$MAGN
Stock $magn

$magn Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000004171924000007 Filed on February 28, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$327.3M	$320.4M	$1.386B
YoY Change	-13.47%	-14.31%	-7.1%
Cost Of Revenue	$292.7M	$289.5M	$1.256B
YoY Change	-14.4%	-12.68%	-6.46%
Gross Profit	$34.51M	$30.87M	$129.7M
YoY Change	-4.71%	-27.11%	-12.83%
Gross Profit Margin	10.55%	9.64%	9.36%
Selling, General & Admin	$36.06M	$25.64M	$109.7M
YoY Change	17.28%	-25.77%	-12.21%
% of Gross Profit	104.48%	83.06%	84.61%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.75M	$15.85M	$63.25M
YoY Change	0.15%	-2.4%	-5.21%
% of Gross Profit	45.65%	51.35%	48.76%
Operating Expenses	$36.06M	$25.64M	$109.7M
YoY Change	17.28%	-25.77%	-12.21%
Operating Profit	-$1.545M	$5.230M	$2.712M
YoY Change	-125.27%	-33.04%	-101.65%
Interest Expense	$17.69M	-$17.17M	$64.74M
YoY Change	40.42%	85.17%	94.96%
% of Operating Profit		-328.32%	2387.13%
Other Income/Expense, Net	-$19.45M	-$2.280M	-$73.80M
YoY Change	24.68%	-37.14%	82.5%
Pretax Income	-$21.00M	-$15.02M	-$71.09M
YoY Change	121.05%	-58.07%	-65.22%
Income Tax	$5.200M	-$6.616M	$7.011M
% Of Pretax Income
Net Earnings	-$26.35M	-$8.666M	-$79.05M
YoY Change	93.96%	-74.76%	-59.29%
Net Earnings / Revenue	-8.05%	-2.7%	-5.71%
Basic Earnings Per Share	-$0.58		-$1.75
Diluted Earnings Per Share	-$0.58	-$0.19	-$1.75
COMMON SHARES
Basic Shares Outstanding	45.15M shares	45.09M shares	45.06M shares
Diluted Shares Outstanding	45.18M shares		45.06M shares

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$30.18M	$50.27M	$50.27M
YoY Change	-65.95%	-54.58%	-54.58%
Cash & Equivalents	$30.18M	$50.27M	$50.27M
Short-Term Investments
Other Short-Term Assets	$73.93M	$86.48M	$86.48M
YoY Change	2.31%	35.71%	35.71%
Inventory	$299.7M	$298.2M	$298.2M
Prepaid Expenses
Receivables	$180.5M	$171.0M	$171.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$584.3M	$606.0M	$606.0M
YoY Change	-13.97%	-10.82%	-10.82%
LONG-TERM ASSETS
Property, Plant & Equipment	$648.9M	$662.9M	$687.9M
YoY Change	-4.05%	-1.91%	-1.9%
Goodwill	$106.1M	$107.7M
YoY Change	-0.39%	2.37%
Intangibles	$98.66M	$106.3M
YoY Change	-8.06%	-2.15%
Long-Term Investments
YoY Change
Other Assets	$79.19M	$80.89M	$55.90M
YoY Change	-3.45%	3.45%	5.92%
Total Long-Term Assets	$932.9M	$957.8M	$957.8M
YoY Change	-4.04%	-1.04%	-1.04%
TOTAL ASSETS
Total Short-Term Assets	$584.3M	$606.0M	$606.0M
Total Long-Term Assets	$932.9M	$957.8M	$957.8M
Total Assets	$1.517B	$1.564B	$1.564B
YoY Change	-8.13%	-5.07%	-5.07%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$134.2M	$158.5M	$158.5M
YoY Change	-31.66%	-27.19%	-27.19%
Accrued Expenses		$103.5M	$103.5M
YoY Change			25.35%
Deferred Revenue
YoY Change
Short-Term Debt	$7.452M	$6.150M	$6.150M
YoY Change	-9.19%	-46.16%	-46.16%
Long-Term Debt Due	$0.00	$1.005M	$1.005M
YoY Change	-100.0%	-97.51%	-97.51%
Total Short-Term Liabilities	$252.6M	$280.4M	$280.4M
YoY Change	-17.96%	-22.21%	-22.21%
LONG-TERM LIABILITIES
Long-Term Debt	$868.2M	$853.2M	$853.2M
YoY Change	1.89%	7.55%	7.55%
Other Long-Term Liabilities	$121.7M	$121.2M	$121.2M
YoY Change	-1.78%	-0.09%	-0.09%
Total Long-Term Liabilities	$989.9M	$974.4M	$974.4M
YoY Change	1.42%	6.54%	6.54%
TOTAL LIABILITIES
Total Short-Term Liabilities	$252.6M	$280.4M	$280.4M
Total Long-Term Liabilities	$989.9M	$974.4M	$974.4M
Total Liabilities	$1.294B	$1.307B	$1.307B
YoY Change	-3.36%	-1.69%	-1.69%
SHAREHOLDERS EQUITY
Retained Earnings	$393.5M	$419.8M
YoY Change	-18.92%	-15.85%
Common Stock	$57.33M	$59.30M
YoY Change	-4.14%	-3.11%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$223.3M	$256.9M	$256.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.517B	$1.564B	$1.564B
YoY Change	-8.13%	-5.07%	-5.07%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	-$26.35M	-$8.666M	-$79.05M
YoY Change	93.96%	-74.76%	-59.29%
Depreciation, Depletion And Amortization	$15.75M	$15.85M	$63.25M
YoY Change	0.15%	-2.4%	-5.21%
Cash From Operating Activities	-$33.63M	$15.90M	-$26.79M
YoY Change	9.78%	-31.38%	-34.38%
INVESTING ACTIVITIES
Capital Expenditures	$7.482M	$8.541M	$33.77M
YoY Change	-21.24%	11.56%	-10.52%
Acquisitions			$0.00
YoY Change			-100.0%
Other Investing Activities	$2.000K	$134.0K	-$844.0K
YoY Change		123.33%	2713.33%
Cash From Investing Activities	-$7.480M	-$8.407M	-$37.10M
YoY Change	-14.87%	10.68%	12.09%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net	$988.0K		$228.4M
YoY Change	-99.56%		547.3%
Cash From Financing Activities	$20.84M	-11.94M	-$949.0K
YoY Change	37.29%	131.09%	-102.02%
NET CHANGE
Cash From Operating Activities	-33.63M	15.90M	-26.79M
Cash From Investing Activities	-$7.480M	-8.407M	-$37.10M
Cash From Financing Activities	$20.84M	-11.94M	-$949.0K
Net Change In Cash	-$21.01M	-4.439M	-$62.63M
YoY Change	-8.56%	-142.62%	113.47%
FREE CASH FLOW
Cash From Operating Activities	-$33.63M	$15.90M	-$26.79M
Capital Expenditures	$7.482M	$8.541M	$33.77M
Free Cash Flow	-$41.11M	$7.363M	-$60.56M
YoY Change	2.44%	-52.56%	-22.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5069000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	831000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	-163951000	usd
CY2023	us-gaap	Interest Expense InterestExpense	64739000	usd
CY2021	us-gaap	Interest Expense InterestExpense	12353000	usd
CY2023	us-gaap	Investment Income Interest InvestmentIncomeInterest	1486000	usd
CY2022	us-gaap	Investment Income Interest InvestmentIncomeInterest	408000	usd
CY2021	us-gaap	Investment Income Interest InvestmentIncomeInterest	73000	usd
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2657000	usd
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-14937000	usd
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	44430000	usd
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	40019000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-165000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3234000	usd
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-62686000	usd
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0000041719
CY2023	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost Credit Settlement Gain Loss Statement Of Income Or Comprehensive Income Extensible List DefinedBenefitPlanNetPeriodicBenefitCostCreditSettlementGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleList	http://fasb.org/us-gaap/2023#OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
CY2022Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherLiabilitiesCurrent
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssetsNoncurrent
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#OtherAssetsNoncurrent
CY2022	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense
CY2023	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense
CY2021	us-gaap	Derivative Gain Loss Statement Of Income Or Comprehensive Income Extensible Enumeration DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration	http://fasb.org/us-gaap/2023#OtherNonoperatingIncomeExpense
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	4350 Congress Street
CY2023	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 600
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Charlotte
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	NC
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	28209
CY2023	dei	City Area Code CityAreaCode	704
CY2023	dei	Local Phone Number LocalPhoneNumber	885-2555
CY2023	dei	Entity File Number EntityFileNumber	1-03560
CY2023	dei	Entity Registrant Name EntityRegistrantName	Glatfelter Corporation
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	23-0628360
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	PA
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $.01 per share
CY2023	dei	Trading Symbol TradingSymbol	GLT
CY2023	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	112700000	usd
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	45147547	shares
