Magnera (MAGN) 10-Q 30 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 21, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	GLT
Entity Registrant Name	GLATFELTER P H CO
Entity Central Index Key	0000041719
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	1-03560
Entity Tax Identification Number	230628360
Entity Address, Address Line One	96 South George Street
Entity Address, Address Line Two	Suite 520
Entity Address, City or Town	York
Entity Address, State or Province	Pennsylvania
Entity Address, Postal Zip Code	17401
City Area Code	717
Local Phone Number	850-0170
Entity Common Stock, Shares Outstanding		44,171,151

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 232,515	$ 209,855	$ 696,701	$ 636,806
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Costs of products sold	$ 194,494	$ 179,983	$ 585,563	$ 537,073
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 38,021	$ 29,872	$ 111,138	$ 99,733
Selling, general and administrative expenses	23,721	25,799	71,143	81,915
Gains on dispositions of plant, equipment and timberlands, net	(235)	(249)	(1,327)	(1,939)
Operating income	14,535	4,322	41,322	19,757
Non-operating income (expense)
Interest expense	(1,902)	(3,965)	(8,513)	(11,237)
Interest income	185	147	931	227
Other, net	(1,034)	2,253	(3,547)	1,131
Total non-operating expense	(2,751)	(1,565)	(11,129)	(9,879)
Income from continuing operations before income taxes	11,784	2,757	30,193	9,878
Income tax provision	3,141	3,462	10,654	7,037
Income (loss) from continuing operations	8,643	(705)	19,539	2,841
Discontinued operations:
Income (loss) before income taxes	1,062	(114,656)	1,291	(128,714)
Income tax benefit	(2,519)	(19,530)	(2,511)	(28,361)
Income (loss) from discontinued operations	3,581	(95,126)	3,802	(100,353)
Net income (loss)	$ 12,224	$ (95,831)	$ 23,341	$ (97,512)
Basic earnings per share
Income (loss) from continuing operations	$ 0.19	$ (0.02)	$ 0.44	$ 0.06
Income (loss) from discontinued operations	0.09	(2.17)	0.09	(2.29)
Basic earnings (loss) per share	0.28	(2.19)	0.53	(2.23)
Diluted earnings (loss) per share
Income (loss) from continuing operations	0.19	(0.02)	0.44	0.06
Income (loss) from discontinued operations	0.09	(2.17)	0.09	(2.29)
Diluted earnings (loss) per share	0.28	(2.19)	0.53	(2.23)
Cash dividends declared per common share	$ 0.13	$ 0.13	$ 0.39	$ 0.39
Weighted average shares outstanding
Basic	44,171	43,792	44,113	43,754
Diluted	44,442	43,792	44,405	43,754

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 12,224	$ (95,831)	$ 23,341	$ (97,512)
Foreign currency translation adjustments	(17,073)	(3,217)	(20,452)	(23,693)
Net change in:
Deferred gains on cash flow hedges, net of taxes of $(873), $(582), $(1,629) and $(1,718), respectively	2,365	1,616	4,608	4,363
Unrecognized retirement obligations, net of taxes of $(220), $(1,932), $(1,606) and $(3,874), respectively	2,817	21,572	7,657	27,668
Other comprehensive income (loss)	(11,891)	19,971	(8,187)	8,338
Comprehensive income (loss)	$ 333	$ (75,860)	$ 15,154	$ (89,174)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Taxes on deferred gains on cash flow hedges	$ (873)	$ (582)	$ (1,629)	$ (1,718)
Taxes on unrecognized retirement obligations	$ (220)	$ (1,932)	$ (1,606)	$ (3,874)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 57,046	$ 142,685
Accounts receivable, net	121,050	119,772
Inventories	190,574	173,411
Prepaid expenses and other current assets	40,637	33,418
Total current assets	409,307	469,286
Plant, equipment and timberlands, net	524,021	556,044
Goodwill	146,093	153,463
Intangible assets, net	83,129	93,614
Other assets	83,016	67,347
Total assets	1,245,566	1,339,754
Liabilities and Shareholders' Equity
Current portion of long-term debt	22,235	10,785
Accounts payable	109,609	120,701
Dividends payable	5,742	5,719
Environmental liabilities	7,700	23,000
Other current liabilities	72,160	72,597
Total current liabilities	217,446	232,802
Long-term debt	329,771	400,962
Deferred income taxes	79,151	78,651
Other long-term liabilities	80,441	88,441
Total liabilities	706,809	800,856
Commitments and contingencies
Shareholders’ equity
Common stock	544	544
Capital in excess of par value	60,965	62,239
Retained earnings	776,424	770,305
Accumulated other comprehensive loss	(145,627)	(137,440)
Shareholders' equity before treasury stock	692,306	695,648
Less cost of common stock in treasury	(153,549)	(156,750)
Total shareholders’ equity	538,757	538,898
Total liabilities and shareholders’ equity	$ 1,245,566	$ 1,339,754

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net income (loss)	$ 23,341	$ (97,512)
(Income) loss from discontinued operations, net of taxes	(3,802)	100,353
Adjustments to reconcile to net cash provided (used) by continuing operations:
Depreciation, depletion and amortization	38,114	34,731
Amortization of debt issue costs and original issue discount	1,525	870
Deferred income tax benefit (provision)	441	(5,466)
Gains on dispositions of plant, equipment and timberlands, net	(1,327)	(1,939)
Share-based compensation	2,683	4,594
Change in operating assets and liabilities
Accounts receivable	(5,431)	(10,421)
Inventories	(23,728)	(40,314)
Prepaid and other current assets	(4,512)	(2,935)
Accounts payable	(5,347)	(2,019)
Accruals and other current liabilities	(5,891)	3,768
Other	(472)	78
Net cash provided (used) by operating activities from continuing operations	15,594	(16,212)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(18,017)	(32,155)
Proceeds from disposals of plant, equipment and timberlands, net	1,363	2,073
Acquisition, net of cash acquired	(1,974)
Other	(163)	(68)
Net cash used by investing activities from continuing operations	(18,791)	(30,150)
Financing activities
Net (repayments) borrowings under revolving credit facility	(30,183)	174,761
Repayment of 5.375% Notes	(250,000)
Proceeds from term loans	248,644
Payments of borrowing costs	(2,170)
Repayment of term loans	(11,020)	(8,373)
Payments of dividends	(17,194)	(17,064)
Payments related to share-based compensation awards and other	(755)	(1,008)
Net cash provided (used) by financing activities from continuing operations	(62,678)	148,316
Effect of exchange rate changes on cash	(1,794)	(3,931)
Net increase (decrease) in cash and cash equivalents	(67,669)	98,023
Change in cash and cash equivalents from discontinued operations	(17,970)	19,828
Cash and cash equivalents at the beginning of period	142,685	116,219
Cash and cash equivalents at the end of period	57,046	234,070
Cash paid for:
Interest, net of amounts capitalized	9,245	7,213
Income taxes, net	$ 10,741	$ 11,001

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)	Sep. 30, 2019	Jul. 01, 2019	Dec. 31, 2018
Interest rate on debt		1.25%
5.375% Notes, Due Oct. 2020 [Member]
Interest rate on debt	5.375%		5.375%

Statements of Shareholders' Equ

Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 708,928	$ 544	$ 62,594	$ 948,411	$ (140,675)	$ (161,946)
Reclassification pursuant to ASU No. 2018-02				22,298	(22,298)
Net income (loss)	(97,512)			(97,512)
Other comprehensive income (loss)	8,338				8,338
Comprehensive income (loss)	(89,174)
Cash dividends declared	(17,079)			(17,079)
Share-based compensation expense	4,594		4,594
Delivery of treasury shares
RSUs and PSAs	(483)		(2,397)			1,914
Employee stock options exercised — net	(540)		(1,162)			622
Ending Balance at Sep. 30, 2018	606,246	544	63,629	856,118	(154,635)	(159,410)
Beginning Balance at Jun. 30, 2018	686,952	544	62,827	957,643	(174,606)	(159,456)
Net income (loss)	(95,831)			(95,831)
Other comprehensive income (loss)	19,971				19,971
Comprehensive income (loss)	(75,860)
Cash dividends declared	(5,694)			(5,694)
Share-based compensation expense	890		890
Delivery of treasury shares
RSUs and PSAs	(7)		(21)			14
Employee stock options exercised — net	(35)		(67)			32
Ending Balance at Sep. 30, 2018	606,246	544	63,629	856,118	(154,635)	(159,410)
Beginning Balance at Dec. 31, 2018	538,898	544	62,239	770,305	(137,440)	(156,750)
Net income (loss)	23,341			23,341
Other comprehensive income (loss)	(8,187)				(8,187)
Comprehensive income (loss)	15,154
Cash dividends declared	(17,222)			(17,222)
Share-based compensation expense	2,683		2,683
Delivery of treasury shares
RSUs and PSAs	(324)		(2,421)			2,097
Employee stock options exercised — net	(432)		(1,536)			1,104
Ending Balance at Sep. 30, 2019	538,757	544	60,965	776,424	(145,627)	(153,549)
Beginning Balance at Jun. 30, 2019	543,119	544	59,920	769,940	(133,736)	(153,549)
Net income (loss)	12,224			12,224
Other comprehensive income (loss)	(11,891)				(11,891)
Comprehensive income (loss)	333
Cash dividends declared	(5,740)			(5,740)
Share-based compensation expense	1,045		1,045
Ending Balance at Sep. 30, 2019	$ 538,757	$ 544	$ 60,965	$ 776,424	$ (145,627)	$ (153,549)

Statements of Shareholders' E_2

Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended			9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Per share amount of cash dividends declared	$ 0.13		$ 0.13	$ 0.39	$ 0.39
Retained Earnings [Member]
Per share amount of cash dividends declared	$ 0.13	[1]	$ 0.13	$ 0.39	$ 0.39
[1]	0.13

Organization

Organization	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1. ORGANIZATION P. H. Glatfelter Company and subsidiaries is a leading global supplier of high-quality, innovative and customizable solutions found in tea and single-serve coffee filtration, personal hygiene and packaging products, as well as home improvement and industrial applications. We are headquartered in York, Pennsylvania, and operate facilities in the United States, Canada, Germany, France, the United Kingdom and the Philippines. We have sales and distribution offices in the U.S., Europe, Russia and China and our products are marketed worldwide, either directly to customers or through brokers and agents. The terms “we,” “us,” “our,” “the Company,” or “Glatfelter,” refer to P. H. Glatfelter Company and subsidiaries unless the context indicates otherwise.

Accounting Policies

Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Accounting Policies	2. ACCOUNTING POLICIES Basis of Presentation The unaudited condensed consolidated financial statements (“financial statements”) include the accounts of Glatfelter and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. We prepared these financial statements in accordance with accounting principles generally accepted in the United States of America (“generally accepted accounting principles” or “GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission pertaining to interim financial statements. In our opinion, the financial statements reflect all normal, recurring adjustments needed to present fairly our results for the interim periods. When preparing these financial statements, we have assumed you have read the audited consolidated financial statements included in our 2018 Annual Report on Form 10-K. Discontinued Operations The results of operations for our former Specialty Papers business have been classified as discontinued operations for all periods presented in the condensed consolidated statements of income. Accounting Estimates The preparation of financial statements in conformity with GAAP 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 revenues and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes actual results may differ from those estimates and assumptions. Recently Issued Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842) (“ASU 842”). This ASU requires organizations to recognize on its balance sheet the assets and liabilities for the rights and obligations created by leases. We adopted ASU 842 as of January 1, 2019 and elected to follow a modified retrospective method which permitted us to adopt the standard without restating previously reported periods. As a result of adopting ASU 842, we recorded a right of use asset and corresponding lease obligation of approximately $14.1 million. Refer to Note 14 “Leases” for additional information. In August 2017, the FASB issued ASU No. 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities" In June 2016, the FASB issued ASU No. 2016-13 “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisition	3. ACQUISITION On October 1, 2018, we completed our acquisition of Georgia-Pacific’s European nonwovens business (the “GP Business”) for $186 million and a working capital adjustment and post-closing purchase price adjustments of $2.0 million. The acquisition consisted of Georgia-Pacific’s operations located in Steinfurt, Germany, along with sales offices located in France and Italy. The Steinfurt facility produces high-quality airlaid products for the table-top, wipes, hygiene, food pad, and other nonwoven materials markets, competing in the marketplace with nonwoven technologies and substrates, as well as other materials focused primarily on consumer based end-use applications. The facility is a state-of-the-art, 32,000-metric-ton-capacity manufacturing facility that employs approximately 220 people. Steinfurt’s results were reported prospectively from the acquisition date as part of our Airlaid Materials operating segment. We financed the transaction through a combination of cash on hand and borrowings under our revolving credit facility. The allocation of the purchase price to assets acquired and liabilities assumed is as follows: In thousands Allocation Assets Cash and cash equivalents $ 7,540 Accounts receivable 13,277 Inventory 11,133 Prepaid and other current assets 869 Plant, equipment and timberlands 66,167 Intangible assets 43,573 Goodwill 74,770 Total assets 217,329 Liabilities Accounts payable 8,577 Deferred tax liabilities 19,119 Other long term liabilities 1,162 Total liabilities 28,858 Total 188,471 less cash acquired (7,540 ) Total purchase price $ 180,931 For purposes of allocating the total purchase price, assets acquired and liabilities assumed are recorded at their estimated fair market value. The allocation set forth above is based on management’s estimate of the fair value using valuation techniques such as discounted cash flow models, appraisals and similar methodologies. The amount allocated to intangible assets represents the estimated value of customer relationships, technological know-how and trade name. In connection with the Steinfurt acquisition we recorded $74.8 million of goodwill and $43.6 million of intangible assets. The goodwill arising from the acquisition largely relates to strategic benefits, product and market diversification, assembled workforce, and similar factors. For tax purposes, none of the goodwill is deductible. Intangible assets consist of technology, customer relationships and tradename. The following table summarizes unaudited pro forma financial information for the indicated periods of 2018 as if the acquisition occurred as of January 1, 2018: Three months ended September 30 Nine months ended September 30 In thousands, except per share (unaudited) Pro forma Net sales $ 233,043 $ 707,563 Income from continuing operations 2,463 7,558 Income per share from continuing operations 0.06 0.17

