Magnera (MAGN) 10-Q 31 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	GLT
Entity Registrant Name	GLATFELTER P H CO
Entity Central Index Key	41,719
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,779,112

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total revenues	$ 406,717	$ 388,323	$ 818,792	$ 780,165
Costs of products sold	$ 385,114	$ 358,588	$ 748,283	$ 694,801
Type of Cost, Good or Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit (loss)	$ 21,603	$ 29,735	$ 70,509	$ 85,364
Selling, general and administrative expenses	31,561	31,545	68,624	66,422
(Gains) losses on dispositions of plant, equipment and timberlands, net	(579)	(58)	(2,133)	(26)
Operating income (loss)	(9,379)	(1,752)	4,018	18,968
Non-operating income (expense)
Interest expense	(5,814)	(4,476)	(11,009)	(8,484)
Interest income	26	45	80	158
Other, net	(257)	98	(28)	910
Total non-operating expense	(6,045)	(4,333)	(10,957)	(7,416)
Income (loss) before income taxes	(15,424)	(6,085)	(6,939)	11,552
Income tax provision (benefit)	(8,025)	(371)	(5,256)	5,663
Net income (loss)	$ (7,399)	$ (5,714)	$ (1,683)	$ 5,889
Earnings (loss) per share
Basic	$ (0.17)	$ (0.13)	$ (0.04)	$ 0.14
Diluted	(0.17)	(0.13)	(0.04)	0.13
Cash dividends declared per common share	$ 0.13	$ 0.13	$ 0.26	$ 0.26
Weighted average shares outstanding
Basic	43,770	43,604	43,735	43,593
Diluted	43,770	43,604	43,735	44,449
Product [Member]
Total revenues	$ 405,773	$ 387,342	$ 816,420	$ 778,055
Energy and Related Sales Net [Member]
Total revenues	$ 944	$ 981	$ 2,372	$ 2,110

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (7,399)	$ (5,714)	$ (1,683)	$ 5,889
Foreign currency translation adjustments	(33,223)	27,504	(20,476)	33,569
Net change in:
Deferred losses on cash flow hedges, net of taxes of $(1,719), $1,632, $(1,632) and $1,920, respectively	4,549	(3,651)	2,747	(4,597)
Unrecognized retirement obligations, net of taxes of $(965), $(1,430), $(1,942) and $(2,677), respectively	3,021	2,479	6,096	4,553
Other comprehensive income (loss)	(25,653)	26,332	(11,633)	33,525
Comprehensive income (loss)	$ (33,052)	$ 20,618	$ (13,316)	$ 39,414

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Taxes on deferred losses on cash flow hedges	$ (1,719)	$ 1,632	$ (1,632)	$ 1,920
Taxes on unrecognized retirement obligations	$ (965)	$ (1,430)	$ (1,942)	$ (2,678)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 107,189	$ 116,219
Accounts receivable, net	188,099	174,154
Inventories	270,995	252,064
Prepaid expenses and other current assets	38,042	42,534
Total current assets	604,325	584,971
Plant, equipment and timberlands, net	844,467	865,743
Goodwill	80,450	82,744
Intangible assets, net	54,752	58,859
Other assets	153,103	138,478
Total assets	1,737,097	1,730,795
Liabilities and Shareholders' Equity
Current portion of long-term debt	10,982	11,298
Accounts payable	193,138	190,478
Dividends payable	5,696	5,678
Environmental liabilities	26,000	28,500
Other current liabilities	101,059	111,222
Total current liabilities	336,875	347,176
Long-term debt	510,177	470,098
Deferred income taxes	76,064	83,571
Other long-term liabilities	127,029	121,022
Total liabilities	1,050,145	1,021,867
Commitments and contingencies
Shareholders’ equity
Common stock	544	544
Capital in excess of par value	62,827	62,594
Retained earnings	957,643	948,411
Accumulated other comprehensive loss	(174,606)	(140,675)
Shareholders' equity before treasury stock	846,408	870,874
Less cost of common stock in treasury	(159,456)	(161,946)
Total shareholders’ equity	686,952	708,928
Total liabilities and shareholders’ equity	$ 1,737,097	$ 1,730,795

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income (loss)	$ (1,683)	$ 5,889
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	39,511	34,967
Amortization of debt issue costs and original issue discount	580	578
Pension expense, net of unfunded benefits paid	2,788	2,512
Deferred income tax benefit (provision)	(12,268)	1,824
Gains on dispositions of plant, equipment and timberlands, net	(2,133)	(26)
Share-based compensation	3,830	2,956
Change in operating assets and liabilities
Accounts receivable	(16,606)	(12,511)
Inventories	(23,352)	(4,750)
Prepaid and other current assets	(506)	(1,711)
Accounts payable	14,679	7,044
Accruals and other current liabilities	(3,799)	(6,399)
Other	(1,003)	(1,609)
Net cash provided by operating activities	38	28,764
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(36,944)	(71,047)
Proceeds from disposals of plant, equipment and timberlands, net	2,384	83
Other	(68)
Net cash used by investing activities	(34,628)	(70,964)
Financing activities
Net borrowings under revolving credit facility	46,660	68,236
Repayment of term loans	(5,647)	(4,528)
Payments of dividends	(11,368)	(11,130)
Proceeds from government grants	125
Payments related to share-based compensation awards and other	(980)	(112)
Net cash provided by financing activities	28,790	52,466
Effect of exchange rate changes on cash	(3,230)	3,732
Net increase (decrease) in cash and cash equivalents	(9,030)	13,998
Cash and cash equivalents at the beginning of period	116,219	55,444
Cash and cash equivalents at the end of period	107,189	69,442
Cash paid for:
Interest, net of amounts capitalized	10,349	7,810
Income taxes, net	$ 6,804	$ 4,193

Organization

Organization	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1. ORGANIZATION P. H. Glatfelter Company and subsidiaries (“Glatfelter”) is a manufacturer of specialty papers and fiber-based engineered materials. Headquartered in York, PA, U.S. operations include facilities in Fort Smith, AR, Spring Grove, PA and Chillicothe and Fremont, OH. International operations include facilities in Canada, Germany, France, the United Kingdom and the Philippines, and sales and distribution offices in the U.S., Russia and China. The terms “we,” “us,” “our,” “the Company,” or “Glatfelter,” refer to P. H. Glatfelter Company and subsidiaries unless the context indicates otherwise. Our products are marketed worldwide, either through wholesale paper merchants, brokers and agents, or directly to customers.

Accounting Policies

Accounting Policies	6 Months Ended
	Jun. 30, 2018
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 that you have read the audited consolidated financial statements included in our 2017 Annual Report on Form 10-K. Reclassification As a result of adopting the provisions of Accounting Standards Update (“ASU”) No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Cost we reclassified certain amounts of periodic benefit expense for previously reported periods from Cost of products sold and Selling, general and administrative expense to Non Operating Expense. As a result of applying the ASU, Costs of products sold for the second quarter of 2017 was increased by $0.7 million and Selling, general and administrative expenses were reduced by $0.4 million and the offsetting net reclassification reduced Non-operating expense by $0.3 million. The comparable amounts for the first six months of 2017 were $2.0 million, $0.7 million and $1.3 million, respectively. 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 that actual results may differ from those estimates and assumptions. Revenue Recognition We adopted ASU No. 2014-09, Revenue from Contracts with Customers in the first quarter of 2018. This ASU clarifies the principles for recognizing revenue and establishes expanded disclosure requirements; however, the adoption of ASU No. 2014-09 had no impact on the timing or amount of revenue recognized for any period presented. Refer to Note 4 for additional information about the disaggregation of our net sales. Our revenue is earned primarily from the manufacture and sale of specialty papers and engineered materials (“product sales”). Revenue is earned pursuant to contracts, supply agreements and other arrangements with a wide variety of customers. Our performance obligation is to produce a specified product according to technical specifications and, in substantially all instances, to deliver the product. Revenue from product sales is earned at a point in time. We recognize revenue on product sales when we have satisfied our performance obligation and control of the product has passed to the customer thereby entitling us to payment. With respect to substantially all arrangements for product sales, this is deemed to occur when title transfers in accordance with specified shipping terms. The prices are fixed at the time the sales arrangement is entered into and payment terms are customary for similar arrangements in our industry. Many of our agreements include customary provisions for volume rebates, discounts and similar incentives. In addition, we are obligated for products that fail to meet agreed upon specification. Provisions for such items are estimated and recorded as sales deductions in the period in which the related revenue is recognized. Revenue from power sales and renewable energy credits is recorded under the caption “Energy and related sales, net” in the condensed consolidated statements of income and is recognized upon fulfillment of our performance obligation which is generally upon meeting capacity commitments or delivery of REC certificates. Revenue from energy sales is recognized when electricity is delivered to the customer. Prices for power sales and renewable energy credits are fixed at the time of sale and payment is generally due within normal terms and conditions customary for the industry. Certain costs associated with the production of electricity, such as fuel, labor, depreciation and maintenance are netted against energy sales for presentation on the condensed consolidated statements of income. Recently Issued Accounting Pronouncements In February 2018, the FASB issued ASU No. 2018-02, “Reclassification of Certain Tax Effects From Accumulated Other Comprehensive Income. (“ASU No. 2018-02” ).” In December 2017, Tax Cuts and Jobs Act (“TCJA”) was passed into law and, among other provisions, reduced the statutory federal tax rate from 35% to 21%. The change in the tax rate impacted the carrying value of deferred tax assets and liabilities. ASU No. 2018-02 allows a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for stranded tax effects resulting from the TCJA. We elected to adopt ASU No. 2018-02 in the first quarter of 2018, and we reclassified $22.3 million of net deferred tax benefits from AOCI to retained earnings. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In August 2017, the FASB issued ASU No. 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities"

Proposed Acquisition

Proposed Acquisition	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Proposed Acquisition	3. PROPOSED ACQUISITION On June 19, 2018, we signed a definitive agreement to purchase Georgia-Pacific’s European nonwovens business (the “GP Business”) for $185 million, subject to customary purchase price adjustments. The proposed transaction is subject to customary closing conditions, including receipt of required regulatory approvals. The proposed transaction includes 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. In 2017, the GP Business had net sales of $99 million. The acquisition is expected to close in the fourth quarter of 2018 and we plan to finance the transaction through a combination of cash on hand and borrowings under our revolving credit facility.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2018
Disaggregation Of Revenue [Abstract]
Revenue	4. REVENUE The following tables set forth disaggregated information pertaining to our net sales: Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Composite Fibers Food & beverage $ 70,186 $ 65,434 $ 140,583 $ 128,036 Wallcovering 27,789 26,173 55,921 48,628 Technical specialties 21,609 17,676 42,567 35,383 Composite laminates 8,960 9,255 18,358 18,094 Metallized 14,390 14,599 27,102 28,100 142,934 133,137 284,531 258,241 Advanced Airlaid Materials Feminine hygiene 46,937 44,503 95,410 86,927 Specialty wipes 10,495 6,992 18,262 13,042 Adult incontinence 5,190 3,220 9,622 6,864 Home care 3,875 3,169 7,902 5,927 Other 6,311 4,952 11,224 9,914 72,808 62,836 142,420 122,674 Specialty Papers Carbonless & forms 69,743 70,976 141,613 148,048 Engineered products 51,697 47,113 101,648 95,275 Envelope & converting 36,051 36,765 73,956 79,622 Book publishing 31,963 36,111 70,521 73,284 Other 577 403 1,731 911 190,031 191,368 389,469 397,140 TOTAL $ 405,773 $ 387,342 $ 816,420 $ 778,055 Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Composite Fibers Europe, Middle East and Africa $ 91,790 $ 84,041 $ 186,572 $ 167,588 Americas 28,992 27,477 53,040 50,536 Asia Pacific 22,152 21,619 44,919 40,117 142,934 133,137 284,531 258,241 Advanced Airlaid Materials Europe, Middle East and Africa 35,905 32,404 72,133 62,133 Americas 36,310 30,011 69,128 59,932 Asia Pacific 593 421 1,159 609 72,808 62,836 142,420 122,674 Specialty Papers Americas 188,505 190,546 386,333 395,321 Other 1,526 822 3,136 1,819 190,031 191,368 389,469 397,140 TOTAL $ 405,773 $ 387,342 $ 816,420 $ 778,055

Gains on Dispositions of Plant,

Gains on Dispositions of Plant, Equipment and Timberlands	6 Months Ended
	Jun. 30, 2018
Property Plant And Equipment [Abstract]
Gains on Dispositions of Plant, Equipment and Timberlands	5. GAINS ON DISPOSITION OF PLANT, EQUIPMENT AND TIMBERLANDS During the first six months of 2018 and 2017 we completed the following sales of assets: Dollars in thousands Acres Proceeds Gain (loss) 2018 Timberlands 1,029 $ 1,785 $ 1,680 Other n/a 599 453 Total $ 2,384 $ 2,133 2017 Timberlands 46 $ 75 $ 74 Other n/a 8 (48 ) Total $ 83 $ 26

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	6. EARNINGS PER SHARE The following table sets forth the details of basic and diluted earnings per share (“EPS”): Three months ended June 30 In thousands, except per share 2018 2017 Net loss $ (7,399 ) $ (5,714 ) Weighted average common shares outstanding used in basic EPS 43,770 43,604 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — — Weighted average common shares outstanding and common share equivalents used in diluted EPS 43,770 43,604 Loss per share Basic $ (0.17 ) $ (0.13 ) Diluted (0.17 ) (0.13 ) Six months ended June 30 In thousands, except per share 2018 2017 Net income (loss) $ (1,683 ) $ 5,889 Weighted average common shares outstanding used in basic EPS 43,735 43,593 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — 856 Weighted average common shares outstanding and common share equivalents used in diluted EPS 43,735 44,449 Earnings (loss) per share Basic $ (0.04 ) $ 0.14 Diluted (0.04 ) 0.13 The following table sets forth potential common shares outstanding that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive: June 30 In thousands 2018 2017 Three months ended 2,393 1,327 Six months ended 2,393 591

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	7 . ACCUMULATED OTHER COMPREHENSIVE INCOME The following table sets forth details of the changes in accumulated other comprehensive income (losses) for the three months and six months ended June 30, 2018 and 2017. 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 April 1, 2018 (29,092 ) (5,894 ) (118,428 ) 4,461 (148,953 ) Other comprehensive income (loss) before reclassifications (net of tax) (33,223 ) 3,368 — — (29,855 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 1,181 3,261 (240 ) 4,202 Net current period other comprehensive income (loss) (33,223 ) 4,549 3,261 (240 ) (25,653 ) Balance at June 30, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Balance at April 1, 2017 $ (94,383 ) $ 554 $ (108,466 ) $ 4,882 $ (197,413 ) Other comprehensive income (loss) before reclassifications (net of tax) 27,504 (3,080 ) — (106 ) 24,318 Amounts reclassified from accumulated other comprehensive income (net of tax) — (571 ) 2,642 (57 ) 2,014 Net current period other comprehensive income (loss) 27,504 (3,651 ) 2,642 (163 ) 26,332 Balance at June 30, 2017 $ (66,879 ) $ (3,097 ) $ (105,824 ) $ 4,719 $ (171,081 ) 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, 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) (20,476 ) 151 — — (20,325 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 2,596 6,425 (329 ) 8,692 Net current period other comprehensive income (loss) (20,476 ) 2,747 6,425 (329 ) (11,633 ) Balance at June 30, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Balance at January 1, 2017 $ (100,448 ) $ 1,500 $ (110,656 ) $ 4,998 $ (204,606 ) Other comprehensive income (loss) before reclassifications (net of tax) 33,569 (3,335 ) — (106 ) 30,128 Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,262 ) 4,832 (173 ) 3,397 Net current period other comprehensive income (loss) 33,569 (4,597 ) 4,832 (279 ) 33,525 Balance at June 30, 2017 $ (66,879 ) $ (3,097 ) $ (105,824 ) $ 4,719 $ (171,081 ) Reclassifications out of accumulated other comprehensive income and into the condensed consolidated statements of income were as follows: Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Description Line Item in Statements of Income Cash flow hedges (Note 13) (Gains) losses on cash flow hedges $ 1,636 $ (785 ) $ 3,595 $ (1,716 ) Costs of products sold Tax expense (benefit) (455 ) 214 (999 ) 454 Income tax provision (benefit) Net of tax 1,181 (571 ) 2,596 (1,262 ) Retirement plan obligations (Note 8) Amortization of deferred benefit pension plans Prior service costs 781 708 1,561 1,412 Other, net Actuarial losses 3,523 3,311 6,913 6,133 Other, net 4,304 4,019 8,474 7,545 Tax benefit (1,043 ) (1,377 ) (2,049 ) (2,713 ) Income tax provision (benefit) Net of tax 3,261 2,642 6,425 4,832 Amortization of deferred benefit other plans Prior service costs (46 ) (46 ) (91 ) (91 ) Other, net Actuarial gains (272 ) (46 ) (345 ) (189 ) Other, net (318 ) (92 ) (436 ) (280 ) Tax expense 78 35 107 107 Income tax provision (benefit) Net of tax (240 ) (57 ) (329 ) (173 ) Total reclassifications, net of tax $ 4,202 $ 2,014 $ 8,692 $ 3,397

