exchange contracts: Cost of products sold $ (1,785) $ (7,896) $ (382) Interest expense — (335) 85 Not designated as hedging: Forward foreign currency exchange contracts: Other – net (1,378) 1,240 2,666
Summary of Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income	A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income is as follows: In thousands 2023 2022 Balance at January 1, $ 242 $ 2,889 Deferred gains on cash flow hedges 735 5,584 Reclassified to earnings (1,785) (8,231) Balance at December 31, $ (808) $ 242

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Summary of Outstanding Shares of Common Stock	The following table summarizes outstanding shares of common stock: Year ended December 31, In thousands 2023 2022 2021 Shares outstanding at beginning of year 44,794 44,549 44,368 Treasury shares issued for: Restricted stock awards and performance share awards 293 245 181 Shares outstanding at end of year 45,087 44,794 44,549

Commitments, Contingencies an_2

Commitments, Contingencies and Legal Proceedings (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Summary of Minimum Annual Payment Due on Noncancelable Operating Lease	The following table summarizes the minimum annual payments due on noncancellable operating leases and other similar contractual obligations having initial or remaining terms in excess of one year: In thousands Leases Other 2024 $ 5,671 $ 14,446 2025 4,693 — 2026 2,775 — 2027 2,295 — 2028 1,694 — Thereafter 18,542 —
Summary of Reserves	Reserves for the Site Our reserve for past and future government oversight costs and long-term monitoring is set forth below: Year ended December 31, In thousands 2023 2022 Balance at January 1, $ 14,547 $ 16,200 Payments (1,049) (1,848) Accretion 199 195 Balance at December 31, $ 13,697 $ 14,547

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Summary of Financial and Other Information by Segment	The following table sets forth net sales, profitability and other information by segment: Year ended December 31, In thousands, except per share 2023 2022 2021 Net Sales Airlaid Material $ 586,480 $ 601,514 $ 470,250 Composite Fibers 483,517 523,863 556,807 Spunlace 317,916 365,949 57,637 Inter-segment sales elimination (2,397) — — Total $ 1,385,516 $ 1,491,326 $ 1,084,694 Operating income (loss) Airlaid Material $ 43,207 $ 54,809 $ 42,244 Composite Fibers 21,347 16,923 37,422 Spunlace (2,068) (9,289) (1,338) Other and unallocated (59,774) (226,394) (49,714) Total $ 2,712 $ (163,951) $ 28,614 Depreciation and amortization Airlaid Material $ 30,464 $ 30,114 $ 28,101 Composite Fibers 15,665 19,632 27,690 Spunlace 13,245 11,850 1,693 Other and unallocated 3,873 5,128 3,937 Total $ 63,247 $ 66,724 $ 61,421 Capital expenditures Airlaid Material $ 9,885 $ 9,691 $ 8,431 Composite Fibers 12,286 15,730 11,912 Spunlace 9,047 6,689 3,810 Other and unallocated 2,552 5,630 5,884 Total $ 33,770 $ 37,740 $ 30,037 Tons shipped (metric) Airlaid Material 156,442 164,844 148,134 Composite Fibers 94,742 103,092 132,196 Spunlace 61,618 72,725 12,514 Inter-segment sales elimination (1,258) — — Total 311,544 340,661 292,844 Plant, equipment and timberlands, net Airlaid Material $ 335,456 $ 347,142 $ 371,324 Composite Fibers 146,022 145,959 202,445 Spunlace 160,294 159,648 161,478 Other and unallocated 21,144 23,062 23,565 Total $ 662,916 $ 675,811 $ 758,812
Summary of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands	Our net sales to external customers and location of net plant, equipment and timberlands are summarized below. Net sales are attributed to countries based upon origin of shipment. 2023 2022 2021 In thousands Net sales Plant, Equipment and Timberlands – Net Net sales Plant, Equipment and Timberlands – Net Net sales Plant, Equipment and Timberlands – Net United States $ 497,370 $ 304,895 $ 508,679 $ 317,191 $ 255,086 $ 326,668 Germany 531,241 197,267 537,363 194,586 513,043 251,375 United Kingdom 79,640 42,198 74,487 43,015 82,144 50,420 Canada 133,793 57,408 146,393 61,516 120,808 65,291 Other 143,472 61,148 224,404 59,503 113,613 65,057 Total $ 1,385,516 $ 662,916 $ 1,491,326 $ 675,811 $ 1,084,694 $ 758,812

Organization (Details)

Organization (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) employee manufacturing_site	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net sales | $	$ 1,385,516	$ 1,491,326	$ 1,084,694
Number of employees employed | employee	2,980
Number of manufacturing sites | manufacturing_site	15

Accounting Policies - Schedule

Accounting Policies - Schedule of Plant, Equipment and Timberlands (Details)	Dec. 31, 2023
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	15 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	45 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	40 years
Other | Minimum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	3 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Range of estimated service lives	25 years

Accounting Policies - Additiona

Accounting Policies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) operating_segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of segments | operating_segment	3
Employee retention credit percentage			70%
Employee retention credit	$ 0.1	$ 8.6
Cost of products sold
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Employee retention credit		7.3
Selling, General and Administrative Expenses
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Employee retention credit		$ 1.3

Acquisitions (Details)

Acquisitions (Details) t in Thousands			12 Months Ended
	Oct. 29, 2021 USD ($) employee	May 13, 2021 USD ($) employee t	Dec. 31, 2020 USD ($)	Dec. 31, 2023 USD ($) employee	Dec. 31, 2022 USD ($)	Oct. 25, 2021 USD ($)
Business Acquisition [Line Items]
Number of employees at manufacturing facility | employee				2,980
Carrying Value				$ 871,670,000	$ 844,232,000
4.750% Senior Notes, due Oct. 2029
Business Acquisition [Line Items]
Carrying Value				$ 500,000,000	$ 500,000,000	$ 500,000,000
Mount Holly
Business Acquisition [Line Items]
Business acquisition purchase price		$ 170,900,000
Annual production capacity | t		37
Number of employees at manufacturing facility | employee		140
Acquired intangible assets estimated remaining life		11 years
Mount Holly | Minimum
Business Acquisition [Line Items]
Range of estimated service lives		5 years
Mount Holly | Maximum
Business Acquisition [Line Items]
Range of estimated service lives		35 years
Jacob Holm
Business Acquisition [Line Items]
Business acquisition purchase price	$ 304,000,000
Number of employees at manufacturing facility | employee	760
Annual sales of acquiree			$ 400,000,000
Indemnification asset	$ 17,200,000
Jacob Holm | Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets estimated remaining life	20 years
Jacob Holm | Minimum | Tradename
Business Acquisition [Line Items]
Acquired intangible assets estimated remaining life	15 years
Jacob Holm | Minimum | Technical know-how
Business Acquisition [Line Items]
Acquired intangible assets estimated remaining life	8 years
Jacob Holm | Maximum | Tradename
Business Acquisition [Line Items]
Acquired intangible assets estimated remaining life	20 years
Jacob Holm | Maximum | Technical know-how
Business Acquisition [Line Items]
Acquired intangible assets estimated remaining life	20 years
Jacob Holm | 4.750% Senior Notes, due Oct. 2029 | Senior Notes
Business Acquisition [Line Items]
Carrying Value	$ 500,000,000

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Disposal group, general and administrative expense	$ 1	$ 0.1
Disposal group, general and administrative expense credit for reversal during period			$ 0.2
Net operating cash outflows	$ 1.2	$ 0.3	$ 1
Discontinued Operations, Disposed of by Sale | Specialty Papers
Schedule of Equity Method Investments [Line Items]
Selling price of business				$ 360

