EX-10.21

EXHIBIT 10.21(A)

SCHEDULE OF CHANGE IN CONTROL EMPLOYMENT AGREEMENTS

The Registrant has entered into Change in Control Agreements with the following employees.  

Christopher W. Astley **

Eileen L. Beck **

David C. Elder *

Timothy R. Hess **

Samuel L. Hillard **

John P. Jacunski *

Kent K. Matsumoto **

Dante C. Parrini *

Martin Rapp *

*   In accordance with the Instructions to Item 601 of Regulation S-K, the Registrant has omitted filing copies of the agreements because they are substantially identical to the Form of Change in Control Employment Agreement by and between P. H. Glatfelter Company and certain employees, which is filed as Exhibit 10(J) to the Form 10-K for the year ended December 31, 2008.

** In accordance with the Instructions to Item 601 of Regulation S-K, the Registrant has omitted filing copies of the agreements because they are substantially identical to the Form of Change in Control Employment Agreement by and between P. H. Glatfelter Company and certain employees, which is filed as Exhibit 10(Q) to the Form 10-K for the year ended December 31, 2013.

EX-21

EXHIBIT 21

Name	Jurisdiction
Glatfelter Advanced Materials N.A., Inc.	U.S. (Delaware)
Glatfelter Caerphilly, Ltd.	United Kingdom
Glatfelter Composite Fibers NA, Inc.	U.S. (Delaware)
Glatfelter Dresden GmbH	Germany
Glatfelter Falkenhagen GmbH	Germany
Glatfelter Gatineau Ltèe	Canada
Glatfelter Gernsbach GmbH	Germany
Glatfelter Holdings, LLC	U.S. (Delaware)
Glatfelter Hong Kong Limited	Hong Kong
Glatfelter Ireland Limited	Ireland
Glatfelter Luxembourg S.à.r.l.	Luxembourg
Glatfelter Luxembourg Services S.à.r.l.	Luxembourg
Glatfelter Lydney, Ltd.	United Kingdom
Glatfelter Ober-Schmitten GmbH	Germany
Glatfelter Russia LLC	Russia
Glatfelter Scaër SAS	France
Glatfelter Trade (Suzhou) Co., Ltd.	China
Mollanvick, Inc.	U.S. (Delaware)
Newtech Pulp, Inc.	Philippines
P. H. Glatfelter Company (parent)	U.S. (Pennsylvania)
PHG Tea Leaves, Inc.	U.S. (Delaware)

EX-23

EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 33-49660, 33-62331, 333-12089, 333-26587, 333-160310, 333-188910 and 333-217883 on Form S-8 of our reports dated February 23, 2018, relating to the consolidated financial statements and financial statement schedule of P. H. Glatfelter Company and subsidiaries, and the effectiveness of P. H. Glatfelter Company and subsidiaries' internal control over financial reporting, appearing in this Annual Report on Form 10-K of P. H. Glatfelter Company and subsidiaries for the year ended December 31, 2017.

/s/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania

February 23, 2018

EX-31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT TO SECTION 302 (a) OF THE SARBANES-OXLEY ACT OF 2002

I, Dante C. Parrini, certify that:

1. I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2017 of P. H. Glatfelter Company (“Glatfelter”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report.

4. Glatfelter’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Glatfelter and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to Glatfelter, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of Glatfelter's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in Glatfelter's internal control over financial reporting that occurred during Glatfelter’s most recent fiscal quarter (the fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, Glatfelter's internal control over financial reporting; and

5. Glatfelter’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Glatfelter’s auditors and the audit committee of Glatfelter’s board of directors or persons performing the equivalent functions:

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Glatfelter’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in Glatfelter’s internal control over financial reporting.

Date: February 23, 2018	By:	/s/ Dante C. Parrini
		Dante C. Parrini
		Chairman and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO SECTION 302 (a) OF THE SARBANES-OXLEY ACT OF 2002

I, John P. Jacunski, certify that:

1. I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2017 of P. H. Glatfelter Company (“Glatfelter”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. Glatfelter’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Glatfelter and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to Glatfelter, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of Glatfelter's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in Glatfelter's internal control over financial reporting that occurred during Glatfelter’s most recent fiscal quarter (the fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, Glatfelter's internal control over financial reporting; and

5. Glatfelter’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Glatfelter’s auditors and the audit committee of Glatfelter’s board of directors or persons performing the equivalent functions:

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Glatfelter’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in Glatfelter’s internal control over financial reporting.

Date: February 23, 2018	By:	/s/ John P. Jacunski
		John P. Jacunski
		Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 18 U.S.C. SECTION 1350

In connection with the Annual Report on Form 10-K for the year ended December 31, 2017 of P. H. Glatfelter Company (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dante C. Parrini, Chairman and Chief Executive Officer of the Company, certify to the best of my knowledge, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to Glatfelter and will be retained by Glatfelter and furnished to the Securities and Exchange Commission or its staff upon request.

 Date: February 23, 2018By:  /s/ Dante C. Parrini

Dante C. Parrini

Chairman and Chief Executive Officer 

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 18 U.S.C. SECTION 1350

In connection with the Annual Report on Form 10-K for the year ended December 31, 2017 of P. H. Glatfelter Company (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John P. Jacunski, Executive Vice President and Chief Financial Officer of the Company, certify to the best of my knowledge, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to Glatfelter and will be retained by Glatfelter and furnished to the Securities and Exchange Commission or its staff upon request.

 Date: February 23, 2018By:  /s/ John P. Jacunski

John P. Jacunski

Executive Vice President and Chief Financial Officer 

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	GLT
Entity Registrant Name	GLATFELTER P H CO
Entity Central Index Key	0000041719
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,688,575
Entity Public Float			$ 833.7

XML

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Energy and related sales, net									5,126	6,141	5,664
Total revenues									1,596,423	1,610,938	1,666,748
Costs of products sold									1,403,913	1,392,335	1,463,783
Gross profit	$ 50,410	$ 54,735	$ 30,436	$ 56,929	$ 56,867	$ 61,170	$ 42,723	$ 57,843	192,510	218,603	202,965
Selling, general and administrative expenses									134,394	190,694	127,706
Losses (gains) on dispositions of plant, equipment and timberlands, net									26	216	(21,113)
Operating income									58,090	27,693	96,372
Non-operating income (expense)
Interest expense									(17,772)	(15,822)	(17,464)
Interest income									237	206	283
Other, net									(1,220)	(1,271)	(615)
Total non-operating expense									(18,755)	(16,887)	(17,796)
Income before income taxes									39,335	10,806	78,576
Income tax provision (benefit)									31,421	(10,748)	14,001
Net income									$ 7,914	$ 21,554	$ 64,575
Earnings per share
Basic									$ 0.18	$ 0.49	$ 1.49
Diluted									0.18	0.49	1.47
Cash dividends declared per common share									$ 0.52	$ 0.50	$ 0.48
Weighted average shares outstanding
Basic									43,609	43,558	43,397
Diluted									44,439	44,129	43,942

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 7,914	$ 21,554	$ 64,575
Foreign currency translation adjustments	58,609	(27,407)	(38,817)
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $1,930, $(335) and $880, respectively	(5,592)	1,725	(2,581)
Unrecognized retirement obligations, net of taxes of $(6,293), $(7,247) and $(2,920), respectively	10,914	11,562	5,782
Other comprehensive income (loss)	63,931	(14,120)	(35,616)
Comprehensive income	$ 71,845	$ 7,434	$ 28,959

XML

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Taxes on deferred gains (losses) on cash flow hedges	$ 1,930	$ (335)	$ 880
Taxes on unrecognized retirement obligations	$ (6,293)	$ (7,247)	$ (2,920)

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 116,219	$ 55,444
Accounts receivable, net	174,154	152,989
Inventories	252,064	249,669
Prepaid expenses and other current assets	42,534	36,157
Total current assets	584,971	494,259
Plant, equipment and timberlands, net	865,743	775,898
Goodwill	82,744	73,094
Intangible assets, net	58,859	56,259
Other assets	138,478	121,749
Total assets	1,730,795	1,521,259
Liabilities and Shareholders' Equity
Current portion of long-term debt	11,298	8,961
Accounts payable	190,478	164,345
Dividends payable	5,678	5,455
Environmental liabilities	28,500	25,000
Other current liabilities	111,222	119,250
Total current liabilities	347,176	323,011
Long-term debt	470,098	363,647
Deferred income taxes	83,571	54,995
Other long-term liabilities	121,022	125,780
Total liabilities	1,021,867	867,433
Commitments and contingencies
Shareholders’ equity
Common stock	544	544
Capital in excess of par value	62,594	57,917
Retained earnings	948,411	962,884
Accumulated other comprehensive loss	(140,675)	(204,606)
Shareholders' equity before treasury stock	870,874	816,739
Less cost of common stock in treasury	(161,946)	(162,913)
Total shareholders’ equity	708,928	653,826
Total liabilities and shareholders’ equity	$ 1,730,795	$ 1,521,259

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,957	$ 1,719
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	54,361,980	54,361,980
Treasury stock, shares	10,748,127	10,812,341

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income	$ 7,914	$ 21,554	$ 64,575
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	76,048	65,826	63,236
Amortization of debt issue costs and original issue discount	1,157	1,153	1,184
Pension expense, net of unfunded benefits paid	4,933	11,180	7,383
Charge for impairment of intangible asset			1,200
Deferred income tax provision (benefit)	19,026	(22,055)	(1,902)
(Gains) losses on dispositions of plant, equipment and timberlands, net	26	216	(21,113)
Share-based compensation	6,214	5,889	7,244
Change in operating assets and liabilities
Accounts receivable	(10,189)	8,372	(13,312)
Inventories	9,198	(10,778)	(8,054)
Prepaid and other current assets	(6,300)	(2,430)	5,506
Accounts payable	13,065	(8,174)	26,042
Accruals and other current liabilities	(17,615)	43,195	(2,186)
Other	785	2,162	3,940
Net cash provided by operating activities	104,262	116,110	133,743
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(132,304)	(160,158)	(99,889)
Proceeds from disposals of plant, equipment and timberlands, net	228	70	24,459
Acquisition, net of cash acquired			(224)
Other investing	(243)	(800)	(1,600)
Net cash used by investing activities	(132,319)	(160,888)	(77,254)
Financing activities
Net borrowings (repayments) under revolving credit facility	109,436	2,891	(22,294)
Payments of borrowing costs		(136)	(1,329)
Proceeds from term loans		19,428	2,873
Repayment of term loans	(9,771)	(8,205)	(5,229)
Payments of dividends	(22,480)	(21,589)	(20,443)
Proceeds from government grants	4,875	5,582	421
Payments related to share-based compensation awards and other	(472)	(990)	(2,015)
Net cash provided (used) by financing activities	81,588	(3,019)	(48,016)
Effect of exchange rate changes on cash	7,244	(2,063)	(3,006)
Net increase (decrease) in cash and cash equivalents	60,775	(49,860)	5,467
Cash and cash equivalents at the beginning of period	55,444	105,304	99,837
Cash and cash equivalents at the end of period	116,219	55,444	105,304
Cash paid for:
Interest, net of amounts capitalized	16,476	14,569	16,256
Income taxes, net	$ 9,336	$ 14,020	$ 15,849

XML

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2014	$ 649,109	$ 544	$ 54,342	$ 919,468	$ (154,870)	$ (170,375)
Net income	64,575			64,575
Other comprehensive income (loss)	(35,616)				(35,616)
Comprehensive income	28,959
Tax effect on exercise of stock awards	843		843
Cash dividends declared	(20,900)			(20,900)
Share-based compensation expense	4,403		4,403
Delivery of treasury shares
RSUs and PSAs	(1,976)		(5,078)			3,102
401 (k) plans	2,848		838			2,010
Employee stock options exercised — net	(39)		(436)			397
Ending Balance at Dec. 31, 2015	663,247	544	54,912	963,143	(190,486)	(164,866)
Net income	21,554			21,554
Other comprehensive income (loss)	(14,120)				(14,120)
Comprehensive income	7,434
Tax effect on exercise of stock awards	58		58
Cash dividends declared	(21,813)			(21,813)
Share-based compensation expense	5,889		5,889
Delivery of treasury shares
RSUs and PSAs	(751)		(2,375)			1,624
Employee stock options exercised — net	(238)		(567)			329
Ending Balance at Dec. 31, 2016	653,826	544	57,917	962,884	(204,606)	(162,913)
Previously unrecognized excess tax benefit onexercise of stock awards	317			317
Net income	7,914			7,914
Other comprehensive income (loss)	63,931				63,931
Comprehensive income	71,845
Cash dividends declared	(22,704)			(22,704)
Share-based compensation expense	6,214		6,214
Delivery of treasury shares
RSUs and PSAs	(114)		(535)			421
Employee stock options exercised — net	(456)		(1,002)			546
Ending Balance at Dec. 31, 2017	$ 708,928	$ 544	$ 62,594	$ 948,411	$ (140,675)	$ (161,946)

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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Per share amount of cash dividends declared	$ 0.52	$ 0.50	$ 0.48
Retained Earnings [Member]
Per share amount of cash dividends declared	$ 0.52	$ 0.50	$ 0.48

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Organization

12 Months Ended

Dec. 31, 2017

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 engineered materials. Headquartered in York, PA, U.S. operations include facilities in Fort Smith, Arkansas, Spring Grove, PA and Chillicothe and Fremont, OH. International operations include facilities in Canada, Germany, France, the United Kingdom and the Philippines. In addition to many of our manufacturing locations, we have sales and distribution offices in the U.S., Russia and China. Our products are marketed worldwide, either through wholesale paper merchants, brokers and agents, or directly to customers.

XML

Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Accounting Policies

2. ACCOUNTING POLICIES

Principles of Consolidation    The consolidated financial statements include the accounts of Glatfelter and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.

Accounting Estimates    The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies as of the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes that actual results may differ from those estimates and assumptions.

Cash and Cash Equivalents    We classify all highly liquid instruments with an original maturity of three months or less at the time of purchase as cash equivalents.

Inventories    Inventories are stated at the lower of cost or market. Raw materials, in-process and finished inventories of our U.S. manufacturing operations are valued using the last-in, first-out (LIFO) method, and the supplies inventories are valued principally using the average-cost method. Inventories at our foreign operations are valued using the average cost method.

Plant, Equipment and Timberlands    For financial reporting purposes, depreciation is computed using the straight-line method over the estimated useful lives of the respective assets.

The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows:

Buildings	15 – 45 Years
Machinery and equipment	5 – 40 Years
Other	3 – 25 Years

Maintenance and Repairs    Maintenance and repairs costs are charged to income and major renewals and betterments are capitalized. At the time property is retired or sold, the net carrying value is eliminated and any resultant gain or loss is included in income.

Valuation of Long-lived Assets, Intangible Assets and Goodwill    We evaluate long-lived assets for impairment when a specific event indicates that the carrying value of an asset may not be recoverable. Recoverability is assessed based on estimates of future cash flows expected to result from the use and eventual disposition of the asset. If the sum of expected undiscounted cash flows is less than the carrying value of the asset, the asset’s fair value is estimated and an impairment loss is recognized for the amount by which the carrying value exceeds the estimated fair value.

Goodwill and non-amortizing tradename intangible assets are reviewed, on a discounted cash flow basis, during the third quarter of each year for impairment or more frequently if impairment indicators are present. For Goodwill, impairment losses, if any, are recognized for the amount by which the carrying value of the reporting unit exceeds its fair value. The carrying value of a reporting unit is defined using an enterprise premise which is generally determined by the difference between the unit’s assets and operating liabilities.  With respect to tradename, impairment losses, if any, are recognized for the amount by which the carrying value of the tradename exceeds its fair value.

Income Taxes    Income taxes are determined using the asset and liability method of accounting for income taxes in accordance with FASB ASC 740 Income Taxes (“ASC 740”). Under ASC 740, tax expense includes U.S. and international income taxes plus the provision for U.S. taxes on undistributed earnings of international subsidiaries not deemed to be permanently invested. Tax credits and other incentives reduce tax expense in the year the credits are claimed. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported in deferred income taxes. Deferred tax assets are recognized if it is more likely than not that the assets will be realized in future years. We establish a valuation allowance for deferred tax assets for which realization is not more likely than not.

Significant judgment is required in determining our worldwide provision for income taxes and recording the related assets and liabilities. In the ordinary course of our business, there are many transactions and calculations where the ultimate tax determination is less than certain. We and our subsidiaries are examined by various Federal, State, and foreign tax authorities. We regularly assess the potential outcomes of these examinations and any future examinations for the current or prior years in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and record any necessary adjustments in the period in which the facts that give rise to a revision become known.

Investment tax credits are accounted for by the flow-through method, which results in recognition of the benefit in the year in which the credit become available.

Treasury Stock    Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the weighted-average cost basis.

Foreign Currency Translation    Foreign currency translation gains and losses and the effect of exchange rate changes on transactions designated as hedges of net foreign investments are included as a component of other comprehensive income (loss). Transaction gains and losses are included in income in the period in which they occur.

Revenue Recognition    We recognize revenue on product sales when the customer takes title and assumes the risks and rewards of ownership. Substantially all of our revenue is earned pursuant to contracts under which we have one performance obligation that is satisfied at a point-in-time. Estimated costs for sales incentives, discounts and sales returns and allowances are recorded as sales deductions in the period in which the related revenue is recognized.

Revenue from energy sales is recognized when electricity is delivered to the customer. Certain costs associated with the production of electricity, such as fuel, labor, depreciation and maintenance are netted against energy sales for presentation on the consolidated statements of income.

Revenue from renewable energy credits is recorded under the caption “Energy and related sales, net” in the consolidated statements of income and is recognized when all risks, rights and rewards to the certificate are transferred to the counterparty.

Environmental Liabilities    Accruals for losses associated with environmental obligations are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated based on existing legislation and remediation technologies. These accruals are adjusted periodically as assessment and remediation actions continue and/or further legal or technical information develops. Such undiscounted liabilities are exclusive of any insurance or other claims against third parties. Environmental costs are capitalized if the costs extend the life of the asset, increase its capacity and/or mitigate or prevent contamination from future operations. Recoveries of environmental remediation costs from other parties, including insurance carriers, are recorded as assets when their receipt is assured beyond a reasonable doubt.

Earnings Per Share    Basic earnings per share is computed by dividing net income by the weighted-average common shares outstanding during the respective periods. Diluted earnings per share is computed by dividing net income by the weighted-average common shares and common share equivalents outstanding during the period. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method.

Financial Derivatives and Hedging Activities    We use financial derivatives to manage exposure to changes in foreign currencies. In accordance with FASB ASC 815 Derivatives and Hedging (“ASC 815”), we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.

The effective portion of the gain or loss on those derivative instruments designated and qualifying as a hedge of the exposure to variability in expected future cash flows related to forecasted transactions is deferred and reported as a component of accumulated other comprehensive income (loss). Deferred gains or losses are reclassified to our results of operations at the time the hedged forecasted transaction is recorded in our results of operations. The effectiveness of cash flow hedges is assessed at inception and quarterly thereafter. If the instrument becomes ineffective or it becomes probable that the originally forecasted transaction will not occur, the related change in fair value of the derivative instrument is also reclassified from accumulated other comprehensive income (loss) and recognized in earnings.

Fair Value of Financial Instruments    Under the accounting for fair value measurements and disclosures, a fair value hierarchy was established that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are described below:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

Recently Issued Accounting Pronouncements  In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-09, Compensation – Stock Compensation (Topic 718) Improvements to Employee Share-Based Payment Accounting designed to simplify certain aspects of accounting for share-based awards. The new ASU requires entities to recognize as a component of income tax expense all excess tax benefits or deficiencies arising from the difference between compensation costs recognized and the intrinsic value at the time an option is exercised or, in the case of restricted stock and similar awards, the fair value upon vesting of an award. Previously such differences were recognized in additional paid in capital as part of an “APIC pool.” The ASU also requires entities to exclude excess tax benefits and tax deficiencies from the calculation of common share equivalents for purposes of calculating earnings per share. In addition, as permitted by the ASU, we have elected to account for the impact of forfeitures as they occur rather to estimate forfeitures for purposes of recognizing compensation expense. We adopted this standard effective January 1, 2017, on a prospective basis; however, the adoption of the new standard did not have a material impact on our reported results of operations or financial position.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers which clarifies the principles for recognizing revenue and develops a common revenue standard for GAAP and International Financial Reporting Standards. The new standard is required to be adopted retrospectively for fiscal years beginning after December 15, 2017. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. Substantially all of our revenue is earned pursuant to contracts under which we have one performance obligation that is satisfied at a point-in-time. We have completed our review of our contracts and have determined this ASU will not have an impact on the timing or amount of revenue recognition, our results of operations or our financial position. We have elected to use the modified retrospective method of adoption.

In March 2017, the FASB issued ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). The update requires entities to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. All other components are to be presented below the determination of operating income. Entities will be required to disclose the line(s) used to present the other components of net periodic benefit cost, if the components are not presented separately in the income statement. ASU 2017-07 is effective for fiscal years and interim periods beginning after December 15, 2017, and early adoption is permitted. We will adopt this standard beginning with first quarter 2018 financial statements and all previously presented consolidated statements of income will be represented to reflect the reclassification and will result in a reduction of operating income of $2.7 million in 2017 and an increase of $3.4 million for 2016. Such amounts will be reclassified to “Non-operating income (expense).”

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This ASU will require organizations such as us that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance will be effective for annual periods beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We are in the process of assessing the impact this standard will have on us and expect to follow a modified retrospective method provided for under the standard.

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities" (“ASU 2017-12”), which simplifies the application of hedge accounting and more closely aligns hedge accounting with an entity’s risk management strategies. ASU 2017-12 also amends the manner in which hedge effectiveness may be performed and changes the presentation of hedge ineffectiveness in the financial statements. ASU 2017-12 is effective for us beginning January 1, 2019, with early adoption permitted. ASU 2017-12 requires a cumulative-effect adjustment for certain items upon adoption. We are currently evaluating the impact the adoption of ASU 2017-12 will have on our consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments that changes the impairment model for most financial instruments, including trade receivables from an incurred loss method to a new forward-looking approach, based on expected losses. Under the new guidance, an allowance is recognized based on an estimate of expected credit losses. This standard is effective for us in the first quarter of 2020 and must be adopted using a modified retrospective transition approach. We are currently assessing the impact this standard may have on our results of operations and financial position.

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Energy and Related Sales, Net

12 Months Ended

Dec. 31, 2017

Text Block [Abstract]

Energy and Related Sales, Net

3. ENERGY AND RELATED SALES, NET

We sell excess power generated by the Spring Grove, PA facility. We also sell renewable energy credits generated by the Spring Grove, PA and Chillicothe, OH facilities representing sales of certified credits earned related to burning renewable sources of energy such as black liquor and wood waste.

The following table summarizes this activity for each of the past three years:

	Year ended December 31
In thousands	2017			2016			2015
Energy sales	$	3,258		$	3,613		$	5,315
Costs to produce		(3,986	)		(3,972	)		(4,428	)
Net		(728	)		(359	)		887
Renewable energy credits		5,854			6,500			4,777
Total	$	5,126		$	6,141		$	5,664

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Gain on Dispositions of Plant, Equipment and Timberlands

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Gain on Dispositions of Plant, Equipment and Timberlands

4. GAIN ON DISPOSITIONS OF PLANT, EQUIPMENT AND TIMBERLANDS

During 2017, 2016 and 2015, we completed the following sales of assets:

Dollars in thousands	Acres		Proceeds		Gain (loss)
2017
Timberlands		332	$	209	$	188
Other	n/a			19		(214	)
Total			$	228	$	(26	)
2016
Timberlands		—	$	-	$	-
Other	n/a			70		(216	)
Total			$	70	$	(216	)
2015
Timberlands		15,628	$	23,917	$	20,867
Other	n/a		542		246
Total			$	24,459	$	21,113

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Asset Impairment Charges

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Asset Impairment Charges

5. ASSET IMPAIRMENT CHARGES

In connection with our annual test of potential impairment of indefinite lived intangible assets, in 2015 we recorded a non-cash impairment charge of $1.2 million. No such charges were recorded in 2017 or 2016. A trade name intangible asset was acquired in connection with our Composite Fibers business unit’s 2013 Dresden acquisition. The charge was due to changes in the estimated fair value of the trade name, primarily driven by lower forecasted revenues associated with the business, an increase in discount rates related to Dresden’s business in Russia and Ukraine and this region’s political and economic instability. The fair value of the asset was estimated using a discounted cash flow model under a relief from royalty method. The significant assumptions used included projected financial performance and discount rates, which resulted in a Level 3 fair value classification.