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	8. INCOME TAXES On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“TCJA”) was signed into U.S. law. Among other things, the TCJA reduces the U.S. federal corporate tax rate from 35% to 21% beginning in 2018 and requires companies to pay a one-time transition tax on previously unremitted earnings of non-U.S. subsidiaries that were previously tax deferred. ASC Topic 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017. Given the significance of the legislation, the U.S. Securities and Exchange Commission (the "SEC") staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. However, the measurement period is deemed to have ended earlier when the registrant has obtained, prepared, and analyzed the information necessary to finalize its accounting. During the measurement period, impacts of the law are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared, or analyzed. Our accounting for certain elements of the TCJA was incomplete as of December 31, 2017 and remains incomplete as of June 30, 2018. The TCJA includes a one-time mandatory repatriation transition tax on the net accumulated earnings and profits of a U.S. taxpayer’s foreign subsidiaries. We performed preliminary earnings and profit analysis which enabled us to make reasonable estimates of the effects and therefore, recorded provisional estimates for these items. A final determination of the TCJA’s impact remains incomplete pending a full analysis of the provisions and their final interpretation. During early 2018, the Internal Revenue Service issued additional guidance affecting the computation of our 2017 federal income tax liability. The ultimate impact of the TCJA may differ from current estimates, and such differences could be material, due to changes in interpretations or assumptions. While the TCJA provides for a territorial tax system, beginning in 2018, it includes the global intangible low-taxed income (“GILTI”) provision. We elected to account for GILTI tax in the period in which it is incurred. The GILTI provisions require entities to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. For the six months ended June 30, 2018, our effective tax rate increased by approximately 10% as a result of the GILTI provisions due to our utilization of U.S. federal tax loss carryforward, which restricts our ability to recognize the associated foreign tax credits and a deduction of up to 50% of the GILTI income. Since we are using U.S. federal tax loss carryforwards, there is no impact to cash taxes related to the GILTI provisions. 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. As of June 30, 2018 and December 31, 2017, we had $28.2 million and $26.9 million, respectively, of gross unrecognized tax benefits. As of June 30, 2018, if such benefits were to be recognized, approximately $18.0 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 2014 - 2017 N/A State 2013 - 2017 2014 - 2016 Canada (1) 2010-2013; 2017 2014 - 2016 Germany (1) 2016 - 2017 2011 - 2015 France 2015 - 2017 2012 United Kingdom 2016 - 2017 N/A Philippines 2015, 2017 2016 (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 $4.7 million. Substantially all of 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 related to interest and penalties on uncertain tax positions: Six months ended June 30 In millions 2018 2017 Interest expense (income) $ 0.2 $ 0.3 Penalties — — June 30 December 31 2018 2017 Accrued interest payable $ 1.0 $ 0.8

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	9. STOCK-BASED 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 members of management and vesting is based on achievement of cumulative financial performance targets covering a two year period followed by an additional one-year service period. 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 2018 2017 Balance at January 1, 929,386 679,038 Granted 389,065 364,748 Forfeited (70,891 ) (91,449 ) Shares delivered (150,020 ) (24,052 ) Balance at June 30, 1,097,540 928,285 The amount granted in 2018 and 2017 includes 183,355 and 163,274, respectively, of PSAs exclusive of reinvested dividends. The following table sets forth aggregate RSU and PSA compensation expense for the periods indicated: June 30 In thousands 2018 2017 Three months ended $ 1,651 $ 1,049 Six months ended 3,455 2,088 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 during the first six months of 2018 or 2017. The following table sets forth information related to outstanding SOSARS for the six months ended June 30; 2018 2017 SOSARS Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 2,561,846 $ 17.87 2,736,616 $ 17.64 Granted — — — — Exercised (148,145 ) 13.26 (33,050 ) 14.65 Canceled / forfeited (20,994 ) 18.76 (17,630 ) 18.46 Outstanding at June 30, 2,392,707 $ 18.15 2,685,936 $ 17.67 The following table sets forth SOSAR compensation expense for the periods indicated: June 30 In thousands 2018 2017 Three months ended $ 70 $ 259 Six months ended 249 868

Retirement Plans and Other Post

Retirement Plans and Other Post-Retirement Benefits	6 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Retirement Plans and Other Post-Retirement Benefits	10. 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. Three months ended June 30 In thousands 2018 2017 Pension Benefits Service cost $ 2,747 $ 2,649 Interest cost 5,626 5,989 Expected return on plan assets (10,722 ) (10,666 ) Amortization of prior service cost 781 708 Amortization of unrecognized loss 3,523 3,311 Total net periodic benefit cost $ 1,955 $ 1,991 Other Benefits Service cost $ 238 $ 284 Interest cost 410 513 Amortization of prior service credit (46 ) (46 ) Amortization of actuarial gain (272 ) (46 ) Total net periodic benefit cost $ 330 $ 705 Six months ended June 30 In thousands 2018 2017 Pension Benefits Service cost $ 5,606 $ 5,370 Interest cost 11,215 11,896 Expected return on plan assets (21,561 ) (21,497 ) Amortization of prior service cost 1,561 1,412 Amortization of unrecognized loss 6,913 6,133 Total net periodic benefit cost $ 3,734 $ 3,314 Other Benefits Service cost $ 545 $ 579 Interest cost 861 998 Amortization of prior service credit (91 ) (91 ) Amortization of actuarial gain (345 ) (189 ) Total net periodic benefit cost $ 970 $ 1,297 In the first quarter of 2018, we adopted the provisions of ASU No. 2017-07 which requires entities to present the service cost component of net periodic benefit costs in operating profit along with other employee compensation costs. All other components of net periodic benefit costs are to be presented below the determination of operating income in “Other, net”.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventories	11. INVENTORIES Inventories, net of reserves, were as follows: June 30 December 31 In thousands 2018 2017 Raw materials $ 65,426 $ 60,806 In-process and finished 127,311 116,678 Supplies 78,258 74,580 Total $ 270,995 $ 252,064

Capitalized Interest

Capitalized Interest	6 Months Ended
	Jun. 30, 2018
Interest Expense [Abstract]
Capitalized Interest	12. CAPITALIZED INTEREST The following table sets forth details of interest incurred, capitalized and expensed: Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Interest cost incurred $ 5,814 $ 4,880 $ 11,405 $ 9,477 Interest capitalized - 404 396 993 Interest expense $ 5,814 $ 4,476 $ 11,009 $ 8,484 Capitalized interest primarily relates to spending for the Airlaid capacity expansion project in 2017 and 2018 and the Specialty Papers’ environmental compliance project in 2017.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	13. LONG-TERM DEBT Long-term debt is summarized as follows: June 30 December 31 In thousands 2018 2017 Revolving credit facility, due Mar. 2020 $ 217,860 $ 171,200 5.375% Notes, due Oct. 2020 250,000 250,000 2.40% Term Loan, due Jun. 2022 6,661 7,710 2.05% Term Loan, due Mar. 2023 29,556 33,607 1.30% Term Loan, due Jun. 2023 8,327 9,423 1.55% Term Loan, due Sep. 2025 10,356 11,390 Total long-term debt 522,760 483,330 Less current portion (10,982 ) (11,298 ) Unamortized deferred issuance costs (1,601 ) (1,934 ) Long-term debt, net of current portion $ 510,177 $ 470,098 On March 12, 2015, we amended our revolving credit agreement with a consortium of banks (the “Revolving Credit Facility”) which increased the amount available for borrowing to $400 million, extended the maturity of the facility to March 12, 2020, and instituted a revised interest rate pricing grid. On February 1, 2017, the Revolving Credit Facility was further amended to, among other, change the definition of earnings before interest, taxes, depreciation and amortization (“EBITDA”) for purposes of calculating covenant compliance. 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 daily 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 daily 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, interest is based on (b) above. The Revolving Credit Facility 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 3.5x. As of June 30, 2018, the leverage ratio, as calculated in accordance with the definition in our amended credit agreement, was 3.1x. 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 facility. On October 3, 2012, we completed a private placement offering of $250.0 million aggregate principal amount of 5.375% Senior Notes due 2020 (the “5.375% Notes”). The 5.375% Notes, which are publically registered, are fully and unconditionally guaranteed, jointly and severally, by PHG Tea Leaves, Inc., Mollanvick, Inc., Glatfelter Composite Fibers N. A., Inc., Glatfelter Advanced Materials N.A., LLC., and Glatfelter Holdings, LLC (the “Guarantors”). Interest on the 5.375% Notes is payable semiannually in arrears on April 15 and October 15. The 5.375% Notes are redeemable, in whole or in part, at any time on or after October 15, 2016 at the redemption prices specified in the applicable Indenture. These Notes and the guarantees of the notes are senior obligations of the Company and the Guarantors, respectively, rank equally in right of payment with future senior indebtedness of the Company and the Guarantors and will mature on October 15, 2020. The 5.375% Notes contain various covenants customary to indebtedness of this nature including limitations on i) the amount of indebtedness that may be incurred; ii) certain restricted payments including common stock dividends; iii) distributions from certain subsidiaries; iv) sales of assets; v) transactions amongst subsidiaries; and vi) incurrence of liens on assets. In addition, the 5.375% Notes contain cross default provisions that could result in all such notes becoming due and payable in the event of a failure to repay debt outstanding under the Revolving Credit Facility at maturity or a default under the Revolving Credit Facility that accelerates the debt outstanding thereunder. As of June 30, 2018, we met all of the requirements of our debt covenants. 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 Revolving Credit Facility. 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 $5.2 million as of June 30, 2018 and December 31, 2017. 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. 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	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	14. 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: June 30, 2018 December 31, 2017 In thousands Carrying Value Fair Value Carrying Value Fair Value Variable rate debt $ 217,860 $ 217,860 $ 171,200 $ 171,200 Fixed-rate bonds 250,000 252,375 250,000 253,823 2.40% Term loan 6,661 6,813 7,710 7,889 2.05% Term loan 29,556 30,032 33,607 34,122 1.30% Term Loan 8,327 8,302 9,423 9,370 1.55% Term loan 10,356 10,323 11,390 11,320 Total $ 522,760 $ 525,705 $ 483,330 $ 487,724 As of June 30, 2018, and December 31, 2017, we had $250.0 million of 5.375% fixed rate bonds. These bonds are publicly registered, but thinly traded. The fair value of financial derivatives is set forth below in Note 15.