Sale of Ober-schmitten, Germa_3

Sale of Ober-schmitten, Germany Facility - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 EUR (€)
Restructuring Cost And Reserve [Line Items]
Loss on sale of Ober-Schmitten and other non-strategic operation	$ 18,365	$ 0	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ober-Schmitten, German Facility
Restructuring Cost And Reserve [Line Items]
Selling price of business | €				€ 1
Loss on sale of Ober-Schmitten and other non-strategic operation	$ 17,805

Sale of Ober-schmitten, Germa_4

Sale of Ober-schmitten, Germany Facility - Loss on Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale	$ 18,365	$ 0	$ 0
Ober-Schmitten, German Facility | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Cash	5,793
Accounts receivable	2,950
Inventory	5,039
Prepaids and other current assets	8,847
Property, plant and equipment	2,513
Accounts payable and accrued liabilities	(7,337)
Loss on sale	$ 17,805

Goodwill and Asset Impairment_2

Goodwill and Asset Impairments - Additional Information (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill and asset impairment charges				$ 0
Impairment		$ 42,500,000		0	$ 118,952,000	$ 0
Goodwill and other asset impairment charges				0	190,556,000	$ 0
Bad debt expense (reversal)				$ (1,400,000)
Inventory reserve	$ 300,000				300,000
Russian and Ukrainian
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill and other asset impairment charges			$ 117,300,000
Bad debt expense (reversal)					2,900,000
Composite Fibers
Impaired Long-Lived Assets Held and Used [Line Items]
Goodwill and asset impairment charges	30,700,000
Impairment	20,300,000				$ 76,411,000
Goodwill and other asset impairment charges	$ 10,400,000

Goodwill and Asset Impairment_3

Goodwill and Asset Impairments - Schedule of Asset Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Indefinite-Lived Intangible Assets [Line Items]
Plant, property and equipment		$ 0	$ 37,936	$ 0
Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag		Plant, property and equipment
Impairment of intangible assets, finite-lived			(41,731)
Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag		Technological know-how
Tradename			75,399
Impairment Of Intangible Asset Indefinite Lived Excluding Goodwill Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag		Tradename
Goodwill	$ 42,500	$ 0	118,952	0
Total		0	190,556	0
Tradename
Indefinite-Lived Intangible Assets [Line Items]
Tradename		0	3,530	0
Technological know-how
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, finite-lived		0	18,443	0
Customer relationships
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, finite-lived		$ 0	$ 11,695	$ 0

Gain on Dispositions of Plant_3

Gain on Dispositions of Plant, Equipment and Timberlands (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) a	Dec. 31, 2022 USD ($) a	Dec. 31, 2021 USD ($) a
Property, Plant and Equipment [Line Items]
Proceeds	$ 1,676	$ 3,199	$ 5,567
Gain (loss)	$ 1,111	$ 2,804	$ 5,069
Timberlands
Property, Plant and Equipment [Line Items]
Acres | a	546	790	1,796
Proceeds	$ 1,340	$ 3,130	$ 5,567
Gain (loss)	1,305	2,962	5,239
Other
Property, Plant and Equipment [Line Items]
Proceeds	336	69	0
Gain (loss)	$ (194)	$ (158)	$ (170)

Revenue (Details)

Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Net Sales	$ 1,385,516	$ 1,491,326	$ 1,084,694
Operating Segments | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	586,480	601,514	470,250
Operating Segments | Airlaid Materials | Americas
Disaggregation Of Revenue [Line Items]
Net Sales	327,200	324,710	237,808
Operating Segments | Airlaid Materials | Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Net Sales	246,073	263,843	223,718
Operating Segments | Airlaid Materials | Asia Pacific
Disaggregation Of Revenue [Line Items]
Net Sales	13,207	12,961	8,724
Operating Segments | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	483,517	523,863	556,807
Operating Segments | Composite Fibers | Americas
Disaggregation Of Revenue [Line Items]
Net Sales	127,805	160,541	134,753
Operating Segments | Composite Fibers | Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Net Sales	278,951	262,750	333,608
Operating Segments | Composite Fibers | Asia Pacific
Disaggregation Of Revenue [Line Items]
Net Sales	76,761	100,572	88,446
Operating Segments | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	317,916	365,949	57,637
Operating Segments | Spunlace | Americas
Disaggregation Of Revenue [Line Items]
Net Sales	203,492	210,812	30,815
Operating Segments | Spunlace | Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Net Sales	88,132	110,638	19,990
Operating Segments | Spunlace | Asia Pacific
Disaggregation Of Revenue [Line Items]
Net Sales	26,292	44,499	6,832
Operating Segments | Product | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	586,480	601,514	470,250
Operating Segments | Product | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	483,517	523,863	556,807
Operating Segments | Product | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	317,916	365,949	57,637
Operating Segments | Feminine hygiene | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	217,147	238,420	207,116
Operating Segments | Specialty wipes | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	167,702	156,516	110,201
Operating Segments | Tabletop | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	109,293	117,070	76,904
Operating Segments | Adult incontinence | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	29,611	27,102	22,034
Operating Segments | Home care | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	27,424	25,842	25,575
Operating Segments | Food pads | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	13,143	13,787	11,337
Operating Segments | Other | Airlaid Materials
Disaggregation Of Revenue [Line Items]
Net Sales	22,160	22,777	17,083
Operating Segments | Food & beverage | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	287,040	309,065	298,859
Operating Segments | Technical specialties | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	74,019	83,225	92,351
Operating Segments | Wallcovering | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	61,607	53,156	88,057
Operating Segments | Composite laminates | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	35,869	43,088	43,438
Operating Segments | Metallized | Composite Fibers
Disaggregation Of Revenue [Line Items]
Net Sales	24,982	35,329	34,102
Operating Segments | Consumer wipes | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	137,147	154,913	23,937
Operating Segments | Critical cleaning | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	101,725	109,362	16,871
Operating Segments | Health care | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	43,841	55,002	10,785
Operating Segments | Hygiene | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	21,233	23,626	3,428
Operating Segments | High performance | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	12,410	13,438	1,483
Operating Segments | Beauty care | Spunlace
Disaggregation Of Revenue [Line Items]
Net Sales	1,560	9,608	1,133
Inter-segment sales elimination
Disaggregation Of Revenue [Line Items]
Net Sales	$ (2,397)	$ 0	$ 0

Earnings Per Share - Summary of

Earnings Per Share - Summary of Details of Basic and Diluted Earnings (Loss) Per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ (79,053)	$ (194,208)	$ 6,937
Weighted average common shares outstanding used in basic EPS (in shares)	45,058	44,828	44,551
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs (in shares)	0	0	373
Weighted average common shares outstanding and common share equivalents used in diluted EPS (in shares)	45,058	44,828	44,924
Earnings (loss) per share
Continuing operations (in dollars per share)	$ (1.73)	$ (4.33)	$ 0.15
Discontinued operations (in dollars per share)	$ (0.02)	$ 0	$ 0

Earnings Per Share - Summary _2

Earnings Per Share - Summary of Number of Potential Anti-Dilutive Shares that have been Excluded from Computation of Diluted Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Potential common shares (in shares)	532	770	1,079