The charge is recorded in the accompanying consolidated statements of income under the caption “Selling, general and administrative expenses.” For additional information on Goodwill and Intangible Assets, see Note 13.

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Earnings Per Share

12 Months Ended

Dec. 31, 2017

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):

	Year ended December 31
In thousands, except per share		2017	2016		2015
Net income	$	7,914	$	21,554	$	64,575
Weighted average common shares    outstanding used in basic EPS		43,609		43,558		43,397
Common shares issuable upon    exercise of dilutive stock options    and PSAs / RSUs		830		571		545
Weighted average common shares    outstanding and common share    equivalents used in diluted EPS		44,439		44,129		43,942
Earnings per share
Basic	$	0.18	$	0.49	$	1.49
Diluted		0.18		0.49		1.47

The following table sets forth the potential common shares outstanding for stock options that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive:

	Year ended December 31
In thousands	2017		2016		2015
Potential common shares		610		596		678

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Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2017

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 years ended December 31, 2017, 2016 and 2015.

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, 2017	$	(100,448	)	$	1,500		$	(110,656	)	$	4,998		$	(204,606	)
Other comprehensive income    before reclassifications  (net of tax)		58,609			(5,182	)		2,981			(1,099	)		55,309
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			(410	)		9,380			(348	)		8,622
Net current period other comprehensive    income (loss)		58,609			(5,592	)		12,361			(1,447	)		63,931
Balance at December 31, 2017	$	(41,839	)	$	(4,092	)	$	(98,295	)	$	3,551		$	(140,675	)
Balance at January 1, 2016	$	(73,041	)	$	(225	)	$	(120,714	)	$	3,494		$	(190,486	)
Other comprehensive income    before reclassifications  (net of tax)		(27,407	)		1,247			(4,334	)		2,086			(28,408	)
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			478			14,392			(582	)		14,288
Net current period other comprehensive    income (loss)		(27,407	)		1,725			10,058			1,504			(14,120	)
Balance at December 31, 2016	$	(100,448	)	$	1,500		$	(110,656	)	$	4,998		$	(204,606	)
Balance at January 1, 2015	$	(34,224	)	$	2,356		$	(120,260	)	$	(2,742	)	$	(154,870	)
Other comprehensive income    before reclassifications  (net of tax)		(38,817	)		1,620			(12,995	)		6,266			(43,926	)
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			(4,201	)		12,541			(30	)		8,310
Net current period other comprehensive    income (loss)		(38,817	)		(2,581	)		(454	)		6,236			(35,616	)
Balance at December 31, 2015	$	(73,041	)	$	(225	)	$	(120,714	)	$	3,494		$	(190,486	)

The following table sets forth the amounts reclassified from accumulated other comprehensive income (losses) for the years indicated.

	Year ended December 31
In thousands	2017			2016			2015
Description										Line Item in Statements of Income
Cash flow hedges (Note 18)
(Gains) losses on cash flow hedges	$	(532	)	$	551		$	(5,752	)	Costs of products sold
Tax expense (benefit)		122			(73	)		1,551		Income tax provision (benefit)
Net of tax		(410	)		478			(4,201	)
Retirement plan obligations (Note 10)
Amortization of deferred benefit pension plan items
Prior service costs		2,122			2,026			2,300		Costs of products sold
		704			672			762		Selling, general and administrative
Actuarial losses		9,134			9,798			12,745		Costs of products sold
		3,145			3,373			4,388		Selling, general and administrative
Settlement recognition		—			7,306			—		Selling, general and administrative
		15,105			23,175			20,195
Tax expense (benefit)		(5,725	)		(8,783	)		(7,654	)	Income tax provision (benefit)
Net of tax		9,380			14,392			12,541
Amortization of deferred benefit other plan items
Prior service costs		(150	)		(150	)		(230	)	Costs of products sold
		(32	)		(32	)		(50	)	Selling, general and administrative
Actuarial losses		(311	)		(621	)		190		Costs of products sold
		(67	)		(134	)		41		Selling, general and administrative
		(560	)		(937	)		(49	)
Tax expense (benefit)		212			355			19		Income tax provision (benefit)
Net of tax		(348	)		(582	)		(30	)
Total reclassifications, net of tax	$	8,622		$	14,288		$	8,310

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Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

8. INCOME TAXES

Effects of the Tax Cuts and Jobs Act

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.

SAB 118 summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the Tax Cuts and Jobs Act.

Amounts recorded where we consider accounting to be complete for the year ended December 31, 2017, principally relate to the reduction in the U.S. corporate income tax rate to 21%, which resulted in us recording an income tax benefit of $18.1 million to remeasure net deferred taxes liabilities.

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 a preliminary earnings and profits analysis which resulted in us recording provisional U.S. federal income tax expense of $41.8 million, $3.8 million of non-US taxes and $0.3 million of state taxes associated with the repatriation of such earnings and profits. Although we have made a reasonable estimate of the tax associated with our net accumulated earnings, a final determination of the TCJA’s impact remains incomplete pending a full analysis of the provisions and their interpretations.

Other significant provisions that are not yet effective but may impact income taxes in future years include: an exemption from U.S. tax on dividends of future earnings, limitation on the current deductibility of net interest expense in excess of 30% of adjusted taxable income, a limitation of the use of net operating losses generated after fiscal 2018 to 80% of taxable income but with an indefinite carryforward period, an incremental tax (base erosion anti-abuse tax or “BEAT”) on excessive amounts paid to foreign related parties, and a minimum tax on certain foreign earnings in excess of 10% of the foreign subsidiaries’ tangible assets (i.e., global intangible low-taxed income or “GILTI”). We are still evaluating whether to make a policy election to treat the GILTI tax as a period expense or to provide U.S. deferred taxes on foreign temporary differences that are expected to generate GILTI when they reverse in future years.

Income taxes are recognized for the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The effects of income taxes are measured based on enacted tax laws and rates.

The provision for (benefit from) income taxes from operations consisted of the following:

	Year ended December 31
In thousands	2017			2016			2015
Current taxes
Federal	$	(1,961	)	$	2,216		$	5,047
State		64			(1,112	)		(1,680	)
Foreign		14,292			10,203			12,536
		12,395			11,307			15,903
Deferred taxes and    other
Federal		11,662			(24,411	)		(7,287	)
State		3,388			(1,723	)		564
Foreign		3,976			4,079			4,821
		19,026			(22,055	)		(1,902	)
Income tax provision    (benefit)	$	31,421		$	(10,748	)	$	14,001

The following are the domestic and foreign components of pretax income (loss) from operations:

	Year ended December 31
In thousands	2017			2016			2015
United States	$	(40,920	)	$	(63,315	)	$	2,382
Foreign		80,255			74,121			76,194
Total pretax income	$	39,335		$	10,806		$	78,576

A reconciliation between the income tax provision, computed by applying the statutory federal income tax rate of 35% to income before income taxes, and the actual income tax provision is as follows:

	Year ended December 31
	2017			2016			2015
Federal income tax    provision at statutory rate		35.0	%		35.0	%		35.0	%
State income taxes,    net of federal income tax    benefit		0.4			(15.0	)		0.3
Foreign income tax rate    differential		(28.7	)		(96.3	)		(8.6	)
Rate changes due to    enacted legislation		(0.6	)		(6.7	)		—
Tax effect of credits		(16.1	)		(30.3	)		(1.9	)
Provision for (resolution of ) tax matters		16.9			2.8			(2.1	)
State benefit due to enacted legislation		(4.1	)		—			—
Effect of U.S. tax law change (1)		53.2			—			—
Valuation allowance		23.3			7.1			0.4
Permanent differences on    non-U.S. earnings		—			—			(4.4	)
Other		0.6			3.9			(0.9	)
Actual tax rate		79.9	%		(99.5	)%		17.8	%

(1) Due to the TCJA which was enacted in December 2017, provisional mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. Our U.S. deferred tax assets and liabilities as of December 31, 2017 were re-measured from 35% to 21%.

The provisional effects of the TCJA are $39.0 million of deferred income tax expense, including a $6.8 million reversal of a valuation allowance, and $18.1 million of deferred income tax benefit for the year ended December 31, 2017.

The sources of deferred income taxes were as follows at December 31:

In thousands	2017			2016
Reserves	$	3,145		$	4,625
Environmental		11,189			20,868
Compensation		6,782			8,950
Post-retirement benefits		12,570			18,318
Research & development expenses		6,787			6,949
Inventories		1,891			1,464
Tax carryforwards		21,988			14,438
Other		2,106			993
Deferred tax assets		66,458			76,605
Valuation allowance		(7,405	)		(4,066	)
Net deferred tax assets		59,053			72,539
Property		(98,809	)		(81,837	)
Intangible assets		(17,647	)		(16,561	)
Pension		(21,941	)		(29,041	)
Other		(4,110	)		—
Deferred tax liabilities		(142,507	)		(127,439	)
Net deferred tax liabilities	$	(83,454	)	$	(54,900	)

Non-current deferred tax assets and liabilities are included in the following balance sheet captions:

	December 31
In thousands	2017		2016
Other assets	$	117	$	95
Deferred income taxes		83,571		54,995

At December 31, 2017 we had federal, state and foreign tax net operating loss (“NOL”) carryforwards of $47.9 million, $188.4 million and $3.7 million, respectively. These NOL carryforwards are available to offset future taxable income, if any. The federal NOL carryforward expires in 2037, state NOLs expire at various times and in various amounts beginning in 2018 and through 2037. Certain foreign NOL carryforwards begin to expire after 2023.

The state and foreign NOL carryforwards and federal tax credits on the income tax returns filed included unrecognized tax benefits taken in prior years. The NOLs for which a deferred tax asset is recognized for financial statement purposes in accordance with ASC 740 are presented net of these unrecognized tax benefits.

In addition, we had various federal tax credit carryforwards totaling $9.1 million which begin to expire after 2035, state tax credit carryforwards totaling $0.2 million, which begin to expire in 2018, and foreign investment tax credits of $2.4 million which begin to expire after 2027.

As of December 31, 2017 and 2016, we had a valuation allowance of $7.4 million and $4.1 million, respectively, against net deferred tax assets, primarily due to uncertainty regarding the ability to utilize state and foreign tax NOL carryforwards and certain state tax credits. In assessing the need for a valuation allowance, management considers all available positive and negative evidence in its analysis. Based on this analysis, we recorded a valuation allowance for the portion of deferred tax assets where the weight of available evidence indicated it is more likely than not that the deferred tax assets will not be realized.

Tax credits and other incentives reduce tax expense in the year the credits are claimed. We recorded tax credits of $6.3 million, $1.1 million and $1.5 million in 2017, 2016 and 2015, respectively, related to research and development credits and fuels tax credits.

As a result of the mandatory deemed repatriation provisions in the TCJA, we recorded a provisional estimate on $397.8 million of undistributed earnings of foreign subsidiaries in U.S. taxable income at the reduced tax rates. With respect to other basis differences in connection with our foreign subsidiaries at December 31, 2017, we assert that such basis differences are indefinite in duration, and as a result, no deferred taxes have been provided.

As of December 31, 2017, 2016 and 2015, we had $26.9 million, $14.2 million and $12.2 million of gross unrecognized tax benefits, respectively. As of December 31, 2017, if such benefits were to be recognized, approximately $16.8 million would be recorded as a component of income tax expense, thereby affecting our effective tax rate.

A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows:

In millions	2017			2016			2015
Balance at January 1	$	14.2		$	12.2		$	14.9
Increases in tax positions    for prior years		1.7			2.0			0.0
Decreases in tax positions    for prior years		—			(1.4	)		(4.3	)
Increases in tax positions    for current year		11.9			1.9			1.9
Settlements		—			(0.2	)		0.0
Lapse in statutes of    limitation		(0.9	)		(0.3	)		(0.3	)
Balance at December 31	$	26.9		$	14.2		$	12.2

We, or one of our subsidiaries, file income tax returns with the United States Internal Revenue Service, as well as various state and foreign authorities. The following table summarizes tax years that remain subject to examination by major jurisdiction:

	Open Tax Years
Jurisdiction	Examinations not yet initiated	Examination in progress
United States
Federal	2014 - 2017	N/A
State	2013 - 2017	2014
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 expiration 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 $0.6 million. The majority of this range relates to tax positions taken in 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:

	As of or for the year ended December 31,
In millions	2017		2016			2015
Accrued interest payable	$	0.8	$	0.5		$	0.6
Interest expense (income)		0.3		(0.1	)	–
Penalties	–		–			–

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

9. STOCK-BASED COMPENSATION

The P. H. Glatfelter Amended and Restated Long Term Incentive Plan (the “LTIP”) provides for the issuance of Glatfelter common stock to eligible participants in the form of restricted stock units, restricted stock awards, non-qualified stock options, performance shares, incentive stock options and performance units. As of December 31, 2017, there were 2,188,572 shares of common stock available for future issuance under the LTIP.

Since the approval of the LTIP, we have issued to eligible participants restricted stock units, performance share awards and stock only stock appreciation rights (“SOSARs”).

Restricted Stock Units (“RSUs”) and Performance Share Awards (“PSAs”)Awards of RSUs and PSAs are made under our LTIP. The vesting of RSUs is generally based on the passage of time, generally on a graded scale over a three, four, and five-year period. Beginning in March of 2011, PSAs were issued annually to members of senior management and each respective grant cliff vests each December 31, assuming the achievement of predetermined, multi-year cumulative performance targets. 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. For both RSUs and PSAs, 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. Settlement of RSUs and PSAs will be made in shares of our common stock currently held in treasury.

The following table summarizes RSU and PSA activity during the past three years:

Units	2017			2016			2015
Balance at January 1,		679,038			674,523			888,942
Granted		375,435			302,722			164,666
Forfeited		(96,306	)		(148,232	)		(92,183	)
Shares delivered		(28,781	)		(149,975	)		(286,902	)
Balance at December 31,		929,386			679,038			674,523

	2017		2016		2015
Compensation expense	$	4,843	$	3,154	$	1,758

The amount granted in 2017, 2016 and 2015 includes 163,274, 199,693 and 105,017 PSAs, respectively, exclusive of reinvested dividends. The weighted average grant date fair value per unit for awards in 2017, 2016 and 2015 was $22.32, $18.08 and $24.62, respectively. As of December 31, 2017, unrecognized compensation expense for outstanding RSUs and PSAs totaled $6.7 million. The weighted average remaining period over which the expense will be recognized is 1.9 years.

Stock Only Stock Appreciation RightsThe following table sets forth information related to outstanding SOSARS:

	2017					2016					2015
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		2,736,616		$	17.64		2,199,742		$	17.82		1,864,707		$	16.20
Granted		—			—		743,925			17.54		423,590		24.62
Exercised		(157,140	)		13.76		(61,190	)		10.70		(70,347	)		14.12
Canceled / forfeited		(17,630	)		18.46		(145,861	)		22.80		(18,208	)		25.41
Outstanding at December 31,		2,561,846		$	17.87		2,736,616		$	17.64		2,199,742		$	17.82
Exercisable at December 31,		2,011,075			17.56		1,740,591		16.19			1,504,599			14.48
Vested and expected to vest		2,561,846					2,725,611					2,178,708
SOSAR Grants
Weighted average grant date    fair value per share		—				$	4.07				$	7.46
Aggregate grant date    fair value (in thousands)		—				$	3,013				$	3,134
Black-Scholes assumptions
Dividend yield		—					2.85	%				1.94	%
Risk free rate of return		—					1.34	%				1.64	%
Volatility		—					31.97	%				36.38	%
Expected life		—				6					6
Compensation expense    (in thousands)	$	1,371				$	2,735				$	2,645

Under terms of the SOSAR, the recipients receive the right to receive a payment in the form of shares of common stock equal to the difference, if any, in the fair market value of one share of common stock at the time of exercising the SOSAR and the exercise price. The SOSARs vest ratably over a three year period. No SOSARs were issued during 2017. As of December 31, 2017, the intrinsic value of SOSARs vested and expected to vest totaled $12.4 million and the remaining weighted average contractual life of outstanding SOSARs was 5.2 years.

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Retirement Plans and Other Post-Retirement Benefits

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Retirement Plans and Other Post-Retirement Benefits

10. RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS

We provide non-contributory retirement benefits under both funded and unfunded plans to all U.S. employees and to certain non-U.S. employees. Participation and benefits under the plans are based upon the employees’ date of hire and the covered group in which that employee falls. U.S. benefits are based on either a unit-benefit formula for bargained hourly employees, or a final average pay formula or cash balance formula for salaried employees. Non-U.S. benefits are based, in the case of certain plans, on average salary and years of service and, in the case of other plans, on a fixed amount for each year of service. U.S. plan provisions and funding meet the requirements of the Employee Retirement Income Security Act of 1974. We use a December 31-measurement date for all of our defined benefit plans.

We also provide certain health care benefits to eligible U.S.-based retired employees. Participation in the plan is closed to any salaried employees hired after December 31, 2006. Participation is closed to any hourly union employees in our Pennsylvania operations hired after January 16, 2011. Hourly union employees in our Ohio operations are eligible to participate upon attaining age 55 with five years of service. These benefits include a comprehensive medical plan for retirees prior to age 65 and a fixed payment to certain retirees over age 65 to help defray the costs of Medicare. Claims are paid as reported.

	Pension Benefits						Other Benefits
In millions	2017			2016			2017			2016
Change in    Benefit    Obligation
Balance at    beginning of    year	$	552.0		$	541.9		$	47.9		$	51.0
Service cost		10.7			10.5			1.2			1.1
Interest cost		23.8			24.5			2.0			2.0
Plan amendments		4.1			5.5			—			—
Participant    contributions		—			—			1.1			1.0
Actuarial    (gain)/loss		45.5			17.0			1.5			(3.4	)
Benefits paid		(36.5	)		(22.9	)		(3.0	)		(3.8	)
One-time settlement		—			(24.2	)		—			—
Effect of currency    rate changes		1.2			(0.3	)		—			—
Balance at end    of year	$	600.8		$	552.0		$	50.7		$	47.9
Change in    Plan Assets
Fair value of plan    assets at    beginning of year	$	610.7		$	594.9		$	—		$	—
Actual return    on plan assets		96.8			60.8			—			—
Total contributions		2.1			2.1			3.0			3.8
Benefits paid		(36.5	)		(22.9	)		(3.0	)		(3.8	)
One-time settlement		—			(24.2	)		—			—
Fair value of plan    assets at end    of year	$	673.1			610.7			—			—
Funded status at    end of year	$	72.3		$	58.7		$	(50.7	)	$	(47.9	)

In 2016, we recorded a pension settlement charge of $7.3 million and settled $24.2 million of benefits in connection with a voluntary program offered to deferred vested terminated participants.

Amounts recognized in the consolidated balance sheets consist of the following as of December 31:

	Pension Benefits						Other Benefits
In millions	2017			2016			2017			2016
Other assets	$	115.5		$	96.7		$	—		$	—
Current liabilities		(2.2	)		(2.0	)		(3.5	)		(3.2	)
Other long-term    liabilities		(41.0	)		(36.0	)		(47.2	)		(44.7	)
Net amount    recognized	$	72.3		$	58.7		$	(50.7	)	$	(47.9	)

The components of amounts recognized as “Accumulated other comprehensive income” consist of the following on a pre-tax basis:

	Pension Benefits				Other Benefits
In millions	2017		2016		2017			2016
Prior service    cost/(credit)	$	16.1	$	14.8	$	(0.5	)	$	(0.6	)
Net actuarial loss		145.6		165.9		(5.6	)		(7.4	)

The accumulated benefit obligation for all defined benefit pension plans was $584.3 million and $537.6 million at December 31, 2017 and 2016, respectively.

The weighted-average assumptions used in computing the benefit obligations above were as follows:

	Pension Benefits						Other Benefits
	2017			2016			2017			2016
Discount rate –    benefit    obligation		3.85	%		4.43	%		3.68	%		4.18	%
Future    compensation    growth rate		3.00			3.00			—			—

The discount rates set forth above were estimated based on the modeling of expected cash flows for each of our benefit plans and selecting a portfolio of high-quality debt instruments with maturities matching the respective cash flows of each plan. The resulting discount rates as of December 31, 2017 ranged from 1.90% to 4.55% for pension plans and from 4.02% to 4.21% for other benefit plans.

Information for pension plans with an accumulated benefit obligation in excess of plan assets was as follows:

In millions	2017		2016
Projected benefit obligation	$	43.1	$	37.9
Accumulated benefit    obligation		38.6		34.6
Fair value of plan assets		—		—

Net periodic benefit cost includes the following components:

	Year Ended December 31
In millions	2017			2016			2015
Pension Benefits
Service cost	$	10.7		$	10.5		$	11.6
Interest cost		23.8			24.5			23.3
Expected return on plan    assets		(43.0	)		(45.4	)		(46.0	)
Amortization of prior    service cost		2.8			2.7			3.1
Amortization of    actuarial loss		12.3			13.2			17.1
One-time settlement    charge		—			7.3			—
Total net periodic benefit cost	$	6.6		$	12.8		$	9.1
Other Benefits
Service cost	$	1.2		$	1.1		$	1.4
Interest cost		2.0			2.0			2.0
Amortization of prior    service cost/(credit)		(0.2	)		(0.2	)		(0.3	)
Amortization of    actuarial loss		(0.4	)		(0.8	)		0.2
Total net periodic    benefit cost	$	2.6		$	2.1		$	3.3

The prior service cost and actuarial net loss for our defined benefit pension plans that will be amortized from accumulated other comprehensive income (loss) into our results of operations as a component of net periodic benefit cost over the next fiscal year are $3.1 million and $13.5 million, respectively. The comparable amounts of expected amortization for other benefit plans are a credit of $0.2 million and $0.3 million, respectively.

Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) were as follows:

	Year Ended December 31
In millions	2017			2016
Pension Benefits
Actuarial (gain) loss	$	(8.3	)	$	1.4
Plan amendments		4.1			5.5
Recognized prior service cost		(2.8	)		(2.7	)
Recognized actuarial losses		(12.3	)		(20.5	)
Total recognized in other    comprehensive loss		(19.3	)		(16.3	)
Total recognized in net periodic    benefit cost and other    comprehensive loss	$	(12.7	)	$	(3.5	)
Other Benefits
Actuarial (gain) loss	$	1.5		$	(3.4	)
Amortization of prior service cost		0.2			0.2
Amortization of actuarial losses		0.4			0.8
Total recognized in other    comprehensive (income) loss		2.1			(2.4	)
Total recognized in net periodic    benefit cost and other    comprehensive (income) loss	$	4.7		$	(0.3	)

The weighted-average assumptions used in computing the net periodic benefit cost information above were as follows:

	Year Ended December 31
	2017			2016			2015
Pension Benefits
Discount rate – benefit expense		4.43	%		4.65	%		4.21	%
Future compensation growth rate		3.00			3.50			4.00
Expected long-term rate of return    on plan assets		7.25			7.75			8.00
Other Benefits
Discount rate – benefit expense		4.18	%		4.38	%		3.89	%

To develop the expected long-term rate of return assumption, we considered the historical returns and the future expected returns for each asset class, as well as the target asset allocation of the pension portfolio.