Financial Derivatives and Hedgi

Financial Derivatives and Hedging Activities	6 Months Ended
	Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Financial Derivatives and Hedging Activities	15. 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 June 30, 2018, 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. The ineffective portion of the change in fair value of the derivative is recognized directly to earnings and reflected in the accompanying condensed consolidated statements of income as non-operating income (expense) under the caption “Other, net.” 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 June 30 2018 December 31 2017 Derivative Sell/Buy - sell notional Philippine Peso / British Pound — 19,047 Euro / British Pound 12,230 13,586 Euro / U.S. Dollar — 1,048 U.S. Dollar / Euro 349 946 Sell/Buy - buy notional Euro / Philippine Peso 1,031,730 890,096 British Pound / Philippine Peso 767,306 797,496 U.S. Dollar / Euro 1,310 4,253 Euro / U.S. Dollar 68,673 60,519 U.S. Dollar / Canadian Dollar 32,280 32,265 British Pound / Euro — 335 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 June 30 2018 December 31 2017 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 22,500 17,500 British Pound / Euro 1,000 1,000 Canadian / U.S. dollar 2,500 - Sell/Buy - buy notional Euro / U.S. Dollar 6,000 4,500 British Pound / Euro 9,000 13,000 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 June 30 2018 December 31 2017 June 30 2018 December 31 2017 Prepaid Expenses and Other Other Balance sheet caption Current Assets Current Liabilities Designated as hedging: Forward foreign currency exchange contracts $ 1,085 $ 1,066 $ 1,419 $ 4,787 Not designated as hedging: Forward foreign currency exchange contracts $ 351 $ 151 $ 422 $ 43 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 June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Designated as hedging: Forward foreign currency exchange contracts: Effective portion – cost of products sold $ (1,636 ) $ 785 $ (3,595 ) $ 1,716 Ineffective portion – other – net 110 36 (212 ) 86 Not designated as hedging: Forward foreign currency exchange contracts: Other – net $ (898 ) $ 370 $ (601 ) $ 391 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) is as follows: In thousands 2018 2017 Balance at January 1, $ (5,640 ) $ 1,882 Deferred (losses) gains on cash flow hedges 288 (4,801 ) Reclassified to earnings 3,595 (1,716 ) Balance at June 30, $ (1,757 ) $ (4,635 ) 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	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments, Contingencies and Legal Proceedings	16. COMMITMENTS, CONTINGENCIES AND LEGAL PROCEEDINGS Fox River - Neenah, Wisconsin Background. We have 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”). Since the early 1990s, the United States, the State of Wisconsin and two Indian tribes (collectively, the “Governments”) have pursued a cleanup of a 39-mile stretch of river from Little Lake Butte des Morts into Green Bay and natural resource damages (“NRDs”). The Site has been subject to certain studies, demonstration projects and interim cleanups. The permanent cleanup, known as a “remedial action” under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), consists of sediment dredging, installation of engineered caps and placement of sand covers in various areas in the bed of the river. The United States originally notified several entities that they were potentially responsible parties (“PRPs”); however, after giving effect to settlements reached with the Governments, the remaining PRPs exposed to continuing obligations to implement the remainder of the cleanup consist of us, Georgia Pacific Consumer Products, L.P. (“Georgia Pacific”) and NCR Corporation (“NCR”). 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”). We and WTM I Company (“WTM I”), one of the PRPs, implemented the remedial action in OU1 under a consent decree with the Governments; Menasha Corporation made a financial contribution to that work. That project began in 2004 and the work is complete, other than on-going monitoring and maintenance. For OU2-5, work has proceeded primarily under a Unilateral Administrative Order (“UAO”) issued in November 2007 by the EPA to us and seven other respondents. The majority of that work to date has been funded or conducted by parties other than us. Prior to the UAO, we contributed to a project in that area. Since the issuance of the UAO we have conducted about $13.4 million of cleanup work under the UAO in 2015 and 2016. The cleanup is expected to continue through 2019. However, as discussed below, under a consent decree between the United States, Wisconsin, NCR and Appvion, we are not responsible for any additional cleanup at the Site. Litigation and Settlement . In 2008, in an allocation action, NCR and Appvion sued us and many other defendants in an effort to allocate among the liable parties the costs of cleaning up this Site and compensating the Governments for their costs and the natural resource trustees for NRDs. This case has been called the “Whiting litigation.” After several summary judgment rulings and a trial, the trial court entered judgment in the Whiting Litigation allocating to NCR 100% of the costs of (a) the OU2-5 cleanup, (b) NRDs, (c) past and future costs incurred by the Governments in OU2-5, and (d) past and future costs incurred by any of the other parties net of an appropriate equitable adjustment for insurance recoveries. On appeal, the United States Court of Appeals for the Seventh Circuit affirmed the district court’s ruling, holding that if knowledge and fault were the only equitable factors governing allocation of costs and NRDs at the Site, NCR would owe 100% of all costs and damages in OU2-5, but would not have a share of costs in OU1 -- which is upstream of the outfall of the facilities for which NCR is responsible -- solely as an “arranger for disposal” of PCB-containing waste paper by recycling it at our mill. However, the court of appeals vacated the judgment and remanded the case for the district court’s further consideration of whether any other equitable factors might cause the district court to alter its allocation to something less than 100% to NCR. In 2010, in an enforcement action, the Governments sued us and other defendants for (a) an injunction to require implementation of the cleanup ordered by the 2007 UAO, (b) recovery of the Governments’ past and future costs of response, (c) recovery of NRDs, and (d) recovery of a declaration of liability for the Site. After appeals, the Governments did not obtain an injunction and they withdrew their claims for NRDs. The Governments obtained a declaration of our liability to comply with the 2007 UAO. The Governments’ costs claims remained pending. On January 17, 2017, the United States filed a consent decree with the federal district court among the United States, Wisconsin, NCR, and Appvion (the “NCR/Appvion consent decree”) under which NCR would agree to complete the remaining cleanup and both NCR and Appvion would agree not to seek to recover from us or anyone else any amounts they have spent or will spend, and we and others would be barred from seeking claims against NCR or Appvion. On March 29, 2017, the United States moved for entry of a somewhat revised version of the NCR/Appvion consent decree, which the federal district court entered on August 23, 2017. Under the consent decree, if it were to withstand appeal, we would only face exposure to: (i) government past oversight costs, (ii) government future oversight costs, (iii) long term monitoring and maintenance, and (iv) depending on the reason, a further remedy if necessary in the event the currently ordered remedy fails, over 30 or more years, to achieve its objectives. As the result of earlier settlements, Georgia Pacific is only jointly liable with us to the Governments for monitoring and maintenance costs incurred in the most downstream three miles of the river (“OU4b”) and the bay of Green Bay (“OU5”). In addition, we and Georgia Pacific had claims against each other to reallocate the costs that we have each incurred or will incur. We have settled those claims. Under this settlement, Georgia Pacific has agreed to implement the monitoring and maintenance in OU4b and OU5 and we would be responsible for monitoring and maintenance of all other upstream Operable Units. We paid Georgia Pacific $9.5 million in August 2017. The NCR/Appvion consent decree and our settlement with Georgia Pacific resulted in all claims among the responsible parties being barred, waived, or withdrawn. Accordingly, on October 10, 2017, the federal district court approved a stipulation dismissing all remaining claims in the Whiting litigation. Therefore, unless certain limited circumstances occur permitting reassertion of claims, we are not subject to claims for reallocation of costs or damages incurred by any of the other parties and we cannot seek contribution or reallocation from them. On October 20, 2017, we appealed the district court’s approval of the NCR/Appvion consent decree. We contend that the court did not do what was required to properly conclude that the NCR/Appvion consent decree was substantially fair to us. We contend that the consent decree was unfair to us because the costs we have already incurred and the costs that we would have to incur were the NCR/Appvion consent decree to remain in effect would exceed our fair share of costs for this site. If we prevail on appeal, the circumstances that caused us to prevail would lead us to anticipate that, while all costs would again be subject to reallocation, that reallocation would be in our favor. Cost estimates. The proposed NCR/Appvion consent decree, as revised, states that all parties combined have spent more than $1 billion through March 2017 towards remedial actions and NRDs, of which we have contributed approximately $75 million. In addition, work to complete the remaining site remedy under the UAO was anticipated to cost approximately $200 million at the beginning of the 2017 remediation season. We believe NCR to have completed a full season of work in 2017 and to working during the 2018 season. So long as the NCR/Appvion consent decree remains in effect, we are not exposed to reallocation of any of those amounts, and no other party will be exposed to reallocation of any of the amounts that we have incurred or may incur in the future. So long as the NCR/Appvion consent decree remains in effect, we (and not NCR) would remain responsible for the Governments’ unreimbursed past costs. Many parties have entered into settlements with the Governments over time, including us, that have called for payments of cash or in-kind provision of natural resource restoration projects. Certain amounts were allocated to the United States and the State to reimburse their costs, and other amounts were allocated to the Natural Resource Damages Assessment and Restoration (“NRDAR”) Fund to pay for natural resource damages assessment, if any, and restoration projects. The Governments may not recover costs from us that anyone has reimbursed previously. As of the end of 2015, the United States claims to have incurred about $32.7 million in unreimbursed recoverable costs including prejudgment interest, an amount that we dispute. The State had no unreimbursed recoverable costs, and now claims to have had on hand approximately $4.6 million of unspent settlement money, a claim that we also dispute. Further, the NRDAR Fund had received what the Governments claim to have been approximately $105 million in settlement payments, of which more than $60 million remained unspent. On February 5, 2018, the district court decided that the Governments’ recovery of costs would be reduced by the funds held by the State at the end of 2015 and by any amount by which the Governments had applied settlement payments to natural resource damages in excess of the actual amount of natural resource damages. The Governments moved for reconsideration. On July 13, 2018, the district court denied that motion, holding that the United States’ right to recover should be reduced by (a) the amount by which the $105 million of settlement payments accounted as a recovery of NRDs exceeded the actual NRDs and (b) the amounts held as a balance by the State that the State has not subsequently spent. Both of those would be the subject of a trial. The Governments have requested permission to appeal that determination. We contend that the natural resource restoration projects already constructed fully compensate the public for any natural resource damages, and therefore that the entire unspent balance in the NRDAR Fund remains as an offset, an amount likely to exceed all of the Governments’ past and future costs of response. No date has yet been set for trial of the issue. If at trial the actual amount of NRDs were determined to be more than the Governments have collected in settlements, we might be exposed to that shortfall. So long as the NCR/Appvion consent decree remains in effect, we would also remain subject to our remaining obligations under the OU1 consent decree, which now consist of long term monitoring and maintenance that we expect earlier contributions to the OU1 escrow account to fund these costs. Furthermore, we, along with Georgia Pacific, but not NCR, would be responsible for long term monitoring and maintenance required pursuant to the Lower Fox River 100% Remedial Design Report dated December 2009 – Long Term Monitoring Plan (the “Plan”). The Plan requires long term monitoring of each of OU2 through OU5 over a period of at least 30 years. The monitoring activities consist of, among others, testing fish tissue, sampling water quality and sediment, and inspections of the engineered caps. Each operable unit is required to be monitored; however, because of our settlement with Georgia Pacific, our obligations are in OU1-OU4a. In the first quarter of 2018, we entered into a fixed-price, 30 year agreement with a third party for the performance of all of our monitoring and maintenance obligations in OU1 through the upper four miles of OU4 (“OU4a”) with limited exceptions, such as, for extraordinary amounts of cap maintenance or replacement. Our obligation under this agreement is included in our total reserve for the Site. The portion of this agreement that pertains to OU1 will be paid out of the previously funded OU1 escrow account. We and WTM I executed documents for the withdrawal of WTM I from the entity we jointly formed for the performance of the OU1 work and for the release of all claims between us related to the Site, which was approved by the court overseeing WTM I’s bankruptcy in May 2018. As a result of this action, we assumed WTM I’s portion of the OU1 escrow account totaling approximately $4.7 million, which is included under the caption “Other assets” on the condensed consolidated balance sheet at June 30, 2018 and have increased our reserve for Fox River by an equal amount for potential liabilities associated with the river that we believe may ultimately be satisfied with funds from the escrow account. Reserves for the Site. Our reserve for all remaining claims against us relating to PCB contamination is set forth below: Six months ended June 30 In thousands 2018 2017 Balance at January 1, $ 43,144 $ 52,788 Payments (2,708 ) (128 ) Assumption of WTM I escrow 4,746 - Accretion 66 - Balance at June 30, $ 45,248 $ 52,660 The payments set forth above primarily represent cash paid under the recently-entered long-term monitoring and maintenance agreement. Of our total reserve for the Fox River, $26.0 million is recorded in the accompanying March 31, 2018 condensed consolidated balance sheet under the caption “Environmental liabilities” and the remaining $19.2 million is recorded under the caption “Other long term liabilities.” Range of Reasonably Possible Outcomes . Based on our analysis of all available information, including but not limited to decisions of the courts, official documents such as records of decision, discussions with legal counsel, cost estimates for future monitoring and maintenance and other post-remediation costs to be performed at the Site, we believe it is reasonably possible that our costs associated with the Fox River matter could exceed the aggregate amounts accrued by amounts ranging from insignificant to approximately $30 million. We believe the likelihood of an outcome in the upper end of the monetary range is less than other possible outcomes within the range and the possibility of an outcome in excess of the upper end of the monetary range is remote. Summary . Our current assessment is we will be able to manage this environmental matter without a long-term, material adverse impact on the Company. This matter could, however, at any particular time or for any particular year or years, have a material adverse effect on our consolidated financial position, liquidity and/or results of operations or could result in a default under our debt covenants. Moreover, there can be no assurance our reserves will be adequate to provide for future obligations related to this matter, or our share of costs and/or damages will not exceed our available resources, or those obligations will not have a material adverse effect on our consolidated financial position, liquidity or results of operations and might result in a default under our loan covenants.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Information	17. SEGMENT INFORMATION The following tables set forth financial and other information by business unit for the period indicated: Three months ended June 30 Advanced Airlaid Other and Dollars in millions Composite Fibers Materials Specialty Papers Unallocated Total 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net sales $ 142.9 $ 133.1 $ 72.8 $ 62.8 $ 190.0 $ 191.4 $ — $ — $ 405.8 $ 387.3 Energy and related sales, net — — — — 0.9 1.0 — — 0.9 1.0 Total revenue 142.9 133.1 72.8 62.8 190.9 192.4 — — 406.7 388.3 Cost of products sold 118.0 107.6 62.8 53.0 200.6 195.6 3.7 2.4 385.1 358.6 Gross profit (loss) 24.9 25.5 10.0 9.8 (9.7 ) (3.2 ) (3.7 ) (2.4 ) 21.6 29.7 SG&A 11.7 10.8 2.4 2.3 11.2 10.3 6.3 8.1 31.6 31.5 (Gains) losses on dispositions of plant, equipment and timberlands, net — — — — — — (0.6 ) — (0.6 ) — Total operating income (loss) 13.2 14.7 7.6 7.5 (20.9 ) (13.5 ) (9.4 ) (10.5 ) (9.4 ) (1.8 ) Non-operating expense — — — — — — (6.0 ) (4.3 ) (6.0 ) (4.3 ) Income (loss) before income taxes $ 13.2 $ 14.7 $ 7.6 $ 7.5 $ (20.9 ) $ (13.5 ) $ (15.4 ) $ (14.8 ) $ (15.4 ) $ (6.1 ) Supplementary Data Net tons sold (thousands) 40.4 41.9 27.0 25.5 173.2 184.1 — — 240.6 251.5 Depreciation, depletion and amortization $ 7.2 $ 7.0 $ 3.5 $ 2.3 $ 8.2 $ 7.7 $ 1.2 $ 0.7 $ 20.1 $ 17.7 Capital expenditures 2.8 2.1 2.5 12.9 4.5 15.8 0.6 3.5 10.4 34.3 Six months ended June 30 Advanced Airlaid Other and Dollars in millions Composite Fibers Materials Specialty Papers Unallocated Total 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net sales $ 284.5 $ 258.2 $ 142.4 $ 122.7 $ 389.5 $ 397.1 $ — $ — $ 816.4 $ 778.1 Energy and related sales, net — — — — 2.4 2.1 — — 2.4 2.1 Total revenue 284.5 258.2 142.4 122.7 391.9 399.2 — — 818.8 780.2 Cost of products sold 232.7 207.2 122.5 103.5 387.1 375.6 6.0 8.5 748.3 694.8 Gross profit (loss) 51.8 51.0 19.9 19.2 4.8 23.6 (6.0 ) (8.5 ) 70.5 85.4 SG&A 23.3 21.9 5.1 4.6 23.3 23.6 16.9 16.3 68.6 66.4 (Gains) losses on dispositions of plant, equipment and timberlands, net — — — — — — (2.1 ) — (2.1 ) — Total operating income (loss) 28.5 29.1 14.8 14.6 (18.5 ) --- (20.8 ) (24.7 ) 4.0 19.0 Non-operating expense — — — — — — (11.0 ) (7.4 ) (11.0 ) (7.4 ) Income (loss) before income taxes $ 28.5 $ 29.1 $ 14.8 $ 14.6 $ (18.5 ) $ — $ (31.8 ) $ (32.1 ) $ (6.9 ) $ 11.6 Supplementary Data Net tons sold (thousands) 80.5 80.7 53.3 50.3 361.6 381.4 — — 495.4 512.4 Depreciation, depletion and amortization $ 14.6 $ 13.8 $ 6.3 $ 4.6 $ 16.3 $ 14.9 $ 2.3 $ 1.7 $ 39.5 $ 35.0 Capital expenditures 7.9 6.8 15.6 23.5 11.0 34.0 2.4 6.7 36.9 71.0 The sum of individual amounts set forth above may not agree to the consolidated financial statements included herein due to rounding. Business Units Results of individual business units 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 business units are not necessarily comparable with similar information for any other company. The management accounting process uses assumptions and allocations to measure performance of the business units. 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 business unit are allocated primarily based on an estimated utilization of support area services or are included in “Other and Unallocated” in the Business Unit Performance table. Management evaluates results of operations of the business units before retirement expenses, 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 business units 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 business unit 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.