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 318,004	$ 542,762	$ 577,932
Other comprehensive income (loss) before reclassifications (net of tax)	16,054	(10,789)	(21,941)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(668)	(6,802)	290
Other comprehensive income (loss)	15,386	(17,591)	(21,651)
Ending balance	256,854	318,004	542,762
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(97,895)	(80,304)	(58,653)
Ending balance	(82,509)	(97,895)	(80,304)
Currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(106,242)	(69,757)	(42,525)
Other comprehensive income (loss) before reclassifications (net of tax)	15,509	(36,485)	(27,232)
Amounts reclassified from accumulated other comprehensive income (net of tax)	0	0	0
Other comprehensive income (loss)	15,509	(36,485)	(27,232)
Ending balance	(90,733)	(106,242)	(69,757)
Unrealized gain (loss) on cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	11,176	1,988	(2,496)
Other comprehensive income (loss) before reclassifications (net of tax)	735	16,716	4,759
Amounts reclassified from accumulated other comprehensive income (net of tax)	(1,356)	(7,528)	(275)
Other comprehensive income (loss)	(621)	9,188	4,484
Ending balance	10,555	11,176	1,988
Defined Benefit Plans | Change in pensions
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,247)	(11,482)	(12,844)
Other comprehensive income (loss) before reclassifications (net of tax)	(163)	7,613	611
Amounts reclassified from accumulated other comprehensive income (net of tax)	718	622	751
Other comprehensive income (loss)	555	8,235	1,362
Ending balance	(2,692)	(3,247)	(11,482)
Defined Benefit Plans | Change in other postretirement defined benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	418	(1,053)	(788)
Other comprehensive income (loss) before reclassifications (net of tax)	(27)	1,367	(79)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(30)	104	(186)
Other comprehensive income (loss)	(57)	1,471	(265)
Ending balance	$ 361	$ 418	$ (1,053)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income (Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Gains on cash flow hedges	$ 1,255,809	$ 1,342,524	$ 939,899
Tax expense (benefit)	7,011	(10,275)	6,956
Loss (gain) on interest rate swaps	64,739	33,207	12,353
Other, net	10,551	7,642	2,657
Income (loss) before income taxes	71,092	204,392	(13,677)
Net of tax	79,053	194,208	(6,937)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
One-time settlement charge	633	0	0
Reclassifications Out of Accumulated Other Comprehensive Income
Defined Benefit Plan Disclosure [Line Items]
Net of tax	(668)	(6,802)	290
Reclassifications Out of Accumulated Other Comprehensive Income | Gains on cash flow hedges
Defined Benefit Plan Disclosure [Line Items]
Net of tax	(1,356)	(7,528)	(275)
Reclassifications Out of Accumulated Other Comprehensive Income | Gains on cash flow hedges | Interest Rate Swap
Defined Benefit Plan Disclosure [Line Items]
Tax expense (benefit)	0	0	0
Loss (gain) on interest rate swaps	0	(335)	85
Net of tax	0	(335)	85
Reclassifications Out of Accumulated Other Comprehensive Income | Prior service costs | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other, net	23	43	47
Reclassifications Out of Accumulated Other Comprehensive Income | Prior service costs | Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other, net	21	104	(233)
Reclassifications Out of Accumulated Other Comprehensive Income | Actuarial losses | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Other, net	81	653	792
Reclassifications Out of Accumulated Other Comprehensive Income | Actuarial losses | Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Other, net	(51)	0	47
Reclassifications Out of Accumulated Other Comprehensive Income | Pension settlement | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
One-time settlement charge	633	0	0
Reclassifications Out of Accumulated Other Comprehensive Income | Change in Pensions | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Tax expense (benefit)	(19)	(74)	(88)
Income (loss) before income taxes	737	696	839
Net of tax	718	622	751
Reclassifications Out of Accumulated Other Comprehensive Income | Change in Pensions | Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Tax expense (benefit)	0	0	0
Income (loss) before income taxes	(30)	104	(186)
Net of tax	(30)	104	(186)
Cash Flow Hedges | Reclassifications Out of Accumulated Other Comprehensive Income | Gains on cash flow hedges
Defined Benefit Plan Disclosure [Line Items]
Gains on cash flow hedges	(1,785)	(7,896)	(382)
Tax expense (benefit)	429	703	22
Net of tax	$ (1,356)	$ (7,193)	$ (360)

Income Taxes - Summary of Provi

Income Taxes - Summary of Provision for (Benefit from) Income Taxes from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current taxes
Federal	$ 2,864	$ (801)	$ (570)
State	974	239	584
Foreign	15,349	14,309	20,561
Total current taxes	19,187	13,747	20,575
Deferred taxes and other
Federal	(258)	(33)	(1,159)
State	(1,233)	477	234
Foreign	(10,685)	(24,466)	(12,694)
Total deferred taxes and other	(12,176)	(24,022)	(13,619)
Income tax provision (benefit)	$ 7,011	$ (10,275)	$ 6,956

Income Taxes - Summary of Domes

Income Taxes - Summary of Domestic and Foreign Components of Pretax Income (Loss) from Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
United States	$ (60,092)	$ (63,421)	$ (44,682)
Foreign	(11,000)	(140,971)	58,359
Income (loss) before income taxes	$ (71,092)	$ (204,392)	$ 13,677

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Statutory Federal Income Tax Rate to our Actual Effective Tax Rate for Continuing Operations (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal income tax provision at statutory rate	21%	21%	21%
State income taxes, net of federal income tax benefit	(2.30%)	(0.60%)	2.70%
Foreign income tax rate differential	(0.10%)	(4.60%)	(1.90%)
Tax effect of tax credits	1%	0.10%	(0.10%)
Provision for (resolution of) tax matters	(6.20%)	(1.40%)	23.60%
Rate changes due to enacted legislation	(1.30%)	(0.10%)	15.30%
Change in reinvestment assertion	0%	0%	26.40%
Effect of U.S. tax law change	(1.30%)	(0.20%)	2.80%
Income inclusions from foreign subsidiaries	(1.60%)	(0.60%)	18.70%
Stock-based compensation	(0.50%)	0.70%	3.90%
Nondeductible officer's compensation	0%	(0.30%)	3.90%
Valuation allowance	(30.10%)	(6.80%)	(3.10%)
Tax effect of U.S. impairment	0%	(1.50%)	0%
Recognition of non-U.S. intangible tax basis	0%	0%	(78.10%)
Capitalized transaction costs	0%	0%	8.90%
Foreign Attribute Recognition	13%	0%	0%
Other	(1.50%)	(0.60%)	6.90%
Actual tax rate	(9.90%)	5.10%	50.90%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Foreign		$ (10,685)	$ (24,466)	$ (12,694)
Notional interest deduction carryforward, foreign		9,300
Impairment	$ 42,500	0	118,952	0
Operating loss carryforwards subject to expiration		800
Operating loss carryforwards not subject to expiration		123,500
Valuation allowance		126,516	52,960
Research and development, tax credit		500	700	0
Unremitted earnings of subsidiaries outside the United States, reinvested		94,000	130,000
Deferred tax liability, unremitted earnings of subsidiary		2,300
Gross unrecognized tax benefits		60,733	$ 56,506	$ 55,660	$ 46,259
Unrecognized tax benefits that would impact effective tax rate		58,100
Minimum
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months		0
Maximum
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months		8,400
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards		124,300
Tax credit carryforwards		15,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards		203,200
Tax credit carryforwards		3,600
Foreign Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 260,500

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Reserves	$ 391	$ 1,489
Environmental	3,279	3,562
Compensation	2,583	2,687
Pension	1,473	2,323
Post-retirement benefits	749	795
Research & development expenses	6,062	5,986
Inventories	2,635	1,984
Tax carryforwards	101,017	61,828
Interest limitation carryforwards	59,579	9,854
Other	2,540	1,689
Deferred tax assets	180,308	92,197
Valuation allowance	(126,516)	(52,960)
Net deferred tax assets	53,792	39,237
Property	(77,518)	(79,164)
Intangible assets	(3,940)	(1,549)
Inventories	0	0
Other	(5,963)	(3,591)
Deferred tax liabilities	(87,421)	(84,304)
Net deferred tax liabilities	$ (33,629)	$ (45,067)

Income Taxes - Summary of Non-c

Income Taxes - Summary of Non-current Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Other assets	$ 18,590	$ 9,321
Deferred income taxes	$ 52,219	$ 54,388

Income Taxes - Summary of Unrec

Income Taxes - Summary of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 56,506	$ 55,660	$ 46,259
Increases in tax positions for prior years	51	0	38
Decreases in tax positions for prior years	0	(995)	(638)
Purchase Accounting	0	0	12,718
Increases in tax positions for current year	5,728	3,644	3,683
Settlements	0	0	0
Lapse in statutes of limitation	(1,552)	(1,803)	(6,400)
Ending balance	$ 60,733	$ 56,506	$ 55,660