Revenue

Revenue	9 Months Ended
	Sep. 30, 2019
Disaggregation Of Revenue [Abstract]
Revenue	4. REVENUE The following tables set forth disaggregated information pertaining to our net sales: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Composite Fibers Food & beverage $ 66,637 $ 68,534 $ 208,480 $ 209,117 Wallcovering 20,673 26,135 62,181 82,056 Technical specialties 20,301 20,615 58,855 63,182 Composite laminates 8,859 10,544 26,552 28,902 Metallized 11,234 13,348 32,934 40,450 127,704 139,176 389,002 423,707 Airlaid Materials Feminine hygiene 52,159 46,054 158,998 141,464 Specialty wipes 17,994 11,104 52,982 29,366 Table top 19,179 2,091 48,857 6,335 Adult incontinence 5,855 5,036 17,708 14,658 Home care 4,857 4,009 13,173 11,911 Other 4,767 2,385 15,981 9,365 104,811 70,679 307,699 213,099 Total $ 232,515 $ 209,855 $ 696,701 $ 636,806 Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Composite Fibers Europe, Middle East and Africa $ 77,012 $ 87,870 $ 234,928 $ 274,442 Americas 33,179 30,205 98,783 83,245 Asia Pacific 17,513 21,101 55,291 66,020 127,704 139,176 389,002 423,707 Airlaid Materials Europe, Middle East and Africa 58,279 35,283 167,924 107,416 Americas 45,039 34,899 134,634 104,027 Asia Pacific 1,493 497 5,141 1,656 104,811 70,679 307,699 213,099 Total $ 232,515 $ 209,855 $ 696,701 $ 636,806

Discontinued Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2019
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	5. DISCONTINUED OPERATIONS On October 31, 2018, we completed the previously announced sale of our Specialty Papers business on a cash free and debt free basis to Pixelle Specialty Solutions LLC, an affiliate of Lindsay Goldberg (the “Purchaser”) for $360 million. Cash proceeds from the sale were approximately $323 million in cash reflecting estimated purchase price adjustments as of the closing date and the assumption by the Purchaser of approximately $38 million in retiree healthcare liabilities. In addition, the Purchaser assumed approximately $210 million of pension liabilities relating to Specialty Papers’ employees and received approximately $274 million of related assets from the Company’s existing pension plan. In connection with the sale of Specialty Papers, we entered into a Transition Services Agreement with Purchaser pursuant to which we agreed to provide various back-office and information technology support until the business is fully separated from us, which was completed in the third quarter of 2019. The following table sets forth a summary of discontinued operations included in the condensed consolidated statements of income: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Net sales $ — $ 201,288 $ — $ 590,757 Energy and related sales, net — 844 — 3,217 Total revenues — 202,132 — 593,974 Costs of products sold — 181,628 — 572,820 Gross profit — 20,504 — 21,154 Selling, general and administrative expenses (2,455 ) 6,058 (2,684 ) 18,566 Gains on dispositions of plant, equipment and timberlands, net — 3 — (440 ) Operating income 2,455 14,443 2,684 3,028 Non-operating income (expense) Interest expense — (2,281 ) — (6,017 ) Other, net (1,393 ) (1,174 ) (1,393 ) (81 ) Impairment charge — (125,644 ) — (125,644 ) Income (loss) before income taxes 1,062 (114,656 ) 1,291 (128,714 ) Income tax benefit (2,519 ) (19,530 ) (2,511 ) (28,361 ) Income (loss) from discontinued operations $ 3,581 $ (95,126 ) $ 3,802 $ (100,353 ) The amounts for 2018 presented above are derived from the segment reporting for Specialty Papers adjusted to include certain retirement benefit costs and to exclude corporate shared services costs which are required to remain in continuing operations. Interest expense was allocated to discontinued operations based on borrowings under the revolving credit facility required to be repaid with proceeds from the sale of Specialty Papers. The following table sets forth a summary of cash flows from discontinued operations which is included in the condensed consolidated statements of cash flows: Nine months ended September 30 In thousands 2019 2018 Net cash provided (used) by operating activities $ (9,749 ) $ 33,721 Net cash used by investing activities (8,221 ) (14,018 ) Net cash provided by financing activities — 125 Change in cash and cash equivalents from discontinued operations $ (17,970 ) $ 19,828

Gains on Disposition of Plant,

Gains on Disposition of Plant, Equipment and Timberlands	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Gains on Disposition of Plant, Equipment and Timberlands	6. GAINS ON DISPOSITION OF PLANT, EQUIPMENT AND TIMBERLANDS During the first nine months of 2019 and 2018 we completed the following sales of timberlands and other assets included in continuing operations: Dollars in thousands Acres Proceeds Gain 2019 Timberlands 463 $ 1,147 $ 1,114 Other n/a 216 213 Total $ 1,363 $ 1,327 2018 Timberlands 1,103 $ 2,046 $ 1,929 Other n/a 27 10 Total $ 2,073 $ 1,939

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	7. EARNINGS PER SHARE The following table sets forth the details of basic and diluted earnings per share (“EPS”) from continuing operations: Three months ended September 30 In thousands, except per share 2019 2018 Income (loss) from continuing operations $ 8,643 $ (705 ) Weighted average common shares outstanding used in basic EPS 44,171 43,792 Effect of dilutive SOSARs, PSAs and RSUs 271 — Weighted average common shares outstanding and common share equivalents used in diluted EPS 44,442 43,792 Earnings (loss) per share from continuing operations Basic $ 0.19 $ (0.02 ) Diluted 0.19 (0.02 ) Nine months ended September 30 In thousands, except per share 2019 2018 Income from continuing operations $ 19,539 $ 2,841 Weighted average common shares outstanding used in basic EPS 44,113 43,754 Effect of dilutive SOSARs, PSAs and RSUs 292 — Weighted average common shares outstanding and common share equivalents used in diluted EPS 44,405 43,754 Earnings per share from continuing operations Basic $ 0.44 $ 0.06 Diluted 0.44 0.06 The numerator used to compute income per share from discontinued operations was $3.581 million and $(95.126) million for the third quarter of 2019 and 2018, respectively, and $3.802 million and $(100.353) million for the first nine months of 2019 and 2018, respectively. The denominator used to compute per share amounts of loss from discontinued operations is the same as the denominator used for per share amounts of income from continuing operations. The following table sets forth potential common shares outstanding that were not included in the computation of diluted EPS for the periods indicated, because their effect would be anti-dilutive: September 30 In thousands 2019 2018 Three months ended 1,233 2,393 Nine months ended 1,233 2,393

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Income	8 . ACCUMULATED OTHER COMPREHENSIVE INCOME The following table sets forth details of the changes in accumulated other comprehensive income (losses) for the three months and nine months ended September 30, 2019 and 2018. In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at July 1, 2019 $ (73,001 ) $ 4,442 $ (66,325 ) $ 1,148 $ (133,736 ) Other comprehensive income (loss) before reclassifications (net of tax) (17,073 ) 3,596 2,449 — (11,028 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,231 ) 592 (224 ) (863 ) Net current period other comprehensive income (loss) (17,073 ) 2,365 3,041 (224 ) (11,891 ) Balance at September 30, 2019 $ (90,074 ) $ 6,807 $ (63,284 ) $ 924 $ (145,627 ) Balance at July 1, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Other comprehensive income (loss) before reclassifications (net of tax) (3,217 ) 627 12,981 4,699 15,090 Amounts reclassified from accumulated other comprehensive income (net of tax) — 989 4,053 (161 ) 4,881 Net current period other comprehensive income (loss) (3,217 ) 1,616 17,034 4,538 19,971 Balance at September 30, 2018 $ (65,532 ) $ 271 $ (98,133 ) $ 8,759 $ (154,635 ) In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at January 1, 2019 $ (69,622 ) $ 2,199 $ (71,431 ) $ 1,414 $ (137,440 ) Other comprehensive income (loss) before reclassifications (net of tax) (20,452 ) 7,326 7,375 — (5,751 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — (2,718 ) 772 (490 ) (2,436 ) Net current period other comprehensive income (loss) (20,452 ) 4,608 8,147 (490 ) (8,187 ) Balance at September 30, 2019 $ (90,074 ) $ 6,807 $ (63,284 ) $ 924 $ (145,627 ) Balance at January 1, 2018 $ (41,839 ) $ (4,092 ) $ (98,295 ) $ 3,551 $ (140,675 ) Amount reclassified for adoption of ASU No. 2018-02 (23,297 ) 999 $ (22,298 ) Balance as adjusted at January 1, 2018 (41,839 ) (4,092 ) (121,592 ) 4,550 (162,973 ) Other comprehensive income (loss) before reclassifications (net of tax) (23,693 ) 778 12,981 4,699 (5,235 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 3,585 10,478 (490 ) 13,573 Net current period other comprehensive income (loss) (23,693 ) 4,363 23,459 4,209 8,338 Balance at September 30, 2018 $ (65,532 ) $ 271 $ (98,133 ) $ 8,759 $ (154,635 ) Reclassifications out of accumulated other comprehensive income and into the condensed consolidated statements of income were as follows: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Description Line Item in Statements of Income Cash flow hedges (Note 17) (Gains) losses on cash flow hedges $ (1,738 ) $ 1,344 $ (3,783 ) $ 4,939 Costs of products sold Tax expense (benefit) 507 (355 ) 1,065 (1,354 ) Income tax provision Net of tax (1,231 ) 989 (2,718 ) 3,585 Retirement plan obligations (Note 11) Amortization of deferred benefit pension plans Prior service costs 64 5 152 16 Other, net Actuarial losses 819 2,060 2,383 6,179 Other, net Discontinued operations amortization of defined benefit pension plans — 2,171 — 6,515 Discontinued operations Curtailment and Settlement recognition — 1,805 — 1,805 Discontinued operations 883 6,041 2,535 14,515 Tax benefit (291 ) (1,988 ) (1,763 ) (4,037 ) Income tax provision Net of tax 592 4,053 772 10,478 Amortization of deferred benefit other plans Prior service costs (2 ) — (7 ) — Other, net Actuarial gains (293 ) (16 ) (639 ) (49 ) Other, net Discontinued operations amortization of defined benefit other plans — (201 ) — (604 ) Discontinued operations (295 ) (217 ) (646 ) (653 ) Tax expense 71 56 156 163 Income tax provision Net of tax (224 ) (161 ) (490 ) (490 ) Total reclassifications, net of tax $ (863 ) $ 4,881 $ (2,436 ) $ 13,573

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	9. INCOME TAXES Income taxes are recognized for the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The effects of income taxes are measured based on enacted tax laws and rates. We elect to account for the tax associated with the Global Intangible Low-Taxed Income (GILTI) provision of the 2017 Tax Cuts and Jobs Act in the period in which it is incurred. The GILTI provisions require entities to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. For the nine months ended September 30, 2019, our effective tax rate increased by approximately 6% as a result of the GILTI provisions due to our U.S. federal tax loss carryforward position which limits our ability to recognize the associated foreign tax credits and a deduction of up to 50% of the GILTI income. Due to our U.S. federal tax loss carryforward position, there is no impact to cash taxes related to the GILTI provisions. For the nine months ended September 30, 2019, we recorded an additional valuation allowance of $0.3 million against our net deferred tax assets primarily due to uncertainty regarding our ability to utilize federal net operating losses and credit carryforwards. In assessing the need for a valuation allowance, we consider all available positive and negative evidence in our analysis. Based on this analysis, we recorded a valuation allowance for the portion of deferred tax assets where the weight of the evidence indicated it is more likely than not that the deferred tax assets will not be realized. As of September 30, 2019 and December 31, 2018, we had $29.5 million and $29.6 million, respectively, of gross unrecognized tax benefits. As of September 30, 2019, if such benefits were to be recognized, approximately $18.6 million would be recorded as a component of income tax expense, thereby affecting our effective tax rate. We, or one of our subsidiaries, file income tax returns with the United States Internal Revenue Service, as well as various state and foreign authorities. The following table summarizes, by major jurisdiction, tax years that remain subject to examination: Open Tax Years Jurisdiction Examinations not yet initiated Examination in progress United States Federal 2016 - 2018 N/A State 2014 - 2018 N/A Canada (1) 2012-2013; 2018 2014 - 2017 Germany (1) 2016 - 2018 2012 - 2015 France 2018 N/A United Kingdom 2017 - 2018 N/A Philippines 2018 2016, 2017 (1) includes provincial or similar local jurisdictions, as applicable The amount of income taxes we pay is subject to ongoing audits by federal, state and foreign tax authorities, which often result in proposed assessments. Management performs a comprehensive review of its global tax positions on a quarterly basis and accrues amounts for uncertain tax positions. Based on these reviews and the result of discussions and resolutions of matters with certain tax authorities and the closure of tax years subject to tax audit, reserves are adjusted as necessary. However, future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are determined or resolved or as such statutes are closed. Due to potential for resolution of federal, state and foreign examinations, and the lapse of various statutes of limitation, it is reasonably possible our gross unrecognized tax benefits balance may decrease within the next twelve months by a range of zero to $4.3 million. Substantially all this range relates to tax positions taken in Germany and the U.S. We recognize interest and penalties related to uncertain tax positions as income tax expense. The following table summarizes information included in continuing operations related to interest and penalties on uncertain tax positions: Nine months ended September 30 In millions 2019 2018 Interest expense (income) $ — $ 0.3 Penalties — — September 30 December 31 2019 2018 Accrued interest payable $ 1.1 $ 1.1