CY2023	dei	Auditor Firm AuditorFirmId	34
CY2023	dei	Auditor Name AuditorName	DELOITTE & TOUCHE LLP
CY2023	dei	Auditor Location AuditorLocation	Charlotte, North Carolina
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1385516000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1491326000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1084694000	usd
CY2023	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1255809000	usd
CY2022	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1342524000	usd
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	939899000	usd
CY2023	us-gaap	Gross Profit GrossProfit	129707000	usd
CY2022	us-gaap	Gross Profit GrossProfit	148802000	usd
CY2021	us-gaap	Gross Profit GrossProfit	144795000	usd
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	109741000	usd
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	125001000	usd
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	121250000	usd
CY2023	glt	Goodwill And Other Asset Impairment Charges GoodwillAndOtherAssetImpairmentCharges	0	usd
CY2022	glt	Goodwill And Other Asset Impairment Charges GoodwillAndOtherAssetImpairmentCharges	190556000	usd
CY2021	glt	Goodwill And Other Asset Impairment Charges GoodwillAndOtherAssetImpairmentCharges	0	usd
CY2023	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-18365000	usd
CY2022	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	usd
CY2021	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1111000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2804000	usd
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5069000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	2712000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	28614000	usd
CY2022	us-gaap	Interest Expense InterestExpense	33207000	usd
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7642000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-79053000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.73
CY2022	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-4.33
CY2023	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.02
CY2022	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.75
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-4.33
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2023	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.73
CY2022	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-4.33
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.15
CY2023	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
CY2022	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.75
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-4.33
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45058000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44828000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44551000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45058000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44828000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44924000	shares
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-79053000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-194208000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	6937000	usd
CY2023	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	15509000	usd
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-36485000	usd
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-27232000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	429000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-2513000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-1866000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-621000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	9188000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	4484000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-41000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	898000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	111000	usd
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-498000	usd
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-9706000	usd
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-1097000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	15386000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17591000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-21651000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-63667000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-211799000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-14714000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	50265000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	110660000	usd
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2638000	usd
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5025000	usd
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	170974000	usd
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	195665000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	298248000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	309436000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	86480000	usd
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	63723000	usd
CY2023Q4	us-gaap	Assets Current AssetsCurrent	605967000	usd
CY2022Q4	us-gaap	Assets Current AssetsCurrent	679484000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	662916000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	675811000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	107691000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	105195000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	106333000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	108670000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	80889000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	78193000	usd
CY2023Q4	us-gaap	Assets Assets	1563796000	usd
CY2022Q4	us-gaap	Assets Assets	1647353000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1005000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	40435000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6150000	usd
CY2022Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	11422000	usd
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	158455000	usd
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	217625000	usd
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	2000000	usd
CY2022Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	2200000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	112758000	usd
CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	88724000	usd
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	280368000	usd
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	360406000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	853163000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	793252000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	52219000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	54388000	usd
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	121192000	usd
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	121303000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	1306942000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	1329349000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	usd
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	54361980	shares
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	54361980	shares
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	9275061	shares
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	9568457	shares
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	544000	usd
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	544000	usd
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	58759000	usd
CY2022Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	60663000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	419810000	usd