Income Taxes - Summary of Infor

Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Accrued interest payable	$ 6,251	$ 4,767	$ 3,947
Accrued penalties	2,782	2,975	3,020
Interest expense	$ 1,483	$ 820	$ 974

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details)		12 Months Ended
	May 05, 2023 shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) day $ / shares shares	Dec. 31, 2021 $ / shares shares
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation benefit | $			$ 3,100,000
Restricted Stock Units (RSU) and Performance Share Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under performance share awards (in shares)		1,455,665	1,452,213	374,931
Unrecognized compensation expense for outstanding RSUs and PSAs | $		$ 4,400,000
The weighted average remaining period over which the expense will be recognized		1 year 9 months 14 days
Restricted Stock Units (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative performance target period		3 years	3 years	3 years
Additional service period (in years)		3 years
Vesting term			3 years
Restricted Stock Units (RSU) | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, shares issued in period (in shares)			240,000
Restricted Stock Units (RSU) | Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			2 years
Percentage of awards granted (as a percent)			50%
Restricted Stock Units (RSU) | Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term			3 years
Restricted Stock Units (RSU) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional service period (in years)		1 year	1 year	1 year
Restricted Stock Units (RSU) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional service period (in years)		3 years	3 years	3 years
Performance Share Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative performance target period		2 years
Additional service period (in years)		1 year
Total shareholder return period		3 years
Grants under performance share awards (in shares)		758,222	725,812	162,480
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 3.69	$ 8.04	$ 16.71
Performance Share Awards (PSAs) | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, shares issued in period (in shares)			360,000
Performance period			3 years
Performance Share Awards (PSAs) | Chief Operating Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of award type		60%
Performance Share Awards (PSAs) | Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		2 years	2 years	2 years
Share price (in dollars per share) | $ / shares			$ 10
Consecutive trading days | day			20
Performance target (as a percent)			50%
Performance Share Awards (PSAs) | Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term		3 years	3 years	3 years
Share price (in dollars per share) | $ / shares			$ 18
Consecutive trading days | day			20
Performance target (as a percent)			100%
Awards Other Than Certain Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shareholder return period		3 years
Time Based RSUs | Chief Operating Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of award type		40%
Stock Only Stock Appreciation Rights (SOSARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award, shares issued in period (in shares)		0	0	0
Intrinsic value of SOSARs vested and expected to vest | $		$ 0
Remaining weighted average contractual life of outstanding SOSARs		1 year 3 months 3 days
Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares available for issuance (in shares)	675,000
Common stock available for future issuance (in shares)		2,385,486
Vesting term		1 year	1 year	1 year

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of RSU and PSA Activity (Details) - Restricted Stock Units (RSU) and Performance Share Awards (PSAs) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Beginning balance (in shares)	1,650,152	1,111,382	1,071,652
Granted (in shares)	1,455,665	1,452,213	374,931
Forfeited (in shares)	(460,218)	(582,457)	(103,499)
Shares delivered (in shares)	(371,660)	(330,986)	(231,702)
Ending balance (in shares)	2,273,939	1,650,152	1,111,382

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Stock Units (RSU) and Performance Share Awards (PSAs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,797	$ 831	$ 5,063

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARs (Details) - Stock Only Stock Appreciation Rights (SOSARs) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Beginning balance (in shares)	769,544	1,079,113	1,082,413
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	(3,300)
Canceled / forfeited (in shares)	(238,025)	(309,569)	0
Ending balance (in shares)	531,519	769,544	1,079,113
Exercisable (in shares)	531,519	769,544	1,079,113
Vested and expected to vest (in shares)	531,519	769,544	1,079,113
Compensation expense	$ 0	$ 0	$ 0
Wtd Avg Exercise Price
Beginning balance (in dollars per share)	$ 21.34	$ 20.42	$ 20.40
Granted (in dollars per share)	0	0	0
Exercised (in dollars per share)	0	0	15.61
Canceled / forfeited (in dollars per share)	19.66	18.12	0
Ending balance (in dollars per share)	22.10	21.34	20.42
Exercisable (in dollars per share)	22.10	21.34	20.42
Vested and expected to vest (in dollars per share)	$ 22.10	$ 21.34	$ 20.42

Retirement Plans and Other Po_3

Retirement Plans and Other Post-Retirement Benefits - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Employer contribution of employee's eligible earnings, percentage	7%
Medical insurance coverage with a subsidy cap	$ 10
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent
Defined contribution plans employees contribution	50%
Employer discretionary contribution of employee's eligible earnings, percentage	7%	7.50%	10%
Expense associated with Defined Contribution Plans	$ 4,300	$ 2,700	$ 2,400
Deferred Compensation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer contribution of employee's eligible earnings, percentage	7%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Unfunded projected benefit obligation	$ 28,300	34,729	44,885
One-time settlement	5,815	0
Pension settlement charge	$ 633	$ 0	0
Discount rates	4.94%	5.19%
Pension Benefits | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rates	5.41%
Pension Benefits | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.71%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Unfunded projected benefit obligation	$ 3,297	$ 3,380	$ 5,130
One-time settlement	$ 0	$ 0
Discount rates	5.42%	5.42%

Retirement Plans and Other Po_4

Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Attributable to Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Change in Benefit Obligation
Balance at beginning of year	$ 34,729	$ 44,885
Service cost	0	0
Interest cost	1,417	1,054	$ 974
Benefits paid	(2,527)	(2,065)
One-time settlement	(5,815)	0
Plan amendments	0	0
Actuarial (gain)/loss	223	(8,436)
Effect of currency rate changes	273	(709)
Balance at end of year	28,300	34,729	44,885
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Reversion of excess plan assets		0	0
Total contributions	2,527	2,065
Benefits paid	(2,527)	(2,065)
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(28,300)	(34,729)
Other Benefits
Change in Benefit Obligation
Balance at beginning of year	3,380	5,130
Service cost	11	15	29
Interest cost	178	131	127
Benefits paid	(458)	(529)
One-time settlement	0	0
Plan amendments	188	0
Actuarial (gain)/loss	(2)	(1,367)
Effect of currency rate changes	0	0
Balance at end of year	3,297	3,380	5,130
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Reversion of excess plan assets		0	0
Total contributions	511	529
Benefits paid	(511)	(529)
Fair value of plan assets at end of year	0	0	$ 0
Funded status at end of year	$ (3,297)	$ (3,380)

Retirement Plans and Other Po_5

Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	$ (2,337)	$ (8,415)
Other long-term liabilities	(25,963)	(26,314)
Net amount recognized	(28,300)	(34,729)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(552)	(513)
Other long-term liabilities	(2,745)	(2,886)
Net amount recognized	$ (3,297)	$ (3,399)

Retirement Plans and Other Po_6

Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized as Accumulated Other Comprehensive Income on Pre-Tax Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service credit (cost)	$ (104)	$ (127)
Net actuarial gain (loss)	(4,339)	(4,762)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service credit (cost)	(188)	(21)
Net actuarial gain (loss)	$ 1,095	$ 984

Retirement Plans and Other Po_7

Retirement Plans and Other Post-Retirement Benefits - Summary of Weighted-average Assumptions Used in Computing the Benefit Obligations (Details)	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligation	4.94%	5.19%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit obligation	5.42%	5.42%

Retirement Plans and Other Po_8

Retirement Plans and Other Post-Retirement Benefits - Summary of Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Projected benefit obligation	$ 28,300	$ 34,729
Accumulated benefit obligation	28,300	34,729
Fair value of plan assets	$ 0	$ 0