Assumed health care cost trend rates used to determine benefit obligations at December 31 were as follows:

	2017			2016
Health care cost trend rate    assumed for next year		6.20	%		6.50	%
Rate to which the cost    trend rate is assumed to    decline (the ultimate trend rate)		4.50			4.50
Year that the rate reaches    the ultimate rate	2037			2037

Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects:

	One Percentage Point
In millions	Increase		Decrease
Effect on:
Post-retirement benefit obligation	$	3.9	$	(3.5	)
Total of service and interest    cost components		0.3		(0.3	)

Plan Assets All pension plan assets in the U.S. are invested through a single master trust fund. The strategic asset allocation for this trust fund is selected by management, reflecting the results of comprehensive asset and liability modeling. The general principles guiding U.S. pension asset investment policies are those embodied in the Employee Retirement Income Security Act of 1974 (ERISA). These principles include discharging our investment responsibilities for the exclusive benefit of plan participants and in accordance with the “prudent expert” standard and other ERISA rules and regulations. We establish strategic asset allocation percentage targets and appropriate benchmarks for significant asset classes with the aim of achieving a prudent balance between return and risk.

Investments and decisions will be made solely in the interest of the Plan’s participants and beneficiaries, and for the exclusive purpose of providing benefits accrued thereunder. The primary goal of the Plan is to ensure the solvency of the Plan over time and thereby meet its distribution objectives. All investments in the Plan will be made in accordance with ERISA and other applicable statutes.

Risk is minimized by diversification by asset class, by style of each manager and by sector and industry limits when applicable. The targeted range of investment allocations of Plan assets is as follows:

	Range
Domestic Equity		35	%	-		45	%
International equity	8			-	14
Real Estate Investment     Trusts (REIT)	2			-	6
Fixed income, cash    and cash equivalents	55			-	35

Diversification of plan assets is achieved by:

i. placing restrictions on the percentage of equity investments in any one company, percentage of investment in any one industry, limiting the amount of assets placed with any one manager; and

ii. setting targets for duration of fixed income securities, maintaining a certain level of credit quality, and limiting the amount of investment in a single security and in non-investment grade paper.

A formal asset allocation review is done periodically to ensure that the Plan has an appropriate asset allocation based on the Plan’s projected benefit obligations. It is expected that asset class performance will meet or exceed that of the assigned indices, and be at least at the median relative to other professionally managed accounts in its peer group. The target return for cash and cash equivalents is a return that at least equals that of the 90-day T-bills.

The Investment Policy statement lists specific categories of securities or activities that are prohibited including options, futures, commodities, hedge funds, limited partnerships, and our stock.

The table below presents the fair values of our benefit plan assets by level within the fair value hierarchy, as described in Note 2:

	December 31, 2017
In millions	Total		Level 1		Level 2		Level 3
Domestic Equity
Large cap	$	214.9	$	12.4	$	202.5	$	—
Small and mid    cap		46.2		46.2		—		—
International    equity		81.4		7.2		74.2		—
REIT		27.6		27.6		—		—
Fixed income		290.9		24.0		266.9		—
Cash and    equivalents		12.1		0.1		12.0		—
Total	$	673.1	$	117.5	$	555.6	$	—

	December 31, 2016
In millions	Total		Level 1		Level 2		Level 3
Domestic Equity
Large cap	$	201.9	$	7.1	$	194.8	$	—
Small and mid    cap		50.9		50.9		—		—
International    equity		79.5		38.8		40.7		—
REIT		27.9		27.9		—		—
Fixed income		237.7		28.5		209.2		—
Cash and    equivalents		12.8		—		12.8		—
Total	$	610.7	$	153.2	$	457.5	$	—

Cash Flow   We were not required to make contributions to our qualified pension plan in 2017 nor do we expect to make any to this plan in 2018. Benefit payments expected to be made in 2018 under our non-qualified pension plans and other benefit plans are summarized below:

In thousands
Nonqualified pension plans	$	2,160
Other benefit plans		3,500

The following benefit payments under all pension and other benefit plans, and giving effect to expected future service, as appropriate, are expected to be paid:

In thousands	Pension Benefits		Other Benefits
2018	$	41,106	$	3,500
2019		39,993		4,129
2020		39,468		4,500
2021		39,375		4,663
2022		39,041		4,620
2023 through 2027		188,907		21,053

Defined Contribution Plans   We maintain 401(k) plans for certain hourly and salaried employees. Employees may contribute up to 50% of their earnings, subject to certain restrictions. Through November 2015, we matched a portion of the employee’s contribution, subject to certain limitations, in the form of shares of Glatfelter common stock out of treasury. Company matches are now made in cash. The expense associated with our 401(k) match was $2.3 million, $2.0 million and $2.1 million in 2017, 2016 and 2015, respectively.

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Inventories

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories

11. INVENTORIES

Inventories, net of reserves were as follows:

	December 31
In thousands		2017		2016
Raw materials	$	60,806	$	66,359
In-process and finished		116,678		112,507
Supplies		74,580		70,803
Total	$	252,064	$	249,669

We value all of our U.S. inventories, excluding supplies, on the LIFO method. If we had valued these inventories using the first-in, first-out method, inventories would have been $22.7 million and $21.3 million higher than reported at December 31, 2017 and 2016, respectively.

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Plant, Equipment and Timberlands

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Plant, Equipment and Timberlands

12. PLANT, EQUIPMENT AND TIMBERLANDS

Plant, equipment and timberlands at December 31 were as follows:

In thousands		2017			2016
Land and buildings	$	221,436		$	192,877
Machinery and equipment		1,484,545			1,335,669
Furniture, fixtures, and other		174,462			142,110
Accumulated depreciation		(1,125,203	)		(1,036,825	)
		755,240			633,831
Construction in progress		105,673			137,665
Timberlands, less depletion		4,830			4,402
Total	$	865,743		$	775,898

As of December 31, 2017 and 2016, we had $21.0 million and $24.3 million, respectively, of accrued capital expenditures.

The following table sets forth amounts of interest expense capitalized in connection with major capital projects:

	Year Ended December 31
	2017		2016		2015
Interest cost incurred	$	19,852	$	17,431	$	17,815
Interest capitalized		2,080		1,609		351
Interest expense	$	17,772	$	15,822	$	17,464

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Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

13. GOODWILL AND INTANGIBLE ASSETS

The following table sets forth information with respect to goodwill and other intangible assets:

	December 31
In thousands		2017			2016
Goodwill – Composite Fibers	$	82,744		$	73,094
Specialty Papers
Customer relationships	$	6,155		$	6,155
Composite Fibers
Tradename		4,773			4,195
Technology and related		40,686			35,874
Customer relationships and related		36,705			32,310
Advanced Airlaid Materials
Technology and related		1,488			1,377
Customer relationships and related		3,001			2,638
Total intangibles		92,808			82,549
Accumulated amortization		(33,949	)		(26,290	)
Net intangibles	$	58,859		$	56,259

The change in the gross value of goodwill and intangible assets was due to currency translation adjustments. Other than non-amortizable goodwill and tradename, intangible assets are amortized on a straight-line basis. Customer relationships are amortized over periods ranging from 10 years to 14 years and technology and related intangible assets are amortized over periods ranging from 14 years to 20 years. The following table sets forth information pertaining to amortization of intangible assets:

In thousands			2017		2016		2015
Aggregate amortization    expense:		$	4,773	$	4,852	$	5,340
Estimated amortization    expense:
	2018		4,773
	2019		4,773
	2020		4,639
	2021		4,254
	2022		4,139

The remaining weighted average useful life of intangible assets was 12.2 years at December 31, 2017.

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Other Long-Term Assets

12 Months Ended

Dec. 31, 2017

Other Assets Noncurrent [Abstract]

Other Long-Term Assets

14. OTHER LONG-TERM ASSETS

Other long-term assets consist of the following:

	December 31
In thousands		2017		2016
Pension	$	115,482	$	96,699
Other		22,996		25,050
Total	$	138,478	$	121,749

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Other Current Liabilities

12 Months Ended

Dec. 31, 2017

Other Liabilities Disclosure [Abstract]

Other Current Liabilities

15. OTHER CURRENT LIABILITIES

Other current liabilities consist of the following:

	December 31
In thousands		2017		2016
Accrued payroll and benefits	$	39,375	$	48,306
Other accrued compensation    and retirement benefits		7,864		6,828
Income taxes payable		1,927		211
Accrued rebates		16,126		14,329
Other accrued expenses		45,930		49,576
Total	$	111,222	$	119,250

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Long-Term Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

16. LONG-TERM DEBT

Long-term debt is summarized as follows:

	December 31
In thousands		2017			2016
Revolving credit facility, due Mar. 2020	$	171,200		$	61,595
5.375% Notes, due Oct. 2020		250,000			250,000
2.40% Term Loan, due Jun. 2022		7,710			8,282
2.05% Term Loan, due Mar. 2023		33,607			35,163
1.30% Term Loan, due Jun. 2023		9,423			9,788
1.55% Term Loan, due Sep. 2025		11,390			10,333
Total long-term debt		483,330			375,161
Less current portion		(11,298	)		(8,961	)
Unamortized deferred issuance costs		(1,934	)		(2,553	)
Long-term debt, net of current portion	$	470,098		$	363,647

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 Agreement was further amended to, among other things, 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 December 31, 2017, the leverage ratio, as calculated in accordance with the definition in our amended credit agreement was 2.5x. 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 now 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., Inc., 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 Agreement at maturity or a default under the Revolving Credit Agreement that accelerates the debt outstanding thereunder. As of December 31, 2017, 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, will be calculated by reference to our Revolving Credit Agreement.

Aggregated unamortized deferred debt issuance costs incurred in connection with all of our outstanding debt totaled $3.0 million at December 31, 2017. The deferred costs are being amortized on a straight line basis over the life of the underlying instruments. Amortization expense related to deferred debt issuance costs totaled $1.2 million in 2017.

The following schedule sets forth the amortization of our term loan agreements together with the maturity of our other long-term debt during the indicated year.

In thousands
2018	$	11,298
2019		11,297
2020		432,497
2021		11,297
2022		10,441
Thereafter		6,500

P. H. Glatfelter Company guarantees all debt obligations of its subsidiaries. All such obligations are recorded in these consolidated financial statements.

As of December 31, 2017 and 2016, we had $5.2 million and $5.1 million, respectively, of letters of credit issued to us by certain financial institutions. The letters of credit, which reduce amounts available under our revolving credit facility, 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.

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Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

17. FAIR VALUE OF FINANCIAL INSTRUMENTS

The amounts reported on the consolidated balance sheets for cash and cash equivalents, accounts receivable and short-term debt approximate fair value. The following table sets forth the carrying value and fair value of long-term debt as of December 31:

	2017				2016
In thousands	Carrying Value		Fair Value		Carrying Value		Fair Value
Variable rate debt	$	171,200	$	171,200	$	61,595	$	61,595
Fixed-rate bonds		250,000		253,823		250,000		256,563
2.40% Term loan		7,710		7,889		8,282		8,877
2.05% Term loan		33,607		34,122		35,163		37,089
1.30% Term Loan		9,423		9,370		9,788		10,062
1.55% Term loan		11,390		11,320		10,333		10,082
Total	$	483,330	$	487,724	$	375,161	$	384,268

As of December 31, 2017 and 2016, we had $250.0 million of 5.375% fixed rate bonds. These bonds are publicly registered, but thinly traded. Accordingly, the values set forth above for the bonds, as well as our other debt instruments, are based on observable inputs and other relevant market data (Level 2). The fair value of financial derivatives is set forth below in Note 18.

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Financial Derivatives and Hedging Activities

12 Months Ended

Dec. 31, 2017

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Financial Derivatives and Hedging Activities

18. 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 over a maximum of eighteen months. Currency forward contracts involve fixing the EUR-USD exchange rate or USD-CAD for delivery of a specified amount of foreign currency on a specified date.

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 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 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:

	December 31
In thousands		2017	2016
Derivative
Sell/Buy - sell notional
Philippine Peso / British Pound		19,047	—
Euro / British Pound		13,586	10,373
Euro / U.S. Dollar		1,048	—
U.S. Dollar / Euro		946	—
Sell/Buy - buy notional
Euro / Philippine Peso		890,096	699,279
British Pound / Philippine Peso		797,496	557,025
Euro / U.S. Dollar		60,519	43,951
U.S. Dollar / Canadian Dollar		32,265	35,290
British Pound / Euro		335	—
U.S. Dollar / Euro		4,253	15,379

These contracts have maturities of eighteen months or less.

Derivatives Not Designated as Hedging Instruments - Foreign Currency Hedges We also enter into forward foreign exchange contracts to mitigate the impact changes in currency exchange rates have on balance sheet monetary assets and liabilities. None of these contracts are designated as hedges for financial accounting purposes and, accordingly, changes in value of the foreign exchange forward contracts and in the offsetting underlying on-balance-sheet transactions are reflected in the accompanying consolidated statements of income under the caption “Other, net.”

	December 31
In thousands		2017	2016
Derivative
Sell/Buy -  sell notional
U.S. Dollar / Euro		—	—
U.S. Dollar / British Pound		17,500	10,500
Euro / British Pound		—	—
British Pound / Euro		1,000	2,500
Sell/Buy - buy notional
Euro / U.S. Dollar		4,500	3,500
British Pound / Euro		13,000	18,500

These contracts have maturities of one month from the date originally entered into.

Fair Value Measurements

The following table summarizes the fair values of derivative instruments as of December 31 for the year indicated and the line items in the accompanying consolidated balance sheets where the instruments are recorded:

	December 31				December 31
In thousands		2017		2016		2017		2016
	Prepaid Expenses and Other				Other Current
Balance sheet caption	Current Assets				Liabilities
Designated as    hedging:
Forward foreign    currency exchange    contracts	$	1,066	$	2,625	$	4,787	$	1,493
Not designated as    hedging:
Forward foreign    currency exchange    contracts	$	151	$	60	$	43	$	104

The amounts set forth in the table above represent the net asset or liability giving effect to rights of offset with each counterparty.

The following table summarizes the amount of income or loss from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying consolidated statements of income where the results are recorded:

	Year ended December 31
In thousands	2017		2016			2015
Designated as    hedging:
Forward foreign    currency exchange    contracts:
Effective portion –    cost of products    sold	$	532	$	(551	)	$	5,752
Ineffective portion –    other – net		182		(166	)		(152	)
Not designated as    hedging:
Forward foreign    currency exchange    contracts:
Other – net	$	882	$	806		$	599

The impact of activity not designated as hedging was substantially all offset by the remeasurement of the underlying on-balance sheet item.

The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described in Note 2.

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 accompanying consolidated balance sheets under the caption “Prepaid expenses and other current assets” and the value of contracts in a loss position is recorded under the caption “Other current liabilities.”

A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income is as follows:

In thousands	2017			2016
Balance at January 1,	$	1,882		$	(178	)
Deferred (losses) gains    on cash flow hedges		(6,990	)		1,509
Reclassified to earnings		(532	)		551
Balance at December 31,	$	(5,640	)	$	1,882

We expect substantially all of the amounts recorded as a component of accumulated other comprehensive income will be realized in results of operations within the next twelve to eighteen months and the amount ultimately recognized will vary depending on actual market rates.

Credit risk related to derivative activity arises in the event a counterparty fails to meet its obligations to us. This exposure is generally limited to the amounts, if any, by which the counterparty’s obligations exceed our obligation to them. Our policy is to enter into contracts only with financial institutions which meet certain minimum credit ratings.

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Shareholders' Equity

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Shareholders' Equity

19. SHAREHOLDERS’ EQUITY

The following table summarizes outstanding shares of common stock:

	Year ended December 31
In thousands	2017		2016		2015
Shares outstanding at    beginning of year		43,550		43,420		43,054
Treasury shares issued    for:
Restricted stock awards		28		108		206
401(k) plan		—		—		134
Employee stock options    exercised		36		22		26
Shares outstanding at end    of year		43,614		43,550		43,420

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Commitments, Contingencies and Legal Proceedings

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Commitments, Contingencies and Legal Proceedings

20. COMMITMENTS, CONTINGENCIES AND LEGAL PROCEEDINGS

Contractual Commitments The following table summarizes the minimum annual payments due on noncancelable operating leases and other similar contractual obligations having initial or remaining terms in excess of one year:

In thousands	Leases		Other
2018	$	12,683	$	115,710
2019		5,926		31,415
2020		4,393		18,674
2021		3,276		1,705
2022		2,932		4
Thereafter		8,431		1

Other contractual obligations primarily represent minimum purchase commitments under energy supply contracts and other purchase obligations.

At December 31, 2017, required minimum annual payments due under operating leases and other similar contractual obligations aggregated $37.6 million and $167.5 million, respectively.

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, 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 to be in our favor.

Cost estimates. The 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. 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 claimed to have incurred about $34 million in unreimbursed costs, an amount that we dispute. The State had no unreimbursed costs, and had on hand approximately $4 million of unspent settlement money. Further, the NRDAR Fund had received what the Governments claim to have been approximately $104 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. 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 off-set, an amount likely to exceed all of the Governments’ past and future costs of response. The Governments disagree. No date has yet been set for trial of the issue.

So long as the NCR/Appvion consent decree remains in effect, we would also remain subject to our 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. Although we are unable to determine with certainty the timing of cash expenditures for the above matters, they are reasonably likely to extend over a period of at least 30 years.

Reserves for the Site. Our reserve for all remaining claims against us relating to PCB contamination is set forth below:

	Year ended December 31
In thousands		2017			2016
Balance at January 1,	$	52,788		$	17,105
Payments		(9,644	)		(4,317	)
Accruals		-			40,000
Balance at December 31,	$	43,144		$	52,788

The payments set forth above represent cash paid towards completion of remediation activities in connection with the 2016 and 2015 Work Plans, the Georgia-Pacific settlement and ongoing monitoring activities. Of our total reserve for the Fox River, $28.5 million is recorded in the accompanying December 31, 2017 consolidated balance sheet under the caption “Environmental liabilities” and the remaining $14.6 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 and results of operations and might result in a default under our loan covenants.

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Segment and Geographic Information

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment and Geographic Information

21. SEGMENT AND GEOGRAPHIC INFORMATION

The following tables set forth profitability and other information by business unit:

For the year ended December 31, 2017	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	544.3	$	256.1	$	790.9	$	—		$	1,591.3
Energy and related sales, net		—		—		5.1		—			5.1
Total revenue		544.3		256.1		796.0		—			1,596.4
Cost of products sold		437.6		216.7		734.2		15.4			1,403.9
Gross profit		106.7		39.4		61.8		(15.4	)		192.5
SG&A		44.4		9.3		46.4		34.3			134.4
Loss on dispositions of plant, equipment    and timberlands, net		—		—		—		—			—
Total operating income (loss)		62.3		30.1		15.4		(49.7	)		58.1
Non-operating expense		—		—		—		(18.8	)		(18.8	)
Income (loss) before income taxes	$	62.3	$	30.1	$	15.4	$	(68.5	)	$	39.3
Supplementary Data
Plant, equipment and timberlands, net	$	254.0	$	235.6	$	360.5	$	15.6		$	865.7
Depreciation, depletion and amortization		28.3		9.6		30.8		7.3			76.0
Capital expenditures		15.9		50.6		51.5		14.3			132.3

For the year ended December 31, 2016	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	517.0	$	244.3	$	843.6	$	—		$	1,604.8
Energy and related sales, net		—		—		6.1		—			6.1
Total revenue		517.0		244.3		849.7		—			1,610.9
Cost of products sold		416.4		209.5		752.6		13.9			1,392.3
Gross profit		100.6		34.8		97.1		(13.9	)		218.7
SG&A		46.3		8.4		55.9		80.1			190.7
Gains on dispositions of plant, equipment    and timberlands, net		—		—		—		0.2			0.2
Total operating income (loss)		54.3		26.4		41.2		(94.2	)		27.8
Non-operating expense		—		—		—		(16.9	)		(16.9	)
Income (loss) before income taxes	$	54.3	$	26.4	$	41.2	$	(111.1	)	$	10.9
Supplementary Data
Plant, equipment and timberlands, net	$	235.1	$	179.3	$	352.9	$	8.6		$	775.9
Depreciation, depletion and amortization		27.8		9.0		26.3		2.7			65.8
Capital expenditures		18.8		36.8		99.0		5.6			160.2

For the year ended December 31, 2015	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	541.5	$	244.6	$	875.0	$	—		$	1,661.1
Energy and related sales, net		—		—		5.7		—			5.7
Total revenue		541.5		244.6		880.7		—			1,666.8
Cost of products sold		434.4		215.7		804.5		9.2			1,463.8
Gross profit		107.1		28.9		76.2		(9.2	)		203.0
SG&A		45.7		7.6		43.3		31.0			127.7
Gains on dispositions of plant, equipment    and timberlands, net		—		—		—		(21.1	)		(21.1	)
Total operating income (loss)		61.4		21.3		32.9		(19.1	)		96.4
Non-operating expense		—		—		—		(17.8	)		(17.8	)
Income (loss) before income taxes	$	61.4	$	21.3	$	32.9	$	(36.9	)	$	78.6
Supplementary Data
Plant, equipment and timberlands, net	$	258.1	$	153.5	$	282.0	$	5.7		$	698.9
Depreciation, depletion and amortization		26.2		8.8		26.0		2.2			63.2
Capital expenditures		26.8		7.8		63.5		1.8			99.9

The sum of individual amounts set forth above may not agree to the consolidated financial statements included herein due to rounding.

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.

Management evaluates results of operations of the business units before pension expense, certain corporate level costs, and the effects of certain gains or losses not considered to be related to the core business operations. Management believes that this is a more meaningful representation of the operating performance of its core businesses, the profitability of 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.

Our Composite Fibers business unit serves customers globally and focuses on higher value-added products in the following markets:

• Food & Beverage filtration paper primarily used for single-serve coffee and tea products;

• Wallcovering base materials used by the world’s largest wallpaper manufacturers;

• Technical Specialties a diverse line of special paper products used in applications such as electrical energy storage, transport and transmission, wipes, and other highly-engineered fiber-based applications;

• Composite Laminate paper used in production of decorative laminates, furniture, and flooring applications; and

• Metallized products used in labels, packaging liners, gift wrap, and other consumer product applications.

Composite Fibers’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Food & beverage	$	268,474	$	258,463	$	274,865
Wallcovering		103,011		90,767		91,620
Technical specialties and    other		76,991		71,558		71,689
Composite laminates		38,696		35,107		34,897
Metallized		57,088		61,059		68,397
Total	$	544,260	$	516,954	$	541,468

The Advanced Airlaid Materials business unit is a leading global supplier of highly absorbent cellulose-based airlaid nonwoven materials primarily used to manufacture consumer products for growing global end-user markets. These products include:

• feminine hygiene;

• specialty wipes;

• adult incontinence;

• home care; and

• other consumer products.

Advanced Airlaid Materials’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Feminine hygiene	$	179,670	$	173,902	$	182,048
Specialty wipes		29,519		25,206		22,950
Adult incontinence		14,425		12,281		10,720
Home care		13,029		12,630		13,345
Other		19,458		20,243		15,526
Total	$	256,101	$	244,262	$	244,589

Our Specialty Papers business unit focuses on producing papers for the following markets:

• Carbonless & non-carbonless forms papers for credit card receipts, multi-part forms, security papers and other end-user applications;

• Engineered products for high speed ink jet printing, office specialty products, greeting cards, and other niche specialty applications;

• Envelope and converting papers primarily utilized for transactional and direct mail envelopes; and

• Book publishing papers for the production of high quality hardbound books and other book publishing needs.

Specialty Papers’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Carbonless & forms	$	292,071	$	319,648	$	349,831
Engineered products		189,930		189,463		190,943
Envelope & converting		154,291		173,362		178,067
Book publishing		152,576		157,541		152,647
Other		2,067		3,568		3,538
Total	$	790,935	$	843,582	$	875,026

No individual customer accounted for more than 10% of our consolidated net sales in 2017, 2016 and 2015. However, one customer accounted for the majority of Advanced Airlaid Materials’ net sales in each of the past three years ended December 31, 2017.