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	498863000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-82509000	usd
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-97895000	usd
CY2023Q4	us-gaap	Stockholders Equity Before Treasury Stock StockholdersEquityBeforeTreasuryStock	396604000	usd
CY2022Q4	us-gaap	Stockholders Equity Before Treasury Stock StockholdersEquityBeforeTreasuryStock	462175000	usd
CY2023Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	139750000	usd
CY2022Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	144171000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	256854000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	318004000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1563796000	usd
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1647353000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	-79053000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	-194208000	usd
CY2021	us-gaap	Profit Loss ProfitLoss	6937000	usd
CY2023	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-950000	usd
CY2022	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-91000	usd
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	216000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	63247000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	66724000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61421000	usd
CY2023	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5316000	usd
CY2022	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1915000	usd
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	865000	usd
CY2023	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-18365000	usd
CY2022	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	usd
CY2021	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	usd
CY2023	glt	Pension Settlement Charge PensionSettlementCharge	633000	usd
CY2023	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2022	us-gaap	Asset Impairment Charges AssetImpairmentCharges	190556000	usd
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2023	glt	Inventory And Accounts Receivable Charges Recovery InventoryAndAccountsReceivableChargesRecovery	-1441000	usd
CY2022	glt	Inventory And Accounts Receivable Charges Recovery InventoryAndAccountsReceivableChargesRecovery	3207000	usd
CY2021	glt	Inventory And Accounts Receivable Charges Recovery InventoryAndAccountsReceivableChargesRecovery	0	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-12176000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-24022000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-13619000	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1111000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2804000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	2797000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5063000	usd
CY2023	us-gaap	Inventory Write Down InventoryWriteDown	3262000	usd
CY2022	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2021	us-gaap	Inventory Write Down InventoryWriteDown	0	usd
CY2023	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-21634000	usd
CY2022	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	35294000	usd
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	14794000	usd
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-9605000	usd
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-5770000	usd
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	16398000	usd
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	65828000	usd
CY2023	glt	Increase Decrease In Accrued Expenses And Other Current Liabilities IncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities	5240000	usd
CY2022	glt	Increase Decrease In Accrued Expenses And Other Current Liabilities IncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities	-14342000	usd
CY2021	glt	Increase Decrease In Accrued Expenses And Other Current Liabilities IncreaseDecreaseInAccruedExpensesAndOtherCurrentLiabilities	-4165000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	363000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2208000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-2975000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-25616000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-40820000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	70977000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	33770000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	37740000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	30037000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1676000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3199000	usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5567000	usd
CY2023	glt	Payments Related To Sale Of Facility PaymentsRelatedToSaleOfFacility	5851000	usd
CY2022	glt	Payments Related To Sale Of Facility PaymentsRelatedToSaleOfFacility	0	usd
CY2021	glt	Payments Related To Sale Of Facility PaymentsRelatedToSaleOfFacility	0	usd
CY2023	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	usd
CY2022	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-1413000	usd
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	464856000	usd
CY2023	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-844000	usd
CY2022	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-30000	usd
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	440000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-37101000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-33098000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-489766000	usd
CY2023	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	usd
CY2022	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	usd
CY2021	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	500000000	usd
CY2023	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	262273000	usd
CY2022	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	46849000	usd
CY2023	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	228413000	usd
CY2022	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	35287000	usd
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	26088000	usd
CY2023	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-22884000	usd
CY2022	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	103519000	usd
CY2021	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-23481000	usd
CY2023	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	11645000	usd
CY2022	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1285000	usd
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	10132000	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	0	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18766000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24458000	usd
CY2023	glt	Proceeds From Government Grants ProceedsFromGovernmentGrants	0	usd
CY2022	glt	Proceeds From Government Grants ProceedsFromGovernmentGrants	0	usd
CY2021	glt	Proceeds From Government Grants ProceedsFromGovernmentGrants	479000	usd
CY2023	glt	Payments For Share Based Compensation And Other PaymentsForShareBasedCompensationAndOther	280000	usd
CY2022	glt	Payments For Share Based Compensation And Other PaymentsForShareBasedCompensationAndOther	1262000	usd
CY2021	glt	Payments For Share Based Compensation And Other PaymentsForShareBasedCompensationAndOther	817000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-949000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46919000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	462352000	usd
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1033000	usd
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2341000	usd
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-5418000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-62633000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-29340000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38145000	usd
CY2023	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-1169000	usd