Retirement Plans and Other Po_9

Retirement Plans and Other Post-Retirement Benefits - Summary of Net Periodic Benefit (Income) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	1,417	1,054	$ 974
Amortization of prior service cost	23	43	48
Amortization of actuarial loss (gain)	81	653	790
One-time settlement charge	633	0	0
Total net periodic benefit expense	2,154	1,750	1,812
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	15	29
Interest cost	178	131	127
Amortization of prior service cost	21	104	(233)
Amortization of actuarial loss (gain)	(51)	0	47
Total net periodic benefit expense	$ 159	$ 250	$ (30)

Retirement Plans and Other P_10

Retirement Plans and Other Post-Retirement Benefits - Summary of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 223	$ (8,436)
Recognized prior service costs	(23)	(43)
Amortization of actuarial loss	(715)	(653)
Total recognized in other comprehensive (income) loss	(515)	(9,132)
Total recognized in net periodic benefit cost and other comprehensive loss	1,639	(7,382)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	(2)	(1,367)
Amortization of actuarial loss	51	0
Total recognized in other comprehensive (income) loss	49	(1,367)
Total recognized in net periodic benefit cost and other comprehensive loss	$ 208	$ (1,117)

Retirement Plans and Other P_11

Retirement Plans and Other Post-Retirement Benefits - Summary of Weighted-average Assumptions Used in Computing the Net Periodic Benefit Expense (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit expense	5.19%	2.42%	2.17%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate – benefit expense	5.42%	2.70%	2.30%

Retirement Plans and Other P_12

Retirement Plans and Other Post-Retirement Benefits - Summary of Benefit Payments Expected to be Made under Non-qualified Pension Plans and Other Benefit Plans (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2024	$ 2,385
2025	2,337
2026	2,282
2027	2,228
2028	2,158
2029 through 2033	10,489
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
2024	567
2025	364
2026	321
2027	293
2028	285
2029 through 2033	$ 1,199

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 82,012	$ 109,166
In-process and finished	150,220	142,331
Supplies	66,016	57,939
Total	$ 298,248	$ 309,436

Plant, Equipment and Timberla_3

Plant, Equipment and Timberlands - Summary of Plant, Equipment and Timberlands (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (696,928)	$ (645,404)
Subtotal	631,230	637,636
Construction in progress	31,686	38,175
Total	662,916	675,811	$ 758,812
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,145	23,718
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	233,048	228,310
Machinery, equipment & other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,070,965	$ 1,031,012

Plant, Equipment and Timberla_4

Plant, Equipment and Timberlands - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Accrued capital expenditures	$ 4.6	$ 5.2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill
Beginning balance			$ 105,195	$ 236,165
Impairment		$ (42,500)	0	(118,952)	$ 0
Purchase price allocation adjustment			0	(500)
Translation			2,496	(11,518)
Ending balance	$ 105,195		107,691	105,195	236,165
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment				(75,399)
Accumulated amortization, beginning balance			(24,764)	(57,718)
Accumulated amortization, impairment				41,731
Accumulated amortization			(9,166)	(9,848)	(9,753)
Accumulated amortization, ending balance	(24,764)		(35,715)	(24,764)	(57,718)
Net intangibles, impairment				(33,668)
Indefinite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment				(75,399)
Total intangibles	133,434		142,048	133,434	214,022
Intangible assets, net	108,670		106,333	108,670	156,304
Intangible assets, gross, translation			8,614	(5,189)
Intangible assets, accumulated amortization, translation			(1,785)	1,071
Net intangible, translation			6,829	(4,118)
Tradename
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment			0	(3,530)	0
Indefinite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment			0	(3,530)	0
Airlaid Materials
Goodwill
Beginning balance			105,195	109,486
Impairment				0
Purchase price allocation adjustment				0
Translation			2,496	(4,291)
Ending balance	105,195		107,691	105,195	109,486
Airlaid Materials | Tradename
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			3,442	4,485
Total intangibles, translation			124	(1,043)
Total intangibles, ending balance	3,442		3,566	3,442	4,485
Accumulated amortization, beginning balance			(739)	(603)
Accumulated amortization			(174)	(170)
Accumulated amortization, translation			(31)	34
Accumulated amortization, ending balance	(739)		(944)	(739)	(603)
Net intangibles, beginning balance			2,703	3,882
Net intangibles, translation			93	(1,009)
Net intangibles, ending balance	2,703		2,622	2,703	3,882
Airlaid Materials | Technology and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			17,512	17,825
Total intangibles, translation			609	(313)
Total intangibles, ending balance	17,512		18,121	17,512	17,825
Accumulated amortization, beginning balance			(5,437)	(4,552)
Accumulated amortization			(1,160)	(1,131)
Accumulated amortization, translation			(222)	246
Accumulated amortization, ending balance	(5,437)		(6,819)	(5,437)	(4,552)
Net intangibles, beginning balance			12,075	13,273
Net intangibles, translation			387	(67)
Net intangibles, ending balance	12,075		11,302	12,075	13,273
Airlaid Materials | Customer relationships and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			43,152	44,585
Total intangibles, translation			834	(1,433)
Total intangibles, ending balance	43,152		43,986	43,152	44,585
Accumulated amortization, beginning balance			(13,571)	(10,512)
Accumulated amortization			(3,706)	(3,657)
Accumulated amortization, translation			(408)	598
Accumulated amortization, ending balance	(13,571)		(17,685)	(13,571)	(10,512)
Net intangibles, beginning balance			29,581	34,073
Net intangibles, translation			426	(835)
Net intangibles, ending balance	29,581		26,301	29,581	34,073
Composite Fibers
Goodwill
Beginning balance			0	78,438
Impairment	(20,300)			(76,411)
Purchase price allocation adjustment				0
Translation			0	(2,027)
Ending balance	0		0	0	78,438
Composite Fibers | Tradename
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment				(3,530)
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite intangibles, beginning balance				3,601
Total intangibles, impairment				(3,530)
Total intangibles, translation				(71)
Indefinite intangibles, ending balance					3,601
Composite Fibers | Technology and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance				38,614
Total intangibles, impairment				(37,823)
Total intangibles, translation				(791)
Total intangibles, ending balance					38,614
Accumulated amortization, beginning balance				(19,224)
Accumulated amortization, impairment				19,380
Accumulated amortization				(424)
Accumulated amortization, translation				268
Accumulated amortization, ending balance					(19,224)
Net intangibles, beginning balance				19,390
Net intangibles, impairment				(18,443)
Net intangibles, translation				(523)
Net intangibles, ending balance					19,390
Indefinite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment				(37,823)
Composite Fibers | Customer relationships and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance				34,739
Total intangibles, impairment				(34,046)
Total intangibles, translation				(693)
Total intangibles, ending balance					34,739
Accumulated amortization, beginning balance				(22,104)
Accumulated amortization, impairment				22,351
Accumulated amortization				(587)
Accumulated amortization, translation				340
Accumulated amortization, ending balance					(22,104)
Net intangibles, beginning balance				12,635
Net intangibles, impairment				(11,695)
Net intangibles, translation				(353)
Net intangibles, ending balance					12,635
Indefinite-lived Intangible Assets [Roll Forward]
Total intangibles, impairment				(34,046)
Spunlace
Goodwill
Beginning balance			0	48,241
Impairment				(42,541)
Purchase price allocation adjustment			0	(500)
Translation			0	(5,200)
Ending balance	0		0	0	48,241
Spunlace | Tradename
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			27,290	27,623
Total intangibles, translation			2,774	(333)
Total intangibles, ending balance	27,290		30,064	27,290	27,623
Accumulated amortization, beginning balance			(1,759)	(253)
Accumulated amortization			(1,323)	(1,241)
Accumulated amortization, translation			(370)	(265)
Accumulated amortization, ending balance	(1,759)		(3,452)	(1,759)	(253)
Net intangibles, beginning balance			25,531	27,370
Net intangibles, translation			2,404	(598)
Net intangibles, ending balance	25,531		26,612	25,531	27,370
Spunlace | Technology and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			14,372	14,547
Total intangibles, translation			1,461	(175)
Total intangibles, ending balance	14,372		15,833	14,372	14,547
Accumulated amortization, beginning balance			(1,455)	(202)
Accumulated amortization			(1,223)	(1,151)
Accumulated amortization, translation			(468)	(102)
Accumulated amortization, ending balance	(1,455)		(3,146)	(1,455)	(202)
Net intangibles, beginning balance			12,917	14,345
Net intangibles, translation			993	(277)
Net intangibles, ending balance	12,917		12,687	12,917	14,345
Spunlace | Customer relationships and related
Finite-lived Intangible Assets [Roll Forward]
Total intangibles, beginning balance			27,666	28,003
Total intangibles, translation			2,812	(337)
Total intangibles, ending balance	27,666		30,478	27,666	28,003
Accumulated amortization, beginning balance			(1,803)	(268)
Accumulated amortization			(1,580)	(1,487)
Accumulated amortization, translation			(286)	(48)
Accumulated amortization, ending balance	(1,803)		(3,669)	(1,803)	(268)
Net intangibles, beginning balance			25,863	27,735
Net intangibles, translation			2,526	(385)
Net intangibles, ending balance	$ 25,863		$ 26,809	$ 25,863	$ 27,735