Our net sales to external customers and location of net plant, equipment and timberlands are summarized below. Net sales are attributed to countries based upon origin of shipment.

	2017				2016				2015
In thousands	Net sales		Plant, Equipment and Timberlands – Net		Net sales		Plant, Equipment and Timberlands – Net		Net sales		Plant, Equipment and Timberlands – Net
United States	$	880,708	$	456,223	$	918,567	$	391,977	$	959,730	$	287,447
Germany		450,668		240,932		427,520		220,380		444,009		232,340
United Kingdom		76,594		55,495		78,759		51,903		86,442		62,931
Canada		120,434		78,220		115,902		79,727		118,568		81,201
Other		62,893		34,873		64,049		31,911		52,335		34,945
Total	$	1,591,297	$	865,743	$	1,604,797	$	775,898	$	1,661,084	$	698,864

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Condensed Consolidating Financial Statements

12 Months Ended

Dec. 31, 2017

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Financial Statements

22. 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., Glatfelter Advance Materials N.A., Inc., 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; and (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 and cash flows for the years ended December 31, 2017, 2016 and 2015 and our condensed consolidating balance sheets as of December 31, 2017 and 2016.

Condensed Consolidating Statement of Income for the

year ended December 31, 2017

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	790,933		$	89,787		$	798,603		$	(88,026	)	$	1,591,297
Energy and related sales, net		5,126			—			—			—			5,126
Total revenues		796,059			89,787			798,603			(88,026	)		1,596,423
Costs of products sold		747,736			85,196			659,007			(88,026	)		1,403,913
Gross profit		48,323			4,591			139,596			—			192,510
Selling, general and administrative
expenses		69,483			2,598			62,313			—			134,394
(Gain) loss on dispositions of plant
equipment and timberlands, net		223			(188	)		(9	)		—			26
Operating income (loss)		(21,383	)		2,181			77,292			—			58,090
Other non-operating
income (expense)
Interest expense		(20,394	)		(971	)		(1,801	)		5,394			(17,772	)
Interest income		599			4,947			85			(5,394	)		237
Equity in earnings of subsidiaries		18,864			60,871			—			(79,735	)		—
Other, net		2,241			(6,776	)		3,315			—			(1,220	)
Total other non-operating
income (expense)		1,310			58,071			1,599			(79,735	)		(18,755	)
Income (loss) before income taxes		(20,073	)		60,252			78,891			(79,735	)		39,335
Income tax provision (benefit)		(27,987	)		41,388			18,020			—			31,421
Net income		7,914			18,864			60,871			(79,735	)		7,914
Other comprehensive income		63,931			52,290			51,828			(104,118	)		63,931
Comprehensive income	$	71,845		$	71,154		$	112,699		$	(183,853	)	$	71,845

Condensed Consolidating Statement of Income for the

year ended December 31, 2016

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	843,582		$	75,000		$	755,860		$	(69,645	)	$	1,604,797
Energy and related sales, net		6,141			—			—			—			6,141
Total revenues		849,723			75,000			755,860			(69,645	)		1,610,938
Costs of products sold		763,109			70,991			627,880			(69,645	)		1,392,335
Gross profit		86,614			4,009			127,980			—			218,603
Selling, general and administrative
expenses		133,387			(156	)		57,463			—			190,694
Loss on dispositions of plant
equipment and timberlands, net		177			—			39			—			216
Operating income (loss)		(46,950	)		4,165			70,478			—			27,693
Other non-operating
income (expense)
Interest expense		(17,436	)		(41	)		(3,060	)		4,715			(15,822	)
Interest income		687			4,177			57			(4,715	)		206
Equity in earnings of subsidiaries		61,007			58,347			—			(119,354	)		—
Other, net		(2,312	)		(3,966	)		5,007			—			(1,271	)
Total other non-operating
income (expense)		41,946			58,517			2,004			(119,354	)		(16,887	)
Income (loss) before income taxes		(5,004	)		62,682			72,482			(119,354	)		10,806
Income tax provision (benefit)		(26,558	)		1,675			14,135			—			(10,748	)
Net income		21,554			61,007			58,347			(119,354	)		21,554
Other comprehensive loss		(14,120	)		(25,916	)		(25,176	)		51,092			(14,120	)
Comprehensive income	$	7,434		$	35,091		$	33,171		$	(68,262	)	$	7,434

Condensed Consolidating Statement of Income for the

year ended December 31, 2015

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	875,026		$	84,704		$	779,380		$	(78,026	)	$	1,661,084
Energy and related sales, net		5,664			—			—			—			5,664
Total revenues		880,690			84,704			779,380			(78,026	)		1,666,748
Costs of products sold		811,329			80,455			650,025			(78,026	)		1,463,783
Gross profit		69,361			4,249			129,355			—			202,965
Selling, general and administrative
expenses		71,751			821			55,134			—			127,706
Gain on dispositions of plant
equipment and timberlands, net		(19,720	)		(1,183	)		(210	)		—			(21,113	)
Operating income		17,330			4,611			74,431			—			96,372
Other non-operating
income (expense)
Interest expense		(18,147	)		—			(36,859	)		37,542			(17,464	)
Interest income		673			37,127			26			(37,543	)		283
Equity in earnings of subsidiaries		61,946			24,737			—			(86,683	)		—
Other, net		(3,389	)		(1,471	)		4,245			—			(615	)
Total other non-operating
income (expense)		41,083			60,393			(32,588	)		(86,684	)		(17,796	)
Income before income taxes		58,413			65,004			41,843			(86,684	)		78,576
Income tax provision (benefit)		(6,162	)		2,922			17,241			—			14,001
Net income		64,575			62,082			24,602			(86,684	)		64,575
Other comprehensive income (loss)		(35,616	)		(41,010	)		29,680			11,330			(35,616	)
Comprehensive income	$	28,959		$	21,072		$	54,282		$	(75,354	)	$	28,959

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 Balance Sheet as of December 31, 2016

In thousands	Parent Company		Guarantors			Non Guarantors		Adjustments/ Eliminations			Consolidated
Assets
Cash and cash equivalents	$	5,082	$	1,461		$	48,901	$	—		$	55,444
Other current assets		206,002		256,289			242,187		(265,663	)		438,815
Plant, equipment and timberlands, net		360,521		31,455			383,922		—			775,898
Investments in subsidiaries		789,565		540,029			—		(1,329,594	)		—
Other assets		123,010		—			128,092		—			251,102
Total assets	$	1,484,180	$	829,234		$	803,102	$	(1,595,257	)	$	1,521,259
Liabilities and Shareholders' Equity
Current liabilities	$	426,628	$	26,085		$	135,961	$	(265,663	)	$	323,011
Long-term debt		283,686		14,000			65,961		—			363,647
Deferred income taxes		10,221		(729	)		45,503		—			54,995
Other long-term liabilities		109,819		313			15,648		—			125,780
Total liabilities		830,354		39,669			263,073		(265,663	)		867,433
Shareholders’ equity		653,826		789,565			540,029		(1,329,594	)		653,826
Total liabilities and shareholders’ equity	$	1,484,180	$	829,234		$	803,102	$	(1,595,257	)	$	1,521,259

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2017

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	(4,259	)	$	(3,506	)	$	112,027		$	—		$	104,262
Investing activities
Expenditures for purchases of plant, equipment and timberlands		(65,822	)		(45,644	)		(20,838	)		—			(132,304	)
Proceeds from disposals of plant, equipment and timberlands, net		11			209			8			—			228
Repayments from intercompany loans		—			12,000			—			(12,000	)		—
Advances of intercompany loans		—			(14,400	)		—			14,400			—
Intercompany capital contributed		(14,000	)		(400	)		—			14,400			—
Acquisitions, net of cash acquired		—			—			—			—			—
Other		(243	)		—			—			—			(243	)
Total investing activities		(80,054	)		(48,235	)		(20,830	)		16,800			(132,319	)
Financing activities
Net long-term borrowings		84,200			37,000			(21,535	)		—			99,665
Payment of dividends to shareholders		(22,480	)		—			—			—			(22,480	)
Repayments of intercompany loans		—			—			(12,000	)		12,000			—
Borrowings of intercompany loans		14,400			—			—			(14,400	)		—
Intercompany capital received		—			14,000			400			(14,400	)		—
Proceeds from government grants		4,875			—			—			—			4,875
Payments related to share-based compensation awards and other		(472	)		—			—			—			(472	)
Total financing activities		80,523			51,000			(33,135	)		(16,800	)		81,588
Effect of exchange rate on cash		—			—			7,244			—			7,244
Net increase (decrease) in cash		(3,790	)		(741	)		65,306			—			60,775
Cash at the beginning of period		5,082			1,461			48,901			—			55,444
Cash at the end of period	$	1,292		$	720		$	114,207		$	—		$	116,219

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2016

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	33,109		$	1,275		$	81,726		$	—		$	116,110
Investing activities
Expenditures for purchases of plant, equipment and timberlands		(104,595	)		(30,682	)		(24,881	)		—			(160,158	)
Proceeds from disposals of plant, equipment and timberlands, net		41			—			29			—			70
Repayments from intercompany loans		—			15,601			—			(15,601	)		—
Advances of intercompany loans		—			(18,330	)		—			18,330			—
Intercompany capital (contributed) returned		(17,000	)		(500	)		—			17,500			—
Other		(800	)		—			—			—			(800	)
Total investing activities		(122,354	)		(33,911	)		(24,852	)		20,229			(160,888	)
Financing activities
Net repayments of indebtedness		36,000			14,000			(35,886	)		—			14,114
Payments of borrowing costs		(136	)		—			—			—			(136	)
Payment of dividends to shareholders		(21,589	)		—			—			—			(21,589	)
Repayments of intercompany loans		—			—			(15,601	)		15,601			—
Borrowings of intercompany loans		18,330			—			—			(18,330	)		—
Intercompany capital (returned) received		—			17,000			500			(17,500	)		—
Payment of intercompany dividend		—			632			(632	)		—			—
Proceeds from government grants		3,582			2,000			—			—			5,582
Payments related to share-based compensation awards and other		(990	)		—			—			—			(990	)
Total financing activities		35,197			33,632			(51,619	)		(20,229	)		(3,019	)
Effect of exchange rate on cash		—			—			(2,063	)		—			(2,063	)
Net increase (decrease) in cash		(54,048	)		996			3,192			—			(49,860	)
Cash at the beginning of period		59,130			465			45,709			—			105,304
Cash at the end of period	$	5,082		$	1,461		$	48,901		$	—		$	55,444

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2015

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	34,391		$	627		$	98,725		$	—		$	133,743
Investing activities
Expenditures for plant, equipment and timberlands		(65,265	)		(109	)		(34,515	)		—			(99,889	)
Proceeds from disposal plant, equipment and timberlands, net		22,741			1,213			505			—			24,459
Repayments from intercompany loans		—			57,855			—			(57,855	)		—
Advances of intercompany loans		—			(49,230	)		—			49,230			—
Intercompany capital contributed, net		10,100			(300	)		—			(9,800	)		—
Acquisitions, net of cash acquired		—			—			(224	)		—			(224	)
Other		(1,600	)		—			—			—			(1,600	)
Total investing activities		(34,024	)		9,429			(34,234	)		(18,425	)		(77,254	)
Financing activities
Net proceeds from indebtedness		—			—			(24,650	)		—			(24,650	)
Payments of note offering costs		(1,329	)		—			—			—			(1,329	)
Payment of dividends to shareholders		(20,443	)		—			—			—			(20,443	)
Repayments of intercompany loans		(9,158	)		—			(48,697	)		57,855			—
Borrowings of intercompany loans		49,230			—			—			(49,230	)		—
Intercompany capital (returned) received		—			(10,100	)		300			9,800			—
Proceeds from government grants		421			—			—			—			421
Payments related to share-based compensation awards and other		(2,166	)		—			151			—			(2,015	)
Total financing activities		16,555			(10,100	)		(72,896	)		18,425			(48,016	)
Effect of exchange rate on cash		—			—			(3,006	)		—			(3,006	)
Net increase (decrease) in cash		16,922			(44	)		(11,411	)		—			5,467
Cash at the beginning of period		42,208			509			57,120			—			99,837
Cash at the end of period	$	59,130		$	465		$	45,709		$	—		$	105,304

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Quarterly Results

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results

23. QUARTERLY RESULTS (UNAUDITED)

															Earnings (loss)
In thousands,	Net sales				Gross profit				Net income (loss)						per share
except per share	2017		2016		2017		2016		2017			2016			2017			2016
First	$	390,713	$	402,218	$	56,929	$	57,843	$	11,603		$	16,168		$	0.26		$	0.37
Second		387,342		406,413		30,436		42,723		(5,714	)		1,965			(0.13	)		0.04
Third		413,325		405,301		54,735		61,170		12,105			19,601			0.27			0.44
Fourth		399,917		390,865		50,410		56,867		(10,080	)		(16,180	)		(0.23	)		(0.37	)

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Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

P. H. GLATFELTER COMPANY AND SUBSIDIARIES

SUPPLEMENTAL FINANCIAL STATEMENT SCHEDULE

For each of the three years ended December 31, 2017

Valuation and Qualifying Accounts

	Allowance for
In thousands	Doubtful Accounts									Sales Discounts and Deductions
	2017			2016			2015			2017			2016			2015
Balance, beginning of year	$	1,719		$	2,239		$	2,703		$	1,462		$	1,593		$	1,809
Provision		49			32			7			4,610			4,283			3,856
Write-offs, recoveries and    discounts allowed		(29	)		(497	)		(275	)		(4,697	)		(4,368	)		(3,649	)
Other (a)		218			(55	)		(196	)		68			(46	)		(423	)
Balance, end of year	$	1,957		$	1,719		$	2,239		$	1,443		$	1,462		$	1,593

The provision for doubtful accounts is included in selling, general and administrative expense and the provision for sales discounts and deductions is deducted from sales. The related allowances are deducted from accounts receivable.

(a) Relates primarily to changes in currency exchange rates.

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Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation    The consolidated financial statements include the accounts of Glatfelter and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.

Accounting Estimates

Accounting Estimates    The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies as of the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Management believes the estimates and assumptions used in the preparation of these consolidated financial statements are reasonable, based upon currently available facts and known circumstances, but recognizes that actual results may differ from those estimates and assumptions.

Cash and Cash Equivalents

Cash and Cash Equivalents    We classify all highly liquid instruments with an original maturity of three months or less at the time of purchase as cash equivalents.

Inventories

Inventories    Inventories are stated at the lower of cost or market. Raw materials, in-process and finished inventories of our U.S. manufacturing operations are valued using the last-in, first-out (LIFO) method, and the supplies inventories are valued principally using the average-cost method. Inventories at our foreign operations are valued using the average cost method.

Plant, Equipment and Timberlands

Plant, Equipment and Timberlands    For financial reporting purposes, depreciation is computed using the straight-line method over the estimated useful lives of the respective assets.

The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows:

Buildings	15 – 45 Years
Machinery and equipment	5 – 40 Years
Other	3 – 25 Years

Maintenance and Repairs

Maintenance and Repairs    Maintenance and repairs costs are charged to income and major renewals and betterments are capitalized. At the time property is retired or sold, the net carrying value is eliminated and any resultant gain or loss is included in income.

Valuation of Long-lived Assets, Intangible Assets and Goodwill

Valuation of Long-lived Assets, Intangible Assets and Goodwill    We evaluate long-lived assets for impairment when a specific event indicates that the carrying value of an asset may not be recoverable. Recoverability is assessed based on estimates of future cash flows expected to result from the use and eventual disposition of the asset. If the sum of expected undiscounted cash flows is less than the carrying value of the asset, the asset’s fair value is estimated and an impairment loss is recognized for the amount by which the carrying value exceeds the estimated fair value.

Goodwill and non-amortizing tradename intangible assets are reviewed, on a discounted cash flow basis, during the third quarter of each year for impairment or more frequently if impairment indicators are present. For Goodwill, impairment losses, if any, are recognized for the amount by which the carrying value of the reporting unit exceeds its fair value. The carrying value of a reporting unit is defined using an enterprise premise which is generally determined by the difference between the unit’s assets and operating liabilities.  With respect to tradename, impairment losses, if any, are recognized for the amount by which the carrying value of the tradename exceeds its fair value.

Income Taxes

Income Taxes    Income taxes are determined using the asset and liability method of accounting for income taxes in accordance with FASB ASC 740 Income Taxes (“ASC 740”). Under ASC 740, tax expense includes U.S. and international income taxes plus the provision for U.S. taxes on undistributed earnings of international subsidiaries not deemed to be permanently invested. Tax credits and other incentives reduce tax expense in the year the credits are claimed. Certain items of income and expense are not reported in tax returns and financial statements in the same year. The tax effect of such temporary differences is reported in deferred income taxes. Deferred tax assets are recognized if it is more likely than not that the assets will be realized in future years. We establish a valuation allowance for deferred tax assets for which realization is not more likely than not.

Significant judgment is required in determining our worldwide provision for income taxes and recording the related assets and liabilities. In the ordinary course of our business, there are many transactions and calculations where the ultimate tax determination is less than certain. We and our subsidiaries are examined by various Federal, State, and foreign tax authorities. We regularly assess the potential outcomes of these examinations and any future examinations for the current or prior years in determining the adequacy of our provision for income taxes. We continually assess the likelihood and amount of potential adjustments and record any necessary adjustments in the period in which the facts that give rise to a revision become known.

Investment tax credits are accounted for by the flow-through method, which results in recognition of the benefit in the year in which the credit become available.

Treasury Stock

Treasury Stock    Common stock purchased for treasury is recorded at cost. At the date of subsequent reissue, the treasury stock account is reduced by the cost of such stock on the weighted-average cost basis.

Foreign Currency Translation

Foreign Currency Translation    Foreign currency translation gains and losses and the effect of exchange rate changes on transactions designated as hedges of net foreign investments are included as a component of other comprehensive income (loss). Transaction gains and losses are included in income in the period in which they occur.

Revenue Recognition

Revenue Recognition    We recognize revenue on product sales when the customer takes title and assumes the risks and rewards of ownership. Substantially all of our revenue is earned pursuant to contracts under which we have one performance obligation that is satisfied at a point-in-time. Estimated costs for sales incentives, discounts and sales returns and allowances are recorded as sales deductions in the period in which the related revenue is recognized.

Revenue from energy sales is recognized when electricity is delivered to the customer. Certain costs associated with the production of electricity, such as fuel, labor, depreciation and maintenance are netted against energy sales for presentation on the consolidated statements of income.

Revenue from renewable energy credits is recorded under the caption “Energy and related sales, net” in the consolidated statements of income and is recognized when all risks, rights and rewards to the certificate are transferred to the counterparty.

Environmental Liabilities

Environmental Liabilities    Accruals for losses associated with environmental obligations are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated based on existing legislation and remediation technologies. These accruals are adjusted periodically as assessment and remediation actions continue and/or further legal or technical information develops. Such undiscounted liabilities are exclusive of any insurance or other claims against third parties. Environmental costs are capitalized if the costs extend the life of the asset, increase its capacity and/or mitigate or prevent contamination from future operations. Recoveries of environmental remediation costs from other parties, including insurance carriers, are recorded as assets when their receipt is assured beyond a reasonable doubt.

Earnings Per Share

Earnings Per Share    Basic earnings per share is computed by dividing net income by the weighted-average common shares outstanding during the respective periods. Diluted earnings per share is computed by dividing net income by the weighted-average common shares and common share equivalents outstanding during the period. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method.

Financial Derivatives and Hedging Activities

Financial Derivatives and Hedging Activities    We use financial derivatives to manage exposure to changes in foreign currencies. In accordance with FASB ASC 815 Derivatives and Hedging (“ASC 815”), we record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting, and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.

The effective portion of the gain or loss on those derivative instruments designated and qualifying as a hedge of the exposure to variability in expected future cash flows related to forecasted transactions is deferred and reported as a component of accumulated other comprehensive income (loss). Deferred gains or losses are reclassified to our results of operations at the time the hedged forecasted transaction is recorded in our results of operations. The effectiveness of cash flow hedges is assessed at inception and quarterly thereafter. If the instrument becomes ineffective or it becomes probable that the originally forecasted transaction will not occur, the related change in fair value of the derivative instrument is also reclassified from accumulated other comprehensive income (loss) and recognized in earnings.

Fair Value of Financial Instruments

Fair Value of Financial Instruments    Under the accounting for fair value measurements and disclosures, a fair value hierarchy was established that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The three levels of the fair value hierarchy are described below:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3 - Inputs that are both significant to the fair value measurement and unobservable.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements  In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-09, Compensation – Stock Compensation (Topic 718) Improvements to Employee Share-Based Payment Accounting designed to simplify certain aspects of accounting for share-based awards. The new ASU requires entities to recognize as a component of income tax expense all excess tax benefits or deficiencies arising from the difference between compensation costs recognized and the intrinsic value at the time an option is exercised or, in the case of restricted stock and similar awards, the fair value upon vesting of an award. Previously such differences were recognized in additional paid in capital as part of an “APIC pool.” The ASU also requires entities to exclude excess tax benefits and tax deficiencies from the calculation of common share equivalents for purposes of calculating earnings per share. In addition, as permitted by the ASU, we have elected to account for the impact of forfeitures as they occur rather to estimate forfeitures for purposes of recognizing compensation expense. We adopted this standard effective January 1, 2017, on a prospective basis; however, the adoption of the new standard did not have a material impact on our reported results of operations or financial position.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers which clarifies the principles for recognizing revenue and develops a common revenue standard for GAAP and International Financial Reporting Standards. The new standard is required to be adopted retrospectively for fiscal years beginning after December 15, 2017. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. Substantially all of our revenue is earned pursuant to contracts under which we have one performance obligation that is satisfied at a point-in-time. We have completed our review of our contracts and have determined this ASU will not have an impact on the timing or amount of revenue recognition, our results of operations or our financial position. We have elected to use the modified retrospective method of adoption.

In March 2017, the FASB issued ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). The update requires entities to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. All other components are to be presented below the determination of operating income. Entities will be required to disclose the line(s) used to present the other components of net periodic benefit cost, if the components are not presented separately in the income statement. ASU 2017-07 is effective for fiscal years and interim periods beginning after December 15, 2017, and early adoption is permitted. We will adopt this standard beginning with first quarter 2018 financial statements and all previously presented consolidated statements of income will be represented to reflect the reclassification and will result in a reduction of operating income of $2.7 million in 2017 and an increase of $3.4 million for 2016. Such amounts will be reclassified to “Non-operating income (expense).”

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). This ASU will require organizations such as us that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The new guidance will be effective for annual periods beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We are in the process of assessing the impact this standard will have on us and expect to follow a modified retrospective method provided for under the standard.

In August 2017, the FASB issued ASU 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities" (“ASU 2017-12”), which simplifies the application of hedge accounting and more closely aligns hedge accounting with an entity’s risk management strategies. ASU 2017-12 also amends the manner in which hedge effectiveness may be performed and changes the presentation of hedge ineffectiveness in the financial statements. ASU 2017-12 is effective for us beginning January 1, 2019, with early adoption permitted. ASU 2017-12 requires a cumulative-effect adjustment for certain items upon adoption. We are currently evaluating the impact the adoption of ASU 2017-12 will have on our consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments that changes the impairment model for most financial instruments, including trade receivables from an incurred loss method to a new forward-looking approach, based on expected losses. Under the new guidance, an allowance is recognized based on an estimate of expected credit losses. This standard is effective for us in the first quarter of 2020 and must be adopted using a modified retrospective transition approach. We are currently assessing the impact this standard may have on our results of operations and financial position.