CY2022	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-312000	usd
CY2021	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-996000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119162000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	148814000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	111665000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	55360000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	119162000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	148814000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	4300000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	3600000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2000000	usd
CY2023Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	795000	usd
CY2022Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	4902000	usd
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	8378000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value Including Discontinued Operations CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	50265000	usd
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value Including Discontinued Operations CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	110660000	usd
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value Including Discontinued Operations CashAndCashEquivalentsAtCarryingValueIncludingDiscontinuedOperations	138436000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	59182000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	33203000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	6957000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9424000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	24445000	usd
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	15500000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	577932000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	6937000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-21651000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-14714000	usd
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.56
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	24702000	usd
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5063000	usd
CY2021	glt	Adjustment To Stock Issued During Period Value Share Based Compensation Net AdjustmentToStockIssuedDuringPeriodValueShareBasedCompensationNet	-815000	usd
CY2021	glt	Adjustment To Stock Issued During Period Value Stock Options Exercised AdjustmentToStockIssuedDuringPeriodValueStockOptionsExercised	-2000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	542762000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-194208000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17591000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-211799000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.28
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	12529000	usd
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	831000	usd
CY2022	glt	Adjustment To Stock Issued During Period Value Share Based Compensation Net AdjustmentToStockIssuedDuringPeriodValueShareBasedCompensationNet	-1261000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	318004000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-79053000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15386000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-63667000	usd
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2797000	usd
CY2023	glt	Adjustment To Stock Issued During Period Value Share Based Compensation Net AdjustmentToStockIssuedDuringPeriodValueShareBasedCompensationNet	-280000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	256854000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1400000000	usd
CY2023Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	2980	employee
CY2023Q4	glt	Number Of Manufacturing Sites NumberOfManufacturingSites	15	manufacturing_site
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-top:6pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Reclassification of Prior Year Presentation</span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> Certain prior year amounts in the footnotes to the consolidated financial statements have been reclassified to conform to the current year presentation.</span></div>
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:6pt;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Accounting Estimates </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">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.</span></div>
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	operating_segment
CY2021	glt	Employee Retention Credit Percentage EmployeeRetentionCreditPercentage	0.70
CY2022	glt	Employee Retention Credit EmployeeRetentionCredit	8600000	usd
CY2023	glt	Employee Retention Credit EmployeeRetentionCredit	100000	usd
CY2022	glt	Employee Retention Credit EmployeeRetentionCredit	8600000	usd
CY2023	us-gaap	Disposal Group Including Discontinued Operation General And Administrative Expense DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	1000000.0	usd
CY2022	us-gaap	Disposal Group Including Discontinued Operation General And Administrative Expense DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	100000	usd
CY2021	glt	Disposal Group Including Discontinue Operation Credit To General And Administrative Expense For Reversal During Period DisposalGroupIncludingDiscontinueOperationCreditToGeneralAndAdministrativeExpenseForReversalDuringPeriod	200000	usd
CY2023	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-1200000	usd
CY2022	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-300000	usd
CY2021	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-1000000	usd
CY2023	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2022Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	42500000	usd
CY2023	glt	Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag ImpairmentLongLivedAssetHeldForUseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	Plant, property and equipment
CY2023	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	usd
CY2022	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	37936000	usd
CY2021	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	usd
CY2023	glt	Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag ImpairmentOfIntangibleAssetFiniteLivedStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	Technological know-how
CY2023	glt	Impairment Of Intangible Asset Indefinite Lived Excluding Goodwill Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag ImpairmentOfIntangibleAssetIndefiniteLivedExcludingGoodwillStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag	Tradename
CY2023	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	118952000	usd
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2023	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2022	us-gaap	Asset Impairment Charges AssetImpairmentCharges	190556000	usd
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	usd
CY2022Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	300000	usd
CY2023	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-1400000	usd
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1676000	usd
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1111000	usd
CY2022	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	3199000	usd
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	2804000	usd
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	5567000	usd
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	5069000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1385516000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1491326000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1084694000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1385516000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1491326000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1084694000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-79053000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-194208000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	6937000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45058000	shares