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense:	$ 9,166	$ 9,848	$ 9,753
2024	9,408
2025	9,408
2026	9,408
2027	9,408
2028	$ 9,408

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details)	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Remaining useful life	13 years 1 month 6 days
Tradename | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years
Tradename | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years
Technical know-how | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	8 years
Technical know-how | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years
Customer relationships and related | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	11 years
Customer relationships and related | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	18 years

Other Long-Term Assets (Details

Other Long-Term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Assets, Noncurrent [Abstract]
Right-of-use asset operating leases	$ 24,991	$ 25,420
Deferred taxes	18,590	9,321
Jacob Holm acquisition tax indemnification asset	17,229	17,229
Fox River escrow	9,009	8,777
Restricted cash - 401(K)	794	4,902
Other	10,276	12,544
Total	$ 80,889	$ 78,193

Other Current Liabilities - Sum

Other Current Liabilities - Summary of Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Accrued payroll and benefits	$ 28,802	$ 32,863
Accrued tornado costs	29,000	0
Income taxes payable	9,285	6,179
Accrued rebates	$ 7,100	$ 4,328
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Operating lease liability	$ 5,063	$ 4,488
Accrued energy costs	4,409	3,844
Accrued interest	3,626	4,147
Other accrued expenses	25,473	32,875
Total	$ 112,758	$ 88,724

Other Current Liabilities - Nar

Other Current Liabilities - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Other Liabilities Disclosure [Abstract]
Contractual obligation	$ 29
Insurance recovery receivable	27
Insurance deductible amount	$ 5

Leases - Summary of Information

Leases - Summary of Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Right-of-use asset operating leases	$ 24,991	$ 25,420
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Weighted average discount rate	3.63%	3.14%
Weighted average remaining maturity (years)	20 years	21 years

Leases - Summary of Operating L

Leases - Summary of Operating Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease expense	$ 6,685	$ 5,867

Leases - Summary of Minimum Lea

Leases - Summary of Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 5,671
2025	4,693
2026	2,775
2027	2,295
2028	1,694
Thereafter	$ 18,542

Long-Term Debt - Summary of Lon

Long-Term Debt - Summary of Long-term Debt (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Oct. 29, 2021	Oct. 25, 2021
Debt Instrument [Line Items]
Total long-term debt	$ 871,670,000	$ 844,232,000
Less current portion	(1,005,000)	(40,435,000)
Unamortized deferred issuance costs	(17,502,000)	(10,545,000)
Long-term debt, net of current portion	853,163,000	793,252,000
4.750% Senior Notes, due Oct. 2029
Debt Instrument [Line Items]
Total long-term debt	$ 500,000,000	500,000,000		$ 500,000,000
Interest rate on debt (as a percent)	4.75%			4.75%
4.750% Senior Notes, due Oct. 2029 | Jacob Holm | Senior Notes
Debt Instrument [Line Items]
Total long-term debt			$ 500,000,000
11.25% Term loan, due Mar 2029
Debt Instrument [Line Items]
Total long-term debt	$ 271,215,000	0
Interest rate on debt (as a percent)	11.25%
Term loan, due Feb 2024
Debt Instrument [Line Items]
Total long-term debt	$ 0	193,588,000
2.05% Term Loan, due Mar 2023
Debt Instrument [Line Items]
Total long-term debt	$ 0	1,423,000
Interest rate on debt (as a percent)	2.05%
1.30% Term Loan, due Jun 2023
Debt Instrument [Line Items]
Total long-term debt	$ 0	762,000
Interest rate on debt (as a percent)	1.30%
1.55% Term Loan, due Sep 2025
Debt Instrument [Line Items]
Total long-term debt	$ 0	3,594,000
Interest rate on debt (as a percent)	1.55%
1.10% Term Loan, due Mar 2024
Debt Instrument [Line Items]
Total long-term debt	$ 1,005,000	4,848,000
Interest rate on debt (as a percent)	1.10%
0.57% Term Loan, due Jul 2023
Debt Instrument [Line Items]
Total long-term debt	$ 0	21,332,000
Interest rate on debt (as a percent)	0.57%
Revolving credit facility, due Sep. 2026
Debt Instrument [Line Items]
Total long-term debt	$ 99,450,000	$ 118,685,000

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details)			12 Months Ended
	Mar. 30, 2023 USD ($)	Feb. 28, 2023 EUR (€) loan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) loan	Mar. 30, 2023 EUR (€)	Oct. 25, 2021 USD ($)	Sep. 02, 2021 USD ($)	Sep. 02, 2021 EUR (€)
Debt Instrument [Line Items]
Carrying Value			$ 871,670,000	$ 844,232,000
Number of loans | loan					2
Number of loans extinguished | loan		1
Extinguished debt amount | €		€ 20,000,000
Unamortized deferred issuance costs			(17,500,000)
Amortization of debt issuance costs			3,000,000	1,900,000	$ 900,000
Letters of credit outstanding			0
Term Loan | Angelo Gordon | Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €						€ 250,000,000
Interest rate on debt (as a percent)	11.25%					11.25%
Term loan, due Feb 2024
Debt Instrument [Line Items]
Carrying Value			$ 0	193,588,000
Term loan, due Feb 2024 | Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €						€ 220,000,000
4.750% Senior Notes, due Oct. 2029
Debt Instrument [Line Items]
Interest rate on debt (as a percent)			4.75%				4.75%
Carrying Value			$ 500,000,000	500,000,000			$ 500,000,000
1.10% Term Loan, due Mar 2024
Debt Instrument [Line Items]
Carrying Value			$ 1,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000							$ 400,000,000
Increases in borrowing margin (as a percent)	2.75%
Debt instrument covenant compliance leverage ratio, actual			3.4
Debt instrument covenant compliance debt service ratio			1.7
Revolving Credit Facility | Overnight Banking Funding Rate
Debt Instrument [Line Items]
Federal fund rate spread			0.50%
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Federal fund rate spread			3.50%
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Federal fund rate spread			5%
Revolving Credit Facility | EURIBOR | Minimum
Debt Instrument [Line Items]
Federal fund rate spread			3.50%
Revolving Credit Facility | EURIBOR | Maximum
Debt Instrument [Line Items]
Federal fund rate spread			5%
Revolving Credit Facility | Simple Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Federal fund rate spread			1%
Revolving Credit Facility | Simple Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Federal fund rate spread			2.50%
Revolving Credit Facility | Simple Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Federal fund rate spread			4%
Revolving Credit Facility | Through The Period Ended December 31, 2024
Debt Instrument [Line Items]
Net debt to EBITDA ratio, maximum	4.25					4.25
Revolving Credit Facility | At March 31, 2025
Debt Instrument [Line Items]
Net debt to EBITDA ratio, maximum	4					4
Revolving Credit Facility | At March 31, 2026
Debt Instrument [Line Items]
Net debt to EBITDA ratio, maximum	3.50					3.50
Term Loan Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €						€ 220,000,000			€ 220,000,000
Interest rate on debt (as a percent)								1.25%	1.25%
Letters of Credit
Debt Instrument [Line Items]
Carrying Value			$ 5,700,000	$ 4,700,000