Condensed Consolidating Financi

Condensed Consolidating Financial Statements	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Statements	18. CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Our 5.375% Notes issued by P. H. Glatfelter Company (the “Parent”) are fully and unconditionally guaranteed, on a joint and several basis, by certain of our 100%-owned domestic subsidiaries, PHG Tea Leaves, Inc., Mollanvick, Inc., Glatfelter Composite Fibers N. A., Inc. (“CFNA”), Glatfelter Advance Materials N.A., Inc. (“GAMNA”), and Glatfelter Holdings, LLC. The guarantees are subject to certain customary release provisions including i) the designation of such subsidiary as an unrestricted or excluded subsidiary; (ii) in connection with any sale or disposition of the capital stock of the subsidiary guarantor; or (iii) upon our exercise of our legal defeasance option or our covenant defeasance option, all of which are more fully described in the Indenture dated as of October 3, 2012 and the First Supplemental Indenture dated as of October 27, 2015, among us, the Guarantors and US Bank National Association, as Trustee, relating to the 5.375% Notes. The following presents our condensed consolidating statements of income, including comprehensive income, for the six months ended June 30, 2018 and 2017, our condensed consolidating balance sheets as of June 30, 2018 and December 31, 2017, and our condensed consolidating cash flows for the six months ended June 30, 2018 and 2017. Condensed Consolidating Statement of Income for the three months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 190,032 $ 32,319 $ 208,579 $ (25,157 ) $ 405,773 Energy and related sales, net 944 — — — 944 Total revenues 190,976 32,319 208,579 (25,157 ) 406,717 Costs of products sold 203,339 31,097 175,835 (25,157 ) 385,114 Gross profit (loss) (12,363 ) 1,222 32,744 — 21,603 Selling, general and administrative expenses 16,971 (332 ) 14,922 — 31,561 (Gain) loss on dispositions of plant equipment and timberlands, net (22 ) (565 ) 8 — (579 ) Operating income (loss) (29,312 ) 2,119 17,814 — (9,379 ) Other non-operating income (expense) Interest expense (6,389 ) (585 ) (446 ) 1,606 (5,814 ) Interest income 133 1,446 53 (1,606 ) 26 Equity in earnings of subsidiaries 14,971 12,707 — (27,678 ) — Other, net 1,532 529 (2,318 ) — (257 ) Total other non-operating income (expense) 10,247 14,097 (2,711 ) (27,678 ) (6,045 ) Income (loss) before income taxes (19,065 ) 16,216 15,103 (27,678 ) (15,424 ) Income tax provision (benefit) (11,666 ) 1,267 2,374 — (8,025 ) Net income (loss) (7,399 ) 14,949 12,729 (27,678 ) (7,399 ) Other comprehensive income (loss) (25,653 ) (28,587 ) (28,149 ) 56,736 (25,653 ) Comprehensive income (loss) $ (33,052 ) $ (13,638 ) $ (15,420 ) $ 29,058 $ (33,052 ) Condensed Consolidating Statement of Income for the six months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 389,471 $ 52,332 $ 424,714 $ (50,097 ) $ 816,420 Energy and related sales, net 2,372 — — — 2,372 Total revenues 391,843 52,332 424,714 (50,097 ) 818,792 Costs of products sold 394,504 49,362 354,514 (50,097 ) 748,283 Gross profit (loss) (2,661 ) 2,970 70,200 — 70,509 Selling, general and administrative expenses 37,408 1,673 29,543 — 68,624 (Gain) loss on dispositions of plant equipment and timberlands, net (460 ) (1,680 ) 7 — (2,133 ) Operating income (loss) (39,609 ) 2,977 40,650 — 4,018 Other non-operating income (expense) Interest expense (12,071 ) (1,040 ) (874 ) 2,976 (11,009 ) Interest income 279 2,690 87 (2,976 ) 80 Equity in earnings of subsidiaries 36,204 34,962 — (71,166 ) Other, net (881 ) (2,734 ) 3,587 — (28 ) Total other non-operating income (expense) 23,531 33,878 2,800 (71,166 ) (10,957 ) Income (loss) before income taxes (16,078 ) 36,855 43,450 (71,166 ) (6,939 ) Income tax provision (benefit) (14,395 ) 673 8,466 — (5,256 ) Net income (loss) (1,683 ) 36,182 34,984 (71,166 ) (1,683 ) Other comprehensive income (loss) (11,633 ) (17,551 ) (16,114 ) 33,665 (11,633 ) Comprehensive income (loss) $ (13,316 ) $ 18,631 $ 18,870 $ (37,501 ) $ (13,316 ) Condensed Consolidating Statement of Income for the three months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 191,370 $ 23,052 $ 194,708 $ (21,788 ) $ 387,342 Energy and related sales, net 981 — — — 981 Total revenues 192,351 23,052 194,708 (21,788 ) 388,323 Costs of products sold 196,145 22,047 162,184 (21,788 ) 358,588 Gross profit (3,794 ) 1,005 32,524 — 29,735 Selling, general and administrative expenses 16,421 236 14,888 — 31,545 (Gain) loss on dispositions of plant equipment and timberlands, net 16 (74 ) — — (58 ) Operating income (loss) (20,231 ) 843 17,636 — (1,752 ) Other non-operating income (expense) Interest expense (5,182 ) (206 ) (437 ) 1,349 (4,476 ) Interest income 142 1,237 15 (1,349 ) 45 Equity in earnings of subsidiaries 18,801 19,249 — (38,050 ) Other, net 781 (2,319 ) 1,636 — 98 Total other non-operating income (expense) 14,542 17,961 1,214 (38,050 ) (4,333 ) Income (loss) before income taxes (5,689 ) 18,804 18,850 (38,050 ) (6,085 ) Income tax provision (benefit) 25 3 (399 ) — (371 ) Net income (loss) (5,714 ) 18,801 19,249 (38,050 ) (5,714 ) Other comprehensive income 26,332 23,964 23,371 (47,335 ) 26,332 Comprehensive income $ 20,618 $ 42,765 $ 42,620 $ (85,385 ) $ 20,618 Condensed Consolidating Statement of Income for the six months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 397,141 $ 42,585 $ 380,595 $ (42,266 ) $ 778,055 Energy and related sales, net 2,110 — — — 2,110 Total revenues 399,251 42,585 380,595 (42,266 ) 780,165 Costs of products sold 381,391 40,633 315,043 (42,266 ) 694,801 Gross profit 17,860 1,952 65,552 — 85,364 Selling, general and administrative expenses 36,583 310 29,529 — 66,422 (Gain) loss on dispositions of plant equipment and timberlands, net 48 (74 ) — — (26 ) Operating income (loss) (18,771 ) 1,716 36,023 — 18,968 Other non-operating income (expense) Interest expense (9,843 ) (319 ) (941 ) 2,619 (8,484 ) Interest income 291 2,398 88 (2,619 ) 158 Equity in earnings of subsidiaries 32,418 33,101 - (65,519 ) Other, net 2,365 (4,525 ) 3,070 — 910 Total other non-operating income (expense) 25,231 30,655 2,217 (65,519 ) (7,416 ) Income before income taxes 6,460 32,371 38,240 (65,519 ) 11,552 Income tax provision (benefit) 571 (47 ) 5,139 — 5,663 Net income 5,889 32,418 33,101 (65,519 ) 5,889 Other comprehensive income 33,525 29,066 28,385 (57,451 ) 33,525 Comprehensive income $ 39,414 $ 61,484 $ 61,486 $ (122,970 ) $ 39,414 Condensed Consolidating Balance Sheet as of June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Assets Cash and cash equivalents $ 1,201 $ 1,729 $ 104,259 $ - $ 107,189 Other current assets 262,122 256,018 295,167 (316,171 ) 497,136 Plant, equipment and timberlands, net 367,703 86,461 390,303 — 844,467 Investments in subsidiaries 837,670 652,335 — (1,490,005 ) — Other assets 144,794 — 143,511 — 288,305 Total assets $ 1,613,490 $ 996,543 $ 933,240 $ (1,806,176 ) $ 1,737,097 Liabilities and Shareholders' Equity Current liabilities $ 422,603 $ 81,975 $ 148,468 $ (316,171 ) $ 336,875 Long-term debt 394,462 67,000 48,715 — 510,177 Deferred income taxes 3,201 18,542 54,321 — 76,064 Other long-term liabilities 106,272 485 20,272 — 127,029 Total liabilities 926,538 168,002 271,776 (316,171 ) 1,050,145 Shareholders’ equity 686,952 828,541 661,464 (1,490,005 ) 686,952 Total liabilities and shareholders’ equity $ 1,613,490 $ 996,543 $ 933,240 $ (1,806,176 ) $ 1,737,097 Condensed Consolidating Balance Sheet as of December 31, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Assets Cash and cash equivalents $ 1,292 $ 720 $ 114,207 $ - $ 116,219 Other current assets 249,293 217,822 279,626 (277,989 ) 468,752 Plant, equipment and timberlands, net 375,231 80,992 409,520 — 865,743 Investments in subsidiaries 829,895 653,128 — (1,483,023 ) — Other assets 139,552 — 140,529 — 280,081 Total assets $ 1,595,263 $ 952,662 $ 943,882 $ (1,761,012 ) $ 1,730,795 Liabilities and Shareholders' Equity Current liabilities $ 402,787 $ 54,640 $ 167,738 $ (277,989 ) $ 347,176 Long-term debt 368,496 51,000 50,602 — 470,098 Deferred income taxes 14,081 16,814 52,676 — 83,571 Other long-term liabilities 100,971 313 19,738 — 121,022 Total liabilities 886,335 122,767 290,754 (277,989 ) 1,021,867 Shareholders’ equity 708,928 829,895 653,128 (1,483,023 ) 708,928 Total liabilities and shareholders’ equity $ 1,595,263 $ 952,662 $ 943,882 $ (1,761,012 ) $ 1,730,795 Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net cash provided (used) by Operating activities $ (4,089 ) $ (114 ) $ 24,241 $ (20,000 ) $ 38 Investing activities Expenditures for purchases of plant, equipment and timberlands (13,414 ) (12,902 ) (10,628 ) — (36,944 ) Proceeds from disposals of plant, equipment and timberlands, net 598 1,785 1 — 2,384 Advances of intercompany loans — (3,445 ) — 3,445 — Intercompany capital contributed — (315 ) — 315 — Intercompany capital returned — 20,000 — (20,000 ) — Other (68 ) — — — (68 ) Total investing activities (12,884 ) 5,123 (10,627 ) (16,240 ) (34,628 ) Financing activities Net borrowings (repayments) of long-term debt 25,660 16,000 (647 ) — 41,013 Payment of dividends to shareholders (11,368 ) — — — (11,368 ) Borrowings of intercompany loans 3,445 — — (3,445 ) — Intercompany capital received — — 315 (315 ) — Intercompany capital returned — — (20,000 ) 20,000 — Payment of intercompany dividend — (20,000 ) — 20,000 — Proceeds from government grants 125 — — — 125 Payments related to share-based compensation awards and other (980 ) — — — (980 ) Total financing activities 16,882 (4,000 ) (20,332 ) 36,240 28,790 Effect of exchange rate on cash — — (3,230 ) — (3,230 ) Net increase (decrease) in cash (91 ) 1,009 (9,948 ) — (9,030 ) Cash at the beginning of period 1,292 720 114,207 — 116,219 Cash at the end of period $ 1,201 $ 1,729 $ 104,259 $ — $ 107,189 Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net cash provided (used) by Operating activities $ (12,072 ) $ (1,085 ) $ 42,606 $ (685 ) $ 28,764 Investing activities Expenditures for purchases of plant, equipment and timberlands (40,739 ) (21,421 ) (8,887 ) — (71,047 ) Proceeds from disposals of plant, equipment and timberlands, net 8 75 — — 83 Repayments from intercompany loans — 12,000 — (12,000 ) — Advances of intercompany loans — (12,550 ) — 12,550 — Intercompany capital contributed — (400 ) — 400 — Total investing activities (40,731 ) (22,296 ) (8,887 ) 950 (70,964 ) Financing activities Net borrowings (repayments) of long-term debt 55,000 25,000 (16,292 ) — 63,708 Payment of dividends to shareholders (11,130 ) — — — (11,130 ) Repayments of intercompany loans — — (12,000 ) 12,000 — Borrowings of intercompany loans 12,550 — — (12,550 ) — Intercompany capital received — — 400 (400 ) — Payment of intercompany dividend — — (685 ) 685 — Payments related to share-based compensation awards and other (112 ) — — — (112 ) Total financing activities 56,308 25,000 (28,577 ) (265 ) 52,466 Effect of exchange rate on cash — — 3,732 — 3,732 Net increase in cash 3,505 1,619 8,874 — 13,998 Cash at the beginning of period 5,082 1,461 48,901 — 55,444 Cash at the end of period $ 8,587 $ 3,080 $ 57,775 $ — $ 69,442

Accounting Policies (Policies)

Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
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 that you have read the audited consolidated financial statements included in our 2017 Annual Report on Form 10-K.
Reclassification	Reclassification As a result of adopting the provisions of Accounting Standards Update (“ASU”) No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Cost we reclassified certain amounts of periodic benefit expense for previously reported periods from Cost of products sold and Selling, general and administrative expense to Non Operating Expense. As a result of applying the ASU, Costs of products sold for the second quarter of 2017 was increased by $0.7 million and Selling, general and administrative expenses were reduced by $0.4 million and the offsetting net reclassification reduced Non-operating expense by $0.3 million. The comparable amounts for the first six months of 2017 were $2.0 million, $0.7 million and $1.3 million, respectively.
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 that actual results may differ from those estimates and assumptions.
Revenue Recognition	Revenue Recognition We adopted ASU No. 2014-09, Revenue from Contracts with Customers in the first quarter of 2018. This ASU clarifies the principles for recognizing revenue and establishes expanded disclosure requirements; however, the adoption of ASU No. 2014-09 had no impact on the timing or amount of revenue recognized for any period presented. Refer to Note 4 for additional information about the disaggregation of our net sales. Our revenue is earned primarily from the manufacture and sale of specialty papers and engineered materials (“product sales”). Revenue is earned pursuant to contracts, supply agreements and other arrangements with a wide variety of customers. Our performance obligation is to produce a specified product according to technical specifications and, in substantially all instances, to deliver the product. Revenue from product sales is earned at a point in time. We recognize revenue on product sales when we have satisfied our performance obligation and control of the product has passed to the customer thereby entitling us to payment. With respect to substantially all arrangements for product sales, this is deemed to occur when title transfers in accordance with specified shipping terms. The prices are fixed at the time the sales arrangement is entered into and payment terms are customary for similar arrangements in our industry. Many of our agreements include customary provisions for volume rebates, discounts and similar incentives. In addition, we are obligated for products that fail to meet agreed upon specification. Provisions for such items are estimated and recorded as sales deductions in the period in which the related revenue is recognized. Revenue from power sales and renewable energy credits is recorded under the caption “Energy and related sales, net” in the condensed consolidated statements of income and is recognized upon fulfillment of our performance obligation which is generally upon meeting capacity commitments or delivery of REC certificates. Revenue from energy sales is recognized when electricity is delivered to the customer. Prices for power sales and renewable energy credits are fixed at the time of sale and payment is generally due within normal terms and conditions customary for the industry. Certain costs associated with the production of electricity, such as fuel, labor, depreciation and maintenance are netted against energy sales for presentation on the condensed consolidated statements of income.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2018, the FASB issued ASU No. 2018-02, “Reclassification of Certain Tax Effects From Accumulated Other Comprehensive Income. (“ASU No. 2018-02” ).” In December 2017, Tax Cuts and Jobs Act (“TCJA”) was passed into law and, among other provisions, reduced the statutory federal tax rate from 35% to 21%. The change in the tax rate impacted the carrying value of deferred tax assets and liabilities. ASU No. 2018-02 allows a reclassification from accumulated other comprehensive income (“AOCI”) to retained earnings for stranded tax effects resulting from the TCJA. We elected to adopt ASU No. 2018-02 in the first quarter of 2018, and we reclassified $22.3 million of net deferred tax benefits from AOCI to retained earnings. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In August 2017, the FASB issued ASU No. 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities"

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2018
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 June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Composite Fibers Food & beverage $ 70,186 $ 65,434 $ 140,583 $ 128,036 Wallcovering 27,789 26,173 55,921 48,628 Technical specialties 21,609 17,676 42,567 35,383 Composite laminates 8,960 9,255 18,358 18,094 Metallized 14,390 14,599 27,102 28,100 142,934 133,137 284,531 258,241 Advanced Airlaid Materials Feminine hygiene 46,937 44,503 95,410 86,927 Specialty wipes 10,495 6,992 18,262 13,042 Adult incontinence 5,190 3,220 9,622 6,864 Home care 3,875 3,169 7,902 5,927 Other 6,311 4,952 11,224 9,914 72,808 62,836 142,420 122,674 Specialty Papers Carbonless & forms 69,743 70,976 141,613 148,048 Engineered products 51,697 47,113 101,648 95,275 Envelope & converting 36,051 36,765 73,956 79,622 Book publishing 31,963 36,111 70,521 73,284 Other 577 403 1,731 911 190,031 191,368 389,469 397,140 TOTAL $ 405,773 $ 387,342 $ 816,420 $ 778,055 Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Composite Fibers Europe, Middle East and Africa $ 91,790 $ 84,041 $ 186,572 $ 167,588 Americas 28,992 27,477 53,040 50,536 Asia Pacific 22,152 21,619 44,919 40,117 142,934 133,137 284,531 258,241 Advanced Airlaid Materials Europe, Middle East and Africa 35,905 32,404 72,133 62,133 Americas 36,310 30,011 69,128 59,932 Asia Pacific 593 421 1,159 609 72,808 62,836 142,420 122,674 Specialty Papers Americas 188,505 190,546 386,333 395,321 Other 1,526 822 3,136 1,819 190,031 191,368 389,469 397,140 TOTAL $ 405,773 $ 387,342 $ 816,420 $ 778,055

Gains on Dispositions of Plan27

Gains on Dispositions of Plant, Equipment and Timberlands (Tables)	6 Months Ended
	Jun. 30, 2018
Property Plant And Equipment [Abstract]
Summary for Sale of Timberlands and Other Assets	During the first six months of 2018 and 2017 we completed the following sales of assets: Dollars in thousands Acres Proceeds Gain (loss) 2018 Timberlands 1,029 $ 1,785 $ 1,680 Other n/a 599 453 Total $ 2,384 $ 2,133 2017 Timberlands 46 $ 75 $ 74 Other n/a 8 (48 ) Total $ 83 $ 26

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Details of Basic and Diluted Earnings Per Share (EPS)	The following table sets forth the details of basic and diluted earnings per share (“EPS”): Three months ended June 30 In thousands, except per share 2018 2017 Net loss $ (7,399 ) $ (5,714 ) Weighted average common shares outstanding used in basic EPS 43,770 43,604 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — — Weighted average common shares outstanding and common share equivalents used in diluted EPS 43,770 43,604 Loss per share Basic $ (0.17 ) $ (0.13 ) Diluted (0.17 ) (0.13 ) Six months ended June 30 In thousands, except per share 2018 2017 Net income (loss) $ (1,683 ) $ 5,889 Weighted average common shares outstanding used in basic EPS 43,735 43,593 Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs — 856 Weighted average common shares outstanding and common share equivalents used in diluted EPS 43,735 44,449 Earnings (loss) per share Basic $ (0.04 ) $ 0.14 Diluted (0.04 ) 0.13
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 period indicated, because their effect would be anti-dilutive: June 30 In thousands 2018 2017 Three months ended 2,393 1,327 Six months ended 2,393 591