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44828000	shares
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44551000	shares
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	373000	shares
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45058000	shares
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44828000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44924000	shares
CY2023	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.73
CY2022	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-4.33
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.15
CY2023	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
CY2022	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	532000	shares
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	770000	shares
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1079000	shares
CY2023	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	16054000	usd
CY2023	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	668000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	15386000	usd
CY2022	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-10789000	usd
CY2022	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	6802000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17591000	usd
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-21941000	usd
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-290000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-21651000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-204392000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13677000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2864000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-801000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-570000	usd
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	974000	usd
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	239000	usd
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	584000	usd
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	15349000	usd
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	14309000	usd
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	20561000	usd
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	19187000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13747000	usd
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	20575000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-258000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-33000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1159000	usd
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1233000	usd
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	477000	usd
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	234000	usd
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-10685000	usd
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-24466000	usd
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-12694000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-12176000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-24022000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-13619000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7011000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-10275000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6956000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-60092000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-63421000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-44682000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-11000000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-140971000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	58359000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-71092000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2023	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.023
CY2022	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.027
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.046
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.019
CY2023	glt	Effective Income Tax Rate Reconciliation Tax Credits And Adjustments EffectiveIncomeTaxRateReconciliationTaxCreditsAndAdjustments	-0.010
CY2022	glt	Effective Income Tax Rate Reconciliation Tax Credits And Adjustments EffectiveIncomeTaxRateReconciliationTaxCreditsAndAdjustments	-0.001
CY2021	glt	Effective Income Tax Rate Reconciliation Tax Credits And Adjustments EffectiveIncomeTaxRateReconciliationTaxCreditsAndAdjustments	0.001
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.062
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.014
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0.236
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.013
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.001
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.153
CY2023	glt	Effective Income Tax Rate Reconciliation Change In Reinvestment Assertion Percent EffectiveIncomeTaxRateReconciliationChangeInReinvestmentAssertionPercent	0
CY2022	glt	Effective Income Tax Rate Reconciliation Change In Reinvestment Assertion Percent EffectiveIncomeTaxRateReconciliationChangeInReinvestmentAssertionPercent	0
CY2021	glt	Effective Income Tax Rate Reconciliation Change In Reinvestment Assertion Percent EffectiveIncomeTaxRateReconciliationChangeInReinvestmentAssertionPercent	0.264
CY2023	glt	Effective Income Tax Rate Reconciliation Change In Enacted Tax Law Percent EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxLawPercent	-0.013
CY2022	glt	Effective Income Tax Rate Reconciliation Change In Enacted Tax Law Percent EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxLawPercent	-0.002
CY2021	glt	Effective Income Tax Rate Reconciliation Change In Enacted Tax Law Percent EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxLawPercent	0.028
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	0.016
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-0.187
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.005
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.007
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.039
CY2023	glt	Effective Income Tax Rate Reconciliation Nondeductible Officers Compensation EffectiveIncomeTaxRateReconciliationNondeductibleOfficersCompensation	0
CY2022	glt	Effective Income Tax Rate Reconciliation Nondeductible Officers Compensation EffectiveIncomeTaxRateReconciliationNondeductibleOfficersCompensation	-0.003
CY2021	glt	Effective Income Tax Rate Reconciliation Nondeductible Officers Compensation EffectiveIncomeTaxRateReconciliationNondeductibleOfficersCompensation	0.039
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.301
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.068
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.031
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	-0.015
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0
CY2023	glt	Effective Income Tax Rate Reconciliation Recognition Of Non Us Intangible Tax Basis Percent EffectiveIncomeTaxRateReconciliationRecognitionOfNonUSIntangibleTaxBasisPercent	0
CY2022	glt	Effective Income Tax Rate Reconciliation Recognition Of Non Us Intangible Tax Basis Percent EffectiveIncomeTaxRateReconciliationRecognitionOfNonUSIntangibleTaxBasisPercent	0
CY2021	glt	Effective Income Tax Rate Reconciliation Recognition Of Non Us Intangible Tax Basis Percent EffectiveIncomeTaxRateReconciliationRecognitionOfNonUSIntangibleTaxBasisPercent	0.781
CY2023	glt	Effective Income Tax Rate Reconciliation Capitalized Transaction Costs Percent EffectiveIncomeTaxRateReconciliationCapitalizedTransactionCostsPercent	0