Long-Term Debt - Amortization o

Long-Term Debt - Amortization of Term Loan Agreements Together with Maturities of Other Long-term Debt (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Disclosure [Abstract]
2024	$ 1,005
2025	0
2026	99,450
2027	0
2028	0
Thereafter	$ 776,250

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Oct. 25, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 871,670,000	$ 844,232,000
Fair Value	729,279,000	640,188,000
Revolving credit facility, due Sep. 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	99,450,000	118,685,000
Fair Value	$ 99,450,000	118,685,000
4.750% Senior Notes, due Oct. 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	4.75%		4.75%
Carrying Value	$ 500,000,000	500,000,000	$ 500,000,000
Fair Value	$ 346,250,000	301,250,000
11.25% Term loan, due Mar 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	11.25%
Carrying Value	$ 271,215,000	0
Fair Value	282,586,000	188,998,000
Term loan, due Feb 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	0	193,588,000
Fair Value	$ 0	0
2.05% Term Loan, due Mar 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	2.05%
Carrying Value	$ 0	1,423,000
Fair Value	$ 0	1,418,000
1.30% Term Loan, due Jun 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	1.30%
Carrying Value	$ 0	762,000
Fair Value	$ 0	754,000
1.55% Term Loan, due Sep 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	1.55%
Carrying Value	$ 0	3,594,000
Fair Value	$ 0	3,430,000
1.10% Term Loan, due Mar 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	1.10%
Carrying Value	$ 1,005,000	4,848,000
Fair Value	$ 993,000	4,721,000
0.57% Term Loan, due Jul 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt (as a percent)	0.57%
Carrying Value	$ 0	21,332,000
Fair Value	$ 0	$ 20,932,000

Financial Derivatives and Hed_3

Financial Derivatives and Hedging Activities - Additional Information (Details)			12 Months Ended
	Sep. 06, 2022 USD ($)	Jun. 15, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 EUR (€)	Jun. 15, 2022 EUR (€)
Derivative [Line Items]
Pre-tax (loss) gain from changes in currency exchange rates			$ (3,700,000)	$ 10,800,000
Term Loans
Derivative [Line Items]
Line of credit facility, maximum borrowing capacity | €					€ 220,000,000
Floating-to-fixed Interest Rate Swap Agreement
Derivative [Line Items]
Derivative notional amount | €						€ 180,000,000
Derivative fixed interest rate						0.0395%
Loans variable rate of interest | €						€ 180,000,000
Deferred gain on derivative		$ 400,000
Designated as Hedging | Currency Swap
Derivative [Line Items]
Derivative notional amount	$ 150,000,000
Derivative fixed interest rate	3.06%
Derivative, interest rate swap (as a percent)	4.75%
Proceeds from termination of cross-currency swap	$ 15,200,000
Not Designated as Hedging
Derivative [Line Items]
Maturities of foreign currency derivative contracts			1 month
Minimum
Derivative [Line Items]
Long-term debt percentage bearing fixed Interest rate						0%
Minimum | Foreign Exchange | Gains on cash flow hedges
Derivative [Line Items]
Accumulated other comprehensive income realization period			12 months
Minimum | Cash Flow Hedges | Designated as Hedging
Derivative [Line Items]
Maturities of foreign currency derivative contracts			1 month
Maximum | Foreign Exchange | Gains on cash flow hedges
Derivative [Line Items]
Accumulated other comprehensive income realization period			18 months
Maximum | Cash Flow Hedges | Designated as Hedging
Derivative [Line Items]
Maturities of foreign currency derivative contracts			15 months

Financial Derivatives and Hed_4

Financial Derivatives and Hedging Activities - Summary of Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Details) ₱ in Thousands, € in Thousands, ¥ in Thousands, £ in Thousands, SFr in Thousands, $ in Thousands

Dec. 31, 2023 EUR (€)

Dec. 31, 2023 PHP (₱)

Dec. 31, 2023 USD ($)

Dec. 31, 2023 GBP (£)

Dec. 31, 2023 CHF (SFr)

Dec. 31, 2023 CNY (¥)

Dec. 31, 2022 EUR (€)

Dec. 31, 2022 PHP (₱)

Dec. 31, 2022 USD ($)

Dec. 31, 2022 GBP (£)

Dec. 31, 2022 CHF (SFr)

Dec. 31, 2022 CNY (¥)

Not Designated as Hedging | U.S. Dollar / British Pound | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

$ 22,800

$ 28,600

Not Designated as Hedging | Euro / U.S. Dollar | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

€ 11,000

€ 9,630

Not Designated as Hedging | Euro / U.S. Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

10,200

2,900

Not Designated as Hedging | U.S. Dollar / Canadian Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

1,120

0

Not Designated as Hedging | British Pound / Euro | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | £

£ 3,500

£ 2,800

Not Designated as Hedging | British Pound / Euro | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | £

6,470

15,950

Not Designated as Hedging | U.S. Dollar / Swiss Franc | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

13,620

0

Not Designated as Hedging | British Pound / Swiss Franc | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | £

2,240

2,535

Not Designated as Hedging | Euro / Swiss Franc | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

4,940

0

Not Designated as Hedging | U.S Dollar / Philipine Peso | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

6,700

0

Not Designated as Hedging | Swiss Franc / Euro | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | SFr

SFr 0

SFr 2,250

Not Designated as Hedging | Swiss Franc / U.S. Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | SFr

SFr 0

SFr 930

Not Designated as Hedging | Chinese Yuan / U.S. Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | ¥

¥ 0

¥ 4,400

Cash Flow Hedges | Designated as Hedging | Euro / British Pound | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

15,210

18,961

Cash Flow Hedges | Designated as Hedging | Philippine Peso / Euro | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | ₱

₱ 137,449

₱ 0

Cash Flow Hedges | Designated as Hedging | U.S. Dollar / British Pound | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

18,470

34,501

Cash Flow Hedges | Designated as Hedging | U.S. Dollar / Euro | Sell Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

277

824

Cash Flow Hedges | Designated as Hedging | Euro / Philippine Peso | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

788,342

1,030,114

Cash Flow Hedges | Designated as Hedging | British Pound / Philippine Peso | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | £

£ 923,653

£ 1,144,839

Cash Flow Hedges | Designated as Hedging | Euro / U.S. Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount | €

€ 93,397

€ 78,435

Cash Flow Hedges | Designated as Hedging | U.S. Dollar / Canadian Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

30,914

36,423

Cash Flow Hedges | Designated as Hedging | British Pound / U.S. Dollar | Buy Notional

Derivative Instruments And Hedging Activities Disclosures [Line Items]

Derivative notional amount

$ 2,211

$ 0

Financial Derivatives and Hed_5

Financial Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments (Details) - Forward Foreign Currency Exchange Contracts - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Prepaid Expenses and Other Current Assets | Designated as Hedging
Derivatives Fair Value [Line Items]
Derivative asset, fair value	$ 851	$ 1,795
Prepaid Expenses and Other Current Assets | Designated as Hedging | Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative asset, fair value	0	0
Prepaid Expenses and Other Current Assets | Not Designated as Hedging
Derivatives Fair Value [Line Items]
Derivative asset, fair value	937	797
Other Current Liabilities | Designated as Hedging
Derivatives Fair Value [Line Items]
Derivative liability, fair value	1,653	2,368
Other Current Liabilities | Designated as Hedging | Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative liability, fair value	0	0
Other Current Liabilities | Not Designated as Hedging
Derivatives Fair Value [Line Items]
Derivative liability, fair value	$ 155	$ 317