Accumulated Other Comprehensi29

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2018
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 six months ended June 30, 2018 and 2017. 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 April 1, 2018 (29,092 ) (5,894 ) (118,428 ) 4,461 (148,953 ) Other comprehensive income (loss) before reclassifications (net of tax) (33,223 ) 3,368 — — (29,855 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 1,181 3,261 (240 ) 4,202 Net current period other comprehensive income (loss) (33,223 ) 4,549 3,261 (240 ) (25,653 ) Balance at June 30, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Balance at April 1, 2017 $ (94,383 ) $ 554 $ (108,466 ) $ 4,882 $ (197,413 ) Other comprehensive income (loss) before reclassifications (net of tax) 27,504 (3,080 ) — (106 ) 24,318 Amounts reclassified from accumulated other comprehensive income (net of tax) — (571 ) 2,642 (57 ) 2,014 Net current period other comprehensive income (loss) 27,504 (3,651 ) 2,642 (163 ) 26,332 Balance at June 30, 2017 $ (66,879 ) $ (3,097 ) $ (105,824 ) $ 4,719 $ (171,081 ) 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, 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) (20,476 ) 151 — — (20,325 ) Amounts reclassified from accumulated other comprehensive income (net of tax) — 2,596 6,425 (329 ) 8,692 Net current period other comprehensive income (loss) (20,476 ) 2,747 6,425 (329 ) (11,633 ) Balance at June 30, 2018 $ (62,315 ) $ (1,345 ) $ (115,167 ) $ 4,221 $ (174,606 ) Balance at January 1, 2017 $ (100,448 ) $ 1,500 $ (110,656 ) $ 4,998 $ (204,606 ) Other comprehensive income (loss) before reclassifications (net of tax) 33,569 (3,335 ) — (106 ) 30,128 Amounts reclassified from accumulated other comprehensive income (net of tax) — (1,262 ) 4,832 (173 ) 3,397 Net current period other comprehensive income (loss) 33,569 (4,597 ) 4,832 (279 ) 33,525 Balance at June 30, 2017 $ (66,879 ) $ (3,097 ) $ (105,824 ) $ 4,719 $ (171,081 )
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 June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Description Line Item in Statements of Income Cash flow hedges (Note 13) (Gains) losses on cash flow hedges $ 1,636 $ (785 ) $ 3,595 $ (1,716 ) Costs of products sold Tax expense (benefit) (455 ) 214 (999 ) 454 Income tax provision (benefit) Net of tax 1,181 (571 ) 2,596 (1,262 ) Retirement plan obligations (Note 8) Amortization of deferred benefit pension plans Prior service costs 781 708 1,561 1,412 Other, net Actuarial losses 3,523 3,311 6,913 6,133 Other, net 4,304 4,019 8,474 7,545 Tax benefit (1,043 ) (1,377 ) (2,049 ) (2,713 ) Income tax provision (benefit) Net of tax 3,261 2,642 6,425 4,832 Amortization of deferred benefit other plans Prior service costs (46 ) (46 ) (91 ) (91 ) Other, net Actuarial gains (272 ) (46 ) (345 ) (189 ) Other, net (318 ) (92 ) (436 ) (280 ) Tax expense 78 35 107 107 Income tax provision (benefit) Net of tax (240 ) (57 ) (329 ) (173 ) Total reclassifications, net of tax $ 4,202 $ 2,014 $ 8,692 $ 3,397

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
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 2014 - 2017 N/A State 2013 - 2017 2014 - 2016 Canada (1) 2010-2013; 2017 2014 - 2016 Germany (1) 2016 - 2017 2011 - 2015 France 2015 - 2017 2012 United Kingdom 2016 - 2017 N/A Philippines 2015, 2017 2016 (1) includes provincial or similar local jurisdictions, as applicable
Summary of Information Related to Interest and Penalties on Uncertain Tax Positions	The following table summarizes information related to interest and penalties on uncertain tax positions: Six months ended June 30 In millions 2018 2017 Interest expense (income) $ 0.2 $ 0.3 Penalties — — June 30 December 31 2018 2017 Accrued interest payable $ 1.0 $ 0.8

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Summary of Share Based Compensation Activity	The following table summarizes RSU and PSA activity during periods indicated: Units 2018 2017 Balance at January 1, 929,386 679,038 Granted 389,065 364,748 Forfeited (70,891 ) (91,449 ) Shares delivered (150,020 ) (24,052 ) Balance at June 30, 1,097,540 928,285
Compensation Expense for Stock Option Activity	The following table sets forth aggregate RSU and PSA compensation expense for the periods indicated: June 30 In thousands 2018 2017 Three months ended $ 1,651 $ 1,049 Six months ended 3,455 2,088
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Summary of Share Based Compensation Activity	The following table sets forth information related to outstanding SOSARS for the six months ended June 30; 2018 2017 SOSARS Shares Wtd Avg Exercise Price Shares Wtd Avg Exercise Price Outstanding at January 1, 2,561,846 $ 17.87 2,736,616 $ 17.64 Granted — — — — Exercised (148,145 ) 13.26 (33,050 ) 14.65 Canceled / forfeited (20,994 ) 18.76 (17,630 ) 18.46 Outstanding at June 30, 2,392,707 $ 18.15 2,685,936 $ 17.67
Compensation Expense for Stock Option Activity	The following table sets forth SOSAR compensation expense for the periods indicated: June 30 In thousands 2018 2017 Three months ended $ 70 $ 259 Six months ended 249 868

Retirement Plans and Other Po32

Retirement Plans and Other Post-Retirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Periodic Costs of Pension and Post Retirement Medical Benefit Plans	The following tables provide information with respect to the net periodic costs of our pension and post-retirement medical benefit plans. Three months ended June 30 In thousands 2018 2017 Pension Benefits Service cost $ 2,747 $ 2,649 Interest cost 5,626 5,989 Expected return on plan assets (10,722 ) (10,666 ) Amortization of prior service cost 781 708 Amortization of unrecognized loss 3,523 3,311 Total net periodic benefit cost $ 1,955 $ 1,991 Other Benefits Service cost $ 238 $ 284 Interest cost 410 513 Amortization of prior service credit (46 ) (46 ) Amortization of actuarial gain (272 ) (46 ) Total net periodic benefit cost $ 330 $ 705 Six months ended June 30 In thousands 2018 2017 Pension Benefits Service cost $ 5,606 $ 5,370 Interest cost 11,215 11,896 Expected return on plan assets (21,561 ) (21,497 ) Amortization of prior service cost 1,561 1,412 Amortization of unrecognized loss 6,913 6,133 Total net periodic benefit cost $ 3,734 $ 3,314 Other Benefits Service cost $ 545 $ 579 Interest cost 861 998 Amortization of prior service credit (91 ) (91 ) Amortization of actuarial gain (345 ) (189 ) Total net periodic benefit cost $ 970 $ 1,297

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventories, Net of Reserves	Inventories, net of reserves, were as follows: June 30 December 31 In thousands 2018 2017 Raw materials $ 65,426 $ 60,806 In-process and finished 127,311 116,678 Supplies 78,258 74,580 Total $ 270,995 $ 252,064

Capitalized Interest (Tables)

Capitalized Interest (Tables)	6 Months Ended
	Jun. 30, 2018
Interest Expense [Abstract]
Summary of Interest Incurred, Capitalized and Expensed	The following table sets forth details of interest incurred, capitalized and expensed: Three months ended June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Interest cost incurred $ 5,814 $ 4,880 $ 11,405 $ 9,477 Interest capitalized - 404 396 993 Interest expense $ 5,814 $ 4,476 $ 11,009 $ 8,484

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt is summarized as follows: June 30 December 31 In thousands 2018 2017 Revolving credit facility, due Mar. 2020 $ 217,860 $ 171,200 5.375% Notes, due Oct. 2020 250,000 250,000 2.40% Term Loan, due Jun. 2022 6,661 7,710 2.05% Term Loan, due Mar. 2023 29,556 33,607 1.30% Term Loan, due Jun. 2023 8,327 9,423 1.55% Term Loan, due Sep. 2025 10,356 11,390 Total long-term debt 522,760 483,330 Less current portion (10,982 ) (11,298 ) Unamortized deferred issuance costs (1,601 ) (1,934 ) Long-term debt, net of current portion $ 510,177 $ 470,098
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 Instr36

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
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: June 30, 2018 December 31, 2017 In thousands Carrying Value Fair Value Carrying Value Fair Value Variable rate debt $ 217,860 $ 217,860 $ 171,200 $ 171,200 Fixed-rate bonds 250,000 252,375 250,000 253,823 2.40% Term loan 6,661 6,813 7,710 7,889 2.05% Term loan 29,556 30,032 33,607 34,122 1.30% Term Loan 8,327 8,302 9,423 9,370 1.55% Term loan 10,356 10,323 11,390 11,320 Total $ 522,760 $ 525,705 $ 483,330 $ 487,724

Financial Derivatives and Hed37

Financial Derivatives and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2018
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 June 30 2018 December 31 2017 June 30 2018 December 31 2017 Prepaid Expenses and Other Other Balance sheet caption Current Assets Current Liabilities Designated as hedging: Forward foreign currency exchange contracts $ 1,085 $ 1,066 $ 1,419 $ 4,787 Not designated as hedging: Forward foreign currency exchange contracts $ 351 $ 151 $ 422 $ 43
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 June 30 Six months ended June 30 In thousands 2018 2017 2018 2017 Designated as hedging: Forward foreign currency exchange contracts: Effective portion – cost of products sold $ (1,636 ) $ 785 $ (3,595 ) $ 1,716 Ineffective portion – other – net 110 36 (212 ) 86 Not designated as hedging: Forward foreign currency exchange contracts: Other – net $ (898 ) $ 370 $ (601 ) $ 391
Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss)	A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income (loss) is as follows: In thousands 2018 2017 Balance at January 1, $ (5,640 ) $ 1,882 Deferred (losses) gains on cash flow hedges 288 (4,801 ) Reclassified to earnings 3,595 (1,716 ) Balance at June 30, $ (1,757 ) $ (4,635 )
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 June 30 2018 December 31 2017 Derivative Sell/Buy - sell notional Philippine Peso / British Pound — 19,047 Euro / British Pound 12,230 13,586 Euro / U.S. Dollar — 1,048 U.S. Dollar / Euro 349 946 Sell/Buy - buy notional Euro / Philippine Peso 1,031,730 890,096 British Pound / Philippine Peso 767,306 797,496 U.S. Dollar / Euro 1,310 4,253 Euro / U.S. Dollar 68,673 60,519 U.S. Dollar / Canadian Dollar 32,280 32,265 British Pound / Euro — 335
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 June 30 2018 December 31 2017 Derivative Sell/Buy - sell notional U.S. Dollar / British Pound 22,500 17,500 British Pound / Euro 1,000 1,000 Canadian / U.S. dollar 2,500 - Sell/Buy - buy notional Euro / U.S. Dollar 6,000 4,500 British Pound / Euro 9,000 13,000

Commitments, Contingencies an38

Commitments, Contingencies and Legal Proceedings (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Reserves	Reserves for the Site. Our reserve for all remaining claims against us relating to PCB contamination is set forth below: Six months ended June 30 In thousands 2018 2017 Balance at January 1, $ 43,144 $ 52,788 Payments (2,708 ) (128 ) Assumption of WTM I escrow 4,746 - Accretion 66 - Balance at June 30, $ 45,248 $ 52,660

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Schedule of Financial and Other Information by Business Unit	The following tables set forth financial and other information by business unit for the period indicated: Three months ended June 30 Advanced Airlaid Other and Dollars in millions Composite Fibers Materials Specialty Papers Unallocated Total 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net sales $ 142.9 $ 133.1 $ 72.8 $ 62.8 $ 190.0 $ 191.4 $ — $ — $ 405.8 $ 387.3 Energy and related sales, net — — — — 0.9 1.0 — — 0.9 1.0 Total revenue 142.9 133.1 72.8 62.8 190.9 192.4 — — 406.7 388.3 Cost of products sold 118.0 107.6 62.8 53.0 200.6 195.6 3.7 2.4 385.1 358.6 Gross profit (loss) 24.9 25.5 10.0 9.8 (9.7 ) (3.2 ) (3.7 ) (2.4 ) 21.6 29.7 SG&A 11.7 10.8 2.4 2.3 11.2 10.3 6.3 8.1 31.6 31.5 (Gains) losses on dispositions of plant, equipment and timberlands, net — — — — — — (0.6 ) — (0.6 ) — Total operating income (loss) 13.2 14.7 7.6 7.5 (20.9 ) (13.5 ) (9.4 ) (10.5 ) (9.4 ) (1.8 ) Non-operating expense — — — — — — (6.0 ) (4.3 ) (6.0 ) (4.3 ) Income (loss) before income taxes $ 13.2 $ 14.7 $ 7.6 $ 7.5 $ (20.9 ) $ (13.5 ) $ (15.4 ) $ (14.8 ) $ (15.4 ) $ (6.1 ) Supplementary Data Net tons sold (thousands) 40.4 41.9 27.0 25.5 173.2 184.1 — — 240.6 251.5 Depreciation, depletion and amortization $ 7.2 $ 7.0 $ 3.5 $ 2.3 $ 8.2 $ 7.7 $ 1.2 $ 0.7 $ 20.1 $ 17.7 Capital expenditures 2.8 2.1 2.5 12.9 4.5 15.8 0.6 3.5 10.4 34.3 Six months ended June 30 Advanced Airlaid Other and Dollars in millions Composite Fibers Materials Specialty Papers Unallocated Total 2018 2017 2018 2017 2018 2017 2018 2017 2018 2017 Net sales $ 284.5 $ 258.2 $ 142.4 $ 122.7 $ 389.5 $ 397.1 $ — $ — $ 816.4 $ 778.1 Energy and related sales, net — — — — 2.4 2.1 — — 2.4 2.1 Total revenue 284.5 258.2 142.4 122.7 391.9 399.2 — — 818.8 780.2 Cost of products sold 232.7 207.2 122.5 103.5 387.1 375.6 6.0 8.5 748.3 694.8 Gross profit (loss) 51.8 51.0 19.9 19.2 4.8 23.6 (6.0 ) (8.5 ) 70.5 85.4 SG&A 23.3 21.9 5.1 4.6 23.3 23.6 16.9 16.3 68.6 66.4 (Gains) losses on dispositions of plant, equipment and timberlands, net — — — — — — (2.1 ) — (2.1 ) — Total operating income (loss) 28.5 29.1 14.8 14.6 (18.5 ) --- (20.8 ) (24.7 ) 4.0 19.0 Non-operating expense — — — — — — (11.0 ) (7.4 ) (11.0 ) (7.4 ) Income (loss) before income taxes $ 28.5 $ 29.1 $ 14.8 $ 14.6 $ (18.5 ) $ — $ (31.8 ) $ (32.1 ) $ (6.9 ) $ 11.6 Supplementary Data Net tons sold (thousands) 80.5 80.7 53.3 50.3 361.6 381.4 — — 495.4 512.4 Depreciation, depletion and amortization $ 14.6 $ 13.8 $ 6.3 $ 4.6 $ 16.3 $ 14.9 $ 2.3 $ 1.7 $ 39.5 $ 35.0 Capital expenditures 7.9 6.8 15.6 23.5 11.0 34.0 2.4 6.7 36.9 71.0