CY2022	glt	Effective Income Tax Rate Reconciliation Capitalized Transaction Costs Percent EffectiveIncomeTaxRateReconciliationCapitalizedTransactionCostsPercent	0
CY2021	glt	Effective Income Tax Rate Reconciliation Capitalized Transaction Costs Percent EffectiveIncomeTaxRateReconciliationCapitalizedTransactionCostsPercent	0.089
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0.130
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings	0
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.015
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.069
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.099
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.051
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.509
CY2023	glt	Effective Income Tax Rate Reconciliation Notional Interest Deduction Carryforward Foreign EffectiveIncomeTaxRateReconciliationNotionalInterestDeductionCarryforwardForeign	9300000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	119000000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	391000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	1489000	usd
CY2023Q4	glt	Deferred Tax Assets Tax Deferred Expense Environmental DeferredTaxAssetsTaxDeferredExpenseEnvironmental	3279000	usd
CY2022Q4	glt	Deferred Tax Assets Tax Deferred Expense Environmental DeferredTaxAssetsTaxDeferredExpenseEnvironmental	3562000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2583000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2687000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	1473000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	2323000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	749000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	795000	usd
CY2023Q4	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	6062000	usd
CY2022Q4	us-gaap	Deferred Tax Assets In Process Research And Development DeferredTaxAssetsInProcessResearchAndDevelopment	5986000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	2635000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	1984000	usd
CY2023Q4	glt	Deferred Tax Assets Tax Carryforwards DeferredTaxAssetsTaxCarryforwards	101017000	usd
CY2022Q4	glt	Deferred Tax Assets Tax Carryforwards DeferredTaxAssetsTaxCarryforwards	61828000	usd
CY2023Q4	us-gaap	Deferred Tax Asset Interest Carryforward DeferredTaxAssetInterestCarryforward	59579000	usd
CY2022Q4	us-gaap	Deferred Tax Asset Interest Carryforward DeferredTaxAssetInterestCarryforward	9854000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2540000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1689000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	180308000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	92197000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	126516000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	52960000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	53792000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	39237000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	77518000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	79164000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	3940000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1549000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	0	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	0	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5963000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3591000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	87421000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	84304000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	33629000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	45067000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1552000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1803000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	60733000	usd
CY2023Q4	glt	Deferred Tax Assets Other Noncurrent DeferredTaxAssetsOtherNoncurrent	18590000	usd
CY2022Q4	glt	Deferred Tax Assets Other Noncurrent DeferredTaxAssetsOtherNoncurrent	9321000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	52219000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	54388000	usd
CY2023Q4	glt	Operating Loss Carryforwards Subject To Expiration OperatingLossCarryforwardsSubjectToExpiration	800000	usd
CY2023Q4	glt	Operating Loss Carryforwards Not Subject To Expiration OperatingLossCarryforwardsNotSubjectToExpiration	123500000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	126500000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	53000000	usd
CY2023Q4	glt	Research And Development Tax Credits ResearchAndDevelopmentTaxCredits	500000	usd
CY2022Q4	glt	Research And Development Tax Credits ResearchAndDevelopmentTaxCredits	700000	usd
CY2021Q4	glt	Research And Development Tax Credits ResearchAndDevelopmentTaxCredits	0	usd
CY2023Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	94000000	usd
CY2022Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	130000000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	2300000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	60700000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	56500000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55700000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	58100000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	56506000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55660000	usd
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	46259000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	51000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	38000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	995000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	638000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	12718000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5728000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3644000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3683000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	usd
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	usd
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	56506000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	55660000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	6251000	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	4767000	usd
CY2021Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3947000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	2782000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	2975000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	3020000	usd
CY2023	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	1483000	usd
CY2022	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	820000	usd
CY2021	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	974000	usd
CY2023	us-gaap	Prescription Drug Benefit Effect Of Subsidy On Net Periodic Postretirement Benefit Cost1 PrescriptionDrugBenefitEffectOfSubsidyOnNetPeriodicPostretirementBenefitCost1	10000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	28300000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	34729000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	28300000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	34729000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	usd
CY2022Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	usd
CY2022Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	38175000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	662916000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	675811000	usd
CY2023	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.50
CY2023	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.07
CY2023	glt	Defined Contribution Plan Employer Discretionary Matching Contribution Percent Of Match DefinedContributionPlanEmployerDiscretionaryMatchingContributionPercentOfMatch	0.070