Financial Derivatives and Hed_6

Financial Derivatives and Hedging Activities - Summary of Income or Loss from Derivative Instruments Recognized in Results of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other, net	Other, net	Other, net
Forward Foreign Currency Exchange Contracts | Not Designated as Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ (1,378)	$ 1,240	$ 2,666
Forward Foreign Currency Exchange Contracts | Cost of products sold | Designated as Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	(1,785)	(7,896)	(382)
Forward Foreign Currency Exchange Contracts | Interest expense | Designated as Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ 0	$ (335)	$ 85

Financial Derivatives and Hed_7

Financial Derivatives and Hedging Activities - Summary of Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Amounts Of Derivative Assets Recorded As A Component Of AOCI [Roll Forward]
Beginning balance	$ 318,004	$ 542,762
Ending balance	256,854	318,004
Gains on cash flow hedges
Fair Value Amounts Of Derivative Assets Recorded As A Component Of AOCI [Roll Forward]
Beginning balance	11,176	1,988
Ending balance	10,555	11,176
Gains on cash flow hedges | Fair Value, Inputs, Level 2 | Foreign Exchange
Fair Value Amounts Of Derivative Assets Recorded As A Component Of AOCI [Roll Forward]
Beginning balance	242	2,889
Deferred gains on cash flow hedges	735	5,584
Reclassified to earnings	(1,785)	(8,231)
Ending balance	$ (808)	$ 242

Shareholders' Equity (Details)

Shareholders' Equity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of year (in shares)	44,794	44,549	44,368
Treasury shares issued for:
Restricted stock awards and performance share awards (in shares)	293	245	181
Shares outstanding at end of year (in shares)	45,087	44,794	44,549

Commitments, Contingencies an_3

Commitments, Contingencies and Legal Proceedings - Summary of Minimum Annual Payment Due on Noncancelable Operating Lease (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases
2024	$ 5,671
2025	4,693
2026	2,775
2027	2,295
2028	1,694
Thereafter	18,542
Other
2024	14,446
2025	0
2026	0
2027	0
2028	0
Thereafter	$ 0

Commitments, Contingencies an_4

Commitments, Contingencies and Legal Proceedings - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) mi operable_unit	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Annual payments due under operating leases	$ 35,700
Other obligations	$ 14,400
Number of miles for river clean-up | mi	39
Number of operable units | operable_unit	5
Agreement term for environmental remediation (in years)	30 years
Total amount available in escrow account	$ 9,000
Difference recorded in escrow account	900
Reserve for environmental liabilities, current portion	$ 2,000	$ 2,200
Environmental Loss Contingency Noncurrent Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Environmental liabilities
Accrual for environmental loss contingencies, noncurrent	$ 11,700
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	Other long-term liabilities

Commitments, Contingencies an_5

Commitments, Contingencies and Legal Proceedings - Summary of Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reserve For Government Oversight Costs And Maintenance [Roll Forward]
Beginning balance	$ 14,547	$ 16,200
Payments	(1,049)	(1,848)
Accretion	199	195
Ending balance	$ 13,697	$ 14,547

Segment and Geographic Inform_3

Segment and Geographic Information - Summary of Financial and Other Information by Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) T	Dec. 31, 2022 USD ($) T	Dec. 31, 2021 USD ($) T
Segment Reporting Information [Line Items]
Net Sales	$ 1,385,516	$ 1,491,326	$ 1,084,694
Operating income (loss)	2,712	(163,951)	28,614
Depreciation and amortization	63,247	66,724	61,421
Capital expenditures	$ 33,770	$ 37,740	$ 30,037
Tons shipped (metric) | T	311,544	340,661	292,844
Plant, equipment and timberlands, net	$ 662,916	$ 675,811	$ 758,812
Inter-segment sales elimination
Segment Reporting Information [Line Items]
Net Sales	$ (2,397)	$ 0	$ 0
Tons shipped (metric) | T	(1,258)	0	0
Other and unallocated
Segment Reporting Information [Line Items]
Operating income (loss)	$ (59,774)	$ (226,394)	$ (49,714)
Depreciation and amortization	3,873	5,128	3,937
Capital expenditures	2,552	5,630	5,884
Plant, equipment and timberlands, net	21,144	23,062	23,565
Airlaid Materials | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	586,480	601,514	470,250
Operating income (loss)	43,207	54,809	42,244
Depreciation and amortization	30,464	30,114	28,101
Capital expenditures	$ 9,885	$ 9,691	$ 8,431
Tons shipped (metric) | T	156,442	164,844	148,134
Plant, equipment and timberlands, net	$ 335,456	$ 347,142	$ 371,324
Composite Fibers | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	483,517	523,863	556,807
Operating income (loss)	21,347	16,923	37,422
Depreciation and amortization	15,665	19,632	27,690
Capital expenditures	$ 12,286	$ 15,730	$ 11,912
Tons shipped (metric) | T	94,742	103,092	132,196
Plant, equipment and timberlands, net	$ 146,022	$ 145,959	$ 202,445
Spunlace | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	317,916	365,949	57,637
Operating income (loss)	(2,068)	(9,289)	(1,338)
Depreciation and amortization	13,245	11,850	1,693
Capital expenditures	$ 9,047	$ 6,689	$ 3,810
Tons shipped (metric) | T	61,618	72,725	12,514
Plant, equipment and timberlands, net	$ 160,294	$ 159,648	$ 161,478

Segment and Geographic Inform_4

Segment and Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Procter & Gamble Company | Sales Revenue, Net | Customer Concentration Risk
Segment Reporting Revenue Reconciling Item [Line Items]
Concentration risk, percentage	16%	15%	16%

Segment and Geographic Inform_5

Segment and Geographic Information - Summary of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 1,385,516	$ 1,491,326	$ 1,084,694
Plant, equipment and timberlands, net	662,916	675,811	758,812
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	497,370	508,679	255,086
Plant, equipment and timberlands, net	304,895	317,191	326,668
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	531,241	537,363	513,043
Plant, equipment and timberlands, net	197,267	194,586	251,375
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	79,640	74,487	82,144
Plant, equipment and timberlands, net	42,198	43,015	50,420
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	133,793	146,393	120,808
Plant, equipment and timberlands, net	57,408	61,516	65,291
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	143,472	224,404	113,613
Plant, equipment and timberlands, net	$ 61,148	$ 59,503	$ 65,057

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event $ in Millions		7 Months Ended
	Feb. 06, 2024 USD ($)	Dec. 31, 2024 member
Executive Officers and Other Key Employees
Subsequent Event [Line Items]
Accrued bonuses | $	$ 6
Cash retention bonus term	6 months
Forecast
Subsequent Event [Line Items]
Ownership percentage of shares outstanding		10%
Number of members of the board of directors		3
Berry Global Group, Inc. | Forecast
Subsequent Event [Line Items]
Ownership percentage of shares outstanding		90%
Number of members of the board of directors		6

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of year	$ 5,025	$ 2,731	$ 2,093
Provision	132	3,044	469
Write-offs, recoveries and discounts allowed	(2,703)	(102)	(10)
Other	184	(648)	179
Balance, end of year	2,638	5,025	2,731
Sales Discounts and Deductions
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, beginning of year	1,914	825	791
Provision	5,633	3,077	1,649
Write-offs, recoveries and discounts allowed	(5,852)	(1,610)	(1,493)
Other	77	(377)	(122)
Balance, end of year	$ 1,772	$ 1,914	$ 825