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. STOCK-BASED COMPENSATION The P. H. Glatfelter Amended and Restated Long Term Incentive Plan (the “LTIP”) provides for the issuance of Glatfelter common stock to eligible participants in the form of restricted stock units, restricted stock awards, non-qualified stock options, performance shares, incentive stock options and performance units. Pursuant to terms of the LTIP, we have issued to eligible participants restricted stock units, performance share awards and stock only stock appreciation rights. Restricted Stock Units (“RSU”) and Performance Share Awards (“PSAs”) Awards of RSUs and PSAs are made under our LTIP. The RSUs vest on the passage of time, generally on a graded scale over a three, four, and five-year period, or in certain instances the RSUs were issued with five-year cliff vesting. PSAs are issued to participants and vesting is based on achievement of cumulative financial performance targets covering a two-year period followed by an additional one-year service period. In addition, beginning in 2018, PSA awards include a modifier based on our three-year total shareholder return (“TSR”) relative to the TSR of the S&P SmallCap 600 Index. The performance measures include a minimum, target and maximum performance level providing the grantees an opportunity to receive more or less shares than targeted depending on actual financial performance. In addition, the number of shares earned may be further increased or decreased based on our TSR relative to the S&P SmallCap 600 Index. For RSUs, the grant date fair value of the awards, which is equal to the closing price per common share on the date of the award, is used to determine the amount of expense to be recognized over the applicable service period. For PSAs, the grant date fair value is estimated using a lattice model. The significant inputs include the stock price, volatility, dividend yield, and risk-free rate of return. Settlement of RSUs and PSAs will be made in shares of our common stock currently held in treasury. The following table summarizes RSU and PSA activity during periods indicated: Units 2019 2018 Balance at January 1, 756,786 929,386 Granted 484,108 398,005 Forfeited (158,767 ) (73,673 ) Shares delivered (163,078 ) (151,371 ) Balance at September 30, 919,049 1,102,347 The amount granted in 2019 and 2018 includes 218,422 and 184,121, respectively, of PSAs exclusive of reinvested dividends. The following table sets forth aggregate RSU and PSA compensation expense included in continuing operations for the periods indicated: September 30 In thousands 2019 2018 Three months ended $ 1,048 $ 1,022 Nine months ended 2,643 4,283 Stock Only Stock Appreciation Rights (“SOSARs”) Under terms of the SOSAR, a recipient receives the right to a payment in the form of shares of common stock equal to the difference, if any, in the fair market value of one share of common stock at the time of exercising the SOSAR and the exercise price. The SOSARs vest ratably over a three year period and have a term of ten years. No SOSARs were awarded since 2016. The following table sets forth information related to outstanding SOSARS: 2019 2018 SOSARS Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 2,334,742 $ 18.08 2,561,846 $ 17.87 Granted — — — — Exercised (441,920 ) 14.31 (158,545 ) 13.31 Canceled / forfeited (446,435 ) 21.06 (51,285 ) 22.35 Outstanding at September 30, 1,446,387 $ 19.31 2,352,016 $ 18.08 The following table sets forth SOSAR compensation expense included in continuing operations for the periods indicated: September 30 In thousands 2019 2018 Three months ended $ — $ 67 Nine months ended 40 311

Retirement Plans and Other Post

Retirement Plans and Other Post-Retirement Benefits	9 Months Ended
	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Retirement Plans and Other Post-Retirement Benefits	11. RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS The following tables provide information with respect to the net periodic costs of our pension and post-retirement medical benefit plans included in continuing operations. Three months ended September 30 In thousands 2019 2018 Pension Benefits Service cost $ 216 $ 595 Interest cost 3,287 3,241 Expected return on plan assets (3,895 ) (5,531 ) Amortization of prior service cost 64 5 Amortization of unrecognized loss 819 2,060 Total net periodic benefit cost $ 491 $ 370 Other Benefits Service cost $ 7 $ 16 Interest cost 67 80 Amortization of prior service credit (2 ) — Amortization of actuarial gain (293 ) (16 ) Total net periodic benefit cost $ (221 ) $ 80 Nine months ended September 30 In thousands 2019 2018 Pension Benefits Service cost $ 1,073 $ 1,784 Interest cost 10,074 9,723 Expected return on plan assets (11,290 ) (16,592 ) Amortization of prior service cost 152 16 Amortization of unrecognized loss 2,383 6,179 Total net periodic benefit cost $ 2,392 $ 1,110 Other Benefits Service cost $ 25 $ 46 Interest cost 235 239 Amortization of prior service credit (7 ) — Amortization of actuarial gain (639 ) (49 ) Total net periodic benefit cost $ (386 ) $ 236 In April 2019, we informed participants that our qualified pension plan benefits would be frozen as of May 31, 2019 and the plan was terminated June 30, 2019. We replaced this benefit for active employees with an enhanced defined contribution plan. In connection with the termination, we remeasured the pension liability and recognized a gain of $1.9 million in the second quarter of 2019 as an adjustment to other comprehensive income (loss).

Inventories

Inventories	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	12. INVENTORIES Inventories, net of reserves, were as follows: September 30 December 31 In thousands 2019 2018 Raw materials $ 55,357 $ 50,205 In-process and finished 97,409 84,894 Supplies 37,808 38,312 Total $ 190,574 $ 173,411

Capitalized Interest

Capitalized Interest	9 Months Ended
	Sep. 30, 2019
Interest Expense [Abstract]
Capitalized Interest	13. CAPITALIZED INTEREST The following table sets forth details of interest incurred, capitalized and expensed included in continuing operations: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Interest cost incurred $ 1,902 $ 3,965 $ 8,513 $ 11,633 Interest capitalized — — — 396 Interest expense $ 1,902 $ 3,965 $ 8,513 $ 11,237 Capitalized interest relates to spending for the Airlaid capacity expansion project.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	14. LEASES We enter into a variety of arrangements in which we are the lessee for the use of automobiles, forklifts and other production equipment, production facilities, warehouses and office space. We determine if an arrangement contains a lease at inception. All our lease arrangements are operating leases and are recorded in the condensed consolidated balance sheet under the caption “Other assets” and the lease obligation is under “Other current liabilities” and “Other long-term liabilities.” We currently do not have any finance leases. Operating lease right of use (“ROU”) assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. ROU assets also include any initial direct costs incurred and any lease payments made at or before the lease commencement date, less lease incentives received. We use our incremental borrowing rate based on information available at the commencement date in determining the lease liabilities as our leases generally do not provide an implicit rate. Lease terms may include options to extend or terminate when we are reasonably certain that the option will be exercised. Lease expense is recognized on a straight-line basis over the lease term. We also have arrangements with both lease and non-lease components. The Company elected the practical expedient not to separate non-lease components from lease components for the Company’s real estate and automobile leases. We elected to apply the short-term lease measurement and recognition exemption in which ROU assets and lease liabilities are not recognized for arrangements less than twelve months in duration. At September 30, 2019, the ROU assets and corresponding lease obligation included in our condensed consolidated balance sheet totaled $11.1 million and had a weighted average remaining maturity of 36 months. The weighted average discount rate used to value the leases at inception was 3.02%. We recognized $4.4 million of operating lease expense during the first nine months of 2019. The following table sets forth required minimum lease payments for the periods indicated: September 30 December 31 In thousands 2019 2018 2019 $ 1,342 $ 5,020 2020 4,502 3,861 2021 3,025 2,515 2022 1,583 1,426 2023 568 584 Thereafter 335 383

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	15. LONG-TERM DEBT Long-term debt is summarized as follows: September 30 December 31 In thousands 2019 2018 Revolving credit facility, due Mar. 2020 $ — $ 114,495 Revolving credit facility, due Feb. 2024 79,490 — 5.375% Notes, due Oct. 2020 — 250,000 Term loan, due Feb. 2024 236,564 — 2.40% Term Loan, due Jun. 2022 4,278 5,725 2.05% Term Loan, due Mar. 2023 20,342 25,972 1.30% Term Loan, due Jun. 2023 5,834 7,361 1.55% Term Loan, due Sep. 2025 8,006 9,470 Total long-term debt 354,514 413,023 Less current portion (22,235 ) (10,785 ) Unamortized deferred issuance costs (2,508 ) (1,276 ) Long-term debt, net of current portion $ 329,771 $ 400,962 On February 8, 2019, we entered into an amended and restated $400 million Revolving Credit Facility and a €220 million Term Loan with a consortium of banks (together, the “Credit Agreement”). The proceeds of the Term Loan due Feb. 2024 were used to redeem in its entirety the 5.375% Notes. The principal amount of the Term Loan amortizes in consecutive quarterly installments of principal, with each such quarterly installment to be in an amount equal to 1.25% of the Term Loan funded, commencing on July 1, 2019 and continuing quarterly thereafter. The €220 million Term Loan is designated as a net investment hedge of our Euro functional currency foreign subsidiaries. During the first nine months of 2019, we recognized a pre-tax gain of $9.0 million from changes in currency exchange rates through Other Comprehensive Income (Loss). For all US dollar denominated borrowings under the Revolving Credit Facility, the borrowing rate is, at our option, either, (a) the bank’s base rate which is equal to the greater of i) the prime rate; ii) the federal funds rate plus 50 basis points; or iii) the Euro-rate plus 100 basis points plus an applicable spread over either i), ii) or iii) ranging from 12.5 basis points to 100 basis points based on the Company’s leverage ratio and its corporate credit ratings determined by Standard & Poor’s Rating Services and Moody’s Investor Service, Inc. (the “Corporate Credit Rating”); or (b) the Euro-rate plus an applicable margin ranging from 112.5 basis points to 200 basis points based on the Company’s leverage ratio and the Corporate Credit Rating. For non-US dollar denominated borrowings, the borrowing rate is, at our option, based on (b) above or for Euro denominated borrowings, the Euro Interbank Offering Rate (“EURIBOR”) plus an applicable margin ranging from 112.5 basis points to 200 basis points based on the Company’s leverage ratio and the Corporate Credit Rating. In October 2019, we entered into a €180 million notional value floating-to-fixed interest rate swap agreement with certain financial institutions. Under the terms of the swap, we will pay a fixed interest rate of the applicable margin plus 0.0395% on €180 million of the underlying variable rate term loan. We will receive the greater of 0.00% or EURIBOR. The Credit Agreement contains a number of customary covenants for financings of this type that, among other things, restrict our ability to dispose of or create liens on assets, incur additional indebtedness, repay other indebtedness, limits certain intercompany financing arrangements, make acquisitions and engage in mergers or consolidations. We are also required to comply with specified financial tests and ratios including: i) maximum net debt to EBITDA ratio (the “leverage ratio”); and ii) a consolidated EBITDA to interest expense ratio. The most restrictive of our covenants is a maximum leverage ratio of 4.0x provided that such ratio increases to 4.5x during the period of four fiscal quarters immediately following a material acquisition such as Steinfurt. As of September 30, 2019, the leverage ratio, as calculated in accordance with the definition in our Credit Agreement, was 2.9x. A breach of these requirements would give rise to certain remedies under the Revolving Credit Facility, among which are the termination of the agreement and accelerated repayment of the outstanding borrowings plus accrued and unpaid interest under the Credit Agreement. All remaining principal outstanding and accrued interest under the Credit Agreement will be due and payable on February 8, 2024. Glatfelter Gernsbach GmbH & Co. KG (“Gernsbach”), a wholly-owned subsidiary of ours, entered into a series of borrowing agreements with IKB Deutsche Industriebank AG, Düsseldorf (“IKB”) as summarized below: Amounts in thousands Original Principal Interest Rate Maturity Borrowing date Apr. 11, 2013 € 42,700 2.05 % Mar. 2023 Sep. 4, 2014 10,000 2.40 % Jun. 2022 Oct. 10, 2015 2,608 1.55 % Sep. 2025 Apr. 26, 2016 10,000 1.30 % Jun. 2023 May 4, 2016 7,195 1.55 % Sep. 2025 Each of the borrowings require quarterly repayments of principal and interest and provide for representations, warranties and covenants customary for financings of these types. The financial covenants contained in each of the IKB loans, which relate to the minimum ratio of consolidated EBITDA to consolidated interest expense and the maximum ratio of consolidated total net debt to consolidated adjusted EBITDA, are calculated by reference to our Credit Agreement. P. H. Glatfelter Company guarantees all debt obligations of its subsidiaries. All such obligations are recorded in these condensed consolidated financial statements. Letters of credit issued to us by certain financial institutions totaled $7.4 million as of September 30, 2019 and $5.2 million as of December 31, 2018. The letters of credit, which reduce amounts available under our Revolving Credit Facility, primarily provide financial assurances for the benefit of certain state workers compensation insurance agencies in conjunction with our self-insurance program and for performance of certain remediation activity related to the Fox River matter. We bear the credit risk on this amount to the extent that we do not comply with the provisions of certain agreements. No amounts are outstanding under the letters of credit.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	16. FAIR VALUE OF FINANCIAL INSTRUMENTS The amounts reported on the condensed consolidated balance sheets for cash and cash equivalents, accounts receivable and accounts payable approximate fair value. The following table sets forth carrying value and fair value of long-term debt: September 30, 2019 December 31, 2018 In thousands Carrying Value Fair Value Carrying Value Fair Value Variable rate debt $ 79,490 $ 79,490 $ 114,495 $ 114,495 Fixed-rate bonds — — 250,000 249,010 Term loan, due Feb. 2024 236,564 236,564 — — 2.40% Term loan 4,278 4,371 5,725 5,836 2.05% Term loan 20,342 20,757 25,972 26,346 1.30% Term Loan 5,834 5,873 7,361 7,341 1.55% Term loan 8,006 8,142 9,470 9,453 Total $ 354,514 $ 355,197 $ 413,023 $ 412,481 The values set forth above are based on observable inputs and other relevant market data (Level 2). The fair value of financial derivatives is set forth below in Note 17.