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Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Range of Estimated Service Lives

The range of estimated service lives used to calculate financial reporting depreciation for principal items of plant and equipment are as follows:

Buildings	15 – 45 Years
Machinery and equipment	5 – 40 Years
Other	3 – 25 Years

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Energy and Related Sales, Net (Tables)

12 Months Ended

Dec. 31, 2017

Text Block [Abstract]

Summary of Energy and Related Sales Net

The following table summarizes this activity for each of the past three years:

	Year ended December 31
In thousands	2017			2016			2015
Energy sales	$	3,258		$	3,613		$	5,315
Costs to produce		(3,986	)		(3,972	)		(4,428	)
Net		(728	)		(359	)		887
Renewable energy credits		5,854			6,500			4,777
Total	$	5,126		$	6,141		$	5,664

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Gain on Dispositions of Plant, Equipment and Timberlands (Tables)

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Summary for Sale of Timberlands and Other Assets

During 2017, 2016 and 2015, we completed the following sales of assets:

Dollars in thousands	Acres		Proceeds		Gain (loss)
2017
Timberlands		332	$	209	$	188
Other	n/a			19		(214	)
Total			$	228	$	(26	)
2016
Timberlands		—	$	-	$	-
Other	n/a			70		(216	)
Total			$	70	$	(216	)
2015
Timberlands		15,628	$	23,917	$	20,867
Other	n/a		542		246
Total			$	24,459	$	21,113

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

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):

	Year ended December 31
In thousands, except per share		2017	2016		2015
Net income	$	7,914	$	21,554	$	64,575
Weighted average common shares    outstanding used in basic EPS		43,609		43,558		43,397
Common shares issuable upon    exercise of dilutive stock options    and PSAs / RSUs		830		571		545
Weighted average common shares    outstanding and common share    equivalents used in diluted EPS		44,439		44,129		43,942
Earnings per share
Basic	$	0.18	$	0.49	$	1.49
Diluted		0.18		0.49		1.47

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 the potential common shares outstanding for stock options that were not included in the computation of diluted EPS for the period indicated, because their effect would be anti-dilutive:

	Year ended December 31
In thousands	2017		2016		2015
Potential common shares		610		596		678

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Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

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 years ended December 31, 2017, 2016 and 2015.

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, 2017	$	(100,448	)	$	1,500		$	(110,656	)	$	4,998		$	(204,606	)
Other comprehensive income    before reclassifications  (net of tax)		58,609			(5,182	)		2,981			(1,099	)		55,309
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			(410	)		9,380			(348	)		8,622
Net current period other comprehensive    income (loss)		58,609			(5,592	)		12,361			(1,447	)		63,931
Balance at December 31, 2017	$	(41,839	)	$	(4,092	)	$	(98,295	)	$	3,551		$	(140,675	)
Balance at January 1, 2016	$	(73,041	)	$	(225	)	$	(120,714	)	$	3,494		$	(190,486	)
Other comprehensive income    before reclassifications  (net of tax)		(27,407	)		1,247			(4,334	)		2,086			(28,408	)
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			478			14,392			(582	)		14,288
Net current period other comprehensive    income (loss)		(27,407	)		1,725			10,058			1,504			(14,120	)
Balance at December 31, 2016	$	(100,448	)	$	1,500		$	(110,656	)	$	4,998		$	(204,606	)
Balance at January 1, 2015	$	(34,224	)	$	2,356		$	(120,260	)	$	(2,742	)	$	(154,870	)
Other comprehensive income    before reclassifications  (net of tax)		(38,817	)		1,620			(12,995	)		6,266			(43,926	)
Amounts reclassified from accumulated    other comprehensive income  (net of tax)		—			(4,201	)		12,541			(30	)		8,310
Net current period other comprehensive    income (loss)		(38,817	)		(2,581	)		(454	)		6,236			(35,616	)
Balance at December 31, 2015	$	(73,041	)	$	(225	)	$	(120,714	)	$	3,494		$	(190,486	)

Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income

The following table sets forth the amounts reclassified from accumulated other comprehensive income (losses) for the years indicated.

	Year ended December 31
In thousands	2017			2016			2015
Description										Line Item in Statements of Income
Cash flow hedges (Note 18)
(Gains) losses on cash flow hedges	$	(532	)	$	551		$	(5,752	)	Costs of products sold
Tax expense (benefit)		122			(73	)		1,551		Income tax provision (benefit)
Net of tax		(410	)		478			(4,201	)
Retirement plan obligations (Note 10)
Amortization of deferred benefit pension plan items
Prior service costs		2,122			2,026			2,300		Costs of products sold
		704			672			762		Selling, general and administrative
Actuarial losses		9,134			9,798			12,745		Costs of products sold
		3,145			3,373			4,388		Selling, general and administrative
Settlement recognition		—			7,306			—		Selling, general and administrative
		15,105			23,175			20,195
Tax expense (benefit)		(5,725	)		(8,783	)		(7,654	)	Income tax provision (benefit)
Net of tax		9,380			14,392			12,541
Amortization of deferred benefit other plan items
Prior service costs		(150	)		(150	)		(230	)	Costs of products sold
		(32	)		(32	)		(50	)	Selling, general and administrative
Actuarial losses		(311	)		(621	)		190		Costs of products sold
		(67	)		(134	)		41		Selling, general and administrative
		(560	)		(937	)		(49	)
Tax expense (benefit)		212			355			19		Income tax provision (benefit)
Net of tax		(348	)		(582	)		(30	)
Total reclassifications, net of tax	$	8,622		$	14,288		$	8,310

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Provision for Benefit from Income Taxes from Operations

The provision for (benefit from) income taxes from operations consisted of the following:

	Year ended December 31
In thousands	2017			2016			2015
Current taxes
Federal	$	(1,961	)	$	2,216		$	5,047
State		64			(1,112	)		(1,680	)
Foreign		14,292			10,203			12,536
		12,395			11,307			15,903
Deferred taxes and    other
Federal		11,662			(24,411	)		(7,287	)
State		3,388			(1,723	)		564
Foreign		3,976			4,079			4,821
		19,026			(22,055	)		(1,902	)
Income tax provision    (benefit)	$	31,421		$	(10,748	)	$	14,001

Schedule of Domestic and Foreign Components of Pretax Income (Loss) from Operations

The following are the domestic and foreign components of pretax income (loss) from operations:

	Year ended December 31
In thousands	2017			2016			2015
United States	$	(40,920	)	$	(63,315	)	$	2,382
Foreign		80,255			74,121			76,194
Total pretax income	$	39,335		$	10,806		$	78,576

Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate

A reconciliation between the income tax provision, computed by applying the statutory federal income tax rate of 35% to income before income taxes, and the actual income tax provision is as follows:

	Year ended December 31
	2017			2016			2015
Federal income tax    provision at statutory rate		35.0	%		35.0	%		35.0	%
State income taxes,    net of federal income tax    benefit		0.4			(15.0	)		0.3
Foreign income tax rate    differential		(28.7	)		(96.3	)		(8.6	)
Rate changes due to    enacted legislation		(0.6	)		(6.7	)		—
Tax effect of credits		(16.1	)		(30.3	)		(1.9	)
Provision for (resolution of ) tax matters		16.9			2.8			(2.1	)
State benefit due to enacted legislation		(4.1	)		—			—
Effect of U.S. tax law change (1)		53.2			—			—
Valuation allowance		23.3			7.1			0.4
Permanent differences on    non-U.S. earnings		—			—			(4.4	)
Other		0.6			3.9			(0.9	)
Actual tax rate		79.9	%		(99.5	)%		17.8	%

(1) Due to the TCJA which was enacted in December 2017, provisional mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. Our U.S. deferred tax assets and liabilities as of December 31, 2017 were re-measured from 35% to 21%.

The provisional effects of the TCJA are $39.0 million of deferred income tax expense, including a $6.8 million reversal of a valuation allowance, and $18.1 million of deferred income tax benefit for the year ended December 31, 2017.

Schedule of Deferred Tax Assets and Liabilities

The sources of deferred income taxes were as follows at December 31:

In thousands	2017			2016
Reserves	$	3,145		$	4,625
Environmental		11,189			20,868
Compensation		6,782			8,950
Post-retirement benefits		12,570			18,318
Research & development expenses		6,787			6,949
Inventories		1,891			1,464
Tax carryforwards		21,988			14,438
Other		2,106			993
Deferred tax assets		66,458			76,605
Valuation allowance		(7,405	)		(4,066	)
Net deferred tax assets		59,053			72,539
Property		(98,809	)		(81,837	)
Intangible assets		(17,647	)		(16,561	)
Pension		(21,941	)		(29,041	)
Other		(4,110	)		—
Deferred tax liabilities		(142,507	)		(127,439	)
Net deferred tax liabilities	$	(83,454	)	$	(54,900	)

Schedule of Non-Current Deferred Tax Assets and Liabilities Balance Sheet Captions

Non-current deferred tax assets and liabilities are included in the following balance sheet captions:

	December 31
In thousands	2017		2016
Other assets	$	117	$	95
Deferred income taxes		83,571		54,995

Schedule of Unrecognized Tax Benefit

A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows:

In millions	2017			2016			2015
Balance at January 1	$	14.2		$	12.2		$	14.9
Increases in tax positions    for prior years		1.7			2.0			0.0
Decreases in tax positions    for prior years		—			(1.4	)		(4.3	)
Increases in tax positions    for current year		11.9			1.9			1.9
Settlements		—			(0.2	)		0.0
Lapse in statutes of    limitation		(0.9	)		(0.3	)		(0.3	)
Balance at December 31	$	26.9		$	14.2		$	12.2

Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction

The following table summarizes tax years that remain subject to examination by major jurisdiction:

	Open Tax Years
Jurisdiction	Examinations not yet initiated	Examination in progress
United States
Federal	2014 - 2017	N/A
State	2013 - 2017	2014
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:

	As of or for the year ended December 31,
In millions	2017		2016			2015
Accrued interest payable	$	0.8	$	0.5		$	0.6
Interest expense (income)		0.3		(0.1	)	–
Penalties	–		–			–

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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 the past three years:

Units	2017			2016			2015
Balance at January 1,		679,038			674,523			888,942
Granted		375,435			302,722			164,666
Forfeited		(96,306	)		(148,232	)		(92,183	)
Shares delivered		(28,781	)		(149,975	)		(286,902	)
Balance at December 31,		929,386			679,038			674,523

Compensation Expense for Stock Option Activity

	2017		2016		2015
Compensation expense	$	4,843	$	3,154	$	1,758

Stock Only Stock Appreciation Rights (SOSARs) [Member]

Summary of Share Based Compensation Activity

The following table sets forth information related to outstanding SOSARS:

	2017					2016					2015
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		2,736,616		$	17.64		2,199,742		$	17.82		1,864,707		$	16.20
Granted		—			—		743,925			17.54		423,590		24.62
Exercised		(157,140	)		13.76		(61,190	)		10.70		(70,347	)		14.12
Canceled / forfeited		(17,630	)		18.46		(145,861	)		22.80		(18,208	)		25.41
Outstanding at December 31,		2,561,846		$	17.87		2,736,616		$	17.64		2,199,742		$	17.82
Exercisable at December 31,		2,011,075			17.56		1,740,591		16.19			1,504,599			14.48
Vested and expected to vest		2,561,846					2,725,611					2,178,708
SOSAR Grants
Weighted average grant date    fair value per share		—				$	4.07				$	7.46
Aggregate grant date    fair value (in thousands)		—				$	3,013				$	3,134
Black-Scholes assumptions
Dividend yield		—					2.85	%				1.94	%
Risk free rate of return		—					1.34	%				1.64	%
Volatility		—					31.97	%				36.38	%
Expected life		—				6					6
Compensation expense    (in thousands)	$	1,371				$	2,735				$	2,645

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Retirement Plans and Other Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Compensation And Retirement Disclosure [Abstract]

Schedule of Change in Benefit Obligation and Plan Assets

Claims are paid as reported.

	Pension Benefits						Other Benefits
In millions	2017			2016			2017			2016
Change in    Benefit    Obligation
Balance at    beginning of    year	$	552.0		$	541.9		$	47.9		$	51.0
Service cost		10.7			10.5			1.2			1.1
Interest cost		23.8			24.5			2.0			2.0
Plan amendments		4.1			5.5			—			—
Participant    contributions		—			—			1.1			1.0
Actuarial    (gain)/loss		45.5			17.0			1.5			(3.4	)
Benefits paid		(36.5	)		(22.9	)		(3.0	)		(3.8	)
One-time settlement		—			(24.2	)		—			—
Effect of currency    rate changes		1.2			(0.3	)		—			—
Balance at end    of year	$	600.8		$	552.0		$	50.7		$	47.9
Change in    Plan Assets
Fair value of plan    assets at    beginning of year	$	610.7		$	594.9		$	—		$	—
Actual return    on plan assets		96.8			60.8			—			—
Total contributions		2.1			2.1			3.0			3.8
Benefits paid		(36.5	)		(22.9	)		(3.0	)		(3.8	)
One-time settlement		—			(24.2	)		—			—
Fair value of plan    assets at end    of year	$	673.1			610.7			—			—
Funded status at    end of year	$	72.3		$	58.7		$	(50.7	)	$	(47.9	)

Summary of Amounts Recognized in Consolidated Balance Sheets

In 2016, we recorded a pension settlement charge of $7.3 million and settled $24.2 million of benefits in connection with a voluntary program offered to deferred vested terminated participants.

Amounts recognized in the consolidated balance sheets consist of the following as of December 31:

	Pension Benefits						Other Benefits
In millions	2017			2016			2017			2016
Other assets	$	115.5		$	96.7		$	—		$	—
Current liabilities		(2.2	)		(2.0	)		(3.5	)		(3.2	)
Other long-term    liabilities		(41.0	)		(36.0	)		(47.2	)		(44.7	)
Net amount    recognized	$	72.3		$	58.7		$	(50.7	)	$	(47.9	)

Components of Amounts Recognized as Accumulated Other Comprehensive Income on Pre-Tax Basis

The components of amounts recognized as “Accumulated other comprehensive income” consist of the following on a pre-tax basis:

	Pension Benefits				Other Benefits
In millions	2017		2016		2017			2016
Prior service    cost/(credit)	$	16.1	$	14.8	$	(0.5	)	$	(0.6	)
Net actuarial loss		145.6		165.9		(5.6	)		(7.4	)

Weighted-Average Assumptions Used in Computing Benefit Obligations

The weighted-average assumptions used in computing the benefit obligations above were as follows:

	Pension Benefits						Other Benefits
	2017			2016			2017			2016
Discount rate –    benefit    obligation		3.85	%		4.43	%		3.68	%		4.18	%
Future    compensation    growth rate		3.00			3.00			—			—

Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets

Information for pension plans with an accumulated benefit obligation in excess of plan assets was as follows:

In millions	2017		2016
Projected benefit obligation	$	43.1	$	37.9
Accumulated benefit    obligation		38.6		34.6
Fair value of plan assets		—		—

Schedule of Net Periodic Benefit Cost of Pension and Other Benefits

Net periodic benefit cost includes the following components:

	Year Ended December 31
In millions	2017			2016			2015
Pension Benefits
Service cost	$	10.7		$	10.5		$	11.6
Interest cost		23.8			24.5			23.3
Expected return on plan    assets		(43.0	)		(45.4	)		(46.0	)
Amortization of prior    service cost		2.8			2.7			3.1
Amortization of    actuarial loss		12.3			13.2			17.1
One-time settlement    charge		—			7.3			—
Total net periodic benefit cost	$	6.6		$	12.8		$	9.1
Other Benefits
Service cost	$	1.2		$	1.1		$	1.4
Interest cost		2.0			2.0			2.0
Amortization of prior    service cost/(credit)		(0.2	)		(0.2	)		(0.3	)
Amortization of    actuarial loss		(0.4	)		(0.8	)		0.2
Total net periodic    benefit cost	$	2.6		$	2.1		$	3.3

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)

Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) were as follows:

	Year Ended December 31
In millions	2017			2016
Pension Benefits
Actuarial (gain) loss	$	(8.3	)	$	1.4
Plan amendments		4.1			5.5
Recognized prior service cost		(2.8	)		(2.7	)
Recognized actuarial losses		(12.3	)		(20.5	)
Total recognized in other    comprehensive loss		(19.3	)		(16.3	)
Total recognized in net periodic    benefit cost and other    comprehensive loss	$	(12.7	)	$	(3.5	)
Other Benefits
Actuarial (gain) loss	$	1.5		$	(3.4	)
Amortization of prior service cost		0.2			0.2
Amortization of actuarial losses		0.4			0.8
Total recognized in other    comprehensive (income) loss		2.1			(2.4	)
Total recognized in net periodic    benefit cost and other    comprehensive (income) loss	$	4.7		$	(0.3	)

Schedule of Defined Benefit Plan Weighted-Average Assumptions Used in Computing Net Periodic Benefit Cost

The weighted-average assumptions used in computing the net periodic benefit cost information above were as follows:

	Year Ended December 31
	2017			2016			2015
Pension Benefits
Discount rate – benefit expense		4.43	%		4.65	%		4.21	%
Future compensation growth rate		3.00			3.50			4.00
Expected long-term rate of return    on plan assets		7.25			7.75			8.00
Other Benefits
Discount rate – benefit expense		4.18	%		4.38	%		3.89	%

Schedule of Health Care Cost Trend Rates Used in Calculating Benefit Obligations

Assumed health care cost trend rates used to determine benefit obligations at December 31 were as follows:

	2017			2016
Health care cost trend rate    assumed for next year		6.20	%		6.50	%
Rate to which the cost    trend rate is assumed to    decline (the ultimate trend rate)		4.50			4.50
Year that the rate reaches    the ultimate rate	2037			2037

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects:

	One Percentage Point
In millions	Increase		Decrease
Effect on:
Post-retirement benefit obligation	$	3.9	$	(3.5	)
Total of service and interest    cost components		0.3		(0.3	)

Schedule of Targeted Range of Investment Allocations of Plan Assets

Risk is minimized by diversification by asset class, by style of each manager and by sector and industry limits when applicable. The targeted range of investment allocations of Plan assets is as follows:

	Range
Domestic Equity		35	%	-		45	%
International equity	8			-	14
Real Estate Investment     Trusts (REIT)	2			-	6
Fixed income, cash    and cash equivalents	55			-	35

Schedule of Fair Value of Benefit Plan Assets

The table below presents the fair values of our benefit plan assets by level within the fair value hierarchy, as described in Note 2:

	December 31, 2017
In millions	Total		Level 1		Level 2		Level 3
Domestic Equity
Large cap	$	214.9	$	12.4	$	202.5	$	—
Small and mid    cap		46.2		46.2		—		—
International    equity		81.4		7.2		74.2		—
REIT		27.6		27.6		—		—
Fixed income		290.9		24.0		266.9		—
Cash and    equivalents		12.1		0.1		12.0		—
Total	$	673.1	$	117.5	$	555.6	$	—

	December 31, 2016
In millions	Total		Level 1		Level 2		Level 3
Domestic Equity
Large cap	$	201.9	$	7.1	$	194.8	$	—
Small and mid    cap		50.9		50.9		—		—
International    equity		79.5		38.8		40.7		—
REIT		27.9		27.9		—		—
Fixed income		237.7		28.5		209.2		—
Cash and    equivalents		12.8		—		12.8		—
Total	$	610.7	$	153.2	$	457.5	$	—

Benefit Payments Expected to be Made under Non-Qualified Pension Plans and Other Benefit Plans

Benefit payments expected to be made in 2018 under our non-qualified pension plans and other benefit plans are summarized below:

In thousands
Nonqualified pension plans	$	2,160
Other benefit plans		3,500

Summary of Benefit Expected to be Paid Out

The following benefit payments under all pension and other benefit plans, and giving effect to expected future service, as appropriate, are expected to be paid:

In thousands	Pension Benefits		Other Benefits
2018	$	41,106	$	3,500
2019		39,993		4,129
2020		39,468		4,500
2021		39,375		4,663
2022		39,041		4,620
2023 through 2027		188,907		21,053

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Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories, Net of Reserves

Inventories, net of reserves were as follows:

	December 31
In thousands		2017		2016
Raw materials	$	60,806	$	66,359
In-process and finished		116,678		112,507
Supplies		74,580		70,803
Total	$	252,064	$	249,669

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Plant, Equipment and Timberlands (Tables)

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Summary of Plant, Equipment and Timberlands

Plant, equipment and timberlands at December 31 were as follows:

In thousands		2017			2016
Land and buildings	$	221,436		$	192,877
Machinery and equipment		1,484,545			1,335,669
Furniture, fixtures, and other		174,462			142,110
Accumulated depreciation		(1,125,203	)		(1,036,825	)
		755,240			633,831
Construction in progress		105,673			137,665
Timberlands, less depletion		4,830			4,402
Total	$	865,743		$	775,898

Summary of Interest Expense Capitalized

The following table sets forth amounts of interest expense capitalized in connection with major capital projects:

	Year Ended December 31
	2017		2016		2015
Interest cost incurred	$	19,852	$	17,431	$	17,815
Interest capitalized		2,080		1,609		351
Interest expense	$	17,772	$	15,822	$	17,464

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Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

The following table sets forth information with respect to goodwill and other intangible assets:

	December 31
In thousands		2017			2016
Goodwill – Composite Fibers	$	82,744		$	73,094
Specialty Papers
Customer relationships	$	6,155		$	6,155
Composite Fibers
Tradename		4,773			4,195
Technology and related		40,686			35,874
Customer relationships and related		36,705			32,310
Advanced Airlaid Materials
Technology and related		1,488			1,377
Customer relationships and related		3,001			2,638
Total intangibles		92,808			82,549
Accumulated amortization		(33,949	)		(26,290	)
Net intangibles	$	58,859		$	56,259

Summary of Amortization of Intangible Assets

amortized over periods ranging from 14 years to 20 years. The following table sets forth information pertaining to amortization of intangible assets:

In thousands			2017		2016		2015
Aggregate amortization    expense:		$	4,773	$	4,852	$	5,340
Estimated amortization    expense:
	2018		4,773
	2019		4,773
	2020		4,639
	2021		4,254
	2022		4,139

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Other Long-Term Assets (Tables)

12 Months Ended

Dec. 31, 2017

Other Assets Noncurrent [Abstract]

Summary of Other Long-Term Assets

Other long-term assets consist of the following:

	December 31
In thousands		2017		2016
Pension	$	115,482	$	96,699
Other		22,996		25,050
Total	$	138,478	$	121,749

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Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Other Liabilities Disclosure [Abstract]

Summary of Other Current Liabilities

Other current liabilities consist of the following:

	December 31
In thousands		2017		2016
Accrued payroll and benefits	$	39,375	$	48,306
Other accrued compensation    and retirement benefits		7,864		6,828
Income taxes payable		1,927		211
Accrued rebates		16,126		14,329
Other accrued expenses		45,930		49,576
Total	$	111,222	$	119,250

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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Long-Term Debt

Long-term debt is summarized as follows:

	December 31
In thousands		2017			2016
Revolving credit facility, due Mar. 2020	$	171,200		$	61,595
5.375% Notes, due Oct. 2020		250,000			250,000
2.40% Term Loan, due Jun. 2022		7,710			8,282
2.05% Term Loan, due Mar. 2023		33,607			35,163
1.30% Term Loan, due Jun. 2023		9,423			9,788
1.55% Term Loan, due Sep. 2025		11,390			10,333
Total long-term debt		483,330			375,161
Less current portion		(11,298	)		(8,961	)
Unamortized deferred issuance costs		(1,934	)		(2,553	)
Long-term debt, net of current portion	$	470,098		$	363,647

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

Amortization of Term Loan Agreements Together with Maturities of Other Long-term Debt

The following schedule sets forth the amortization of our term loan agreements together with the maturity of our other long-term debt during the indicated year.