Condensed Consolidating Finan40

Condensed Consolidating Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2018
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Income	Condensed Consolidating Statement of Income for the three months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 190,032 $ 32,319 $ 208,579 $ (25,157 ) $ 405,773 Energy and related sales, net 944 — — — 944 Total revenues 190,976 32,319 208,579 (25,157 ) 406,717 Costs of products sold 203,339 31,097 175,835 (25,157 ) 385,114 Gross profit (loss) (12,363 ) 1,222 32,744 — 21,603 Selling, general and administrative expenses 16,971 (332 ) 14,922 — 31,561 (Gain) loss on dispositions of plant equipment and timberlands, net (22 ) (565 ) 8 — (579 ) Operating income (loss) (29,312 ) 2,119 17,814 — (9,379 ) Other non-operating income (expense) Interest expense (6,389 ) (585 ) (446 ) 1,606 (5,814 ) Interest income 133 1,446 53 (1,606 ) 26 Equity in earnings of subsidiaries 14,971 12,707 — (27,678 ) — Other, net 1,532 529 (2,318 ) — (257 ) Total other non-operating income (expense) 10,247 14,097 (2,711 ) (27,678 ) (6,045 ) Income (loss) before income taxes (19,065 ) 16,216 15,103 (27,678 ) (15,424 ) Income tax provision (benefit) (11,666 ) 1,267 2,374 — (8,025 ) Net income (loss) (7,399 ) 14,949 12,729 (27,678 ) (7,399 ) Other comprehensive income (loss) (25,653 ) (28,587 ) (28,149 ) 56,736 (25,653 ) Comprehensive income (loss) $ (33,052 ) $ (13,638 ) $ (15,420 ) $ 29,058 $ (33,052 ) Condensed Consolidating Statement of Income for the six months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 389,471 $ 52,332 $ 424,714 $ (50,097 ) $ 816,420 Energy and related sales, net 2,372 — — — 2,372 Total revenues 391,843 52,332 424,714 (50,097 ) 818,792 Costs of products sold 394,504 49,362 354,514 (50,097 ) 748,283 Gross profit (loss) (2,661 ) 2,970 70,200 — 70,509 Selling, general and administrative expenses 37,408 1,673 29,543 — 68,624 (Gain) loss on dispositions of plant equipment and timberlands, net (460 ) (1,680 ) 7 — (2,133 ) Operating income (loss) (39,609 ) 2,977 40,650 — 4,018 Other non-operating income (expense) Interest expense (12,071 ) (1,040 ) (874 ) 2,976 (11,009 ) Interest income 279 2,690 87 (2,976 ) 80 Equity in earnings of subsidiaries 36,204 34,962 — (71,166 ) Other, net (881 ) (2,734 ) 3,587 — (28 ) Total other non-operating income (expense) 23,531 33,878 2,800 (71,166 ) (10,957 ) Income (loss) before income taxes (16,078 ) 36,855 43,450 (71,166 ) (6,939 ) Income tax provision (benefit) (14,395 ) 673 8,466 — (5,256 ) Net income (loss) (1,683 ) 36,182 34,984 (71,166 ) (1,683 ) Other comprehensive income (loss) (11,633 ) (17,551 ) (16,114 ) 33,665 (11,633 ) Comprehensive income (loss) $ (13,316 ) $ 18,631 $ 18,870 $ (37,501 ) $ (13,316 ) Condensed Consolidating Statement of Income for the three months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 191,370 $ 23,052 $ 194,708 $ (21,788 ) $ 387,342 Energy and related sales, net 981 — — — 981 Total revenues 192,351 23,052 194,708 (21,788 ) 388,323 Costs of products sold 196,145 22,047 162,184 (21,788 ) 358,588 Gross profit (3,794 ) 1,005 32,524 — 29,735 Selling, general and administrative expenses 16,421 236 14,888 — 31,545 (Gain) loss on dispositions of plant equipment and timberlands, net 16 (74 ) — — (58 ) Operating income (loss) (20,231 ) 843 17,636 — (1,752 ) Other non-operating income (expense) Interest expense (5,182 ) (206 ) (437 ) 1,349 (4,476 ) Interest income 142 1,237 15 (1,349 ) 45 Equity in earnings of subsidiaries 18,801 19,249 — (38,050 ) Other, net 781 (2,319 ) 1,636 — 98 Total other non-operating income (expense) 14,542 17,961 1,214 (38,050 ) (4,333 ) Income (loss) before income taxes (5,689 ) 18,804 18,850 (38,050 ) (6,085 ) Income tax provision (benefit) 25 3 (399 ) — (371 ) Net income (loss) (5,714 ) 18,801 19,249 (38,050 ) (5,714 ) Other comprehensive income 26,332 23,964 23,371 (47,335 ) 26,332 Comprehensive income $ 20,618 $ 42,765 $ 42,620 $ (85,385 ) $ 20,618 Condensed Consolidating Statement of Income for the six months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net sales $ 397,141 $ 42,585 $ 380,595 $ (42,266 ) $ 778,055 Energy and related sales, net 2,110 — — — 2,110 Total revenues 399,251 42,585 380,595 (42,266 ) 780,165 Costs of products sold 381,391 40,633 315,043 (42,266 ) 694,801 Gross profit 17,860 1,952 65,552 — 85,364 Selling, general and administrative expenses 36,583 310 29,529 — 66,422 (Gain) loss on dispositions of plant equipment and timberlands, net 48 (74 ) — — (26 ) Operating income (loss) (18,771 ) 1,716 36,023 — 18,968 Other non-operating income (expense) Interest expense (9,843 ) (319 ) (941 ) 2,619 (8,484 ) Interest income 291 2,398 88 (2,619 ) 158 Equity in earnings of subsidiaries 32,418 33,101 - (65,519 ) Other, net 2,365 (4,525 ) 3,070 — 910 Total other non-operating income (expense) 25,231 30,655 2,217 (65,519 ) (7,416 ) Income before income taxes 6,460 32,371 38,240 (65,519 ) 11,552 Income tax provision (benefit) 571 (47 ) 5,139 — 5,663 Net income 5,889 32,418 33,101 (65,519 ) 5,889 Other comprehensive income 33,525 29,066 28,385 (57,451 ) 33,525 Comprehensive income $ 39,414 $ 61,484 $ 61,486 $ (122,970 ) $ 39,414
Condensed Consolidating Balance Sheet	Condensed Consolidating Balance Sheet as of June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Assets Cash and cash equivalents $ 1,201 $ 1,729 $ 104,259 $ - $ 107,189 Other current assets 262,122 256,018 295,167 (316,171 ) 497,136 Plant, equipment and timberlands, net 367,703 86,461 390,303 — 844,467 Investments in subsidiaries 837,670 652,335 — (1,490,005 ) — Other assets 144,794 — 143,511 — 288,305 Total assets $ 1,613,490 $ 996,543 $ 933,240 $ (1,806,176 ) $ 1,737,097 Liabilities and Shareholders' Equity Current liabilities $ 422,603 $ 81,975 $ 148,468 $ (316,171 ) $ 336,875 Long-term debt 394,462 67,000 48,715 — 510,177 Deferred income taxes 3,201 18,542 54,321 — 76,064 Other long-term liabilities 106,272 485 20,272 — 127,029 Total liabilities 926,538 168,002 271,776 (316,171 ) 1,050,145 Shareholders’ equity 686,952 828,541 661,464 (1,490,005 ) 686,952 Total liabilities and shareholders’ equity $ 1,613,490 $ 996,543 $ 933,240 $ (1,806,176 ) $ 1,737,097 Condensed Consolidating Balance Sheet as of December 31, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Assets Cash and cash equivalents $ 1,292 $ 720 $ 114,207 $ - $ 116,219 Other current assets 249,293 217,822 279,626 (277,989 ) 468,752 Plant, equipment and timberlands, net 375,231 80,992 409,520 — 865,743 Investments in subsidiaries 829,895 653,128 — (1,483,023 ) — Other assets 139,552 — 140,529 — 280,081 Total assets $ 1,595,263 $ 952,662 $ 943,882 $ (1,761,012 ) $ 1,730,795 Liabilities and Shareholders' Equity Current liabilities $ 402,787 $ 54,640 $ 167,738 $ (277,989 ) $ 347,176 Long-term debt 368,496 51,000 50,602 — 470,098 Deferred income taxes 14,081 16,814 52,676 — 83,571 Other long-term liabilities 100,971 313 19,738 — 121,022 Total liabilities 886,335 122,767 290,754 (277,989 ) 1,021,867 Shareholders’ equity 708,928 829,895 653,128 (1,483,023 ) 708,928 Total liabilities and shareholders’ equity $ 1,595,263 $ 952,662 $ 943,882 $ (1,761,012 ) $ 1,730,795
Condensed Consolidating Statement of Cash Flows	Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2018 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net cash provided (used) by Operating activities $ (4,089 ) $ (114 ) $ 24,241 $ (20,000 ) $ 38 Investing activities Expenditures for purchases of plant, equipment and timberlands (13,414 ) (12,902 ) (10,628 ) — (36,944 ) Proceeds from disposals of plant, equipment and timberlands, net 598 1,785 1 — 2,384 Advances of intercompany loans — (3,445 ) — 3,445 — Intercompany capital contributed — (315 ) — 315 — Intercompany capital returned — 20,000 — (20,000 ) — Other (68 ) — — — (68 ) Total investing activities (12,884 ) 5,123 (10,627 ) (16,240 ) (34,628 ) Financing activities Net borrowings (repayments) of long-term debt 25,660 16,000 (647 ) — 41,013 Payment of dividends to shareholders (11,368 ) — — — (11,368 ) Borrowings of intercompany loans 3,445 — — (3,445 ) — Intercompany capital received — — 315 (315 ) — Intercompany capital returned — — (20,000 ) 20,000 — Payment of intercompany dividend — (20,000 ) — 20,000 — Proceeds from government grants 125 — — — 125 Payments related to share-based compensation awards and other (980 ) — — — (980 ) Total financing activities 16,882 (4,000 ) (20,332 ) 36,240 28,790 Effect of exchange rate on cash — — (3,230 ) — (3,230 ) Net increase (decrease) in cash (91 ) 1,009 (9,948 ) — (9,030 ) Cash at the beginning of period 1,292 720 114,207 — 116,219 Cash at the end of period $ 1,201 $ 1,729 $ 104,259 $ — $ 107,189 Condensed Consolidating Statement of Cash Flows for the six months ended June 30, 2017 In thousands Parent Company Guarantors Non Guarantors Adjustments/ Eliminations Consolidated Net cash provided (used) by Operating activities $ (12,072 ) $ (1,085 ) $ 42,606 $ (685 ) $ 28,764 Investing activities Expenditures for purchases of plant, equipment and timberlands (40,739 ) (21,421 ) (8,887 ) — (71,047 ) Proceeds from disposals of plant, equipment and timberlands, net 8 75 — — 83 Repayments from intercompany loans — 12,000 — (12,000 ) — Advances of intercompany loans — (12,550 ) — 12,550 — Intercompany capital contributed — (400 ) — 400 — Total investing activities (40,731 ) (22,296 ) (8,887 ) 950 (70,964 ) Financing activities Net borrowings (repayments) of long-term debt 55,000 25,000 (16,292 ) — 63,708 Payment of dividends to shareholders (11,130 ) — — — (11,130 ) Repayments of intercompany loans — — (12,000 ) 12,000 — Borrowings of intercompany loans 12,550 — — (12,550 ) — Intercompany capital received — — 400 (400 ) — Payment of intercompany dividend — — (685 ) 685 — Payments related to share-based compensation awards and other (112 ) — — — (112 ) Total financing activities 56,308 25,000 (28,577 ) (265 ) 52,466 Effect of exchange rate on cash — — 3,732 — 3,732 Net increase in cash 3,505 1,619 8,874 — 13,998 Cash at the beginning of period 5,082 1,461 48,901 — 55,444 Cash at the end of period $ 8,587 $ 3,080 $ 57,775 $ — $ 69,442

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Federal income tax rate		21.00%		35.00%
Reclassification of net deferred tax benefits from AOCI to retained earnings				$ 22,298
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New accounting pronouncement, effect of change on operating income	$ (300)		$ (1,300)
Accounting Standards Update 2017-07 [Member] | Costs of Products Sold [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New accounting pronouncement, effect of change on operating income	700		2,000
Accounting Standards Update 2017-07 [Member] | Selling, General and Administrative Expenses [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New accounting pronouncement, effect of change on operating income	$ (400)		$ (700)
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Federal income tax rate		21.00%		35.00%
Reclassification of net deferred tax benefits from AOCI to retained earnings		$ 22,300

Proposed Acquisitions - Additio

Proposed Acquisitions - Additional Information (Details) - G P Business [Member] $ in Millions	Jun. 19, 2018USD ($)Employeet	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Business acquisition purchase price	$ 185
Business acquisition, date of definitive agreement	Jun. 19, 2018
Annual production capacity | t	32,000
Number of employees at manufacturing facility | Employee	220
Annual sales of acquiree		$ 99

Revenue - Summary of Disaggrega

Revenue - Summary of Disaggregated Information Pertaining to Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Net sales	$ 406,717	$ 388,323	$ 818,792	$ 780,165
Product [Member]
Disaggregation Of Revenue [Line Items]
Net sales	405,773	387,342	816,420	778,055
Composite Fibers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	142,934	133,137	284,531	258,241
Composite Fibers [Member] | Europe, Middle East and Africa [Member]
Disaggregation Of Revenue [Line Items]
Net sales	91,790	84,041	186,572	167,588
Composite Fibers [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Net sales	22,152	21,619	44,919	40,117
Composite Fibers [Member] | Americas [Member]
Disaggregation Of Revenue [Line Items]
Net sales	28,992	27,477	53,040	50,536
Composite Fibers [Member] | Food & Beverage [Member]
Disaggregation Of Revenue [Line Items]
Net sales	70,186	65,434	140,583	128,036
Composite Fibers [Member] | Wallcovering [Member]
Disaggregation Of Revenue [Line Items]
Net sales	27,789	26,173	55,921	48,628
Composite Fibers [Member] | Technical Specialties [Member]
Disaggregation Of Revenue [Line Items]
Net sales	21,609	17,676	42,567	35,383
Composite Fibers [Member] | Composite Laminates [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,960	9,255	18,358	18,094
Composite Fibers [Member] | Metallized [Member]
Disaggregation Of Revenue [Line Items]
Net sales	14,390	14,599	27,102	28,100
Composite Fibers [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Net sales	142,900	133,100	284,500	258,200
Advanced Airlaid Materials [Member]
Disaggregation Of Revenue [Line Items]
Net sales	72,808	62,836	142,420	122,674
Advanced Airlaid Materials [Member] | Europe, Middle East and Africa [Member]
Disaggregation Of Revenue [Line Items]
Net sales	35,905	32,404	72,133	62,133
Advanced Airlaid Materials [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Net sales	593	421	1,159	609
Advanced Airlaid Materials [Member] | Americas [Member]
Disaggregation Of Revenue [Line Items]
Net sales	36,310	30,011	69,128	59,932
Advanced Airlaid Materials [Member] | Feminine Hygiene [Member]
Disaggregation Of Revenue [Line Items]
Net sales	46,937	44,503	95,410	86,927
Advanced Airlaid Materials [Member] | Specialty Wipes [Member]
Disaggregation Of Revenue [Line Items]
Net sales	10,495	6,992	18,262	13,042
Advanced Airlaid Materials [Member] | Adult Incontinence [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,190	3,220	9,622	6,864
Advanced Airlaid Materials [Member] | Home Care [Member]
Disaggregation Of Revenue [Line Items]
Net sales	3,875	3,169	7,902	5,927
Advanced Airlaid Materials [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	6,311	4,952	11,224	9,914
Advanced Airlaid Materials [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Net sales	72,800	62,800	142,400	122,700
Specialty Papers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	190,900	192,400	391,900	399,200
Specialty Papers [Member] | Americas [Member]
Disaggregation Of Revenue [Line Items]
Net sales	188,505	190,546	386,333	395,321
Specialty Papers [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,526	822	3,136	1,819
Specialty Papers [Member] | Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	577	403	1,731	911
Specialty Papers [Member] | Carbonless & Forms [Member]
Disaggregation Of Revenue [Line Items]
Net sales	69,743	70,976	141,613	148,048
Specialty Papers [Member] | Engineered Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	51,697	47,113	101,648	95,275
Specialty Papers [Member] | Envelope & Converting [Member]
Disaggregation Of Revenue [Line Items]
Net sales	36,051	36,765	73,956	79,622
Specialty Papers [Member] | Book Publishing [Member]
Disaggregation Of Revenue [Line Items]
Net sales	31,963	36,111	70,521	73,284
Specialty Papers [Member] | Product [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 190,031	$ 191,368	$ 389,469	$ 397,140

Gains on Dispositions of Plan44

Gains on Dispositions of Plant, Equipment and Timberlands (Summary for Sale of Timberlands and Other Assets) (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)a	Jun. 30, 2017USD ($)a	Jun. 30, 2018USD ($)a	Jun. 30, 2017USD ($)a
Property, Plant and Equipment [Line Items]
Proceeds			$ 2,384	$ 83
Gain (loss)	$ 579	$ 58	$ 2,133	$ 26
Timberlands [Member]
Property, Plant and Equipment [Line Items]
Acres | a	1,029	46	1,029	46
Proceeds			$ 1,785	$ 75
Gain (loss)			1,680	74
Other [Member]
Property, Plant and Equipment [Line Items]
Proceeds			599	8
Gain (loss)			$ 453	$ (48)