Financial Derivatives and Hedgi

Financial Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Financial Derivatives and Hedging Activities	17. FINANCIAL DERIVATIVES AND HEDGING ACTIVITIES As part of our overall risk management practices, we enter into financial derivatives primarily designed to either i) hedge foreign currency risks associated with forecasted transactions (“cash flow hedges”); or ii) mitigate the impact that changes in currency exchange rates have on intercompany financing transactions and foreign currency denominated receivables and payables (“foreign currency hedges”). Derivatives Designated as Hedging Instruments - Cash Flow Hedges We use currency forward contracts as cash flow hedges to manage our exposure to fluctuations in the currency exchange rates on certain forecasted production costs or capital expenditures expected to be incurred. Currency forward contracts involve fixing the exchange for delivery of a specified amount of foreign currency on a specified date. As of September 30, 2019 , the maturity of currency forward contracts ranged from one month to 18 months . We designate certain currency forward contracts as cash flow hedges of forecasted raw material purchases, certain production costs or capital expenditures with exposure to changes in foreign currency exchange rates. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges of foreign exchange risk is deferred as a component of accumulated other comprehensive income in the accompanying condensed consolidated balance sheets. With respect to hedges of forecasted raw material purchases or production costs, the amount deferred is subsequently reclassified into costs of products sold in the period that inventory produced using the hedged transaction affects earnings. For hedged capital expenditures, deferred gains or losses are reclassified and included in the historical cost of the capital asset and subsequently affect earnings as depreciation is recognized. We had the following outstanding derivatives that were used to hedge foreign exchange risks associated with forecasted transactions and designated as hedging instruments: In thousands September 30, 2019 December 31, 2018 Derivative Sell/Buy - sell notional Philippine Peso / British Pound — 13,140 Philippine Peso / Euro 6,784 16,446 Euro / British Pound 17,428 15,250 U.S. Dollar / Euro 6,859 88 U.S. Dollar / Canadian Dollar 1,850 — Sell/Buy - buy notional Euro / Philippine Peso 889,778 1,069,006 British Pound / Philippine Peso 1,083,507 980,137 Euro / U.S. Dollar 87,872 76,417 U.S. Dollar / Canadian Dollar 34,934 35,154 Canadian Dollar / U.S. Dollar 1,850 — British Pound / Euro — 216 Derivatives Not Designated as Hedging Instruments - Foreign Currency Hedges We also entered into forward foreign exchange contracts to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities. None of these contracts are designated as hedges for financial accounting purposes and, accordingly, changes in value of the foreign exchange forward contracts and in the offsetting underlying on-balance-sheet transactions are reflected in the accompanying condensed consolidated statements of income under the caption “Other, net.” The following sets forth derivatives used to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities: In thousands September 30, 2019 December 31, 2018 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 26,000 25,500 British Pound / Euro 3,000 2,000 Sell/Buy - buy notional Euro / U.S. Dollar 12,000 11,000 British Pound / Euro 9,000 8,000 These contracts have maturities of one month from the date originally entered into. Fair Value Measurements The following table summarizes the fair values of derivative instruments for the period indicated and the line items in the accompanying condensed consolidated balance sheets where the instruments are recorded: In thousands September 30 2019 December 31 2018 September 30 2019 December 31 2018 Prepaid Expenses and Other Other Balance sheet caption Current Assets Current Liabilities Designated as hedging: Forward foreign currency exchange contracts $ 7,679 $ 4,381 $ 220 $ 1,548 Not designated as hedging: Forward foreign currency exchange contracts $ 343 $ 103 $ 320 $ 122 The amounts set forth in the table above represent the net asset or liability giving effect to rights of offset with each counterparty. The effect of netting the amounts presented above did not have a material effect on our consolidated financial position. The following table summarizes the amount of income or (loss) from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying condensed consolidated statements of income where the results are recorded: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Designated as hedging: Forward foreign currency exchange contracts: Effective portion – cost of products sold $ 1,738 $ (1,344 ) $ 3,783 $ (4,939 ) Ineffective portion – other – net — 207 — (5 ) Not designated as hedging: Forward foreign currency exchange contracts: Other – net $ (511 ) $ (477 ) $ (483 ) $ (1,078 ) The impact of activity not designated as hedging was substantially all offset by the remeasurement of the underlying on-balance-sheet item. The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The fair values of the foreign exchange forward contracts are considered to be Level 2. Foreign currency forward contracts are valued using foreign currency forward and interest rate curves. The fair value of each contract is determined by comparing the contract rate to the forward rate and discounting to present value. Contracts in a gain position are recorded in the condensed consolidated balance sheets under the caption “Prepaid expenses and other current assets” and the value of contracts in a loss position is recorded under the caption “Other current liabilities.” A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income (loss), before taxes, is as follows: In thousands 2019 2018 Balance at January 1, $ 3,004 $ (5,640 ) Deferred gains on cash flow hedges 10,020 1,142 Reclassified to earnings (3,783 ) 4,939 Balance at September 30, $ 9,241 $ 441 We expect substantially all of the amounts recorded as a component of accumulated other comprehensive income will be recorded as a component of the capital asset or realized in results of operations within the next 12 to 18 months and the amount ultimately recognized will vary depending on actual market rates. Credit risk related to derivative activity arises in the event the counterparty fails to meet its obligations to us. This exposure is generally limited to the amounts, if any, by which the counterparty’s obligations exceed our obligation to them. Our policy is to enter into contracts only with financial institutions which meet certain minimum credit ratings.

Commitments, Contingencies and

Commitments, Contingencies and Legal Proceedings	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments, Contingencies and Legal Proceedings	18. COMMITMENTS, CONTINGENCIES AND LEGAL PROCEEDINGS Fox River - Neenah, Wisconsin Background. We previously reported we faced significant uncertainties associated with environmental claims arising out of the presence of polychlorinated biphenyls (“PCBs”) in sediments in the lower Fox River, on which our former Neenah facility was located, and in the Bay of Green Bay Wisconsin (collectively, the “Site”). We have resolved these uncertainties as described below. Since the early 1990s, the United States, the State of Wisconsin (collectively, the “Governments”) and two Indian tribes have pursued the cleanup of a 39-mile stretch of river from Little Lake Butte des Morts into Green Bay and natural resource damages (“NRDs”). The United States Environmental Protection Agency (“EPA”) has divided the Site into five “operable units”, including the most upstream portion of the Site on which our facility was located (“OU1”) and four downstream reaches of the river and bay (“OU2-5”). The United States originally notified several entities that they were potentially responsible parties (“PRPs”). We, with contributions of certain other PRPs, implemented the remedial action in OU1 under a consent decree with the Governments. That work is complete, other than on-going monitoring and maintenance. For OU2-5, after giving effect to settlements reached with the Governments, the remaining PRPs exposed to continuing obligations to implement the remainder of the cleanup consisted of us, Georgia Pacific Consumer Products, L.P. (“Georgia Pacific”) and NCR Corporation (“NCR”). The majority of the work in OU 2-5 has been funded or conducted by parties other than us. The cleanup is expected to continue at least through 2019, followed by decommissioning and post-remediation long-term monitoring and maintenance. In 2017, the United States entered into a consent decree with the State of Wisconsin, NCR, and Appvion under which NCR agreed to complete the remaining cleanup and both NCR and Appvion agreed not to seek to recover from us or anyone else any amounts they have spent or would spend, and we and others would be barred from seeking claims against NCR or Appvion. Under the consent decree, the Governments agreed to seek long term monitoring and maintenance in OU2-5 from us and Georgia Pacific; as the result of earlier settlements, Georgia Pacific was only responsible for that work in the most downstream three miles of the river (“OU4b”) and the bay of Green Bay (“OU5”). The Governments agreed to seek their past and future oversight costs only from us. We and Georgia Pacific had claims against each other to reallocate the costs that we had each incurred or would incur. In 2017, we entered into a settlement agreement with Georgia Pacific to settle these claims. Georgia Pacific agreed to implement the monitoring and maintenance in OU4b and OU5 and we agreed to monitoring and maintenance of all other upstream operable units. We paid Georgia Pacific $9.5 million in August 2017 in connection with this settlement. After years of extensive and complex litigation, in January 2019, we reached an agreement with the United States, the State of Wisconsin, and Georgia-Pacific to resolve all remaining claims among those parties. A consent decree (“Glatfelter consent decree”) documenting that agreement was entered in the federal district court on March 14, 2019. Under the Glatfelter consent decree, we paid $20.5 million to settle the United States’ and Wisconsin’s claims for response costs incurred by them prior to October 2018 and for NRDs. We also agreed to reimburse the governments for future oversight costs incurred over the next 30 years. We anticipate that a significant portion of the oversight costs will be incurred in the next few years while the remediation is being completed. Once finished, costs will be an order of magnitude lower in most years during the period of long-term monitoring and maintenance. In addition to our previous agreement to be responsible for long-term monitoring and maintenance of OU-1, under this consent decree, we agreed to be primarily responsible for long-term monitoring and maintenance in OU2-OU4a. period that the balance in that account exceeds the amount due under our fixed-price contract. The difference at present is approximately $ 2 million. We are also required to secure the payment of that difference with a renewal letter of credit or another instrument in the interim . Reserves for the Site. Our reserve for past and future government oversight costs and long-term monitoring and maintenance is set forth below: Nine months ended September 30 In thousands 2019 2018 Balance at January 1, $ 45,001 $ 43,144 Payments (20,771 ) (3,014 ) Reserve adjustment (2,509 ) — Assumption of WTM I escrow — 4,746 Accretion 141 115 Balance at September 30, $ 21,862 $ 44,991 Of our total reserve for the Fox River, $7.7 million is recorded in the accompanying September 30, 2019 condensed consolidated balance sheet under the caption “Environmental liabilities” and the remaining $14.2 million is recorded under the caption “Other long term liabilities.” In connection with the court approval of our January 2019 consent decree, we reduced our reserve by $2.5 million and recorded the adjustment as a reduction in “Selling, general and administrative” expenses in the condensed consolidated statements of income.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Information	19. SEGMENT INFORMATION The following tables set forth financial and other information by segment for the period indicated: Three months ended September 30 Other and Dollars in millions Composite Fibers Airlaid Materials Unallocated Total 2019 2018 2019 2018 2019 2018 2019 2018 Net sales $ 127.7 $ 139.2 $ 104.8 $ 70.7 $ — $ — $ 232.5 $ 209.9 Cost of products sold 106.0 116.8 88.4 62.3 0.1 0.9 194.5 180.0 Gross profit (loss) 21.7 22.4 16.4 8.4 (0.1 ) (0.9 ) 38.0 29.9 SG&A 10.6 10.5 4.8 2.9 8.3 12.4 23.7 25.8 Gains on dispositions of plant, equipment and timberlands, net — — — — (0.2 ) (0.2 ) (0.2 ) (0.2 ) Total operating income (loss) 11.1 11.9 11.6 5.5 (8.2 ) (13.1 ) 14.5 4.3 Non-operating expense — — — — (2.8 ) (1.6 ) (2.8 ) (1.6 ) Income (loss) before income taxes $ 11.1 $ 11.9 $ 11.6 $ 5.5 $ (11.0 ) $ (14.7 ) $ 11.8 $ 2.8 Supplementary Data Net tons sold (thousands) 33.4 37.4 35.9 24.0 — — 69.3 61.5 Depreciation, depletion and amortization $ 6.4 $ 7.1 $ 5.3 $ 3.4 $ 0.9 $ 1.0 $ 12.6 $ 11.5 Capital expenditures 4.0 3.0 2.9 1.9 0.5 1.3 7.4 6.2 Nine months ended September 30 Other and Dollars in millions Composite Fibers Airlaid Materials Unallocated Total 2019 2018 2019 2018 2019 2018 2019 2018 Net sales $ 389.0 $ 423.7 $ 307.7 $ 213.1 $ — $ — $ 696.7 $ 636.8 Cost of products sold 322.2 349.5 262.3 184.7 1.1 2.8 585.6 537.1 Gross profit (loss) 66.8 74.2 45.4 28.4 (1.1 ) (2.8 ) 111.1 99.7 SG&A 31.4 34.0 13.4 8.1 26.3 39.8 71.1 81.9 Gains on dispositions of plant, equipment and timberlands, net — — — — (1.3 ) (1.9 ) (1.3 ) (1.9 ) Total operating income (loss) 35.4 40.2 32.0 20.3 (26.1 ) (40.8 ) 41.3 19.8 Non-operating expense — — — — (11.1 ) (9.9 ) (11.1 ) (9.9 ) Income (loss) before income taxes $ 35.4 $ 40.2 $ 32.0 $ 20.3 $ (37.2 ) $ (50.7 ) $ 30.2 $ 9.9 Supplementary Data Net tons sold (thousands) 99.4 110.4 103.1 72.4 — — 202.6 182.8 Depreciation, depletion and amortization $ 19.7 $ 21.7 $ 15.8 $ 9.7 $ 2.6 $ 3.3 $ 38.1 $ 34.7 Capital expenditures 8.7 10.9 7.9 17.6 1.4 3.7 18.0 32.2 The sum of individual amounts set forth above may not agree to the condensed consolidated financial statements included herein due to rounding. Segments Results of individual operating segments are presented based on our management accounting practices and management structure. There is no comprehensive, authoritative body of guidance for management accounting equivalent to accounting principles generally accepted in the United States of America; therefore, the financial results of individual segments are not necessarily comparable with similar information for any other company. The management accounting process uses assumptions and allocations to measure performance of the segments. Methodologies are refined from time to time as management accounting practices are enhanced and businesses change. The costs incurred by support areas not directly aligned with the segment are allocated primarily based on an estimated utilization of support area services or are included in “Other and Unallocated” in the table set forth above. Management evaluates results of operations of the operating segments before certain corporate level costs and the effects of certain gains or losses not considered to be related to the core business operations. Management believes that this is a more meaningful representation of the operating performance of its core businesses, the profitability of the segments and the extent of cash flow generated from these core operations. Such amounts are presented under the caption “Other and Unallocated.” In the evaluation of operating segments results, management does not use any measures of total assets. This presentation is aligned with the management and operating structure of our company. It is also on this basis that the Company’s performance is evaluated internally and by the Company’s Board of Directors. Specialty Papers’ results of operations are reported as discontinued operations. In addition, corporate shared services costs previously included in Specialty Papers’ results are required to be included in income from continuing operations and are reported as “other and unallocated”.