In thousands
2018	$	11,298
2019		11,297
2020		432,497
2021		11,297
2022		10,441
Thereafter		6,500

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Carrying Value and Fair Value of Long-Term Debt

The following table sets forth the carrying value and fair value of long-term debt as of December 31:

	2017				2016
In thousands	Carrying Value		Fair Value		Carrying Value		Fair Value
Variable rate debt	$	171,200	$	171,200	$	61,595	$	61,595
Fixed-rate bonds		250,000		253,823		250,000		256,563
2.40% Term loan		7,710		7,889		8,282		8,877
2.05% Term loan		33,607		34,122		35,163		37,089
1.30% Term Loan		9,423		9,370		9,788		10,062
1.55% Term loan		11,390		11,320		10,333		10,082
Total	$	483,330	$	487,724	$	375,161	$	384,268

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Financial Derivatives and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2017

Fair Values of Derivative Instruments

Fair Value Measurements

The following table summarizes the fair values of derivative instruments as of December 31 for the year indicated and the line items in the accompanying consolidated balance sheets where the instruments are recorded:

	December 31				December 31
In thousands		2017		2016		2017		2016
	Prepaid Expenses and Other				Other Current
Balance sheet caption	Current Assets				Liabilities
Designated as    hedging:
Forward foreign    currency exchange    contracts	$	1,066	$	2,625	$	4,787	$	1,493
Not designated as    hedging:
Forward foreign    currency exchange    contracts	$	151	$	60	$	43	$	104

Income or (Loss) from Derivative Instruments Recognized in Results of Operations

The following table summarizes the amount of income or loss from derivative instruments recognized in our results of operations for the periods indicated and the line items in the accompanying consolidated statements of income where the results are recorded:

	Year ended December 31
In thousands	2017		2016			2015
Designated as    hedging:
Forward foreign    currency exchange    contracts:
Effective portion –    cost of products    sold	$	532	$	(551	)	$	5,752
Ineffective portion –    other – net		182		(166	)		(152	)
Not designated as    hedging:
Forward foreign    currency exchange    contracts:
Other – net	$	882	$	806		$	599

Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income

A rollforward of fair value amounts recorded as a component of accumulated other comprehensive income is as follows:

In thousands	2017			2016
Balance at January 1,	$	1,882		$	(178	)
Deferred (losses) gains    on cash flow hedges		(6,990	)		1,509
Reclassified to earnings		(532	)		551
Balance at December 31,	$	(5,640	)	$	1,882

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:

	December 31
In thousands		2017	2016
Derivative
Sell/Buy - sell notional
Philippine Peso / British Pound		19,047	—
Euro / British Pound		13,586	10,373
Euro / U.S. Dollar		1,048	—
U.S. Dollar / Euro		946	—
Sell/Buy - buy notional
Euro / Philippine Peso		890,096	699,279
British Pound / Philippine Peso		797,496	557,025
Euro / U.S. Dollar		60,519	43,951
U.S. Dollar / Canadian Dollar		32,265	35,290
British Pound / Euro		335	—
U.S. Dollar / Euro		4,253	15,379

Not Designated as Hedging [Member]

Outstanding Derivatives Used to Hedge Foreign Exchange Risks

	December 31
In thousands		2017	2016
Derivative
Sell/Buy -  sell notional
U.S. Dollar / Euro		—	—
U.S. Dollar / British Pound		17,500	10,500
Euro / British Pound		—	—
British Pound / Euro		1,000	2,500
Sell/Buy - buy notional
Euro / U.S. Dollar		4,500	3,500
British Pound / Euro		13,000	18,500

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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Outstanding Shares of Common Stock

The following table summarizes outstanding shares of common stock:

	Year ended December 31
In thousands	2017		2016		2015
Shares outstanding at    beginning of year		43,550		43,420		43,054
Treasury shares issued    for:
Restricted stock awards		28		108		206
401(k) plan		—		—		134
Employee stock options    exercised		36		22		26
Shares outstanding at end    of year		43,614		43,550		43,420

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Commitments, Contingencies and Legal Proceedings (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Summary of Minimum Annual Payment Due on Noncancelable Operating Lease

The following table summarizes the minimum annual payments due on noncancelable operating leases and other similar contractual obligations having initial or remaining terms in excess of one year:

In thousands	Leases		Other
2018	$	12,683	$	115,710
2019		5,926		31,415
2020		4,393		18,674
2021		3,276		1,705
2022		2,932		4
Thereafter		8,431		1

Schedule of Reserves

Reserves for the Site. Our reserve for all remaining claims against us relating to PCB contamination is set forth below:

	Year ended December 31
In thousands		2017			2016
Balance at January 1,	$	52,788		$	17,105
Payments		(9,644	)		(4,317	)
Accruals		-			40,000
Balance at December 31,	$	43,144		$	52,788

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Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Financial and Other Information by Business Unit

The following tables set forth profitability and other information by business unit:

For the year ended December 31, 2017	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	544.3	$	256.1	$	790.9	$	—		$	1,591.3
Energy and related sales, net		—		—		5.1		—			5.1
Total revenue		544.3		256.1		796.0		—			1,596.4
Cost of products sold		437.6		216.7		734.2		15.4			1,403.9
Gross profit		106.7		39.4		61.8		(15.4	)		192.5
SG&A		44.4		9.3		46.4		34.3			134.4
Loss on dispositions of plant, equipment    and timberlands, net		—		—		—		—			—
Total operating income (loss)		62.3		30.1		15.4		(49.7	)		58.1
Non-operating expense		—		—		—		(18.8	)		(18.8	)
Income (loss) before income taxes	$	62.3	$	30.1	$	15.4	$	(68.5	)	$	39.3
Supplementary Data
Plant, equipment and timberlands, net	$	254.0	$	235.6	$	360.5	$	15.6		$	865.7
Depreciation, depletion and amortization		28.3		9.6		30.8		7.3			76.0
Capital expenditures		15.9		50.6		51.5		14.3			132.3

For the year ended December 31, 2016	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	517.0	$	244.3	$	843.6	$	—		$	1,604.8
Energy and related sales, net		—		—		6.1		—			6.1
Total revenue		517.0		244.3		849.7		—			1,610.9
Cost of products sold		416.4		209.5		752.6		13.9			1,392.3
Gross profit		100.6		34.8		97.1		(13.9	)		218.7
SG&A		46.3		8.4		55.9		80.1			190.7
Gains on dispositions of plant, equipment    and timberlands, net		—		—		—		0.2			0.2
Total operating income (loss)		54.3		26.4		41.2		(94.2	)		27.8
Non-operating expense		—		—		—		(16.9	)		(16.9	)
Income (loss) before income taxes	$	54.3	$	26.4	$	41.2	$	(111.1	)	$	10.9
Supplementary Data
Plant, equipment and timberlands, net	$	235.1	$	179.3	$	352.9	$	8.6		$	775.9
Depreciation, depletion and amortization		27.8		9.0		26.3		2.7			65.8
Capital expenditures		18.8		36.8		99.0		5.6			160.2

For the year ended December 31, 2015	Composite		Advanced Airlaid		Specialty		Other and
In millions	Fibers		Materials		Papers		Unallocated			Total
Net sales	$	541.5	$	244.6	$	875.0	$	—		$	1,661.1
Energy and related sales, net		—		—		5.7		—			5.7
Total revenue		541.5		244.6		880.7		—			1,666.8
Cost of products sold		434.4		215.7		804.5		9.2			1,463.8
Gross profit		107.1		28.9		76.2		(9.2	)		203.0
SG&A		45.7		7.6		43.3		31.0			127.7
Gains on dispositions of plant, equipment    and timberlands, net		—		—		—		(21.1	)		(21.1	)
Total operating income (loss)		61.4		21.3		32.9		(19.1	)		96.4
Non-operating expense		—		—		—		(17.8	)		(17.8	)
Income (loss) before income taxes	$	61.4	$	21.3	$	32.9	$	(36.9	)	$	78.6
Supplementary Data
Plant, equipment and timberlands, net	$	258.1	$	153.5	$	282.0	$	5.7		$	698.9
Depreciation, depletion and amortization		26.2		8.8		26.0		2.2			63.2
Capital expenditures		26.8		7.8		63.5		1.8			99.9

Schedule of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands

Our net sales to external customers and location of net plant, equipment and timberlands are summarized below. Net sales are attributed to countries based upon origin of shipment.

	2017				2016				2015
In thousands	Net sales		Plant, Equipment and Timberlands – Net		Net sales		Plant, Equipment and Timberlands – Net		Net sales		Plant, Equipment and Timberlands – Net
United States	$	880,708	$	456,223	$	918,567	$	391,977	$	959,730	$	287,447
Germany		450,668		240,932		427,520		220,380		444,009		232,340
United Kingdom		76,594		55,495		78,759		51,903		86,442		62,931
Canada		120,434		78,220		115,902		79,727		118,568		81,201
Other		62,893		34,873		64,049		31,911		52,335		34,945
Total	$	1,591,297	$	865,743	$	1,604,797	$	775,898	$	1,661,084	$	698,864

Composite Fibers [Member]

Schedule of Segment Reporting Information of Revenue by Segment

Composite Fibers’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Food & beverage	$	268,474	$	258,463	$	274,865
Wallcovering		103,011		90,767		91,620
Technical specialties and    other		76,991		71,558		71,689
Composite laminates		38,696		35,107		34,897
Metallized		57,088		61,059		68,397
Total	$	544,260	$	516,954	$	541,468

Advanced Airlaid Materials [Member]

Schedule of Segment Reporting Information of Revenue by Segment

Advanced Airlaid Materials’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Feminine hygiene	$	179,670	$	173,902	$	182,048
Specialty wipes		29,519		25,206		22,950
Adult incontinence		14,425		12,281		10,720
Home care		13,029		12,630		13,345
Other		19,458		20,243		15,526
Total	$	256,101	$	244,262	$	244,589

Specialty Papers [Member]

Schedule of Segment Reporting Information of Revenue by Segment

Specialty Papers’ revenue composition by market consisted of the following for the years indicated:

In thousands	2017		2016		2015
Carbonless & forms	$	292,071	$	319,648	$	349,831
Engineered products		189,930		189,463		190,943
Envelope & converting		154,291		173,362		178,067
Book publishing		152,576		157,541		152,647
Other		2,067		3,568		3,538
Total	$	790,935	$	843,582	$	875,026

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Condensed Consolidating Financial Statements (Tables)

12 Months Ended

Dec. 31, 2017

Condensed Financial Information Of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Statement of Income

Condensed Consolidating Statement of Income for the

year ended December 31, 2017

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	790,933		$	89,787		$	798,603		$	(88,026	)	$	1,591,297
Energy and related sales, net		5,126			—			—			—			5,126
Total revenues		796,059			89,787			798,603			(88,026	)		1,596,423
Costs of products sold		747,736			85,196			659,007			(88,026	)		1,403,913
Gross profit		48,323			4,591			139,596			—			192,510
Selling, general and administrative
expenses		69,483			2,598			62,313			—			134,394
(Gain) loss on dispositions of plant
equipment and timberlands, net		223			(188	)		(9	)		—			26
Operating income (loss)		(21,383	)		2,181			77,292			—			58,090
Other non-operating
income (expense)
Interest expense		(20,394	)		(971	)		(1,801	)		5,394			(17,772	)
Interest income		599			4,947			85			(5,394	)		237
Equity in earnings of subsidiaries		18,864			60,871			—			(79,735	)		—
Other, net		2,241			(6,776	)		3,315			—			(1,220	)
Total other non-operating
income (expense)		1,310			58,071			1,599			(79,735	)		(18,755	)
Income (loss) before income taxes		(20,073	)		60,252			78,891			(79,735	)		39,335
Income tax provision (benefit)		(27,987	)		41,388			18,020			—			31,421
Net income		7,914			18,864			60,871			(79,735	)		7,914
Other comprehensive income		63,931			52,290			51,828			(104,118	)		63,931
Comprehensive income	$	71,845		$	71,154		$	112,699		$	(183,853	)	$	71,845

Condensed Consolidating Statement of Income for the

year ended December 31, 2016

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	843,582		$	75,000		$	755,860		$	(69,645	)	$	1,604,797
Energy and related sales, net		6,141			—			—			—			6,141
Total revenues		849,723			75,000			755,860			(69,645	)		1,610,938
Costs of products sold		763,109			70,991			627,880			(69,645	)		1,392,335
Gross profit		86,614			4,009			127,980			—			218,603
Selling, general and administrative
expenses		133,387			(156	)		57,463			—			190,694
Loss on dispositions of plant
equipment and timberlands, net		177			—			39			—			216
Operating income (loss)		(46,950	)		4,165			70,478			—			27,693
Other non-operating
income (expense)
Interest expense		(17,436	)		(41	)		(3,060	)		4,715			(15,822	)
Interest income		687			4,177			57			(4,715	)		206
Equity in earnings of subsidiaries		61,007			58,347			—			(119,354	)		—
Other, net		(2,312	)		(3,966	)		5,007			—			(1,271	)
Total other non-operating
income (expense)		41,946			58,517			2,004			(119,354	)		(16,887	)
Income (loss) before income taxes		(5,004	)		62,682			72,482			(119,354	)		10,806
Income tax provision (benefit)		(26,558	)		1,675			14,135			—			(10,748	)
Net income		21,554			61,007			58,347			(119,354	)		21,554
Other comprehensive loss		(14,120	)		(25,916	)		(25,176	)		51,092			(14,120	)
Comprehensive income	$	7,434		$	35,091		$	33,171		$	(68,262	)	$	7,434

Condensed Consolidating Statement of Income for the

year ended December 31, 2015

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net sales	$	875,026		$	84,704		$	779,380		$	(78,026	)	$	1,661,084
Energy and related sales, net		5,664			—			—			—			5,664
Total revenues		880,690			84,704			779,380			(78,026	)		1,666,748
Costs of products sold		811,329			80,455			650,025			(78,026	)		1,463,783
Gross profit		69,361			4,249			129,355			—			202,965
Selling, general and administrative
expenses		71,751			821			55,134			—			127,706
Gain on dispositions of plant
equipment and timberlands, net		(19,720	)		(1,183	)		(210	)		—			(21,113	)
Operating income		17,330			4,611			74,431			—			96,372
Other non-operating
income (expense)
Interest expense		(18,147	)		—			(36,859	)		37,542			(17,464	)
Interest income		673			37,127			26			(37,543	)		283
Equity in earnings of subsidiaries		61,946			24,737			—			(86,683	)		—
Other, net		(3,389	)		(1,471	)		4,245			—			(615	)
Total other non-operating
income (expense)		41,083			60,393			(32,588	)		(86,684	)		(17,796	)
Income before income taxes		58,413			65,004			41,843			(86,684	)		78,576
Income tax provision (benefit)		(6,162	)		2,922			17,241			—			14,001
Net income		64,575			62,082			24,602			(86,684	)		64,575
Other comprehensive income (loss)		(35,616	)		(41,010	)		29,680			11,330			(35,616	)
Comprehensive income	$	28,959		$	21,072		$	54,282		$	(75,354	)	$	28,959

Condensed Consolidating Balance Sheet

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 Balance Sheet as of December 31, 2016

In thousands	Parent Company		Guarantors			Non Guarantors		Adjustments/ Eliminations			Consolidated
Assets
Cash and cash equivalents	$	5,082	$	1,461		$	48,901	$	—		$	55,444
Other current assets		206,002		256,289			242,187		(265,663	)		438,815
Plant, equipment and timberlands, net		360,521		31,455			383,922		—			775,898
Investments in subsidiaries		789,565		540,029			—		(1,329,594	)		—
Other assets		123,010		—			128,092		—			251,102
Total assets	$	1,484,180	$	829,234		$	803,102	$	(1,595,257	)	$	1,521,259
Liabilities and Shareholders' Equity
Current liabilities	$	426,628	$	26,085		$	135,961	$	(265,663	)	$	323,011
Long-term debt		283,686		14,000			65,961		—			363,647
Deferred income taxes		10,221		(729	)		45,503		—			54,995
Other long-term liabilities		109,819		313			15,648		—			125,780
Total liabilities		830,354		39,669			263,073		(265,663	)		867,433
Shareholders’ equity		653,826		789,565			540,029		(1,329,594	)		653,826
Total liabilities and shareholders’ equity	$	1,484,180	$	829,234		$	803,102	$	(1,595,257	)	$	1,521,259

Condensed Consolidating Statement of Cash Flows

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2017

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	(4,259	)	$	(3,506	)	$	112,027		$	—		$	104,262
Investing activities
Expenditures for purchases of plant, equipment and timberlands		(65,822	)		(45,644	)		(20,838	)		—			(132,304	)
Proceeds from disposals of plant, equipment and timberlands, net		11			209			8			—			228
Repayments from intercompany loans		—			12,000			—			(12,000	)		—
Advances of intercompany loans		—			(14,400	)		—			14,400			—
Intercompany capital contributed		(14,000	)		(400	)		—			14,400			—
Acquisitions, net of cash acquired		—			—			—			—			—
Other		(243	)		—			—			—			(243	)
Total investing activities		(80,054	)		(48,235	)		(20,830	)		16,800			(132,319	)
Financing activities
Net long-term borrowings		84,200			37,000			(21,535	)		—			99,665
Payment of dividends to shareholders		(22,480	)		—			—			—			(22,480	)
Repayments of intercompany loans		—			—			(12,000	)		12,000			—
Borrowings of intercompany loans		14,400			—			—			(14,400	)		—
Intercompany capital received		—			14,000			400			(14,400	)		—
Proceeds from government grants		4,875			—			—			—			4,875
Payments related to share-based compensation awards and other		(472	)		—			—			—			(472	)
Total financing activities		80,523			51,000			(33,135	)		(16,800	)		81,588
Effect of exchange rate on cash		—			—			7,244			—			7,244
Net increase (decrease) in cash		(3,790	)		(741	)		65,306			—			60,775
Cash at the beginning of period		5,082			1,461			48,901			—			55,444
Cash at the end of period	$	1,292		$	720		$	114,207		$	—		$	116,219

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2016

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	33,109		$	1,275		$	81,726		$	—		$	116,110
Investing activities
Expenditures for purchases of plant, equipment and timberlands		(104,595	)		(30,682	)		(24,881	)		—			(160,158	)
Proceeds from disposals of plant, equipment and timberlands, net		41			—			29			—			70
Repayments from intercompany loans		—			15,601			—			(15,601	)		—
Advances of intercompany loans		—			(18,330	)		—			18,330			—
Intercompany capital (contributed) returned		(17,000	)		(500	)		—			17,500			—
Other		(800	)		—			—			—			(800	)
Total investing activities		(122,354	)		(33,911	)		(24,852	)		20,229			(160,888	)
Financing activities
Net repayments of indebtedness		36,000			14,000			(35,886	)		—			14,114
Payments of borrowing costs		(136	)		—			—			—			(136	)
Payment of dividends to shareholders		(21,589	)		—			—			—			(21,589	)
Repayments of intercompany loans		—			—			(15,601	)		15,601			—
Borrowings of intercompany loans		18,330			—			—			(18,330	)		—
Intercompany capital (returned) received		—			17,000			500			(17,500	)		—
Payment of intercompany dividend		—			632			(632	)		—			—
Proceeds from government grants		3,582			2,000			—			—			5,582
Payments related to share-based compensation awards and other		(990	)		—			—			—			(990	)
Total financing activities		35,197			33,632			(51,619	)		(20,229	)		(3,019	)
Effect of exchange rate on cash		—			—			(2,063	)		—			(2,063	)
Net increase (decrease) in cash		(54,048	)		996			3,192			—			(49,860	)
Cash at the beginning of period		59,130			465			45,709			—			105,304
Cash at the end of period	$	5,082		$	1,461		$	48,901		$	—		$	55,444

Condensed Consolidating Statement of Cash Flows for the year

ended December 31, 2015

In thousands	Parent Company			Guarantors			Non Guarantors			Adjustments/ Eliminations			Consolidated
Net cash provided (used) by
Operating activities	$	34,391		$	627		$	98,725		$	—		$	133,743
Investing activities
Expenditures for plant, equipment and timberlands		(65,265	)		(109	)		(34,515	)		—			(99,889	)
Proceeds from disposal plant, equipment and timberlands, net		22,741			1,213			505			—			24,459
Repayments from intercompany loans		—			57,855			—			(57,855	)		—
Advances of intercompany loans		—			(49,230	)		—			49,230			—
Intercompany capital contributed, net		10,100			(300	)		—			(9,800	)		—
Acquisitions, net of cash acquired		—			—			(224	)		—			(224	)
Other		(1,600	)		—			—			—			(1,600	)
Total investing activities		(34,024	)		9,429			(34,234	)		(18,425	)		(77,254	)
Financing activities
Net proceeds from indebtedness		—			—			(24,650	)		—			(24,650	)
Payments of note offering costs		(1,329	)		—			—			—			(1,329	)
Payment of dividends to shareholders		(20,443	)		—			—			—			(20,443	)
Repayments of intercompany loans		(9,158	)		—			(48,697	)		57,855			—
Borrowings of intercompany loans		49,230			—			—			(49,230	)		—
Intercompany capital (returned) received		—			(10,100	)		300			9,800			—
Proceeds from government grants		421			—			—			—			421
Payments related to share-based compensation awards and other		(2,166	)		—			151			—			(2,015	)
Total financing activities		16,555			(10,100	)		(72,896	)		18,425			(48,016	)
Effect of exchange rate on cash		—			—			(3,006	)		—			(3,006	)
Net increase (decrease) in cash		16,922			(44	)		(11,411	)		—			5,467
Cash at the beginning of period		42,208			509			57,120			—			99,837
Cash at the end of period	$	59,130		$	465		$	45,709		$	—		$	105,304

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Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Net Income (Loss) and Earnings (Loss) Per Share

															Earnings (loss)
In thousands,	Net sales				Gross profit				Net income (loss)						per share
except per share	2017		2016		2017		2016		2017			2016			2017			2016
First	$	390,713	$	402,218	$	56,929	$	57,843	$	11,603		$	16,168		$	0.26		$	0.37
Second		387,342		406,413		30,436		42,723		(5,714	)		1,965			(0.13	)		0.04
Third		413,325		405,301		54,735		61,170		12,105			19,601			0.27			0.44
Fourth		399,917		390,865		50,410		56,867		(10,080	)		(16,180	)		(0.23	)		(0.37	)

XML

Accounting Policies - Schedule of Range of Estimated Service Lives (Detail)	12 Months Ended
	Dec. 31, 2017
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	15 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	5 years
Minimum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	3 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	45 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	40 years
Maximum [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Range of estimated service lives	25 years

XML

Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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	$ (2.7)	$ 3.4

XML

Energy and Related Sales, Net - Summary of Energy and Related Sales Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Energy And Related Sales Net [Abstract]
Energy sales	$ 3,258	$ 3,613	$ 5,315
Costs to produce	(3,986)	(3,972)	(4,428)
Net	(728)	(359)	887
Renewable energy credits	5,854	6,500	4,777
Total	$ 5,126	$ 6,141	$ 5,664

XML

Gain on Dispositions of Plant, Equipment and Timberlands - Summary for Sale of Timberlands and Other Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) a	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) a
Property, Plant and Equipment [Line Items]
Proceeds	$ 228	$ 70	$ 24,459
Gain (loss)	$ (26)	(216)	$ 21,113
Timberlands [Member]
Property, Plant and Equipment [Line Items]
Acres | a	332		15,628
Proceeds	$ 209		$ 23,917
Gain (loss)	188		20,867
Other [Member]
Property, Plant and Equipment [Line Items]
Proceeds	19	70	542
Gain (loss)	$ (214)	$ (216)	$ 246

XML

Asset Impairment Charges - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Non-cash asset impairment charge			$ 1,200,000
Dresden Papier GmbH [Member] | Tradename [Member]
Indefinite-lived Intangible Assets [Line Items]
Non-cash asset impairment charge	$ 0	$ 0	$ 1,200,000

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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 7,914	$ 21,554	$ 64,575
Weighted average common shares outstanding used in basic EPS	43,609	43,558	43,397
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	830	571	545
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,439	44,129	43,942
Earnings per share
Basic	$ 0.18	$ 0.49	$ 1.49
Diluted	$ 0.18	$ 0.49	$ 1.47

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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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Potential common shares	610	596	678