Earnings Per Share - Details of

Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ (7,399)	$ (5,714)	$ (1,683)	$ 5,889
Weighted average common shares outstanding used in basic EPS	43,770	43,604	43,735	43,593
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs				856
Weighted average common shares outstanding and common share equivalents used in diluted EPS	43,770	43,604	43,735	44,449
Earnings (loss) per share
Basic	$ (0.17)	$ (0.13)	$ (0.04)	$ 0.14
Diluted	$ (0.17)	$ (0.13)	$ (0.04)	$ 0.13

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Potential common shares	2,393	1,327	2,393	591

Accumulated Other Comprehensi47

Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (148,953)	$ (197,413)	$ (140,675)	$ (204,606)
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)	(29,855)	24,318	(20,325)	30,128
Amounts reclassified from accumulated other comprehensive income (net of tax)	4,202	2,014	8,692	3,397
Net current period other comprehensive income (loss)	(25,653)	26,332	(11,633)	33,525
Ending Balance	(174,606)	(171,081)	(174,606)	(171,081)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(29,092)	(94,383)	(41,839)	(100,448)
Balance as adjusted at January 1, 2018			(41,839)
Other comprehensive income (loss) before reclassifications (net of tax)	(33,223)	27,504	(20,476)	33,569
Net current period other comprehensive income (loss)	(33,223)	27,504	(20,476)	33,569
Ending Balance	(62,315)	(66,879)	(62,315)	(66,879)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5,894)	554	(4,092)	1,500
Balance as adjusted at January 1, 2018			(4,092)
Other comprehensive income (loss) before reclassifications (net of tax)	3,368	(3,080)	151	(3,335)
Amounts reclassified from accumulated other comprehensive income (net of tax)	1,181	(571)	2,596	(1,262)
Net current period other comprehensive income (loss)	4,549	(3,651)	2,747	(4,597)
Ending Balance	(1,345)	(3,097)	(1,345)	(3,097)
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(118,428)	(108,466)	(98,295)	(110,656)
Amount reclassified for adoption of ASU No. 2018-02			(23,297)
Balance as adjusted at January 1, 2018			(121,592)
Amounts reclassified from accumulated other comprehensive income (net of tax)	3,261	2,642	6,425	4,832
Net current period other comprehensive income (loss)	3,261	2,642	6,425	4,832
Ending Balance	(115,167)	(105,824)	(115,167)	(105,824)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,461	4,882	3,551	4,998
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)		(106)		(106)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(240)	(57)	(329)	(173)
Net current period other comprehensive income (loss)	(240)	(163)	(329)	(279)
Ending Balance	$ 4,221	$ 4,719	$ 4,221	$ 4,719

Accumulated Other Comprehensi48

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	$ (385,114)	$ (358,588)	$ (748,283)	$ (694,801)
Other, net	257	(98)	28	(910)
Income tax provision (benefit)	8,025	371	5,256	(5,663)
Net income (loss)	(7,399)	(5,714)	(1,683)	5,889
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net income (loss)	4,202	2,014	8,692	3,397
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Income tax provision (benefit)	(1,043)	(1,377)	(2,049)	(2,713)
Net income (loss)	3,261	2,642	6,425	4,832
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	781	708	1,561	1,412
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	3,523	3,311	6,913	6,133
Costs and Expenses	4,304	4,019	8,474	7,545
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Income tax provision (benefit)	78	35	107	107
Net income (loss)	(240)	(57)	(329)	(173)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plans [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	(46)	(46)	(91)	(91)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plans [Member] | Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Other, net	(272)	(46)	(345)	(189)
Costs and Expenses	(318)	(92)	(436)	(280)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | Accumulated Net (Gain) Loss from Cash Flow Hedges Attributable to Parent
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	1,636	(785)	3,595	(1,716)
Income tax provision (benefit)	(455)	214	(999)	454
Net income (loss)	$ 1,181	$ (571)	$ 2,596	$ (1,262)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Federal income tax rate	21.00%	35.00%
Increase in effective tax rate due to GILTI provisions	10.00%
Gross unrecognized tax benefits	$ 28.2	$ 26.9
Unrecognized tax benefits that would impact effective tax rate	$ 18
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	$ 4.7
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)	6 Months Ended
	Jun. 30, 2018
Foreign Tax Authority [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Foreign Tax Authority [Member] | France [Member]
Income Tax Examination [Line Items]
Examination in progress	2,012
Foreign Tax Authority [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examination in progress	2,016
Minimum [Member] | United States - Federal [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,014
Minimum [Member] | United States - State [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,013
Examination in progress	2,014
Minimum [Member] | Foreign Tax Authority [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,010
Examination in progress	2,014
Minimum [Member] | Foreign Tax Authority [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,016
Examination in progress	2,011
Minimum [Member] | Foreign Tax Authority [Member] | France [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,015
Minimum [Member] | Foreign Tax Authority [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,016
Minimum [Member] | Foreign Tax Authority [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,015
Maximum [Member] | United States - Federal [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Maximum [Member] | United States - State [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Examination in progress	2,016
Maximum [Member] | Foreign Tax Authority [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,013
Examination in progress	2,016
Maximum [Member] | Foreign Tax Authority [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Examination in progress	2,015
Maximum [Member] | Foreign Tax Authority [Member] | France [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Maximum [Member] | Foreign Tax Authority [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017
Maximum [Member] | Foreign Tax Authority [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2,017

Income Taxes - Summary of Infor

Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Interest expense (income)	$ 0.2	$ 0.3
Accrued interest payable	$ 1		$ 0.8

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
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	183,355	163,274
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	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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	929,386	679,038
Granted	389,065	364,748
Forfeited	(70,891)	(91,449)
Shares delivered	(150,020)	(24,052)
Ending Balance	1,097,540	928,285

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense for Periods (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,651	$ 1,049	$ 3,455	$ 2,088
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 70	$ 259	$ 249	$ 868

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - Stock Only Stock Appreciation Rights (SOSARs) [Member] - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Outstanding	2,561,846	2,736,616
Exercised	(148,145)	(33,050)
Canceled / forfeited	(20,994)	(17,630)
Ending Balance, Outstanding	2,392,707	2,685,936
Beginning Balance, Weighted Average Exercise Price, Outstanding	$ 17.87	$ 17.64
Weighted Average Exercise Price, Exercised	13.26	14.65
Weighted Average Exercise Price, Canceled / forfeited	18.76	18.46
Ending Balance, Weighted Average Exercise Price, Outstanding	$ 18.15	$ 17.67

Retirement Plans and Other Po56

Retirement Plans and Other Post-Retirement Benefits - Schedule of Net Periodic Costs of Pension and Post Retirement Medical Benefit Plans (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,747	$ 2,649	$ 5,606	$ 5,370
Interest cost	5,626	5,989	11,215	11,896
Expected return on plan assets	(10,722)	(10,666)	(21,561)	(21,497)
Amortization of prior service cost/(credit)	781	708	1,561	1,412
Amortization of unrecognized/actuarial loss (gain)	3,523	3,311	6,913	6,133
Total net periodic benefit cost	1,955	1,991	3,734	3,314
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	238	284	545	579
Interest cost	410	513	861	998
Amortization of prior service cost/(credit)	(46)	(46)	(91)	(91)
Amortization of unrecognized/actuarial loss (gain)	(272)	(46)	(345)	(189)
Total net periodic benefit cost	$ 330	$ 705	$ 970	$ 1,297

Inventories - Inventories, Net

Inventories - Inventories, Net of Reserves (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 65,426	$ 60,806
In-process and finished	127,311	116,678
Supplies	78,258	74,580
Total	$ 270,995	$ 252,064

Capitalized Interest - Summary

Capitalized Interest - Summary of Interest Incurred, Capitalized and Expensed (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Expense [Abstract]
Interest cost incurred	$ 5,814	$ 4,880	$ 11,405	$ 9,477
Interest capitalized		404	396	993
Interest expense	$ 5,814	$ 4,476	$ 11,009	$ 8,484

Long-Term Debt - Summary of Lon

Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total long-term debt	$ 522,760	$ 483,330
Less current portion	(10,982)	(11,298)
Unamortized deferred issuance costs	(1,601)	(1,934)
Long-term debt, net of current portion	510,177	470,098
Revolving Credit Facility, Due Mar. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	217,860	171,200
5.375% Notes, Due Oct. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	250,000	250,000
Long-term debt, net of current portion	250,000	250,000
2.40% Term Loan, Due Jun. 2022 [Member]
Debt Instrument [Line Items]
Total long-term debt	6,661	7,710
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	29,556	33,607
1.30% Term Loan, Due Jun. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	8,327	9,423
1.55% Term Loan, Due Sep. 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 10,356	$ 11,390

Long-Term Debt - Summary of L60

Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
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%
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

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Mar. 12, 2015	Oct. 03, 2012
Debt Instrument [Line Items]
Debt instrument covenant compliance leverage ratio, threshold	3.5
Debt instrument covenant compliance leverage ratio, actual	3.1
5.375% Notes [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	Oct. 15, 2020
Aggregate principal amount				$ 250,000,000
Interest rate on debt	5.375%			5.375%
Frequency of interest payable	Semiannually
Debt instrument redemption	The 5.375% Notes are redeemable, in whole or in part, at any time on or after October 15, 2016 at the redemption prices specified in the applicable Indenture.
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 400,000,000
Long-term debt, maturity date	Mar. 12, 2020
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] | Daily Euro Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Federal fund rate spread	1.125%
Revolving Credit Facility [Member] | Daily Euro Rate [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	$ 5,200,000	$ 5,200,000
Letters of credit outstanding	$ 0

Long-Term Debt - Summary of Deb

Long-Term Debt - Summary of Debts Borrowed by Subsidiary (Detail) - IKB Deutsche Industriebank AG Borrowing Agreements [Member] - Glatfelter Gernsbach GmbH and Co KG [Member] - IKB Deutsche Industriebank AG Member - EUR (€) € in Thousands	May 04, 2016	Apr. 26, 2016	Oct. 10, 2015	Sep. 04, 2014	Apr. 11, 2013
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 Instr63

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 522,760	$ 483,330
Fair Value	525,705	487,724
Revolving Credit Facility Due Mar. 2020 And Nov. 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	217,860	171,200
Fair Value	217,860	171,200
5.375% Notes, Due Oct. 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	250,000	250,000
Fair Value	252,375	253,823
2.40% Term Loan, Due Jun. 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	6,661	7,710
Fair Value	6,813	7,889
2.05% Term Loan, Due Mar. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	29,556	33,607
Fair Value	30,032	34,122
1.30% Term Loan, Due Jun. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	8,327	9,423
Fair Value	8,302	9,370
1.55% Term Loan, Due Sep. 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	10,356	11,390
Fair Value	$ 10,323	$ 11,320

Fair Value of Financial Instr64

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Parenthetical) (Detail)	Jun. 30, 2018	Dec. 31, 2017
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%

Fair Value of Financial Instr65

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount of fixed rate debt	$ 510,177	$ 470,098
5.375% Notes, Due Oct. 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount of fixed rate debt	$ 250,000	$ 250,000
Interest rate on debt	5.375%	5.375%

Financial Derivatives and Hed66

Financial Derivatives and Hedging Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018
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 Hed67

Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Jun. 30, 2018USD ($)	Jun. 30, 2018EUR (€)	Jun. 30, 2018PHP (₱)	Jun. 30, 2018CAD ($)	Jun. 30, 2018GBP (£)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017PHP (₱)	Dec. 31, 2017CAD ($)	Dec. 31, 2017GBP (£)
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 | ₱								₱ 19,047,000
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		€ 12,230,000					€ 13,586,000
Cash Flow Hedges [Member] | Euro / U.S. Dollar [Member] | Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount							1,048,000
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 | $	$ 68,673,000					$ 60,519,000
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 | ₱			₱ 1,031,730,000					890,096,000
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 | ₱			₱ 767,306,000					₱ 797,496,000
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 | $				$ 32,280,000					$ 32,265,000
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		349,000					946,000
Cash Flow Hedges [Member] | U.S Dollar / Euro [Member] | Designated as Hedging [Member] | Buy Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount		1,310,000					4,253,000
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							335,000
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 | $	6,000,000					4,500,000
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 | £					£ 1,000,000					£ 1,000,000
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					€ 13,000,000
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 | $	$ 22,500,000					$ 17,500,000
Foreign Currency Hedges [Member] | Canadian / U.S. dollar [Member] | Not Designated as Hedging [Member] | Sell Notional [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $				$ 2,500,000

Financial Derivatives and Hed68

Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	$ 1,085	$ 1,066
Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	1,419	4,787
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	351	151
Not Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	$ 422	$ 43

Financial Derivatives and Hed69

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Costs of Products Sold [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Effective portion of derivative instruments, gain (loss)	$ (1,636)	$ 785	$ (3,595)	$ 1,716
Other - Net [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Ineffective portion of derivative instruments, gain (loss)	110	36	(212)	86
Other - Net [Member] | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ (898)	$ 370	$ (601)	$ 391

Financial Derivatives and Hed70

Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Balance at January 1,	$ (5,640)	$ 1,882
Deferred (losses) gains on cash flow hedges	288	(4,801)
Reclassified to earnings	3,595	(1,716)
Balance at June 30,	$ (1,757)	$ (4,635)

Commitments, Contingencies an71

Commitments, Contingencies and Legal Proceedings - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)Operable_Unit	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jul. 13, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
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
Assumption of escrow	$ 4,746,000
Reserve for Environmental liabilities, current portion	26,000,000				$ 26,000,000	$ 28,500,000
Other Long-Term Liabilities [Member]
Commitments Contingencies And Litigation [Line Items]
Reserve for Environmental liabilities, remaining portion					$ 19,200,000
NCR/Appvion Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Contribution payment towards remedial action and natural resource damages	75,000,000
Anticipated cost to complete work for remaining site remedy	200,000,000
Expected payments for governments unreimbursed past costs which are under dispute			$ 32,700,000
Unreimbursed recoverable cost			0
Unspent settlement money			4,600,000
NADAR [Member]
Commitments Contingencies And Litigation [Line Items]
Expected payments for governments unreimbursed past costs which are under dispute	105,000,000
Unspent settlement money	60,000,000
NADAR [Member] | Subsequent Event [Member]
Commitments Contingencies And Litigation [Line Items]
Expected payments for governments unreimbursed past costs which are under dispute				$ 105,000,000
Georgia Pacific [Member]
Commitments Contingencies And Litigation [Line Items]
Settlement payable amount	$ 9,500,000
Payment due date	2017-08
Maximum [Member]
Commitments Contingencies And Litigation [Line Items]
NCR costs and damages percentage	100.00%
Maximum [Member] | NCR/Appvion Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Estimated cost related to Fox River matter	$ 30,000,000
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
Minimum [Member] | GLT, GP and NCR [Member] | NCR/Appvion Consent Decree [Member]
Commitments Contingencies And Litigation [Line Items]
Contribution payment towards remedial action and natural resource damages	$ 1,000,000,000
OU2-5 [Member]
Commitments Contingencies And Litigation [Line Items]
Estimated future cost of cleanup work		$ 13,400,000	$ 13,400,000
Expected cleanup work continuation year	through 2,019
NCR costs and damages percentage	100.00%
OU2-5 [Member] | Whiting Litigation [Member]
Commitments Contingencies And Litigation [Line Items]
NCR costs and damages percentage	100.00%

Commitments, Contingencies an72

Commitments, Contingencies and Legal Proceedings - Schedule of Reserves (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Environmental Remediation Obligations [Abstract]
Beginning balance	$ 43,144	$ 52,788
Payments	(2,708)	(128)
Assumption of WTM I escrow	4,746
Accretion	66
Ending balance	$ 45,248	$ 52,660