Accounting Policies (Policies)

Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements (“financial statements”) include the accounts of Glatfelter and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. We prepared these financial statements in accordance with accounting principles generally accepted in the United States of America (“generally accepted accounting principles” or “GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission pertaining to interim financial statements. In our opinion, the financial statements reflect all normal, recurring adjustments needed to present fairly our results for the interim periods. When preparing these financial statements, we have assumed you have read the audited consolidated financial statements included in our 2018 Annual Report on Form 10-K.
Discontinued Operations	Discontinued Operations The results of operations for our former Specialty Papers business have been classified as discontinued operations for all periods presented in the condensed consolidated statements of income.
Accounting Estimates	Accounting Estimates The preparation of financial statements in conformity with GAAP 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 revenues and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes actual results may differ from those estimates and assumptions.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases (Topic 842) (“ASU 842”). This ASU requires organizations to recognize on its balance sheet the assets and liabilities for the rights and obligations created by leases. We adopted ASU 842 as of January 1, 2019 and elected to follow a modified retrospective method which permitted us to adopt the standard without restating previously reported periods. As a result of adopting ASU 842, we recorded a right of use asset and corresponding lease obligation of approximately $14.1 million. Refer to Note 14 “Leases” for additional information. In August 2017, the FASB issued ASU No. 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities" In June 2016, the FASB issued ASU No. 2016-13 “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Summary of Allocation of Purchase Price to Assets Acquired and Liabilities Assumed	The allocation of the purchase price to assets acquired and liabilities assumed is as follows: In thousands Allocation Assets Cash and cash equivalents $ 7,540 Accounts receivable 13,277 Inventory 11,133 Prepaid and other current assets 869 Plant, equipment and timberlands 66,167 Intangible assets 43,573 Goodwill 74,770 Total assets 217,329 Liabilities Accounts payable 8,577 Deferred tax liabilities 19,119 Other long term liabilities 1,162 Total liabilities 28,858 Total 188,471 less cash acquired (7,540 ) Total purchase price $ 180,931
Summary of Unaudited Pro Forma Financial Information	The following table summarizes unaudited pro forma financial information for the indicated periods of 2018 as if the acquisition occurred as of January 1, 2018: Three months ended September 30 Nine months ended September 30 In thousands, except per share (unaudited) Pro forma Net sales $ 233,043 $ 707,563 Income from continuing operations 2,463 7,558 Income per share from continuing operations 0.06 0.17

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2019
Disaggregation Of Revenue [Abstract]
Summary of Disaggregated Information Pertaining to Net Sales	The following tables set forth disaggregated information pertaining to our net sales: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Composite Fibers Food & beverage $ 66,637 $ 68,534 $ 208,480 $ 209,117 Wallcovering 20,673 26,135 62,181 82,056 Technical specialties 20,301 20,615 58,855 63,182 Composite laminates 8,859 10,544 26,552 28,902 Metallized 11,234 13,348 32,934 40,450 127,704 139,176 389,002 423,707 Airlaid Materials Feminine hygiene 52,159 46,054 158,998 141,464 Specialty wipes 17,994 11,104 52,982 29,366 Table top 19,179 2,091 48,857 6,335 Adult incontinence 5,855 5,036 17,708 14,658 Home care 4,857 4,009 13,173 11,911 Other 4,767 2,385 15,981 9,365 104,811 70,679 307,699 213,099 Total $ 232,515 $ 209,855 $ 696,701 $ 636,806 Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Composite Fibers Europe, Middle East and Africa $ 77,012 $ 87,870 $ 234,928 $ 274,442 Americas 33,179 30,205 98,783 83,245 Asia Pacific 17,513 21,101 55,291 66,020 127,704 139,176 389,002 423,707 Airlaid Materials Europe, Middle East and Africa 58,279 35,283 167,924 107,416 Americas 45,039 34,899 134,634 104,027 Asia Pacific 1,493 497 5,141 1,656 104,811 70,679 307,699 213,099 Total $ 232,515 $ 209,855 $ 696,701 $ 636,806

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2019
Discontinued Operations And Disposal Groups [Abstract]
Summary of Discontinued Operations Included in Condensed Consolidated Statements of Income (Loss)	The following table sets forth a summary of discontinued operations included in the condensed consolidated statements of income: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Net sales $ — $ 201,288 $ — $ 590,757 Energy and related sales, net — 844 — 3,217 Total revenues — 202,132 — 593,974 Costs of products sold — 181,628 — 572,820 Gross profit — 20,504 — 21,154 Selling, general and administrative expenses (2,455 ) 6,058 (2,684 ) 18,566 Gains on dispositions of plant, equipment and timberlands, net — 3 — (440 ) Operating income 2,455 14,443 2,684 3,028 Non-operating income (expense) Interest expense — (2,281 ) — (6,017 ) Other, net (1,393 ) (1,174 ) (1,393 ) (81 ) Impairment charge — (125,644 ) — (125,644 ) Income (loss) before income taxes 1,062 (114,656 ) 1,291 (128,714 ) Income tax benefit (2,519 ) (19,530 ) (2,511 ) (28,361 ) Income (loss) from discontinued operations $ 3,581 $ (95,126 ) $ 3,802 $ (100,353 )
Summary of Cash Flows from Discontinued Operations Included in Condensed Consolidated Statements of Cash Flows	The following table sets forth a summary of cash flows from discontinued operations which is included in the condensed consolidated statements of cash flows: Nine months ended September 30 In thousands 2019 2018 Net cash provided (used) by operating activities $ (9,749 ) $ 33,721 Net cash used by investing activities (8,221 ) (14,018 ) Net cash provided by financing activities — 125 Change in cash and cash equivalents from discontinued operations $ (17,970 ) $ 19,828

Gains on Disposition of Plant_2

Gains on Disposition of Plant, Equipment and Timberlands (Tables)	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Summary for Sale of Timberlands and Other Assets Included in Continuing Operations	During the first nine months of 2019 and 2018 we completed the following sales of timberlands and other assets included in continuing operations: Dollars in thousands Acres Proceeds Gain 2019 Timberlands 463 $ 1,147 $ 1,114 Other n/a 216 213 Total $ 1,363 $ 1,327 2018 Timberlands 1,103 $ 2,046 $ 1,929 Other n/a 27 10 Total $ 2,073 $ 1,939

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Details of Basic and Diluted Earnings Per Share (EPS) from Continuing Operations	The following table sets forth the details of basic and diluted earnings per share (“EPS”) from continuing operations: Three months ended September 30 In thousands, except per share 2019 2018 Income (loss) from continuing operations $ 8,643 $ (705 ) Weighted average common shares outstanding used in basic EPS 44,171 43,792 Effect of dilutive SOSARs, PSAs and RSUs 271 — Weighted average common shares outstanding and common share equivalents used in diluted EPS 44,442 43,792 Earnings (loss) per share from continuing operations Basic $ 0.19 $ (0.02 ) Diluted 0.19 (0.02 ) Nine months ended September 30 In thousands, except per share 2019 2018 Income from continuing operations $ 19,539 $ 2,841 Weighted average common shares outstanding used in basic EPS 44,113 43,754 Effect of dilutive SOSARs, PSAs and RSUs 292 — Weighted average common shares outstanding and common share equivalents used in diluted EPS 44,405 43,754 Earnings per share from continuing operations Basic $ 0.44 $ 0.06 Diluted 0.44 0.06
Number of Potential Common Shares that have been Excluded from Computation of Diluted Earnings Per Share for Indicated Period Due to Their Anti-Dilutive Nature	The following table sets forth potential common shares outstanding that were not included in the computation of diluted EPS for the periods indicated, because their effect would be anti-dilutive: September 30 In thousands 2019 2018 Three months ended 1,233 2,393 Nine months ended 1,233 2,393

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Losses)	The following table sets forth details of the changes in accumulated other comprehensive income (losses) for the three months and nine months ended September 30, 2019 and 2018. In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at July 1, 2019 $ (73,001 ) $ 4,442 $ (66,325 ) $ 1,148 $ (133,736 ) Other comprehensive income (loss) before reclassifications (net of tax) (17,073 ) 3,596 2,449 — (11,028 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,231 ) 592 (224 ) (863 ) Net current period other comprehensive income (loss) (17,073 ) 2,365 3,041 (224 ) (11,891 ) Balance at September 30, 2019 $ (90,074 ) $ 6,807 $ (63,284 ) $ 924 $ (145,627 ) Balance at July 1, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Other comprehensive income (loss) before reclassifications (net of tax) (3,217 ) 627 12,981 4,699 15,090 Amounts reclassified from accumulated other comprehensive income (net of tax) — 989 4,053 (161 ) 4,881 Net current period other comprehensive income (loss) (3,217 ) 1,616 17,034 4,538 19,971 Balance at September 30, 2018 $ (65,532 ) $ 271 $ (98,133 ) $ 8,759 $ (154,635 ) In thousands Currency translation adjustments Unrealized gain (loss) on cash flow hedges Change in pensions Change in other postretirement defined benefit plans Total Balance at January 1, 2019 $ (69,622 ) $ 2,199 $ (71,431 ) $ 1,414 $ (137,440 ) Other comprehensive income (loss) before reclassifications (net of tax) (20,452 ) 7,326 7,375 — (5,751 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — (2,718 ) 772 (490 ) (2,436 ) Net current period other comprehensive income (loss) (20,452 ) 4,608 8,147 (490 ) (8,187 ) Balance at September 30, 2019 $ (90,074 ) $ 6,807 $ (63,284 ) $ 924 $ (145,627 ) Balance at January 1, 2018 $ (41,839 ) $ (4,092 ) $ (98,295 ) $ 3,551 $ (140,675 ) Amount reclassified for adoption of ASU No. 2018-02 (23,297 ) 999 $ (22,298 ) Balance as adjusted at January 1, 2018 (41,839 ) (4,092 ) (121,592 ) 4,550 (162,973 ) Other comprehensive income (loss) before reclassifications (net of tax) (23,693 ) 778 12,981 4,699 (5,235 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 3,585 10,478 (490 ) 13,573 Net current period other comprehensive income (loss) (23,693 ) 4,363 23,459 4,209 8,338 Balance at September 30, 2018 $ (65,532 ) $ 271 $ (98,133 ) $ 8,759 $ (154,635 )
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income and Into the Condensed Consolidated Statements of Income	Reclassifications out of accumulated other comprehensive income and into the condensed consolidated statements of income were as follows: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Description Line Item in Statements of Income Cash flow hedges (Note 17) (Gains) losses on cash flow hedges $ (1,738 ) $ 1,344 $ (3,783 ) $ 4,939 Costs of products sold Tax expense (benefit) 507 (355 ) 1,065 (1,354 ) Income tax provision Net of tax (1,231 ) 989 (2,718 ) 3,585 Retirement plan obligations (Note 11) Amortization of deferred benefit pension plans Prior service costs 64 5 152 16 Other, net Actuarial losses 819 2,060 2,383 6,179 Other, net Discontinued operations amortization of defined benefit pension plans — 2,171 — 6,515 Discontinued operations Curtailment and Settlement recognition — 1,805 — 1,805 Discontinued operations 883 6,041 2,535 14,515 Tax benefit (291 ) (1,988 ) (1,763 ) (4,037 ) Income tax provision Net of tax 592 4,053 772 10,478 Amortization of deferred benefit other plans Prior service costs (2 ) — (7 ) — Other, net Actuarial gains (293 ) (16 ) (639 ) (49 ) Other, net Discontinued operations amortization of defined benefit other plans — (201 ) — (604 ) Discontinued operations (295 ) (217 ) (646 ) (653 ) Tax expense 71 56 156 163 Income tax provision Net of tax (224 ) (161 ) (490 ) (490 ) Total reclassifications, net of tax $ (863 ) $ 4,881 $ (2,436 ) $ 13,573

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction	The following table summarizes, by major jurisdiction, tax years that remain subject to examination: Open Tax Years Jurisdiction Examinations not yet initiated Examination in progress United States Federal 2016 - 2018 N/A State 2014 - 2018 N/A Canada (1) 2012-2013; 2018 2014 - 2017 Germany (1) 2016 - 2018 2012 - 2015 France 2018 N/A United Kingdom 2017 - 2018 N/A Philippines 2018 2016, 2017 (1) includes provincial or similar local jurisdictions, as applicable
Summary of Information Included in Continuing Operations Related to Interest and Penalties on Uncertain Tax Positions	The following table summarizes information included in continuing operations related to interest and penalties on uncertain tax positions: Nine months ended September 30 In millions 2019 2018 Interest expense (income) $ — $ 0.3 Penalties — — September 30 December 31 2019 2018 Accrued interest payable $ 1.1 $ 1.1

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Summary of Share Based Compensation Activity	The following table summarizes RSU and PSA activity during periods indicated: Units 2019 2018 Balance at January 1, 756,786 929,386 Granted 484,108 398,005 Forfeited (158,767 ) (73,673 ) Shares delivered (163,078 ) (151,371 ) Balance at September 30, 919,049 1,102,347
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Compensation Expense for Stock Option Activity Included in Continuing Operations	The following table sets forth aggregate RSU and PSA compensation expense included in continuing operations for the periods indicated: September 30 In thousands 2019 2018 Three months ended $ 1,048 $ 1,022 Nine months ended 2,643 4,283
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Summary of Share Based Compensation Activity	The following table sets forth information related to outstanding SOSARS: 2019 2018 SOSARS Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 2,334,742 $ 18.08 2,561,846 $ 17.87 Granted — — — — Exercised (441,920 ) 14.31 (158,545 ) 13.31 Canceled / forfeited (446,435 ) 21.06 (51,285 ) 22.35 Outstanding at September 30, 1,446,387 $ 19.31 2,352,016 $ 18.08
Compensation Expense for Stock Option Activity Included in Continuing Operations	The following table sets forth SOSAR compensation expense included in continuing operations for the periods indicated: September 30 In thousands 2019 2018 Three months ended $ — $ 67 Nine months ended 40 311