CY2022	glt	Defined Contribution Plan Employer Discretionary Matching Contribution Percent Of Match DefinedContributionPlanEmployerDiscretionaryMatchingContributionPercentOfMatch	0.075
CY2021	glt	Defined Contribution Plan Employer Discretionary Matching Contribution Percent Of Match DefinedContributionPlanEmployerDiscretionaryMatchingContributionPercentOfMatch	0.10
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4300000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2700000	usd
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2400000	usd
CY2023Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	82012000	usd
CY2022Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	109166000	usd
CY2023Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	150220000	usd
CY2022Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	142331000	usd
CY2023Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	66016000	usd
CY2022Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	57939000	usd
CY2023Q4	us-gaap	Inventory Net InventoryNet	298248000	usd
CY2022Q4	us-gaap	Inventory Net InventoryNet	309436000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	696928000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	645404000	usd
CY2023Q4	glt	Property Plant And Equipment Net Excluding Construction In Progress Asset Retirement Obligation PropertyPlantAndEquipmentNetExcludingConstructionInProgressAssetRetirementObligation	631230000	usd
CY2022Q4	glt	Property Plant And Equipment Net Excluding Construction In Progress Asset Retirement Obligation PropertyPlantAndEquipmentNetExcludingConstructionInProgressAssetRetirementObligation	637636000	usd
CY2023Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	31686000	usd
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4600000	usd
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	5200000	usd
CY2021Q4	us-gaap	Goodwill Goodwill	236165000	usd
CY2022	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	118952000	usd
CY2022	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-500000	usd
CY2022	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-11518000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	105195000	usd
CY2023	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	0	usd
CY2023	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2496000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	107691000	usd
CY2021Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	214022000	usd
CY2022	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	75399000	usd
CY2022	glt	Intangible Assets Gross Foreign Currency Translation Gain Loss IntangibleAssetsGrossForeignCurrencyTranslationGainLoss	-5189000	usd
CY2022Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	133434000	usd
CY2023	glt	Intangible Assets Gross Foreign Currency Translation Gain Loss IntangibleAssetsGrossForeignCurrencyTranslationGainLoss	8614000	usd
CY2023Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	142048000	usd
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	57718000	usd
CY2022	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	-41731000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9848000	usd
CY2022	glt	Intangible Assets Accumulated Amortization Foreign Currency Translation Gain Loss IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationGainLoss	1071000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	24764000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9166000	usd
CY2023	glt	Intangible Assets Accumulated Amortization Foreign Currency Translation Gain Loss IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationGainLoss	-1785000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	35715000	usd
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	156304000	usd
CY2022	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	33668000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9848000	usd
CY2022	glt	Intangible Assets Foreign Currency Translation Gain Loss IntangibleAssetsForeignCurrencyTranslationGainLoss	-4118000	usd
CY2022Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	108670000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9166000	usd
CY2023	glt	Intangible Assets Foreign Currency Translation Gain Loss IntangibleAssetsForeignCurrencyTranslationGainLoss	6829000	usd
CY2023Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	106333000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9166000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9848000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9753000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	9408000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9408000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	9408000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9408000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	9408000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P13Y1M6D
CY2022Q4	us-gaap	Accrued Utilities Current AccruedUtilitiesCurrent	3844000	usd
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	3626000	usd
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	4147000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	24991000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	25420000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	18590000	usd
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	9321000	usd
CY2023Q4	glt	Tax Indemnification Asset Noncurrent TaxIndemnificationAssetNoncurrent	17229000	usd
CY2022Q4	glt	Tax Indemnification Asset Noncurrent TaxIndemnificationAssetNoncurrent	17229000	usd
CY2023Q4	us-gaap	Escrow Deposit EscrowDeposit	9009000	usd
CY2022Q4	us-gaap	Escrow Deposit EscrowDeposit	8777000	usd
CY2023Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	794000	usd
CY2022Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	4902000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	10276000	usd
CY2022Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	12544000	usd
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	80889000	usd
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	78193000	usd
CY2023Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	28802000	usd
CY2022Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	32863000	usd
CY2023Q4	glt	Accrued Tornado Costs Current AccruedTornadoCostsCurrent	29000000	usd
CY2022Q4	glt	Accrued Tornado Costs Current AccruedTornadoCostsCurrent	0	usd
CY2023Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	9285000	usd
CY2022Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	6179000	usd
CY2023Q4	glt	Accrued Rebates AccruedRebates	7100000	usd
CY2022Q4	glt	Accrued Rebates AccruedRebates	4328000	usd
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	5063000	usd
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4488000	usd
CY2023Q4	us-gaap	Accrued Utilities Current AccruedUtilitiesCurrent	4409000	usd
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	25473000	usd
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	32875000	usd
CY2023Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	112758000	usd
CY2022Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	88724000	usd
CY2023Q4	us-gaap	Contractual Obligation ContractualObligation	29000000	usd
CY2023Q4	us-gaap	Insurance Settlements Receivable Current InsuranceSettlementsReceivableCurrent	27000000	usd
CY2023	glt	Insurance Deductible Amount InsuranceDeductibleAmount	5000000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	24991000	usd
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	25420000	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0363
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0314
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P20Y
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P21Y
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	6685000	usd