XML

Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (204,606)	$ (190,486)	$ (154,870)
Other comprehensive income before reclassifications (net of tax)	55,309	(28,408)	(43,926)
Amounts reclassified from accumulated other comprehensive income (net of tax)	8,622	14,288	8,310
Net current period other comprehensive income (loss)	63,931	(14,120)	(35,616)
Ending Balance	(140,675)	(204,606)	(190,486)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(100,448)	(73,041)	(34,224)
Other comprehensive income before reclassifications (net of tax)	58,609	(27,407)	(38,817)
Net current period other comprehensive income (loss)	58,609	(27,407)	(38,817)
Ending Balance	(41,839)	(100,448)	(73,041)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,500	(225)	2,356
Other comprehensive income before reclassifications (net of tax)	(5,182)	1,247	1,620
Amounts reclassified from accumulated other comprehensive income (net of tax)	(410)	478	(4,201)
Net current period other comprehensive income (loss)	(5,592)	1,725	(2,581)
Ending Balance	(4,092)	1,500	(225)
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(110,656)	(120,714)	(120,260)
Other comprehensive income before reclassifications (net of tax)	2,981	(4,334)	(12,995)
Amounts reclassified from accumulated other comprehensive income (net of tax)	9,380	14,392	12,541
Net current period other comprehensive income (loss)	12,361	10,058	(454)
Ending Balance	(98,295)	(110,656)	(120,714)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,998	3,494	(2,742)
Other comprehensive income before reclassifications (net of tax)	(1,099)	2,086	6,266
Amounts reclassified from accumulated other comprehensive income (net of tax)	(348)	(582)	(30)
Net current period other comprehensive income (loss)	(1,447)	1,504	6,236
Ending Balance	$ 3,551	$ 4,998	$ 3,494

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Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	$ (1,403,913)	$ (1,392,335)	$ (1,463,783)
Selling, general and administrative	(134,394)	(190,694)	(127,706)
Income tax provision (benefit)	(31,421)	10,748	(14,001)
Net income	7,914	21,554	64,575
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Net income	8,622	14,288	8,310
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs and Expenses	15,105	23,175	20,195
Income tax provision (benefit)	(5,725)	(8,783)	(7,654)
Net income	9,380	14,392	12,541
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	2,122	2,026	2,300
Selling, general and administrative	704	672	762
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	9,134	9,798	12,745
Selling, general and administrative	3,145	3,373	4,388
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Settlement Recognition [Member]
Defined Benefit Plan Disclosure [Line Items]
Selling, general and administrative		7,306
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs and Expenses	(560)	(937)	(49)
Income tax provision (benefit)	212	355	19
Net income	(348)	(582)	(30)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member] | Prior Service Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	(150)	(150)	(230)
Selling, general and administrative	(32)	(32)	(50)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member] | Actuarial Losses [Member]
Defined Benefit Plan Disclosure [Line Items]
Costs of products sold	(311)	(621)	190
Selling, general and administrative	(67)	(134)	41
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	(532)	551	(5,752)
Income tax provision (benefit)	122	(73)	1,551
Net income	$ (410)	$ 478	$ (4,201)

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Federal income tax rate		35.00%	35.00%	35.00%
Tax cuts and jobs act of 2017, change in tax rate, income tax expense (benefit)		$ (18,100)
Tax cuts and jobs act of 2017, change in tax rate, deferred income tax expense		39,000
Tax cuts and jobs act of 2017, reversal of valuation allowance		6,800
Tax cuts and jobs act of 2017, change in tax rate, deferred income tax benefit		18,100
Valuation allowances		7,405	$ 4,066
Research and development, tax credit		6,300	1,100	$ 1,500
Undistributed earnings of foreign subsidiaries		397,800
Gross unrecognized tax benefits		26,900	$ 14,200	$ 12,200	$ 14,900
Unrecognized tax benefits that would impact effective tax rate		16,800
Minimum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months		0
Maximum [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months		600
United States - Federal [Member]
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense		41,800
Net operating loss carryforwards		$ 47,900
Net operating loss carryforwards expiration year		2037
Tax credit carryforwards		$ 9,100
Tax credit carryforwards expiration year		2035
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense		$ 3,800
Net operating loss carryforwards		$ 3,700
Net operating loss carryforwards expiration year		2023
Tax credit carryforwards		$ 2,400
Tax credit carryforwards expiration year		2027
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense		$ 300
Net operating loss carryforwards		188,400
Tax credit carryforwards		$ 200
Tax credit carryforwards expiration year		2018
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration year		2018
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards expiration year		2037
Scenario Forcast [Member]
Income Tax Contingency [Line Items]
Federal income tax rate	21.00%

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Income Taxes - Schedule of Provision for Benefit from Income Taxes from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current taxes
Federal	$ (1,961)	$ 2,216	$ 5,047
State	64	(1,112)	(1,680)
Foreign	14,292	10,203	12,536
Total current taxes	12,395	11,307	15,903
Deferred taxes and other
Federal	11,662	(24,411)	(7,287)
State	3,388	(1,723)	564
Foreign	3,976	4,079	4,821
Total deferred taxes and other	19,026	(22,055)	(1,902)
Income tax provision (benefit)	$ 31,421	$ (10,748)	$ 14,001

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Income Taxes - Schedule of Domestic and Foreign Components of Pretax Income (Loss) from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ (40,920)	$ (63,315)	$ 2,382
Foreign	80,255	74,121	76,194
Income before income taxes	$ 39,335	$ 10,806	$ 78,576

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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Detail)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal income tax provision at statutory rate		35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit		0.40%	(15.00%)	0.30%
Foreign income tax rate differential		(28.70%)	(96.30%)	(8.60%)
Rate changes due to enacted legislation		(0.60%)	(6.70%)
Tax effect of credits		(16.10%)	(30.30%)	(1.90%)
Provision for (resolution of ) tax matters		16.90%	2.80%	(2.10%)
State benefit due to enacted legislation		(4.10%)
Effect of U.S. tax law change	[1]	53.20%
Valuation allowance		23.30%	7.10%	0.40%
Permanent differences on non-U.S. earnings				(4.40%)
Other		0.60%	3.90%	(0.90%)
Actual tax rate		79.90%	(99.50%)	17.80%

[1] Due to the TCJA which was enacted in December 2017, provisional mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. Our U.S. deferred tax assets and liabilities as of December 31, 2017 were re-measured from 35% to 21%.

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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Federal income tax provision at statutory rate		35.00%	35.00%	35.00%
Scenario Forcast [Member]
Income Tax Contingency [Line Items]
Federal income tax provision at statutory rate	21.00%

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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Reserves	$ 3,145	$ 4,625
Environmental	11,189	20,868
Compensation	6,782	8,950
Post-retirement benefits	12,570	18,318
Research & development expenses	6,787	6,949
Inventories	1,891	1,464
Tax carryforwards	21,988	14,438
Other	2,106	993
Deferred tax assets	66,458	76,605
Valuation allowance	(7,405)	(4,066)
Net deferred tax assets	59,053	72,539
Property	(98,809)	(81,837)
Intangible assets	(17,647)	(16,561)
Pension	(21,941)	(29,041)
Other	(4,110)
Deferred tax liabilities	(142,507)	(127,439)
Net deferred tax liabilities	$ (83,454)	$ (54,900)

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Income Taxes - Schedule of Non-Current Deferred Tax Assets and Liabilities Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Other assets	$ 117	$ 95
Deferred income taxes	$ 83,571	$ 54,995

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Income Taxes - Schedule of Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Beginning balance	$ 14.2	$ 12.2	$ 14.9
Increases in tax positions for prior years	1.7	2.0	0.0
Decreases in tax positions for prior years		(1.4)	(4.3)
Increases in tax positions for current year	11.9	1.9	1.9
Settlements		(0.2)	0.0
Lapse in statutes of limitation	(0.9)	(0.3)	(0.3)
Ending balance	$ 26.9	$ 14.2	$ 12.2

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Income Taxes - Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction (Detail)	12 Months Ended
	Dec. 31, 2017
United States - Federal [Member] | Minimum [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2014
United States - Federal [Member] | Maximum [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
State and Local Jurisdiction [Member] | Minimum [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2012
Examination in progress	2013
State and Local Jurisdiction [Member] | Maximum [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Examination in progress	2014
Foreign Tax Authority [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Foreign Tax Authority [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Foreign Tax Authority [Member] | Minimum [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2010
Examination in progress	2014
Foreign Tax Authority [Member] | Minimum [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examination in progress	2012
Foreign Tax Authority [Member] | Minimum [Member] | France [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2014
Examination in progress	2011
Foreign Tax Authority [Member] | Minimum [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2015
Foreign Tax Authority [Member] | Minimum [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2015
Foreign Tax Authority [Member] | Maximum [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013
Examination in progress	2015
Foreign Tax Authority [Member] | Maximum [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examination in progress	2015
Foreign Tax Authority [Member] | Maximum [Member] | France [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Examination in progress	2012
Foreign Tax Authority [Member] | Maximum [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016
Foreign Tax Authority [Member] | Maximum [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2016

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Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Accrued interest payable	$ 0.8	$ 0.5	$ 0.6
Interest expense (income)	$ 0.3	$ (0.1)

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Units (RSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The vesting graded scale	The vesting of RSUs is generally based on the passage of time, generally on a graded scale over a three, four, and five-year period.
Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under performance share awards	163,274	199,693	105,017
Weighted average grant date fair value	$ 22.32	$ 18.08	$ 24.62
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants under performance share awards	375,435	302,722	164,666
Unrecognized compensation expense for outstanding RSUs and PSAs	$ 6.7
The weighted average remaining period over which the expense will be recognized	1 year 10 months 24 days
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of stock	3 years
Granted	0	743,925	423,590
Intrinsic value of SOSARs vested and expected to vest	$ 12.4
The remaining weighted average contractual life of outstanding SOSARs	5 years 2 months 12 days
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future issuance	2,188,572

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Stock-Based Compensation - Summary of RSU and PSA Activity (Detail) - Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member] - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	679,038	674,523	888,942
Granted	375,435	302,722	164,666
Forfeited	(96,306)	(148,232)	(92,183)
Shares delivered	(28,781)	(149,975)	(286,902)
Ending Balance	929,386	679,038	674,523

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Stock-Based Compensation - Compensation Expense for Periods (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,843	$ 3,154	$ 1,758

XML

Stock-Based Compensation - Schedule of Information Related to Outstanding SOSARS (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised	(36,000)	(22,000)	(26,000)
Stock Only Stock Appreciation Rights (SOSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Outstanding	2,736,616	2,199,742	1,864,707
Granted	0	743,925	423,590
Exercised	(157,140)	(61,190)	(70,347)
Canceled / forfeited	(17,630)	(145,861)	(18,208)
Ending Balance, Outstanding	2,561,846	2,736,616	2,199,742
Exercisable at December 31	2,011,075	1,740,591	1,504,599
Vested and expected to vest	2,561,846	2,725,611	2,178,708
Beginning Balance, Weighted Average Exercise Price, Outstanding	$ 17.64	$ 17.82	$ 16.20
Weighted Average Exercise Price, Granted		17.54	24.62
Weighted Average Exercise Price, Exercised	13.76	10.70	14.12
Weighted Average Exercise Price, Canceled / forfeited	18.46	22.80	25.41
Ending Balance, Weighted Average Exercise Price, Outstanding	17.87	17.64	17.82
Weighted Average Exercise Price, Exercisable at December 31,	$ 17.56	16.19	14.48
Weighted average grant date fair value per share		$ 4.07	$ 7.46
Aggregate grant date fair value		$ 3,013	$ 3,134
Black-Scholes assumptions
Dividend yield		2.85%	1.94%
Risk free rate of return		1.34%	1.64%
Volatility		31.97%	36.38%
Expected life		6 years	6 years
Compensation expense	$ 1,371	$ 2,735	$ 2,645

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Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Age	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan retired union employees eligible age to participate in health care benefit plan | Age	55
Defined benefit plan retired union employees eligible service period	5 years
Accumulated benefit obligation for all defined benefit pension plans	$ 584.3	$ 537.6
Defined contribution plans Employees contribution	50.00%
Expense associated with Defined Contribution Plans	$ 2.3	2.0	$ 2.1
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge		7.3
Pension settlement charge settled		$ 24.2
Discount rates	3.85%	4.43%
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	$ 3.1
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	$ 0.2
Pension Benefits [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	1.90%
Pension Benefits [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.55%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.68%	4.18%
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss)		$ 13.5
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss)		$ 0.3
Other Benefits [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.02%
Other Benefits [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.21%

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Retirement Plans and Other Post-Retirement Benefits - Schedule of Change in Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 610.7
Fair value of plan assets at end of year	673.1	$ 610.7
Pension Benefits [Member]
Change in Benefit Obligation
Balance at beginning of year	552.0	541.9
Service cost	10.7	10.5	$ 11.6
Interest cost	23.8	24.5	23.3
Plan amendments	4.1	5.5
Actuarial (gain)/loss	45.5	17.0
Benefits paid	(36.5)	(22.9)
One-time settlement		(24.2)
Effect of currency rate changes	1.2	(0.3)
Balance at end of year	600.8	552.0	541.9
Change in Plan Assets
Fair value of plan assets at beginning of year	610.7	594.9
Actual return on plan assets	96.8	60.8
Total contributions	2.1	2.1
Benefits paid	(36.5)	(22.9)
One-time settlement		(24.2)
Fair value of plan assets at end of year	673.1	610.7	594.9
Funded status at end of year	72.3	58.7
Other Benefits [Member]
Change in Benefit Obligation
Balance at beginning of year	47.9	51.0
Service cost	1.2	1.1	1.4
Interest cost	2.0	2.0	2.0
Participant contributions	1.1	1.0
Actuarial (gain)/loss	1.5	(3.4)
Benefits paid	(3.0)	(3.8)
Balance at end of year	50.7	47.9	$ 51.0
Change in Plan Assets
Total contributions	3.0	3.8
Benefits paid	(3.0)	(3.8)
Funded status at end of year	$ (50.7)	$ (47.9)

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Retirement Plans and Other Post-Retirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ 72.3	$ 58.7
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(50.7)	(47.9)
Other Assets [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	115.5	96.7
Current Liabilities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(2.2)	(2.0)
Current Liabilities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(3.5)	(3.2)
Other Long-Term Liabilities [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(41.0)	(36.0)
Other Long-Term Liabilities [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ (47.2)	$ (44.7)

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Retirement Plans and Other Post-Retirement Benefits - Components of Amounts Recognized as Accumulated Other Comprehensive Income on Pre-Tax Basis (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost/(credit)	$ 16.1	$ 14.8
Net actuarial loss	145.6	165.9
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost/(credit)	(0.5)	(0.6)
Net actuarial loss	$ (5.6)	$ (7.4)

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Retirement Plans and Other Post-Retirement Benefits - Weighted-Average Assumptions Used in Computing Benefit Obligations (Detail)	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit obligation	3.85%	4.43%
Future compensation growth rate	3.00%	3.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit obligation	3.68%	4.18%

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Retirement Plans and Other Post-Retirement Benefits - Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	$ 43.1	$ 37.9
Accumulated benefit obligation	$ 38.6	$ 34.6

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Retirement Plans and Other Post-Retirement Benefits - Schedule of Net Periodic Benefit Cost of Pension and Other Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10.7	$ 10.5	$ 11.6
Interest cost	23.8	24.5	23.3
Expected return on plan assets	(43.0)	(45.4)	(46.0)
Amortization of prior service cost/(credit)	2.8	2.7	3.1
Amortization of actuarial loss	12.3	13.2	17.1
One-time settlement charge		7.3
Total net periodic benefit cost	6.6	12.8	9.1
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.2	1.1	1.4
Interest cost	2.0	2.0	2.0
Amortization of prior service cost/(credit)	(0.2)	(0.2)	(0.3)
Amortization of actuarial loss	(0.4)	(0.8)	0.2
Total net periodic benefit cost	$ 2.6	$ 2.1	$ 3.3

XML

Retirement Plans and Other Post-Retirement Benefits - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ (8.3)	$ 1.4
Plan amendments	4.1	5.5
Recognized prior service cost	(2.8)	(2.7)	$ (3.1)
Recognized actuarial losses	(12.3)	(20.5)
Total recognized in other comprehensive (income) loss	(19.3)	(16.3)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	(12.7)	(3.5)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	1.5	(3.4)
Recognized prior service cost	0.2	0.2	$ 0.3
Recognized actuarial losses	0.4	0.8
Total recognized in other comprehensive (income) loss	2.1	(2.4)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ 4.7	$ (0.3)

XML

Retirement Plans and Other Post-Retirement Benefits - Schedule of Defined Benefit Plan Weighted-Average Assumptions Used in Computing Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit expense	4.43%	4.65%	4.21%
Future compensation growth rate	3.00%	3.50%	4.00%
Expected long-term rate of return on plan assets	7.25%	7.75%	8.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate - benefit expense	4.18%	4.38%	3.89%

XML

Retirement Plans and Other Post-Retirement Benefits - Schedule of Health Care Cost Trend Rates Used in Calculating Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate assumed for next year	6.20%	6.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year that the rate reaches the ultimate rate	2037	2037

XML

Retirement Plans and Other Post-Retirement Benefits - Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Defined Benefit Plan Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates [Abstract]
Post-retirement benefit obligation, Increase	$ 3.9
Total of service and interest cost components, Increase	0.3
Post-retirement benefit obligation, Decrease	(3.5)
Total of service and interest cost components, Decrease	$ (0.3)

XML

Retirement Plans and Other Post-Retirement Benefits - Schedule of Targeted Range of Investment Allocations of Plan Assets (Detail)	Dec. 31, 2017
Domestic Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	35.00%
Domestic Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	45.00%
International Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	8.00%
International Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	14.00%
Real Estate Investment Trusts (REIT) [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	2.00%
Real Estate Investment Trusts (REIT) [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	6.00%
Fixed Income, Cash and Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	55.00%
Fixed Income, Cash and Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	35.00%

XML

Retirement Plans and Other Post-Retirement Benefits - Schedule of Fair Value of Benefit Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 673.1	$ 610.7
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	117.5	153.2
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	555.6	457.5
Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	214.9	201.9
Large Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	7.1
Large Cap [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	202.5	194.8
Small and Mid Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.2	50.9
Small and Mid Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.2	50.9
International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81.4	79.5
International Equity [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.2	38.8
International Equity [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74.2	40.7
Real Estate Investment Trusts (REIT) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27.6	27.9
Real Estate Investment Trusts (REIT) [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27.6	27.9
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290.9	237.7
Fixed Income [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.0	28.5
Fixed Income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	266.9	209.2
Cash and Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.1	12.8
Cash and Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.1
Cash and Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 12.0	$ 12.8

XML

Retirement Plans and Other Post-Retirement Benefits - Benefit Payments Expected to be Made under Non-Qualified Pension Plans and Other Benefit Plans (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Nonqualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit payments expected	$ 2,160
Other Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit payments expected	$ 3,500

XML

Retirement Plans and Other Post-Retirement Benefits - Summary of Benefit Expected to be Paid Out (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	$ 41,106
2019	39,993
2020	39,468
2021	39,375
2022	39,041
2023 through 2027	188,907
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	3,500
2019	4,129
2020	4,500
2021	4,663
2022	4,620
2023 through 2027	$ 21,053

XML

Inventories - Inventories, Net of Reserves (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 60,806	$ 66,359
In-process and finished	116,678	112,507
Supplies	74,580	70,803
Total	$ 252,064	$ 249,669

XML

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventories using first-in, first-out method	$ 22.7	$ 21.3

XML

Plant, Equipment and Timberlands - Summary of Plant, Equipment and Timberlands (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (1,125,203)	$ (1,036,825)
Subtotal	755,240	633,831
Construction in progress	105,673	137,665
Timberlands, less depletion	4,830	4,402
Total	865,743	775,898	$ 698,864
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	221,436	192,877
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,484,545	1,335,669
Furniture, Fixtures, and Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 174,462	$ 142,110

XML

Plant, Equipment and Timberlands - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Accrued capital expenditures	$ 21.0	$ 24.3

XML

Plant, Equipment and Timberlands - Summary of Interest Expense Capitalized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Expense [Abstract]
Interest cost incurred	$ 19,852	$ 17,431	$ 17,815
Interest capitalized	2,080	1,609	351
Interest expense	$ 17,772	$ 15,822	$ 17,464

XML

Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill – Composite Fibers	$ 82,744	$ 73,094
Total intangibles	92,808	82,549
Accumulated amortization	(33,949)	(26,290)
Net intangibles	58,859	56,259
Specialty Papers [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	6,155	6,155
Composite Fibers [Member] | Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	4,773	4,195
Composite Fibers [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	40,686	35,874
Composite Fibers [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	36,705	32,310
Advanced Airlaid Materials [Member] | Technology and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	1,488	1,377
Advanced Airlaid Materials [Member] | Customer Relationships and Related [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangibles	$ 3,001	$ 2,638

XML

Goodwill and Intangible Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	12 years 2 months 12 days
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	14 years
Technology and Related [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	14 years
Technology and Related [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	20 years

XML

Goodwill and Intangible Assets - Summary of Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]
Aggregate amortization expense:	$ 4,773	$ 4,852	$ 5,340
2018	4,773
2019	4,773
2020	4,639
2021	4,254
2022	$ 4,139

XML

Other Long-Term Assets - Summary of Other Long-Term Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets Noncurrent [Abstract]
Pension	$ 115,482	$ 96,699
Other	22,996	25,050
Total	$ 138,478	$ 121,749

XML

Other Current Liabilities - Summary of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Current [Abstract]
Accrued payroll and benefits	$ 39,375	$ 48,306
Other accrued compensation and retirement benefits	7,864	6,828
Income taxes payable	1,927	211
Accrued rebates	16,126	14,329
Other accrued expenses	45,930	49,576
Total	$ 111,222	$ 119,250

XML

Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 483,330	$ 375,161
Less current portion	(11,298)	(8,961)
Unamortized deferred issuance costs	(1,934)	(2,553)
Long-term debt, net of current portion	470,098	363,647
Revolving Credit Facility, Due Mar. 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	171,200	61,595
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	7,710	8,282
2.05% Term Loan, Due Mar. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	33,607	35,163
1.30% Term Loan, Due Jun. 2023 [Member]
Debt Instrument [Line Items]
Total long-term debt	9,423	9,788
1.55% Term Loan, Due Sep. 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 11,390	$ 10,333

XML

Long-Term Debt - Summary of Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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

XML

Long-Term Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	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	2.5
Amortization expense related to deferred debt issuance costs	$ 1,200,000
Other Assets [Member]
Debt Instrument [Line Items]
Unamortized deferred debt issuance costs	$ 3,000,000
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	$ 5,100,000
Letters of credit outstanding	$ 0

XML

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

XML

Long-Term Debt - Amortization of Term Loan Agreements Together with Maturities of Other Long-term Debt (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Maturities Of Long Term Debt [Abstract]
2018	$ 11,298
2019	11,297
2020	432,497
2021	11,297
2022	10,441
Thereafter	$ 6,500

XML

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 483,330	$ 375,161
Fair Value	487,724	384,268
Revolving Credit Facility Due Mar. 2020 And Nov. 2016 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	171,200	61,595
Fair Value	171,200	61,595
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	253,823	256,563
2.40% Term Loan, Due Jun. 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	7,710	8,282
Fair Value	7,889	8,877
2.05% Term Loan, Due Mar. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	33,607	35,163
Fair Value	34,122	37,089
1.30% Term Loan, Due Jun. 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	9,423	9,788
Fair Value	9,370	10,062
1.55% Term Loan, Due Sep. 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	11,390	10,333
Fair Value	$ 11,320	$ 10,082

XML

Fair Value of Financial Instruments - Carrying Value and Fair Value of Long-Term Debt (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016
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%

XML

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amount of fixed rate debt	$ 470,098	$ 363,647
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%

XML

Financial Derivatives and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
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] | Foreign Exchange [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts	18 months
Designated as Hedging [Member] | Cash Flow Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Period of production costs expected to be incurred	18 months
Not Designated as Hedging [Member]
Derivative [Line Items]
Maturities of foreign currency derivative contracts	1 month