Retirement Plans and Other Po_2

Retirement Plans and Other Post-Retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Periodic Costs of Pension and Post Retirement Medical Benefit Plans Included in Continuing Operations	The following tables provide information with respect to the net periodic costs of our pension and post-retirement medical benefit plans included in continuing operations. Three months ended September 30 In thousands 2019 2018 Pension Benefits Service cost $ 216 $ 595 Interest cost 3,287 3,241 Expected return on plan assets (3,895 ) (5,531 ) Amortization of prior service cost 64 5 Amortization of unrecognized loss 819 2,060 Total net periodic benefit cost $ 491 $ 370 Other Benefits Service cost $ 7 $ 16 Interest cost 67 80 Amortization of prior service credit (2 ) — Amortization of actuarial gain (293 ) (16 ) Total net periodic benefit cost $ (221 ) $ 80 Nine months ended September 30 In thousands 2019 2018 Pension Benefits Service cost $ 1,073 $ 1,784 Interest cost 10,074 9,723 Expected return on plan assets (11,290 ) (16,592 ) Amortization of prior service cost 152 16 Amortization of unrecognized loss 2,383 6,179 Total net periodic benefit cost $ 2,392 $ 1,110 Other Benefits Service cost $ 25 $ 46 Interest cost 235 239 Amortization of prior service credit (7 ) — Amortization of actuarial gain (639 ) (49 ) Total net periodic benefit cost $ (386 ) $ 236

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories, Net of Reserves	Inventories, net of reserves, were as follows: September 30 December 31 In thousands 2019 2018 Raw materials $ 55,357 $ 50,205 In-process and finished 97,409 84,894 Supplies 37,808 38,312 Total $ 190,574 $ 173,411

Capitalized Interest (Tables)

Capitalized Interest (Tables)	9 Months Ended
	Sep. 30, 2019
Interest Expense [Abstract]
Summary of Interest Incurred, Capitalized and Expensed Included in Continuing Operations	The following table sets forth details of interest incurred, capitalized and expensed included in continuing operations: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Interest cost incurred $ 1,902 $ 3,965 $ 8,513 $ 11,633 Interest capitalized — — — 396 Interest expense $ 1,902 $ 3,965 $ 8,513 $ 11,237

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Summary of Minimum Lease Payments	The following table sets forth required minimum lease payments for the periods indicated: September 30 December 31 In thousands 2019 2018 2019 $ 1,342 $ 5,020 2020 4,502 3,861 2021 3,025 2,515 2022 1,583 1,426 2023 568 584 Thereafter 335 383

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt is summarized as follows: September 30 December 31 In thousands 2019 2018 Revolving credit facility, due Mar. 2020 $ — $ 114,495 Revolving credit facility, due Feb. 2024 79,490 — 5.375% Notes, due Oct. 2020 — 250,000 Term loan, due Feb. 2024 236,564 — 2.40% Term Loan, due Jun. 2022 4,278 5,725 2.05% Term Loan, due Mar. 2023 20,342 25,972 1.30% Term Loan, due Jun. 2023 5,834 7,361 1.55% Term Loan, due Sep. 2025 8,006 9,470 Total long-term debt 354,514 413,023 Less current portion (22,235 ) (10,785 ) Unamortized deferred issuance costs (2,508 ) (1,276 ) Long-term debt, net of current portion $ 329,771 $ 400,962
Summary of Debts Borrowed by Subsidiary	Glatfelter Gernsbach GmbH & Co. KG (“Gernsbach”), a wholly-owned subsidiary of ours, entered into a series of borrowing agreements with IKB Deutsche Industriebank AG, Düsseldorf (“IKB”) as summarized below: Amounts in thousands Original Principal Interest Rate Maturity Borrowing date Apr. 11, 2013 € 42,700 2.05 % Mar. 2023 Sep. 4, 2014 10,000 2.40 % Jun. 2022 Oct. 10, 2015 2,608 1.55 % Sep. 2025 Apr. 26, 2016 10,000 1.30 % Jun. 2023 May 4, 2016 7,195 1.55 % Sep. 2025

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Carrying Value and Fair Value of Long-Term Debt	The following table sets forth carrying value and fair value of long-term debt: September 30, 2019 December 31, 2018 In thousands Carrying Value Fair Value Carrying Value Fair Value Variable rate debt $ 79,490 $ 79,490 $ 114,495 $ 114,495 Fixed-rate bonds — — 250,000 249,010 Term loan, due Feb. 2024 236,564 236,564 — — 2.40% Term loan 4,278 4,371 5,725 5,836 2.05% Term loan 20,342 20,757 25,972 26,346 1.30% Term Loan 5,834 5,873 7,361 7,341 1.55% Term loan 8,006 8,142 9,470 9,453 Total $ 354,514 $ 355,197 $ 413,023 $ 412,481

Financial Derivatives and Hed_2

Financial Derivatives and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Values of Derivative Instruments	Fair Value Measurements The following table summarizes the fair values of derivative instruments for the period indicated and the line items in the accompanying condensed consolidated balance sheets where the instruments are recorded: In thousands September 30 2019 December 31 2018 September 30 2019 December 31 2018 Prepaid Expenses and Other Other Balance sheet caption Current Assets Current Liabilities Designated as hedging: Forward foreign currency exchange contracts $ 7,679 $ 4,381 $ 220 $ 1,548 Not designated as hedging: Forward foreign currency exchange contracts $ 343 $ 103 $ 320 $ 122
Income or (Loss) from Derivative Instruments Recognized in Results of Operations	The following table summarizes the amount of income or (loss) from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying condensed consolidated statements of income where the results are recorded: Three months ended September 30 Nine months ended September 30 In thousands 2019 2018 2019 2018 Designated as hedging: Forward foreign currency exchange contracts: Effective portion – cost of products sold $ 1,738 $ (1,344 ) $ 3,783 $ (4,939 ) Ineffective portion – other – net — 207 — (5 ) Not designated as hedging: Forward foreign currency exchange contracts: Other – net $ (511 ) $ (477 ) $ (483 ) $ (1,078 )
Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss) Before Taxes	A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income (loss), before taxes, is as follows: In thousands 2019 2018 Balance at January 1, $ 3,004 $ (5,640 ) Deferred gains on cash flow hedges 10,020 1,142 Reclassified to earnings (3,783 ) 4,939 Balance at September 30, $ 9,241 $ 441
Designated as Hedging [Member]
Outstanding Derivatives Used to Hedge Foreign Exchange Risks	We had the following outstanding derivatives that were used to hedge foreign exchange risks associated with forecasted transactions and designated as hedging instruments: In thousands September 30, 2019 December 31, 2018 Derivative Sell/Buy - sell notional Philippine Peso / British Pound — 13,140 Philippine Peso / Euro 6,784 16,446 Euro / British Pound 17,428 15,250 U.S. Dollar / Euro 6,859 88 U.S. Dollar / Canadian Dollar 1,850 — Sell/Buy - buy notional Euro / Philippine Peso 889,778 1,069,006 British Pound / Philippine Peso 1,083,507 980,137 Euro / U.S. Dollar 87,872 76,417 U.S. Dollar / Canadian Dollar 34,934 35,154 Canadian Dollar / U.S. Dollar 1,850 — British Pound / Euro — 216
Not Designated as Hedging [Member]
Outstanding Derivatives Used to Hedge Foreign Exchange Risks	The following sets forth derivatives used to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities: In thousands September 30, 2019 December 31, 2018 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 26,000 25,500 British Pound / Euro 3,000 2,000 Sell/Buy - buy notional Euro / U.S. Dollar 12,000 11,000 British Pound / Euro 9,000 8,000

Commitments, Contingencies an_2

Commitments, Contingencies and Legal Proceedings (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Schedule of Reserves	Our reserve for past and future government oversight costs and long-term monitoring and maintenance is set forth below: Nine months ended September 30 In thousands 2019 2018 Balance at January 1, $ 45,001 $ 43,144 Payments (20,771 ) (3,014 ) Reserve adjustment (2,509 ) — Assumption of WTM I escrow — 4,746 Accretion 141 115 Balance at September 30, $ 21,862 $ 44,991

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Schedule of Financial and Other Information by Segment	The following tables set forth financial and other information by segment for the period indicated: Three months ended September 30 Other and Dollars in millions Composite Fibers Airlaid Materials Unallocated Total 2019 2018 2019 2018 2019 2018 2019 2018 Net sales $ 127.7 $ 139.2 $ 104.8 $ 70.7 $ — $ — $ 232.5 $ 209.9 Cost of products sold 106.0 116.8 88.4 62.3 0.1 0.9 194.5 180.0 Gross profit (loss) 21.7 22.4 16.4 8.4 (0.1 ) (0.9 ) 38.0 29.9 SG&A 10.6 10.5 4.8 2.9 8.3 12.4 23.7 25.8 Gains on dispositions of plant, equipment and timberlands, net — — — — (0.2 ) (0.2 ) (0.2 ) (0.2 ) Total operating income (loss) 11.1 11.9 11.6 5.5 (8.2 ) (13.1 ) 14.5 4.3 Non-operating expense — — — — (2.8 ) (1.6 ) (2.8 ) (1.6 ) Income (loss) before income taxes $ 11.1 $ 11.9 $ 11.6 $ 5.5 $ (11.0 ) $ (14.7 ) $ 11.8 $ 2.8 Supplementary Data Net tons sold (thousands) 33.4 37.4 35.9 24.0 — — 69.3 61.5 Depreciation, depletion and amortization $ 6.4 $ 7.1 $ 5.3 $ 3.4 $ 0.9 $ 1.0 $ 12.6 $ 11.5 Capital expenditures 4.0 3.0 2.9 1.9 0.5 1.3 7.4 6.2 Nine months ended September 30 Other and Dollars in millions Composite Fibers Airlaid Materials Unallocated Total 2019 2018 2019 2018 2019 2018 2019 2018 Net sales $ 389.0 $ 423.7 $ 307.7 $ 213.1 $ — $ — $ 696.7 $ 636.8 Cost of products sold 322.2 349.5 262.3 184.7 1.1 2.8 585.6 537.1 Gross profit (loss) 66.8 74.2 45.4 28.4 (1.1 ) (2.8 ) 111.1 99.7 SG&A 31.4 34.0 13.4 8.1 26.3 39.8 71.1 81.9 Gains on dispositions of plant, equipment and timberlands, net — — — — (1.3 ) (1.9 ) (1.3 ) (1.9 ) Total operating income (loss) 35.4 40.2 32.0 20.3 (26.1 ) (40.8 ) 41.3 19.8 Non-operating expense — — — — (11.1 ) (9.9 ) (11.1 ) (9.9 ) Income (loss) before income taxes $ 35.4 $ 40.2 $ 32.0 $ 20.3 $ (37.2 ) $ (50.7 ) $ 30.2 $ 9.9 Supplementary Data Net tons sold (thousands) 99.4 110.4 103.1 72.4 — — 202.6 182.8 Depreciation, depletion and amortization $ 19.7 $ 21.7 $ 15.8 $ 9.7 $ 2.6 $ 3.3 $ 38.1 $ 34.7 Capital expenditures 8.7 10.9 7.9 17.6 1.4 3.7 18.0 32.2

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) $ in Millions	Sep. 30, 2019USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use asset	$ 11.1
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use asset	14.1
Lease obligation	$ 14.1

Acquisition - Additional Inform

Acquisition - Additional Information (Details)	Oct. 01, 2018USD ($)Employeet	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill		$ 146,093,000	$ 153,463,000
Intangible assets, net		83,129,000	$ 93,614,000
G P Business [Member]
Business Acquisition [Line Items]
Business acquisition purchase price	$ 186,000,000
Business acquisition, date of completion	Oct. 1, 2018
Post-closing purchase price adjustments	$ 2,000,000
Annual production capacity | t	32,000
Number of employees at manufacturing facility | Employee	220
Goodwill		74,770,000
Intangible assets, net		43,600,000
Goodwill deductible for tax purposes		$ 0

Acquisition - Summary of Alloca

Acquisition - Summary of Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Goodwill	$ 146,093	$ 153,463
G P Business [Member]
Assets
Cash and cash equivalents	7,540
Accounts receivable	13,277
Inventory	11,133
Prepaid and other current assets	869
Plant, equipment and timberlands	66,167
Intangible assets	43,573
Goodwill	74,770
Total assets	217,329
Liabilities
Accounts payable	8,577
Deferred tax liabilities	19,119
Other long term liabilities	1,162
Total liabilities	28,858
Total	188,471
less cash acquired	(7,540)
Total purchase price	$ 180,931

Acquisition - Summary of Unaudi

Acquisition - Summary of Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Acquisition Pro Forma Information [Abstract]
Net sales	$ 233,043	$ 707,563
Income from continuing operations	$ 2,463	$ 7,558
Income per share from continuing operations	$ 0.06	$ 0.17

Revenue - Summary of Disaggrega

Revenue - Summary of Disaggregated Information Pertaining to Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 232,515	$ 209,855	$ 696,701	$ 636,806
Product [Member]
Disaggregation Of Revenue [Line Items]
Net sales	232,515	209,855	696,701	636,806
Composite Fibers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	127,704	139,176	389,002	423,707
Composite Fibers [Member] | Europe, Middle East and Africa [Member]
Disaggregation Of Revenue [Line Items]
Net sales	77,012	87,870	234,928	274,442
Composite Fibers [Member] | Americas [Member]
Disaggregation Of Revenue [Line Items]
Net sales	33,179	30,205	98,783	83,245
Composite Fibers [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Net sales	17,513	21,101	55,291	66,020
Composite Fibers [Member] | Food & Beverage [Member]
Disaggregation Of Revenue [Line Items]
Net sales	66,637	68,534	208,480	209,117
Composite Fibers [Member] | Wallcovering [Member]
Disaggregation Of Revenue [Line Items]
Net sales	20,673	26,135	62,181	82,056
Composite Fibers [Member] | Technical Specialties [Member]
Disaggregation Of Revenue [Line Items]
Net sales	20,301	20,615	58,855	63,182
Composite Fibers [Member] | Composite Laminates [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,859	10,544	26,552	28,902
Composite Fibers [Member] | Metallized [Member]
Disaggregation Of Revenue [Line Items]
Net sales	11,234	13,348	32,934	40,450
Airlaid Materials [Member]
Disaggregation Of Revenue [Line Items]
Net sales	104,811	70,679	307,699	213,099
Airlaid Materials [Member] | Europe, Middle East and Africa [Member]
Disaggregation Of Revenue [Line Items]
Net sales	58,279	35,283	167,924	107,416
Airlaid Materials [Member] | Americas [Member]
Disaggregation Of Revenue [Line Items]
Net sales	45,039	34,899	134,634	104,027
Airlaid Materials [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,493	497	5,141	1,656
Airlaid Materials [Member] | Feminine Hygiene [Member]
Disaggregation Of Revenue [Line Items]
Net sales	52,159	46,054	158,998	141,464
Airlaid Materials [Member] | Specialty Wipes [Member]
Disaggregation Of Revenue [Line Items]
Net sales	17,994	11,104	52,982	29,366
Airlaid Materials [Member] | Table Top [Member]
Disaggregation Of Revenue [Line Items]
Net sales	19,179	2,091	48,857	6,335
Airlaid Materials [Member] | Adult Incontinence [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,855	5,036	17,708	14,658
Airlaid Materials [Member] | Home Care [Member]
Disaggregation Of Revenue [Line Items]
Net sales	4,857	4,009	13,173	11,911
Airlaid Materials [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 4,767	$ 2,385	$ 15,981	$ 9,365