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	5867000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5671000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4693000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2775000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2295000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1694000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	18542000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	871670000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	844232000	usd
CY2023Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1005000	usd
CY2022Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	40435000	usd
CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-17502000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-10545000	usd
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	853163000	usd
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	793252000	usd
CY2021	glt	Debt Instrument Number Of Loans Entered Into DebtInstrumentNumberOfLoansEnteredInto	2	loan
CY2023Q1	glt	Debt Instrument Number Of Loans Extinguished DebtInstrumentNumberOfLoansExtinguished	1	loan
CY2023Q1	us-gaap	Extinguishment Of Debt Amount ExtinguishmentOfDebtAmount	20000000	eur
CY2023Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	17500000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3000000.0	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1900000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	900000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1005000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	99450000	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	usd
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	776250000	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	0	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	871670000	usd
CY2023Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	729279000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	844232000	usd
CY2022Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	640188000	usd
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-3700000	usd
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	10800000	usd
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	2712000	usd
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	-163951000	usd
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	28614000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	63247000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	66724000	usd
CY2022Q4	us-gaap	Shares Outstanding SharesOutstanding	44794000	shares
CY2021Q4	us-gaap	Shares Outstanding SharesOutstanding	44549000	shares
CY2020Q4	us-gaap	Shares Outstanding SharesOutstanding	44368000	shares
CY2023	glt	Stock Issued During Period Shares Restricted Stock Award And Performance Share Award StockIssuedDuringPeriodSharesRestrictedStockAwardAndPerformanceShareAward	293000	shares
CY2022	glt	Stock Issued During Period Shares Restricted Stock Award And Performance Share Award StockIssuedDuringPeriodSharesRestrictedStockAwardAndPerformanceShareAward	245000	shares
CY2021	glt	Stock Issued During Period Shares Restricted Stock Award And Performance Share Award StockIssuedDuringPeriodSharesRestrictedStockAwardAndPerformanceShareAward	181000	shares
CY2023Q4	us-gaap	Shares Outstanding SharesOutstanding	45087000	shares
CY2022Q4	us-gaap	Shares Outstanding SharesOutstanding	44794000	shares
CY2021Q4	us-gaap	Shares Outstanding SharesOutstanding	44549000	shares
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5671000	usd
CY2023Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	14446000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4693000	usd
CY2023Q4	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2775000	usd
CY2023Q4	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2295000	usd
CY2023Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1694000	usd
CY2023Q4	us-gaap	Other Commitment Due In Fifth Year OtherCommitmentDueInFifthYear	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	18542000	usd
CY2023Q4	us-gaap	Other Commitment Due After Fifth Year OtherCommitmentDueAfterFifthYear	0	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35700000	usd
CY2023Q4	us-gaap	Other Commitment OtherCommitment	14400000	usd
CY2023Q4	glt	Number Of Miles For River Clean Up NumberOfMilesForRiverCleanUp	39	mi
CY2023	glt	Number Of Operable Units NumberOfOperableUnits	5	operable_unit
CY2023	glt	Environment Remediation Agreement Term EnvironmentRemediationAgreementTerm	P30Y
CY2023	glt	Environment Remediation Agreement Term EnvironmentRemediationAgreementTerm	P30Y
CY2023Q4	glt	Amount Available In Escrow Account AmountAvailableInEscrowAccount	9000000	usd
CY2023	glt	Difference Recorded In Escrow Account DifferenceRecordedInEscrowAccount	900000	usd
CY2023	glt	Environment Remediation Agreement Term EnvironmentRemediationAgreementTerm	P30Y
CY2022Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	14547000	usd
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	16200000	usd
CY2023	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	1049000	usd
CY2022	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	1848000	usd
CY2023	glt	Accrual For Environmental Loss Contingencies Accretion Of Discount AccrualForEnvironmentalLossContingenciesAccretionOfDiscount	199000	usd
CY2022	glt	Accrual For Environmental Loss Contingencies Accretion Of Discount AccrualForEnvironmentalLossContingenciesAccretionOfDiscount	195000	usd
CY2023Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	13697000	usd
CY2022Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	14547000	usd
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Current AccruedEnvironmentalLossContingenciesCurrent	2000000.0	usd
CY2023	glt	Environmental Loss Contingency Noncurrent Statement Of Financial Position Extensible Enumeration Not Disclosed Flag EnvironmentalLossContingencyNoncurrentStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Environmental liabilities
CY2023Q4	us-gaap	Accrued Environmental Loss Contingencies Noncurrent AccruedEnvironmentalLossContingenciesNoncurrent	11700000	usd
CY2023	glt	Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag	Other long-term liabilities
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1385516000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1491326000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1084694000	usd
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61421000	usd
CY2023	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	33770000	usd
CY2022	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	37740000	usd
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	30037000	usd
CY2023	glt	Amount Of Tons Sold AmountOfTonsSold	311544
CY2022	glt	Amount Of Tons Sold AmountOfTonsSold	340661
CY2021	glt	Amount Of Tons Sold AmountOfTonsSold	292844
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	662916000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	675811000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	758812000	usd
CY2023	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1385516000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	662916000	usd
CY2022	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1491326000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	675811000	usd
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	1084694000	usd
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	758812000	usd
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false

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2024 Q1 Form 10-K Financial Statement

#000004171924000007 Filed on February 28, 2024

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$MAGN Stock $magn

2024 Q1 Form 10-K Financial Statement

#000004171924000007 Filed on February 28, 2024

Income Statement

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Cashflow Statement

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