XML

Financial Derivatives and Hedging Activities - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Detail)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 PHP	Dec. 31, 2017 CAD	Dec. 31, 2017 GBP (£)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 PHP	Dec. 31, 2016 CAD	Dec. 31, 2016 GBP (£)
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 | PHP			PHP 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		€ 13,586,000					€ 10,373,000
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 | $	$ 60,519,000					$ 43,951,000
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 | PHP			890,096,000					PHP 699,279,000
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 | $	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		4,253,000					15,379,000
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 | PHP			PHP 797,496,000					PHP 557,025,000
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 | CAD				CAD 32,265,000					CAD 35,290,000
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 | $	4,500,000					3,500,000
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					£ 2,500,000
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		€ 13,000,000					€ 18,500,000
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 | $	$ 17,500,000					$ 10,500,000

XML

Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	$ 1,066	$ 2,625
Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	4,787	1,493
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative asset, fair value	151	60
Not Designated as Hedging [Member] | Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liability, fair value	$ 43	$ 104

XML

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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Costs of Products Sold [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Effective portion of derivative instruments, gain (loss)	$ 532	$ (551)	$ 5,752
Other - Net [Member] | Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Ineffective portion of derivative instruments, gain (loss)	182	(166)	(152)
Other - Net [Member] | Not Designated as Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative instruments, gain (loss)	$ 882	$ 806	$ 599

XML

Financial Derivatives and Hedging Activities - Fair Value Amounts Recorded as Component of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Balance at January 1,	$ 1,882	$ (178)
Deferred (losses) gains on cash flow hedges	(6,990)	1,509
Reclassified to earnings	(532)	551
Balance at December 31,	$ (5,640)	$ 1,882

XML

Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Shares outstanding at beginning of year	43,550	43,420	43,054
Treasury shares issued for:
Restricted stock awards	28	108	206
401(k) plan			134
Employee stock options exercised	36	22	26
Shares outstanding at end of year	43,614	43,550	43,420

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Commitments, Contingencies and Legal Proceedings - Summary of Minimum Annual Payment Due on Noncancelable Operating Lease (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Leases [Member]
Operating Leased Assets [Line Items]
2018	$ 12,683
2019	5,926
2020	4,393
2021	3,276
2022	2,932
Thereafter	8,431
Other [Member]
Operating Leased Assets [Line Items]
2018	115,710
2019	31,415
2020	18,674
2021	1,705
2022	4
Thereafter	$ 1

XML

Commitments, Contingencies and Legal Proceedings - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) Operable_Unit	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitments Contingencies And Litigation [Line Items]
Annual payments due under operating leases	$ 37,600,000
Aggregate contractual obligation	$ 167,500,000
Number of operable units | Operable_Unit	5
Reserve for Environmental liabilities, current portion	$ 28,500,000	$ 25,000,000
Other Long-Term Liabilities [Member]
Commitments Contingencies And Litigation [Line Items]
Reserve for Environmental liabilities, remaining portion	14,600,000
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			$ 34,000,000
Unreimbursed costs			0
Unspent settlement money			4,000,000
NADAR [Member]
Commitments Contingencies And Litigation [Line Items]
Expected payments for governments unreimbursed past costs which are under dispute	104,000,000
Unspent settlement money	60,000,000
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 2019
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%

XML

Commitments, Contingencies and Legal Proceedings - Schedule of Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Environmental Remediation Obligations [Abstract]
Beginning balance	$ 52,788	$ 17,105
Payments	(9,644)	(4,317)
Accruals		40,000
Ending balance	$ 43,144	$ 52,788

XML

Segment and Geographic Information - Schedule of Financial and Other Information by Business Unit (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Energy and related sales, net									5,126	6,141	5,664
Total revenues									1,596,423	1,610,938	1,666,748
Cost of products sold									1,403,913	1,392,335	1,463,783
Gross profit	50,410	$ 54,735	$ 30,436	$ 56,929	56,867	$ 61,170	$ 42,723	$ 57,843	192,510	218,603	202,965
SG&A									134,394	190,694	127,706
(Gains) losses on dispositions of plant, equipment and timberlands, net									26	216	(21,113)
Operating income									58,090	27,693	96,372
Non-operating expense									(18,755)	(16,887)	(17,796)
Income before income taxes									39,335	10,806	78,576
Supplementary Data
Plant, equipment and timberlands, net	865,743				775,898				865,743	775,898	698,864
Depreciation, depletion and amortization									76,048	65,826	63,236
Capital expenditures									132,300	160,200	99,900
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales									544,260	516,954	541,468
Total revenues									544,300	517,000	541,500
Cost of products sold									437,600	416,400	434,400
Gross profit									106,700	100,600	107,100
SG&A									44,400	46,300	45,700
Operating income									62,300	54,300	61,400
Income before income taxes									62,300	54,300	61,400
Supplementary Data
Plant, equipment and timberlands, net	254,000				235,100				254,000	235,100	258,100
Depreciation, depletion and amortization									28,300	27,800	26,200
Capital expenditures									15,900	18,800	26,800
Advanced Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales									256,101	244,262	244,589
Total revenues									256,100	244,300	244,600
Cost of products sold									216,700	209,500	215,700
Gross profit									39,400	34,800	28,900
SG&A									9,300	8,400	7,600
Operating income									30,100	26,400	21,300
Income before income taxes									30,100	26,400	21,300
Supplementary Data
Plant, equipment and timberlands, net	235,600				179,300				235,600	179,300	153,500
Depreciation, depletion and amortization									9,600	9,000	8,800
Capital expenditures									50,600	36,800	7,800
Specialty Papers [Member]
Segment Reporting Information [Line Items]
Net sales									790,935	843,582	875,026
Energy and related sales, net									5,100	6,100	5,700
Total revenues									796,000	849,700	880,700
Cost of products sold									734,200	752,600	804,500
Gross profit									61,800	97,100	76,200
SG&A									46,400	55,900	43,300
Operating income									15,400	41,200	32,900
Income before income taxes									15,400	41,200	32,900
Supplementary Data
Plant, equipment and timberlands, net	360,500				352,900				360,500	352,900	282,000
Depreciation, depletion and amortization									30,800	26,300	26,000
Capital expenditures									51,500	99,000	63,500
Other and Unallocated [Member]
Segment Reporting Information [Line Items]
Cost of products sold									15,400	13,900	9,200
Gross profit									(15,400)	(13,900)	(9,200)
SG&A									34,300	80,100	31,000
(Gains) losses on dispositions of plant, equipment and timberlands, net										200	(21,100)
Operating income									(49,700)	(94,200)	(19,100)
Non-operating expense									(18,800)	(16,900)	(17,800)
Income before income taxes									(68,500)	(111,100)	(36,900)
Supplementary Data
Plant, equipment and timberlands, net	$ 15,600				$ 8,600				15,600	8,600	5,700
Depreciation, depletion and amortization									7,300	2,700	2,200
Capital expenditures									$ 14,300	$ 5,600	$ 1,800

XML

Segment and Geographic Information - Schedule of Segment Reporting Information of Revenue by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Composite Fibers [Member]
Segment Reporting Information [Line Items]
Net sales									544,260	516,954	541,468
Composite Fibers [Member] | Food & Beverage [Member]
Segment Reporting Information [Line Items]
Net sales									268,474	258,463	274,865
Composite Fibers [Member] | Wallcovering [Member]
Segment Reporting Information [Line Items]
Net sales									103,011	90,767	91,620
Composite Fibers [Member] | Metallized [Member]
Segment Reporting Information [Line Items]
Net sales									57,088	61,059	68,397
Composite Fibers [Member] | Composite Laminates [Member]
Segment Reporting Information [Line Items]
Net sales									38,696	35,107	34,897
Composite Fibers [Member] | Technical Specialties and Other [Member]
Segment Reporting Information [Line Items]
Net sales									76,991	71,558	71,689
Advanced Airlaid Materials [Member]
Segment Reporting Information [Line Items]
Net sales									256,101	244,262	244,589
Advanced Airlaid Materials [Member] | Feminine Hygiene [Member]
Segment Reporting Information [Line Items]
Net sales									179,670	173,902	182,048
Advanced Airlaid Materials [Member] | Specialty Wipes [Member]
Segment Reporting Information [Line Items]
Net sales									29,519	25,206	22,950
Advanced Airlaid Materials [Member] | Adult Incontinence [Member]
Segment Reporting Information [Line Items]
Net sales									14,425	12,281	10,720
Advanced Airlaid Materials [Member] | Home Care [Member]
Segment Reporting Information [Line Items]
Net sales									13,029	12,630	13,345
Advanced Airlaid Materials [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales									19,458	20,243	15,526
Specialty Papers [Member]
Segment Reporting Information [Line Items]
Net sales									790,935	843,582	875,026
Specialty Papers [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales									2,067	3,568	3,538
Specialty Papers [Member] | Carbonless & Forms [Member]
Segment Reporting Information [Line Items]
Net sales									292,071	319,648	349,831
Specialty Papers [Member] | Engineered Products [Member]
Segment Reporting Information [Line Items]
Net sales									189,930	189,463	190,943
Specialty Papers [Member] | Envelope & Converting [Member]
Segment Reporting Information [Line Items]
Net sales									154,291	173,362	178,067
Specialty Papers [Member] | Book Publishing [Member]
Segment Reporting Information [Line Items]
Net sales									$ 152,576	$ 157,541	$ 152,647

XML

Segment and Geographic Information - Additional Information (Detail) - Customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of customers accounting for percentage of net sales	0	0	0
Customers accounted for certain percentage in net sales	10.00%	10.00%	10.00%
Advanced Airlaid Materials [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of customers accounting for percentage of net sales	1	1	1

XML

Segment and Geographic Information - Schedule of Net Sales to External Customers and Location of Net Plant, Equipment and Timberlands (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Plant, Equipment and Timberlands – Net	865,743				775,898				865,743	775,898	698,864
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									880,708	918,567	959,730
Plant, Equipment and Timberlands – Net	456,223				391,977				456,223	391,977	287,447
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									450,668	427,520	444,009
Plant, Equipment and Timberlands – Net	240,932				220,380				240,932	220,380	232,340
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									76,594	78,759	86,442
Plant, Equipment and Timberlands – Net	55,495				51,903				55,495	51,903	62,931
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									120,434	115,902	118,568
Plant, Equipment and Timberlands – Net	78,220				79,727				78,220	79,727	81,201
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									62,893	64,049	52,335
Plant, Equipment and Timberlands – Net	$ 34,873				$ 31,911				$ 34,873	$ 31,911	$ 34,945

XML

Condensed Consolidating Financial Statements - Additional Information (Detail)	Dec. 31, 2017	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%

XML

Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Income Statements, Captions [Line Items]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Energy and related sales, net									5,126	6,141	5,664
Total revenues									1,596,423	1,610,938	1,666,748
Costs of products sold									1,403,913	1,392,335	1,463,783
Gross profit	$ 50,410	$ 54,735	$ 30,436	$ 56,929	$ 56,867	$ 61,170	$ 42,723	$ 57,843	192,510	218,603	202,965
Selling, general and administrative expenses									134,394	190,694	127,706
(Gains) losses on dispositions of plant, equipment and timberlands, net									26	216	(21,113)
Operating income									58,090	27,693	96,372
Other non-operating income (expense)
Interest expense									(17,772)	(15,822)	(17,464)
Interest income									237	206	283
Other, net									(1,220)	(1,271)	(615)
Total non-operating expense									(18,755)	(16,887)	(17,796)
Income before income taxes									39,335	10,806	78,576
Income tax provision (benefit)									31,421	(10,748)	14,001
Net income									7,914	21,554	64,575
Other comprehensive income (loss)									63,931	(14,120)	(35,616)
Comprehensive income									71,845	7,434	28,959
Adjustments/ Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales									(88,026)	(69,645)	(78,026)
Total revenues									(88,026)	(69,645)	(78,026)
Costs of products sold									(88,026)	(69,645)	(78,026)
Other non-operating income (expense)
Interest expense									5,394	4,715	37,542
Interest income									(5,394)	(4,715)	(37,543)
Equity in earnings of subsidiaries									(79,735)	(119,354)	(86,683)
Total non-operating expense									(79,735)	(119,354)	(86,684)
Income before income taxes									(79,735)	(119,354)	(86,684)
Net income									(79,735)	(119,354)	(86,684)
Other comprehensive income (loss)									(104,118)	51,092	11,330
Comprehensive income									(183,853)	(68,262)	(75,354)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Net sales									790,933	843,582	875,026
Energy and related sales, net									5,126	6,141	5,664
Total revenues									796,059	849,723	880,690
Costs of products sold									747,736	763,109	811,329
Gross profit									48,323	86,614	69,361
Selling, general and administrative expenses									69,483	133,387	71,751
(Gains) losses on dispositions of plant, equipment and timberlands, net									223	177	(19,720)
Operating income									(21,383)	(46,950)	17,330
Other non-operating income (expense)
Interest expense									(20,394)	(17,436)	(18,147)
Interest income									599	687	673
Equity in earnings of subsidiaries									18,864	61,007	61,946
Other, net									2,241	(2,312)	(3,389)
Total non-operating expense									1,310	41,946	41,083
Income before income taxes									(20,073)	(5,004)	58,413
Income tax provision (benefit)									(27,987)	(26,558)	(6,162)
Net income									7,914	21,554	64,575
Other comprehensive income (loss)									63,931	(14,120)	(35,616)
Comprehensive income									71,845	7,434	28,959
Guarantors [Member]
Condensed Income Statements, Captions [Line Items]
Net sales									89,787	75,000	84,704
Total revenues									89,787	75,000	84,704
Costs of products sold									85,196	70,991	80,455
Gross profit									4,591	4,009	4,249
Selling, general and administrative expenses									2,598	156	821
(Gains) losses on dispositions of plant, equipment and timberlands, net									(188)		(1,183)
Operating income									2,181	4,165	4,611
Other non-operating income (expense)
Interest expense									(971)	(41)
Interest income									4,947	4,177	37,127
Equity in earnings of subsidiaries									60,871	58,347	24,737
Other, net									(6,776)	(3,966)	(1,471)
Total non-operating expense									58,071	58,517	60,393
Income before income taxes									60,252	62,682	65,004
Income tax provision (benefit)									41,388	1,675	2,922
Net income									18,864	61,007	62,082
Other comprehensive income (loss)									52,290	(25,916)	(41,010)
Comprehensive income									71,154	35,091	21,072
Non Guarantors [Member]
Condensed Income Statements, Captions [Line Items]
Net sales									798,603	755,860	779,380
Total revenues									798,603	755,860	779,380
Costs of products sold									659,007	627,880	650,025
Gross profit									139,596	127,980	129,355
Selling, general and administrative expenses									62,313	57,463	55,134
(Gains) losses on dispositions of plant, equipment and timberlands, net									(9)	39	(210)
Operating income									77,292	70,478	74,431
Other non-operating income (expense)
Interest expense									(1,801)	(3,060)	(36,859)
Interest income									85	57	26
Other, net									3,315	5,007	4,245
Total non-operating expense									1,599	2,004	(32,588)
Income before income taxes									78,891	72,482	41,843
Income tax provision (benefit)									18,020	14,135	17,241
Net income									60,871	58,347	24,602
Other comprehensive income (loss)									51,828	(25,176)	29,680
Comprehensive income									$ 112,699	$ 33,171	$ 54,282

XML

Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 116,219	$ 55,444	$ 105,304	$ 99,837
Other current assets	468,752	438,815
Plant, equipment and timberlands, net	865,743	775,898	698,864
Other assets	280,081	251,102
Total assets	1,730,795	1,521,259
Liabilities and Shareholders' Equity
Current liabilities	347,176	323,011
Long-term debt	470,098	363,647
Deferred income taxes	83,571	54,995
Other long-term liabilities	121,022	125,780
Total liabilities	1,021,867	867,433
Shareholders' equity	708,928	653,826	663,247	649,109
Total liabilities and shareholders’ equity	1,730,795	1,521,259
Adjustments/ Eliminations [Member]
Assets
Other current assets	(277,989)	(265,663)
Investments in subsidiaries	(1,483,023)	(1,329,594)
Total assets	(1,761,012)	(1,595,257)
Liabilities and Shareholders' Equity
Current liabilities	(277,989)	(265,663)
Total liabilities	(277,989)	(265,663)
Shareholders' equity	(1,483,023)	(1,329,594)
Total liabilities and shareholders’ equity	(1,761,012)	(1,595,257)
Parent Company [Member]
Assets
Cash and cash equivalents	1,292	5,082	59,130	42,208
Other current assets	249,293	206,002
Plant, equipment and timberlands, net	375,231	360,521
Investments in subsidiaries	829,895	789,565
Other assets	139,552	123,010
Total assets	1,595,263	1,484,180
Liabilities and Shareholders' Equity
Current liabilities	402,787	426,628
Long-term debt	368,496	283,686
Deferred income taxes	14,081	10,221
Other long-term liabilities	100,971	109,819
Total liabilities	886,335	830,354
Shareholders' equity	708,928	653,826
Total liabilities and shareholders’ equity	1,595,263	1,484,180
Guarantors [Member]
Assets
Cash and cash equivalents	720	1,461	465	509
Other current assets	217,822	256,289
Plant, equipment and timberlands, net	80,992	31,455
Investments in subsidiaries	653,128	540,029
Total assets	952,662	829,234
Liabilities and Shareholders' Equity
Current liabilities	54,640	26,085
Long-term debt	51,000	14,000
Deferred income taxes	16,814	729
Other long-term liabilities	313	313
Total liabilities	122,767	39,669
Shareholders' equity	829,895	789,565
Total liabilities and shareholders’ equity	952,662	829,234
Non Guarantors [Member]
Assets
Cash and cash equivalents	114,207	48,901	$ 45,709	$ 57,120
Other current assets	279,626	242,187
Plant, equipment and timberlands, net	409,520	383,922
Other assets	140,529	128,092
Total assets	943,882	803,102
Liabilities and Shareholders' Equity
Current liabilities	167,738	135,961
Long-term debt	50,602	65,961
Deferred income taxes	52,676	45,503
Other long-term liabilities	19,738	15,648
Total liabilities	290,754	263,073
Shareholders' equity	653,128	540,029
Total liabilities and shareholders’ equity	$ 943,882	$ 803,102

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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 104,262	$ 116,110	$ 133,743
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(132,304)	(160,158)	(99,889)
Proceeds from disposals of plant, equipment and timberlands, net	228	70	24,459
Acquisition, net of cash acquired			(224)
Other	(243)	(800)	(1,600)
Net cash used by investing activities	(132,319)	(160,888)	(77,254)
Financing activities
Net long-term borrowings	99,665	14,114	(24,650)
Payments of borrowing costs		(136)	(1,329)
Payments of dividends	(22,480)	(21,589)	(20,443)
Proceeds from government grants	4,875	5,582	421
Payments related to share-based compensation awards and other	(472)	(990)	(2,015)
Net cash provided (used) by financing activities	81,588	(3,019)	(48,016)
Effect of exchange rate on cash	7,244	(2,063)	(3,006)
Net increase (decrease) in cash and cash equivalents	60,775	(49,860)	5,467
Cash and cash equivalents at the beginning of period	55,444	105,304	99,837
Cash and cash equivalents at the end of period	116,219	55,444	105,304
Adjustments/ Eliminations [Member]
Investing activities
Repayments from intercompany loans	(12,000)	(15,601)	(57,855)
Advances of intercompany loans	14,400	18,330	49,230
Intercompany capital (contributed) returned	14,400	17,500	(9,800)
Net cash used by investing activities	16,800	20,229	(18,425)
Financing activities
Repayments of intercompany loans	12,000	15,601	57,855
Borrowings of intercompany loans	(14,400)	(18,330)	(49,230)
Intercompany capital (returned) received	(14,400)	(17,500)	9,800
Net cash provided (used) by financing activities	(16,800)	(20,229)	18,425
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(4,259)	33,109	34,391
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(65,822)	(104,595)	(65,265)
Proceeds from disposals of plant, equipment and timberlands, net	11	41	22,741
Intercompany capital (contributed) returned	(14,000)	(17,000)	10,100
Other	(243)	(800)	(1,600)
Net cash used by investing activities	(80,054)	(122,354)	(34,024)
Financing activities
Net long-term borrowings	84,200	36,000
Payments of borrowing costs		(136)	(1,329)
Payments of dividends	(22,480)	(21,589)	(20,443)
Repayments of intercompany loans			(9,158)
Borrowings of intercompany loans	14,400	18,330	49,230
Proceeds from government grants	4,875	3,582	421
Payments related to share-based compensation awards and other	(472)	(990)	(2,166)
Net cash provided (used) by financing activities	80,523	35,197	16,555
Net increase (decrease) in cash and cash equivalents	(3,790)	(54,048)	16,922
Cash and cash equivalents at the beginning of period	5,082	59,130	42,208
Cash and cash equivalents at the end of period	1,292	5,082	59,130
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(3,506)	1,275	627
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(45,644)	(30,682)	(109)
Proceeds from disposals of plant, equipment and timberlands, net	209		1,213
Repayments from intercompany loans	12,000	15,601	57,855
Advances of intercompany loans	(14,400)	(18,330)	(49,230)
Intercompany capital (contributed) returned	(400)	(500)	(300)
Net cash used by investing activities	(48,235)	(33,911)	9,429
Financing activities
Net long-term borrowings	37,000	14,000
Intercompany capital (returned) received	14,000	17,000	(10,100)
Payment of intercompany dividend		632
Proceeds from government grants		2,000
Net cash provided (used) by financing activities	51,000	33,632	(10,100)
Net increase (decrease) in cash and cash equivalents	(741)	996	(44)
Cash and cash equivalents at the beginning of period	1,461	465	509
Cash and cash equivalents at the end of period	720	1,461	465
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	112,027	81,726	98,725
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(20,838)	(24,881)	(34,515)
Proceeds from disposals of plant, equipment and timberlands, net	8	29	505
Acquisition, net of cash acquired			(224)
Net cash used by investing activities	(20,830)	(24,852)	(34,234)
Financing activities
Net long-term borrowings	(21,535)	(35,886)	(24,650)
Repayments of intercompany loans	(12,000)	(15,601)	(48,697)
Intercompany capital (returned) received	400	500	300
Payment of intercompany dividend		(632)
Payments related to share-based compensation awards and other			151
Net cash provided (used) by financing activities	(33,135)	(51,619)	(72,896)
Effect of exchange rate on cash	7,244	(2,063)	(3,006)
Net increase (decrease) in cash and cash equivalents	65,306	3,192	(11,411)
Cash and cash equivalents at the beginning of period	48,901	45,709	57,120
Cash and cash equivalents at the end of period	$ 114,207	$ 48,901	$ 45,709

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Quarterly Results - Schedule of Net Income (Loss) and Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]
Net sales	$ 399,917	$ 413,325	$ 387,342	$ 390,713	$ 390,865	$ 405,301	$ 406,413	$ 402,218	$ 1,591,297	$ 1,604,797	$ 1,661,084
Gross profit	50,410	54,735	30,436	56,929	56,867	61,170	42,723	57,843	$ 192,510	$ 218,603	$ 202,965
Net income (loss)	$ (10,080)	$ 12,105	$ (5,714)	$ 11,603	$ (16,180)	$ 19,601	$ 1,965	$ 16,168
Earnings (loss) per share	$ (0.23)	$ 0.27	$ (0.13)	$ 0.26	$ (0.37)	$ 0.44	$ 0.04	$ 0.37

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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	$ 1,719	$ 2,239	$ 2,703
Provision	49	32	7
Write-offs, recoveries and discounts allowed	(29)	(497)	(275)
Other	218	(55)	(196)
Balance, end of year	1,957	1,719	2,239
Allowance for Sales Discounts and Deductions [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	1,462	1,593	1,809
Provision	4,610	4,283	3,856
Write-offs, recoveries and discounts allowed	(4,697)	(4,368)	(3,649)
Other	68	(46)	(423)
Balance, end of year	$ 1,443	$ 1,462	$ 1,593