Discontinued Operations - Addit

Discontinued Operations - Additional Information (Detail) - Specialty Papers [Member] $ in Millions	1 Months Ended
	Oct. 31, 2018USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Selling price of business	$ 360
Cash proceeds from divestiture of business	323
Retiree healthcare liabilities	38
Pension liabilities assumed	210
Related assets transferred from existing pension plan	$ 274

Discontinued Operations - Summa

Discontinued Operations - Summary of Discontinued Operations included in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Non-operating income (expense)
Income (loss) before income taxes	$ 1,062	$ (114,656)	$ 1,291	$ (128,714)
Income tax benefit	(2,519)	(19,530)	(2,511)	(28,361)
Income (loss) from discontinued operations	3,581	(95,126)	3,802	(100,353)
Specialty Papers [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		202,132		593,974
Costs of products sold		181,628		572,820
Gross profit		20,504		21,154
Selling, general and administrative expenses	(2,455)	6,058	(2,684)	18,566
Gains on dispositions of plant, equipment and timberlands, net		3		(440)
Operating income	2,455	14,443	2,684	3,028
Non-operating income (expense)
Interest expense		(2,281)		(6,017)
Other, net	(1,393)	(1,174)	(1,393)	(81)
Impairment charge		(125,644)		(125,644)
Income (loss) before income taxes	1,062	(114,656)	1,291	(128,714)
Income tax benefit	(2,519)	(19,530)	(2,511)	(28,361)
Income (loss) from discontinued operations	$ 3,581	(95,126)	$ 3,802	(100,353)
Specialty Papers [Member] | Product [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		201,288		590,757
Specialty Papers [Member] | Energy and Related Sales Net [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total revenues		$ 844		$ 3,217

Discontinued Operations - Sum_2

Discontinued Operations - Summary of Cash Flows from Discontinued Operations Included in Condensed Consolidated Statements of Cash Flows (Detail) - Specialty Papers [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net cash provided (used) by operating activities	$ (9,749)	$ 33,721
Net cash used by investing activities	(8,221)	(14,018)
Net cash provided by financing activities		125
Change in cash and cash equivalents from discontinued operations	$ (17,970)	$ 19,828

Gains on Disposition of Plant_3

Gains on Disposition of Plant, Equipment and Timberlands (Summary for Sale of Timberlands and Other Assets Included in Continuing Operations) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)a	Sep. 30, 2018USD ($)a	Sep. 30, 2019USD ($)a	Sep. 30, 2018USD ($)a
Property, Plant and Equipment [Line Items]
Proceeds			$ 1,363	$ 2,073
Gain	$ 235	$ 249	$ 1,327	$ 1,939
Timberlands [Member]
Property, Plant and Equipment [Line Items]
Acres | a	463	1,103	463	1,103
Proceeds			$ 1,147	$ 2,046
Gain			1,114	1,929
Other [Member]
Property, Plant and Equipment [Line Items]
Proceeds			216	27
Gain			$ 213	$ 10

Earnings Per Share - Details of

Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) from Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 8,643	$ (705)	$ 19,539	$ 2,841
Weighted average common shares outstanding used in basic EPS	44,171	43,792	44,113	43,754
Effect of dilutive SOSARs, PSAs and RSUs	271		292
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,442	43,792	44,405	43,754
Earnings (loss) per share from continuing operations
Basic	$ 0.19	$ (0.02)	$ 0.44	$ 0.06
Diluted	$ 0.19	$ (0.02)	$ 0.44	$ 0.06

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Loss From Discontinued Operations Net Of Tax [Abstract]
Income	$ 3,581	$ (95,126)	$ 3,802	$ (100,353)

Earnings Per Share - Number of

Earnings Per Share - Number of Potential Common Shares that have been Excluded from Computation of Diluted Earnings Per Share for Indicated Period Due to Their Anti-Dilutive Nature (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Potential common shares	1,233	2,393	1,233	2,393

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (133,736)	$ (174,606)	$ (137,440)	$ (140,675)
Amount reclassified for adoption of ASU No. 2018-02				(22,298)
Balance as adjusted at January 1, 2018				(162,973)
Other comprehensive income (loss) before reclassifications (net of tax)	(11,028)	15,090	(5,751)	(5,235)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(863)	4,881	(2,436)	13,573
Net current period other comprehensive income (loss)	(11,891)	19,971	(8,187)	8,338
Ending Balance	(145,627)	(154,635)	(145,627)	(154,635)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(73,001)	(62,315)	(69,622)	(41,839)
Balance as adjusted at January 1, 2018				(41,839)
Other comprehensive income (loss) before reclassifications (net of tax)	(17,073)	(3,217)	(20,452)	(23,693)
Net current period other comprehensive income (loss)	(17,073)	(3,217)	(20,452)	(23,693)
Ending Balance	(90,074)	(65,532)	(90,074)	(65,532)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,442	(1,345)	2,199	(4,092)
Balance as adjusted at January 1, 2018				(4,092)
Other comprehensive income (loss) before reclassifications (net of tax)	3,596	627	7,326	778
Amounts reclassified from accumulated other comprehensive income (net of tax)	(1,231)	989	(2,718)	3,585
Net current period other comprehensive income (loss)	2,365	1,616	4,608	4,363
Ending Balance	6,807	271	6,807	271
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(66,325)	(115,167)	(71,431)	(98,295)
Amount reclassified for adoption of ASU No. 2018-02				(23,297)
Balance as adjusted at January 1, 2018				(121,592)
Other comprehensive income (loss) before reclassifications (net of tax)	2,449	12,981	7,375	12,981
Amounts reclassified from accumulated other comprehensive income (net of tax)	592	4,053	772	10,478
Net current period other comprehensive income (loss)	3,041	17,034	8,147	23,459
Ending Balance	(63,284)	(98,133)	(63,284)	(98,133)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,148	4,221	1,414	3,551
Amount reclassified for adoption of ASU No. 2018-02				999
Balance as adjusted at January 1, 2018				4,550
Other comprehensive income (loss) before reclassifications (net of tax)		4,699		4,699
Amounts reclassified from accumulated other comprehensive income (net of tax)	(224)	(161)	(490)	(490)
Net current period other comprehensive income (loss)	(224)	4,538	(490)	4,209
Ending Balance	$ 924	$ 8,759	$ 924	$ 8,759

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income and Into the Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	$ (194,494)	$ (179,983)	$ (585,563)	$ (537,073)
Other, net	1,034	(2,253)	3,547	(1,131)
Income tax provision (benefit)	3,141	3,462	10,654	7,037
Net income (loss)	12,224	(95,831)	23,341	(97,512)
Income (loss)	3,581	(95,126)	3,802	(100,353)
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net income (loss)	(863)	4,881	(2,436)	13,573
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	883	6,041	2,535	14,515
Income tax provision (benefit)	(291)	(1,988)	(1,763)	(4,037)
Net income (loss)	592	4,053	772	10,478
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	64	5	152	16
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	819	2,060	2,383	6,179
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Discontinued Operations Amortization of Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Income (loss)		2,171		6,515
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Curtailment and Settlement Recognition [Member]
Defined Benefit Plan Disclosure [Line Items]
Income (loss)		1,805		1,805
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	(295)	(217)	(646)	(653)
Income tax provision (benefit)	71	56	156	163
Net income (loss)	(224)	(161)	(490)	(490)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Other Pension Plan [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	(2)		(7)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Other Pension Plan [Member] | Discontinued Operations Amortization of Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Income (loss)		(201)		(604)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Other Pension Plan [Member] | Actuarial Gains [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	(293)	(16)	(639)	(49)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Accumulated Net (Gain) Loss from Cash Flow Hedges Attributable to Parent [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	(1,738)	1,344	(3,783)	4,939
Income tax provision (benefit)	507	(355)	1,065	(1,354)
Net income (loss)	$ (1,231)	$ 989	$ (2,718)	$ 3,585

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Increase in effective tax rate due to GILTI provisions	6.00%
Valuation allowance	$ 0.3
Gross unrecognized tax benefits	29.5	$ 29.6
Unrecognized tax benefits that would impact effective tax rate	$ 18.6
Maximum [Member]
Income Tax Contingency [Line Items]
Percentage of deduction in GILTI Income	50.00%
Gross unrecognized tax benefits balance may decrease within the next twelve months	$ 4.3
Minimum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	$ 0

Income Taxes - Summary of Tax Y

Income Taxes - Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction (Detail)	9 Months Ended
	Sep. 30, 2019
Canada [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
France [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Philippines [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Minimum [Member] | United States [Member] | United States - Federal [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Minimum [Member] | United States [Member] | United States - State [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2014
Minimum [Member] | Canada [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2012
Examination in progress	2014
Minimum [Member] | Germany [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Examination in progress	2012
Minimum [Member] | United Kingdom [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2017
Minimum [Member] | Philippines [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examination in progress	2016
Maximum [Member] | United States [Member] | United States - Federal [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Maximum [Member] | United States [Member] | United States - State [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Maximum [Member] | Canada [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013
Examination in progress	2017
Maximum [Member] | Germany [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Examination in progress	2015
Maximum [Member] | United Kingdom [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2018
Maximum [Member] | Philippines [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Examination in progress	2017

Income Taxes - Summary of Infor

Income Taxes - Summary of Information Included in Continuing Operations Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Interest expense (income)	$ 0.3
Accrued interest payable		$ 1.1	$ 1.1

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - shares	9 Months Ended		45 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Restricted Stock Units (RSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The vesting graded scale	The RSUs vest on the passage of time, generally on a graded scale over a three, four, and five-year period, or in certain instances the RSUs were issued with five-year cliff vesting.
Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative performance targets	2 years
Additional service period	1 year
Grants under performance share awards	218,422	184,121
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock	3 years
Vesting term	10 years
Share-based payment award, shares issued in period			0

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of RSU and PSA Activity (Detail) - Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member] - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	756,786	929,386
Granted	484,108	398,005
Forfeited	(158,767)	(73,673)
Shares delivered	(163,078)	(151,371)
Ending Balance	919,049	1,102,347

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense for Periods Included in Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,048	$ 1,022	$ 2,643	$ 4,283
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 67	$ 40	$ 311

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - Stock Only Stock Appreciation Rights (SOSARs) [Member] - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Outstanding	2,334,742	2,561,846
Exercised	(441,920)	(158,545)
Canceled / forfeited	(446,435)	(51,285)
Ending Balance, Outstanding	1,446,387	2,352,016
Beginning Balance, Weighted Average Exercise Price, Outstanding	$ 18.08	$ 17.87
Weighted Average Exercise Price, Exercised	14.31	13.31
Weighted Average Exercise Price, Canceled / forfeited	21.06	22.35
Ending Balance, Weighted Average Exercise Price, Outstanding	$ 19.31	$ 18.08

Retirement Plans and Other Po_3

Retirement Plans and Other Post-Retirement Benefits - Schedule of Net Periodic Costs of Pension and Post Retirement Medical Benefit Plans Included in Continuing Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 216	$ 595	$ 1,073	$ 1,784
Interest cost	3,287	3,241	10,074	9,723
Expected return on plan assets	(3,895)	(5,531)	(11,290)	(16,592)
Amortization of prior service cost/(credit)	64	5	152	16
Amortization of unrecognized/actuarial loss (gain)	819	2,060	2,383	6,179
Total net periodic benefit cost	491	370	2,392	1,110
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	16	25	46
Interest cost	67	80	235	239
Amortization of prior service cost/(credit)	(2)		(7)
Amortization of unrecognized/actuarial loss (gain)	(293)	(16)	(639)	(49)
Total net periodic benefit cost	$ (221)	$ 80	$ (386)	$ 236

Retirement Plans and Other Po_4

Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) $ in Millions	3 Months Ended
	Jun. 30, 2019USD ($)
Compensation And Retirement Disclosure [Abstract]
Gain from remeasurement of pension liability due to termination	$ 1.9

Inventories - Inventories, Net

Inventories - Inventories, Net of Reserves (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 55,357	$ 50,205
In-process and finished	97,409	84,894
Supplies	37,808	38,312
Total	$ 190,574	$ 173,411

Capitalized Interest - Summary

Capitalized Interest - Summary of Interest Incurred, Capitalized and Expensed Included in Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest Expense [Abstract]
Interest cost incurred	$ 1,902	$ 3,965	$ 8,513	$ 11,633
Interest capitalized				396
Interest expense	$ 1,902	$ 3,965	$ 8,513	$ 11,237

Leases - Additional Information

Leases - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)
Leases [Abstract]
Right of use assets and lease obligation	$ 11.1
Weighted average remaining maturity	36 months
Weighted average discount rate	3.02%
Operating lease expense	$ 4.4

Leases - Summary of Minimum Lea

Leases - Summary of Minimum Lease Payments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 1,342	$ 5,020
2020	4,502	3,861
2021	3,025	2,515
2022	1,583	1,426
2023	568	584
Thereafter	$ 335	$ 383