Segment Information - Schedule

Segment Information - Schedule of Financial and Other Information by Business Unit (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)T	Jun. 30, 2017USD ($)T	Jun. 30, 2018USD ($)T	Jun. 30, 2017USD ($)T
Segment Reporting Information [Line Items]
Total revenues	$ 406,717	$ 388,323	$ 818,792	$ 780,165
Costs of products sold	385,114	358,588	748,283	694,801
Gross profit (loss)	21,603	29,735	70,509	85,364
SG&A	31,561	31,545	68,624	66,422
(Gains) losses on dispositions of plant, equipment and timberlands, net	(579)	(58)	(2,133)	(26)
Operating income (loss)	(9,379)	(1,752)	4,018	18,968
Non-operating expense	(6,045)	(4,333)	(10,957)	(7,416)
Income (loss) before income taxes	$ (15,424)	$ (6,085)	$ (6,939)	$ 11,552
Supplementary Data
Net tons sold | T	240,600	251,500	495,400	512,400
Depreciation, depletion and amortization	$ 20,100	$ 17,700	$ 39,511	$ 34,967
Capital expenditures	10,400	34,300	36,900	71,000
Product [Member]
Segment Reporting Information [Line Items]
Total revenues	405,773	387,342	816,420	778,055
Energy and Related Sales Net [Member]
Segment Reporting Information [Line Items]
Total revenues	944	981	2,372	2,110
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Total revenues	142,934	133,137	284,531	258,241
Costs of products sold	118,000	107,600	232,700	207,200
Gross profit (loss)	24,900	25,500	51,800	51,000
SG&A	11,700	10,800	23,300	21,900
Operating income (loss)	13,200	14,700	28,500	29,100
Income (loss) before income taxes	$ 13,200	$ 14,700	$ 28,500	$ 29,100
Supplementary Data
Net tons sold | T	40,400	41,900	80,500	80,700
Depreciation, depletion and amortization	$ 7,200	$ 7,000	$ 14,600	$ 13,800
Capital expenditures	2,800	2,100	7,900	6,800
Composite Fibers [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenues	142,900	133,100	284,500	258,200
Advanced Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Total revenues	72,808	62,836	142,420	122,674
Costs of products sold	62,800	53,000	122,500	103,500
Gross profit (loss)	10,000	9,800	19,900	19,200
SG&A	2,400	2,300	5,100	4,600
Operating income (loss)	7,600	7,500	14,800	14,600
Income (loss) before income taxes	$ 7,600	$ 7,500	$ 14,800	$ 14,600
Supplementary Data
Net tons sold | T	27,000	25,500	53,300	50,300
Depreciation, depletion and amortization	$ 3,500	$ 2,300	$ 6,300	$ 4,600
Capital expenditures	2,500	12,900	15,600	23,500
Advanced Airlaid Materials [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenues	72,800	62,800	142,400	122,700
Specialty Papers [Member]
Segment Reporting Information [Line Items]
Total revenues	190,900	192,400	391,900	399,200
Costs of products sold	200,600	195,600	387,100	375,600
Gross profit (loss)	(9,700)	(3,200)	4,800	23,600
SG&A	11,200	10,300	23,300	$ 23,600
Operating income (loss)	(20,900)	(13,500)	(18,500)
Income (loss) before income taxes	$ (20,900)	$ (13,500)	$ (18,500)
Supplementary Data
Net tons sold | T	173,200	184,100	361,600	381,400
Depreciation, depletion and amortization	$ 8,200	$ 7,700	$ 16,300	$ 14,900
Capital expenditures	4,500	15,800	11,000	34,000
Specialty Papers [Member] | Product [Member]
Segment Reporting Information [Line Items]
Total revenues	190,031	191,368	389,469	397,140
Specialty Papers [Member] | Energy and Related Sales Net [Member]
Segment Reporting Information [Line Items]
Total revenues	900	1,000	2,400	2,100
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Costs of products sold	3,700	2,400	6,000	8,500
Gross profit (loss)	(3,700)	(2,400)	(6,000)	(8,500)
SG&A	6,300	8,100	16,900	16,300
(Gains) losses on dispositions of plant, equipment and timberlands, net	(600)		(2,100)
Operating income (loss)	(9,400)	(10,500)	(20,800)	(24,700)
Non-operating expense	(6,000)	(4,300)	(11,000)	(7,400)
Income (loss) before income taxes	(15,400)	(14,800)	(31,800)	(32,100)
Supplementary Data
Depreciation, depletion and amortization	1,200	700	2,300	1,700
Capital expenditures	$ 600	$ 3,500	$ 2,400	$ 6,700

Condensed Consolidating Finan74

Condensed Consolidating Financial Statements - Additional Information (Detail)	Jun. 30, 2018	Oct. 03, 2012
PHG Tea Leaves, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage owned in domestic subsidiaries	100.00%
Mollanvick, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage owned in domestic subsidiaries	100.00%
Glatfelter Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage owned in domestic subsidiaries	100.00%
Glatfelter Composite Fibers N. A., Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage owned in domestic subsidiaries	100.00%
Glatfelter Advanced Materials N.A., Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage owned in domestic subsidiaries	100.00%
5.375% Notes [Member]
Schedule of Equity Method Investments [Line Items]
Percent on aggregate principal amount of outstanding	5.375%	5.375%

Condensed Consolidating Finan75

Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Income Statements, Captions [Line Items]
Total revenues	$ 406,717	$ 388,323	$ 818,792	$ 780,165
Costs of products sold	385,114	358,588	748,283	694,801
Gross profit (loss)	21,603	29,735	70,509	85,364
Selling, general and administrative expenses	31,561	31,545	68,624	66,422
(Gains) losses on dispositions of plant, equipment and timberlands, net	(579)	(58)	(2,133)	(26)
Operating income (loss)	(9,379)	(1,752)	4,018	18,968
Other non-operating income (expense)
Interest expense	(5,814)	(4,476)	(11,009)	(8,484)
Interest income	26	45	80	158
Other, net	(257)	98	(28)	910
Total non-operating expense	(6,045)	(4,333)	(10,957)	(7,416)
Income (loss) before income taxes	(15,424)	(6,085)	(6,939)	11,552
Income tax provision (benefit)	(8,025)	(371)	(5,256)	5,663
Net income (loss)	(7,399)	(5,714)	(1,683)	5,889
Other comprehensive income (loss)	(25,653)	26,332	(11,633)	33,525
Comprehensive income (loss)	(33,052)	20,618	(13,316)	39,414
Adjustments/ Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	(25,157)	(21,788)	(50,097)	(42,266)
Costs of products sold	(25,157)	(21,788)	(50,097)	(42,266)
Other non-operating income (expense)
Interest expense	1,606	1,349	2,976	2,619
Interest income	(1,606)	(1,349)	(2,976)	(2,619)
Equity in earnings of subsidiaries	(27,678)	(38,050)	(71,166)	(65,519)
Total non-operating expense	(27,678)	(38,050)	(71,166)	(65,519)
Income (loss) before income taxes	(27,678)	(38,050)	(71,166)	(65,519)
Net income (loss)	(27,678)	(38,050)	(71,166)	(65,519)
Other comprehensive income (loss)	56,736	(47,335)	33,665	(57,451)
Comprehensive income (loss)	29,058	(85,385)	(37,501)	(122,970)
Product [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	405,773	387,342	816,420	778,055
Product [Member] | Adjustments/ Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	(25,157)	(21,788)	(50,097)	(42,266)
Energy and Related Sales Net [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	944	981	2,372	2,110
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	190,976	192,351	391,843	399,251
Costs of products sold	203,339	196,145	394,504	381,391
Gross profit (loss)	(12,363)	(3,794)	(2,661)	17,860
Selling, general and administrative expenses	16,971	16,421	37,408	36,583
(Gains) losses on dispositions of plant, equipment and timberlands, net	(22)	16	(460)	48
Operating income (loss)	(29,312)	(20,231)	(39,609)	(18,771)
Other non-operating income (expense)
Interest expense	(6,389)	(5,182)	(12,071)	(9,843)
Interest income	133	142	279	291
Equity in earnings of subsidiaries	14,971	18,801	36,204	32,418
Other, net	1,532	781	(881)	2,365
Total non-operating expense	10,247	14,542	23,531	25,231
Income (loss) before income taxes	(19,065)	(5,689)	(16,078)	6,460
Income tax provision (benefit)	(11,666)	25	(14,395)	571
Net income (loss)	(7,399)	(5,714)	(1,683)	5,889
Other comprehensive income (loss)	(25,653)	26,332	(11,633)	33,525
Comprehensive income (loss)	(33,052)	20,618	(13,316)	39,414
Parent Company [Member] | Product [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	190,032	191,370	389,471	397,141
Parent Company [Member] | Energy and Related Sales Net [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	944	981	2,372	2,110
Guarantors [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	32,319	23,052	52,332	42,585
Costs of products sold	31,097	22,047	49,362	40,633
Gross profit (loss)	1,222	1,005	2,970	1,952
Selling, general and administrative expenses	(332)	236	1,673	310
(Gains) losses on dispositions of plant, equipment and timberlands, net	(565)	(74)	(1,680)	(74)
Operating income (loss)	2,119	843	2,977	1,716
Other non-operating income (expense)
Interest expense	(585)	(206)	(1,040)	(319)
Interest income	1,446	1,237	2,690	2,398
Equity in earnings of subsidiaries	12,707	19,249	34,962	33,101
Other, net	529	(2,319)	(2,734)	(4,525)
Total non-operating expense	14,097	17,961	33,878	30,655
Income (loss) before income taxes	16,216	18,804	36,855	32,371
Income tax provision (benefit)	1,267	3	673	(47)
Net income (loss)	14,949	18,801	36,182	32,418
Other comprehensive income (loss)	(28,587)	23,964	(17,551)	29,066
Comprehensive income (loss)	(13,638)	42,765	18,631	61,484
Guarantors [Member] | Product [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	32,319	23,052	52,332	42,585
Non Guarantors [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	208,579	194,708	424,714	380,595
Costs of products sold	175,835	162,184	354,514	315,043
Gross profit (loss)	32,744	32,524	70,200	65,552
Selling, general and administrative expenses	14,922	14,888	29,543	29,529
(Gains) losses on dispositions of plant, equipment and timberlands, net	8		7
Operating income (loss)	17,814	17,636	40,650	36,023
Other non-operating income (expense)
Interest expense	(446)	(437)	(874)	(941)
Interest income	53	15	87	88
Other, net	(2,318)	1,636	3,587	3,070
Total non-operating expense	(2,711)	1,214	2,800	2,217
Income (loss) before income taxes	15,103	18,850	43,450	38,240
Income tax provision (benefit)	2,374	(399)	8,466	5,139
Net income (loss)	12,729	19,249	34,984	33,101
Other comprehensive income (loss)	(28,149)	23,371	(16,114)	28,385
Comprehensive income (loss)	(15,420)	42,620	18,870	61,486
Non Guarantors [Member] | Product [Member]
Condensed Income Statements, Captions [Line Items]
Total revenues	$ 208,579	$ 194,708	$ 424,714	$ 380,595

Condensed Consolidating Finan76

Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 107,189	$ 116,219
Other current assets	497,136	468,752
Plant, equipment and timberlands, net	844,467	865,743
Other assets	288,305	280,081
Total assets	1,737,097	1,730,795
Liabilities and Shareholders' Equity
Current liabilities	336,875	347,176
Long-term debt	510,177	470,098
Deferred income taxes	76,064	83,571
Other long-term liabilities	127,029	121,022
Total liabilities	1,050,145	1,021,867
Shareholders’ equity	686,952	708,928
Total liabilities and shareholders’ equity	1,737,097	1,730,795
Adjustments/ Eliminations [Member]
Assets
Other current assets	(316,171)	(277,989)
Investments in subsidiaries	(1,490,005)	(1,483,023)
Total assets	(1,806,176)	(1,761,012)
Liabilities and Shareholders' Equity
Current liabilities	(316,171)	(277,989)
Total liabilities	(316,171)	(277,989)
Shareholders’ equity	(1,490,005)	(1,483,023)
Total liabilities and shareholders’ equity	(1,806,176)	(1,761,012)
Parent Company [Member]
Assets
Cash and cash equivalents	1,201	1,292
Other current assets	262,122	249,293
Plant, equipment and timberlands, net	367,703	375,231
Investments in subsidiaries	837,670	829,895
Other assets	144,794	139,552
Total assets	1,613,490	1,595,263
Liabilities and Shareholders' Equity
Current liabilities	422,603	402,787
Long-term debt	394,462	368,496
Deferred income taxes	3,201	14,081
Other long-term liabilities	106,272	100,971
Total liabilities	926,538	886,335
Shareholders’ equity	686,952	708,928
Total liabilities and shareholders’ equity	1,613,490	1,595,263
Guarantors [Member]
Assets
Cash and cash equivalents	1,729	720
Other current assets	256,018	217,822
Plant, equipment and timberlands, net	86,461	80,992
Investments in subsidiaries	652,335	653,128
Total assets	996,543	952,662
Liabilities and Shareholders' Equity
Current liabilities	81,975	54,640
Long-term debt	67,000	51,000
Deferred income taxes	18,542	16,814
Other long-term liabilities	485	313
Total liabilities	168,002	122,767
Shareholders’ equity	828,541	829,895
Total liabilities and shareholders’ equity	996,543	952,662
Non Guarantors [Member]
Assets
Cash and cash equivalents	104,259	114,207
Other current assets	295,167	279,626
Plant, equipment and timberlands, net	390,303	409,520
Other assets	143,511	140,529
Total assets	933,240	943,882
Liabilities and Shareholders' Equity
Current liabilities	148,468	167,738
Long-term debt	48,715	50,602
Deferred income taxes	54,321	52,676
Other long-term liabilities	20,272	19,738
Total liabilities	271,776	290,754
Shareholders’ equity	661,464	653,128
Total liabilities and shareholders’ equity	$ 933,240	$ 943,882

Condensed Consolidating Finan77

Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 38	$ 28,764
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(36,944)	(71,047)
Proceeds from disposals of plant, equipment and timberlands, net	2,384	83
Other	(68)
Net cash used by investing activities	(34,628)	(70,964)
Financing activities
Net borrowings (repayments) of long-term debt	41,013	63,708
Payment of dividends to shareholders	(11,368)	(11,130)
Proceeds from government grants	125
Payments related to share-based compensation awards and other	(980)	(112)
Net cash provided by financing activities	28,790	52,466
Effect of exchange rate on cash	(3,230)	3,732
Net increase (decrease) in cash and cash equivalents	(9,030)	13,998
Cash and cash equivalents at the beginning of period	116,219	55,444
Cash and cash equivalents at the end of period	107,189	69,442
Adjustments/ Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(20,000)	(685)
Investing activities
Repayments from intercompany loans		(12,000)
Advances of intercompany loans	3,445	12,550
Intercompany capital contributed	315	400
Intercompany capital returned	(20,000)
Net cash used by investing activities	(16,240)	950
Financing activities
Repayments of intercompany loans		12,000
Borrowings of intercompany loans	(3,445)	(12,550)
Intercompany capital received	(315)	(400)
Intercompany capital returned	20,000
Payment of intercompany dividend	20,000	685
Net cash provided by financing activities	36,240	(265)
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(4,089)	(12,072)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(13,414)	(40,739)
Proceeds from disposals of plant, equipment and timberlands, net	598	8
Other	(68)
Net cash used by investing activities	(12,884)	(40,731)
Financing activities
Net borrowings (repayments) of long-term debt	25,660	55,000
Payment of dividends to shareholders	(11,368)	(11,130)
Borrowings of intercompany loans	3,445	12,550
Proceeds from government grants	125
Payments related to share-based compensation awards and other	(980)	(112)
Net cash provided by financing activities	16,882	56,308
Net increase (decrease) in cash and cash equivalents	(91)	3,505
Cash and cash equivalents at the beginning of period	1,292	5,082
Cash and cash equivalents at the end of period	1,201	8,587
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(114)	(1,085)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(12,902)	(21,421)
Proceeds from disposals of plant, equipment and timberlands, net	1,785	75
Repayments from intercompany loans		12,000
Advances of intercompany loans	(3,445)	(12,550)
Intercompany capital contributed	(315)	(400)
Intercompany capital returned	20,000
Net cash used by investing activities	5,123	(22,296)
Financing activities
Net borrowings (repayments) of long-term debt	16,000	25,000
Payment of intercompany dividend	(20,000)
Net cash provided by financing activities	(4,000)	25,000
Net increase (decrease) in cash and cash equivalents	1,009	1,619
Cash and cash equivalents at the beginning of period	720	1,461
Cash and cash equivalents at the end of period	1,729	3,080
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	24,241	42,606
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(10,628)	(8,887)
Proceeds from disposals of plant, equipment and timberlands, net	1
Net cash used by investing activities	(10,627)	(8,887)
Financing activities
Net borrowings (repayments) of long-term debt	(647)	(16,292)
Repayments of intercompany loans		(12,000)
Intercompany capital received	315	400
Intercompany capital returned	(20,000)
Payment of intercompany dividend		(685)
Net cash provided by financing activities	(20,332)	(28,577)
Effect of exchange rate on cash	(3,230)	3,732
Net increase (decrease) in cash and cash equivalents	(9,948)	8,874
Cash and cash equivalents at the beginning of period	114,207	48,901
Cash and cash equivalents at the end of period	$ 104,259	$ 57,775