Long-Term Debt - Summary of Lon

Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 354,514	$ 413,023
Less current portion	(22,235)	(10,785)
Unamortized deferred issuance costs	(2,508)	(1,276)
Long-term debt, net of current portion	329,771	400,962
Revolving Credit Facility, Due Mar. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt		114,495
Revolving Credit Facility, Due Feb. 2024 [Member]
Debt Instrument [Line Items]
Total long-term debt	79,490
5.375% Notes, Due Oct. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt		250,000
2.40% Term Loan, Due Jun. 2022 [Member]
Debt Instrument [Line Items]
Total long-term debt	4,278	5,725
Term Loan, Due Feb. 2024 [Member]
Debt Instrument [Line Items]
Total long-term debt	236,564
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	20,342	25,972
1.30% Term Loan, Due Jun. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	5,834	7,361
1.55% Term Loan, Due Sep. 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 8,006	$ 9,470

Long-Term Debt - Summary of L_2

Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2019	Jul. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 8, 2024
Interest rate on debt		1.25%
5.375% Notes, Due Oct. 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Oct. 31, 2020
Interest rate on debt	5.375%		5.375%
2.40% Term Loan, Due Jun. 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Jun. 30, 2022
Interest rate on debt	2.40%		2.40%
Term Loan, Due Feb. 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 29, 2024
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Mar. 31, 2023
Interest rate on debt	2.05%		2.05%
1.30% Term Loan, Due Jun. 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Jun. 30, 2023
Interest rate on debt	1.30%		1.30%
1.55% Term Loan, Due Sep. 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Sep. 30, 2025
Interest rate on debt	1.55%		1.55%
Revolving Credit Facility, Due Mar. 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Mar. 31, 2020
Revolving Credit Facility, Due Feb. 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Feb. 29, 2024

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019USD ($)	Oct. 31, 2019EUR (€)	Sep. 30, 2019EUR (€)	Jul. 01, 2019	Feb. 08, 2019USD ($)	Feb. 08, 2019EUR (€)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €				€ 220,000,000
Pre-tax gain from changes in currency exchange rates | $		$ 9,000,000
Interest rate on debt					1.25%
Debt instrument covenant compliance leverage ratio, threshold		4
Debt instrument covenant compliance leverage ratio, actual		2.9
Long-term debt, maturity date		Feb. 8, 2024
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt instrument covenant compliance leverage ratio, threshold	4.5
Floating-to-fixed Interest Rate Swap Agreement [Member] | Scenario, Forecast [Member]
Debt Instrument [Line Items]
Derivative notional amount | €			€ 180,000,000
Derivative fixed interest rate			0.0395%
Loans variable rate of interest | €			€ 180,000,000
Minimum [Member] | Scenario, Forecast [Member]
Debt Instrument [Line Items]
Long-term debt percentage bearing fixed Interest rate			0.00%
Term Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €							€ 220,000,000
5.375% Notes [Member]
Debt Instrument [Line Items]
Interest rate on debt		5.375%		5.375%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | $						$ 400,000,000
Federal fund rate spread		1.00%
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		0.125%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		1.00%
Revolving Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Federal fund rate spread		0.50%
Revolving Credit Facility [Member] | Euro Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		1.125%
Revolving Credit Facility [Member] | Euro Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		2.00%
Revolving Credit Facility [Member] | EURIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		1.125%
Revolving Credit Facility [Member] | EURIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Federal fund rate spread		2.00%
Letters of Credit [Member]
Debt Instrument [Line Items]
Letters of credit issued | $		$ 7,400,000						$ 5,200,000
Letters of credit outstanding | $		$ 0

Long-Term Debt - Summary of Deb

Long-Term Debt - Summary of Debts Borrowed by Subsidiary (Detail) - EUR (€) € in Thousands	May 04, 2016	Apr. 26, 2016	Oct. 10, 2015	Sep. 04, 2014	Apr. 11, 2013	Sep. 30, 2019	Jul. 01, 2019
Debt Instrument [Line Items]
Interest Rate							1.25%
Maturity						Feb. 8, 2024
IKB Deutsche Industriebank AG Borrowing Agreements [Member] | Glatfelter Gernsbach GmbH and Co KG [Member] | IKB Deutsche Industriebank AG Member
Debt Instrument [Line Items]
Original Principal	€ 7,195	€ 10,000	€ 2,608	€ 10,000	€ 42,700
Interest Rate	1.55%	1.30%	1.55%	2.40%	2.05%
Maturity	Sep. 30, 2025	Jun. 30, 2023	Sep. 30, 2025	Jun. 30, 2022	Mar. 31, 2023

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 354,514	$ 413,023
Fair Value	355,197	412,481
Revolving Credit Facility Due Mar. 2020 And Nov. 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	79,490	114,495
Fair Value	79,490	114,495
5.375% Notes, Due Oct. 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value		250,000
Fair Value		249,010
Term Loan, Due Feb. 2024 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	236,564
Fair Value	236,564
2.40% Term Loan, Due Jun. 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	4,278	5,725
Fair Value	4,371	5,836
2.05% Term Loan, Due Mar. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	20,342	25,972
Fair Value	20,757	26,346
1.30% Term Loan, Due Jun. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	5,834	7,361
Fair Value	5,873	7,341
1.55% Term Loan, Due Sep. 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	8,006	9,470
Fair Value	$ 8,142	$ 9,453

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Parenthetical) (Detail)	Sep. 30, 2019	Jul. 01, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent on aggregate principal amount of outstanding		1.25%
2.40% Term Loan, Due Jun. 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent on aggregate principal amount of outstanding	2.40%		2.40%
2.05% Term Loan, Due Mar. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent on aggregate principal amount of outstanding	2.05%		2.05%
1.30% Term Loan, Due Jun. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent on aggregate principal amount of outstanding	1.30%		1.30%
1.55% Term Loan, Due Sep. 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent on aggregate principal amount of outstanding	1.55%		1.55%

Financial Derivatives and Hed_3

Financial Derivatives and Hedging Activities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019
Maximum [Member] | Fair Value, Measurements [Member]
Derivative [Line Items]
Accumulated other comprehensive income realization period	18 months
Minimum [Member] | Fair Value, Measurements [Member]
Derivative [Line Items]
Accumulated other comprehensive income realization period	12 months
Designated as Hedging [Member] | Cash Flow Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts	18 months
Designated as Hedging [Member] | Cash Flow Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts	1 month
Not Designated as Hedging [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts	1 month

Financial Derivatives and Hed_4

Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Sep. 30, 2019USD ($)	Sep. 30, 2019EUR (€)	Sep. 30, 2019PHP (₱)	Sep. 30, 2019CAD ($)	Sep. 30, 2019GBP (£)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018PHP (₱)	Dec. 31, 2018CAD ($)	Dec. 31, 2018GBP (£)
Cash Flow Hedges [Member] | Philippine Peso / British Pound [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱								₱ 13,140,000
Cash Flow Hedges [Member] | Euro / British Pound [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €		€ 17,428,000					€ 15,250,000
Cash Flow Hedges [Member] | Philippine Peso Euro [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱			₱ 6,784,000					16,446,000
Cash Flow Hedges [Member] | Euro / Philippine Peso [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱			889,778,000					1,069,006,000
Cash Flow Hedges [Member] | British Pound / Philippine Peso [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱			₱ 1,083,507,000					₱ 980,137,000
Cash Flow Hedges [Member] | U.S. Dollar / Canadian Dollar [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 1,850,000
Cash Flow Hedges [Member] | U.S. Dollar / Canadian Dollar [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount				$ 34,934,000					$ 35,154,000
Cash Flow Hedges [Member] | Euro / U.S. Dollar [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	87,872,000					$ 76,417,000
Cash Flow Hedges [Member] | Canadian Dollar / U.S. Dollar [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	1,850,000
Cash Flow Hedges [Member] | U.S Dollar / Euro [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	6,859,000					88,000
Cash Flow Hedges [Member] | British Pound / Euro [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €							216,000
Foreign Currency Hedges [Member] | Euro / U.S. Dollar [Member] | Not Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	12,000,000					11,000,000
Foreign Currency Hedges [Member] | British Pound / Euro [Member] | Not Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 3,000,000					£ 2,000,000
Foreign Currency Hedges [Member] | British Pound / Euro [Member] | Not Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €		€ 9,000,000					€ 8,000,000
Foreign Currency Hedges [Member] | U.S. Dollar / British Pound [Member] | Not Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 26,000,000					$ 25,500,000

Financial Derivatives and Hed_5

Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	$ 7,679	$ 4,381
Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	220	1,548
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	343	103
Not Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	$ 320	$ 122

Financial Derivatives and Hed_6

Financial Derivatives and Hedging Activities - Income or (Loss) from Derivative Instruments Recognized in Results of Operations (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Costs of Products Sold [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Effective portion of derivative instruments, gain (loss)	$ 1,738	$ (1,344)	$ 3,783	$ (4,939)
Other - Net [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Ineffective portion of derivative instruments, gain (loss)		207		(5)
Other - Net [Member] | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ (511)	$ (477)	$ (483)	$ (1,078)

Financial Derivatives and Hed_7

Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss) Before Taxes (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Balance at January 1,	$ 3,004	$ (5,640)
Deferred gains on cash flow hedges	10,020	1,142
Reclassified to earnings	(3,783)	4,939
Balance at September 30,	$ 9,241	$ 441

Commitments, Contingencies an_3

Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)Operable_Unit	Dec. 31, 2018USD ($)
Commitments Contingencies And Litigation [Line Items]
Number of operable units | Operable_Unit	5
Term of agreement wih third party for monitoring and maintenance in OU1-OU4a	30 years
Difference recorded in escrow account	$ 2,000
Reserve for Environmental liabilities, current portion	7,700	$ 23,000
Reserve adjustment	(2,509)
Selling, General and Administrative Expense [Member]
Commitments Contingencies And Litigation [Line Items]
Reserve adjustment	2,500
Other Long-Term Liabilities [Member]
Commitments Contingencies And Litigation [Line Items]
Reserve for Environmental liabilities, remaining portion	$ 14,200
Minimum [Member] | December 2009 - Long Term Monitoring Plan [Member]
Commitments Contingencies And Litigation [Line Items]
Period over which cash expenditure to be incurred for monitoring activities	30 years
Glatfelter Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Governments unreimbursed past costs paid	$ 20,500
Georgia Pacific [Member]
Commitments Contingencies And Litigation [Line Items]
Settlement payable amount	$ 9,500
Payment due date	2017-08
OU2-5 [Member]
Commitments Contingencies And Litigation [Line Items]
Expected cleanup work continuation year	through 2019

Commitments, Contingencies an_4

Commitments, Contingencies and Legal Proceedings - Schedule of Reserves (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Environmental Remediation Obligations [Abstract]
Beginning balance	$ 45,001	$ 43,144
Payments	(20,771)	(3,014)
Reserve adjustment	(2,509)
Assumption of WTM I escrow		4,746
Accretion	141	115
Ending balance	$ 21,862	$ 44,991

Segment Information - Schedule

Segment Information - Schedule of Financial and Other Information by Segment (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)T	Sep. 30, 2018USD ($)T	Sep. 30, 2019USD ($)T	Sep. 30, 2018USD ($)T
Segment Reporting Information [Line Items]
Net sales	$ 232,515	$ 209,855	$ 696,701	$ 636,806
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 194,494	$ 179,983	$ 585,563	$ 537,073
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 38,021	$ 29,872	$ 111,138	$ 99,733
SG&A	23,721	25,799	71,143	81,915
Gains on dispositions of plant,equipment and timberlands, net	(235)	(249)	(1,327)	(1,939)
Operating income	14,535	4,322	41,322	19,757
Non-operating expense	(2,751)	(1,565)	(11,129)	(9,879)
Income from continuing operations before income taxes	$ 11,784	$ 2,757	$ 30,193	$ 9,878
Supplementary Data
Net tons sold | T	69,300	61,500	202,600	182,800
Depreciation, depletion and amortization	$ 12,600	$ 11,500	$ 38,114	$ 34,731
Capital expenditures	7,400	6,200	18,000	32,200
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales	127,704	$ 139,176	389,002	$ 423,707
Type of Revenue [Extensible List]		us-gaap:ProductMember		us-gaap:ProductMember
Cost of products sold	106,000	$ 116,800	322,200	$ 349,500
Type of Cost, Good or Service [Extensible List]		us-gaap:ProductMember		us-gaap:ProductMember
Gross profit	21,700	$ 22,400	66,800	$ 74,200
SG&A	10,600	10,500	31,400	34,000
Operating income	11,100	11,900	35,400	40,200
Income from continuing operations before income taxes	$ 11,100	$ 11,900	$ 35,400	$ 40,200
Supplementary Data
Net tons sold | T	33,400	37,400	99,400	110,400
Depreciation, depletion and amortization	$ 6,400	$ 7,100	$ 19,700	$ 21,700
Capital expenditures	4,000	3,000	8,700	10,900
Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales	$ 104,811	$ 70,679	$ 307,699	$ 213,099
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 88,400	$ 62,300	$ 262,300	$ 184,700
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ 16,400	$ 8,400	$ 45,400	$ 28,400
SG&A	4,800	2,900	13,400	8,100
Operating income	11,600	5,500	32,000	20,300
Income from continuing operations before income taxes	$ 11,600	$ 5,500	$ 32,000	$ 20,300
Supplementary Data
Net tons sold | T	35,900	24,000	103,100	72,400
Depreciation, depletion and amortization	$ 5,300	$ 3,400	$ 15,800	$ 9,700
Capital expenditures	$ 2,900	$ 1,900	$ 7,900	$ 17,600
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of products sold	$ 100	$ 900	$ 1,100	$ 2,800
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit	$ (100)	$ (900)	$ (1,100)	$ (2,800)
SG&A	8,300	12,400	26,300	39,800
Gains on dispositions of plant,equipment and timberlands, net	(200)	(200)	(1,300)	(1,900)
Operating income	(8,200)	(13,100)	(26,100)	(40,800)
Non-operating expense	(2,800)	(1,600)	(11,100)	(9,900)
Income from continuing operations before income taxes	(11,000)	(14,700)	(37,200)	(50,700)
Supplementary Data
Depreciation, depletion and amortization	900	1,000	2,600	3,300
Capital expenditures	$ 500	$ 1,300	$ 1,400	$ 3,700