Clearwater Paper (CLW) 10-K 21 Feb 18 2017 Q4 Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 16, 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	2,017
Document Fiscal Period Focus	Q4
Trading Symbol	CLW
Entity Registrant Name	CLEARWATER PAPER CORP
Entity Central Index Key	1,441,236
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		16,447,898
Entity Public Float			$ 755,547,040

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - 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
Income Statement [Abstract]
Net sales	$ 436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	$ 1,730,408	$ 1,734,763	$ 1,752,401
Costs and expenses:
Cost of sales	(375,277)	(386,581)	(380,733)	(387,030)	(368,524)	(396,605)	(361,851)	(368,647)	(1,529,621)	(1,495,627)	(1,512,849)
Selling, general and administrative expenses	(34,785)	(34,472)	(29,265)	(29,937)	(32,934)	(29,435)	(34,655)	(30,795)	(128,459)	(127,819)	(115,882)
Total operating costs and expenses	(410,062)	(421,053)	(409,998)	(416,967)	(401,458)	(426,040)	(396,506)	(399,442)	(1,658,080)	(1,623,446)	(1,628,731)
Income from operations	26,654	5,451	19,665	20,558	24,110	9,280	40,165	37,762	72,328	111,317	123,670
Interest expense, net									(31,374)	(30,651)	(31,182)
Earnings before income taxes									40,954	80,666	92,488
Income tax benefit (provision)									56,385	(31,112)	(36,505)
Net earnings	$ 80,924	$ 863	$ 8,037	$ 7,515	$ 9,343	$ 901	$ 20,864	$ 18,446	$ 97,339	$ 49,554	$ 55,983
Net earnings per common share:
Basic (in dollars per share)	$ 4.92	$ 0.05	$ 0.49	$ 0.46	$ 0.56	$ 0.05	$ 1.22	$ 1.05	$ 5.91	$ 2.91	$ 2.98
Diluted (in dollars per share)	$ 4.88	$ 0.05	$ 0.48	$ 0.45	$ 0.56	$ 0.05	$ 1.21	$ 1.05	$ 5.88	$ 2.90	$ 2.97

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	$ 0	$ 2,116	$ 0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(7,770)	3,795	15,315
Net earnings	97,339	49,554	55,983
Defined benefit pension and other postretirement employee benefits:
Net gain arising during the period, net of tax of $2,409, $248 and $5,814	6,745	379	8,944
Amortization of actuarial loss included in net periodic cost, net of tax of $1,305, $1,576, and $4,972	1,951	2,321	7,647
Amortization of prior service credit included in net periodic cost, net of tax of $(601), $(669), and $(829)	926	1,021	1,276
Other comprehensive (loss) income, net of tax	7,770	3,795	15,315
Comprehensive income	$ 105,109	$ 53,349	$ 71,298

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net (loss) gain arising during the period, tax benefit (provision)	$ (2,409)	$ (248)	$ (5,814)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax	0	1,366	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	0	0	0
Amortization of actuarial loss included in net periodic cost, tax expense	(1,305)	(1,576)	(4,972)
Amortization of prior service credit included in net periodic cost, tax benefit	$ (601)	$ (669)	$ (829)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 15,738	$ 23,001
Receivables, net	142,065	147,074
Taxes receivable	20,282	9,709
Inventories	266,043	258,029
Other Assets, Current	8,661	8,682
Total current assets	452,789	446,495
Property, plant and equipment, net	1,050,982	945,328
Goodwill	244,161	244,283
Intangible assets, net	32,542	40,485
Other assets, net	21,778	7,751
TOTAL ASSETS	1,802,252	1,684,342
Current liabilities:
Line of Credit, Current	155,000	135,000
Accounts payable and accrued liabilities	256,621	223,699
Current liability for pensions and other postretirement employee benefits	7,631	7,821
Total current liabilities	419,252	366,520
Long-term debt	570,524	569,755
Liability for pensions and other postretirement employee benefits	72,469	81,812
Other long-term obligations	43,275	41,776
Accrued taxes	2,770	2,434
Deferred Tax Liabilities, Gross, Noncurrent	118,528	152,172
Liabilities	1,226,818	1,214,469
Stockholders' equity:
Preferred stock, par value $0.0001 per share, 5,000,000 authorized shares, no shares issued	0	0
Common stock, par value $0.0001 per share, 100,000,000 authorized shares-16,447,898 and 24,223,191 shares issued	2	2
Additional paid-in capital	1,161	347,080
Retained earnings	618,254	569,861
Treasury stock, at cost, common shares–0 and 7,736,255 shares	0	(395,317)
Accumulated other comprehensive loss, net of tax	(43,983)	(51,753)
Total stockholders’ equity	575,434	469,873
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,802,252	$ 1,684,342

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 0.0001000000	$ 0.0001000000
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)		0
Common Stock, Par or Stated Value Per Share	$ 0.0001000000	$ 0.0001000000
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	16,447,898	24,223,191
Treasury stock, shares (in shares)	0	7,736,255

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 97,339	$ 49,554	$ 55,983
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	104,990	91,090	84,732
Equity-based compensation expense	3,620	12,385	4,557
Deferred taxes	(40,589)	18,327	16,081
Employee benefit plans	(4,371)	(1,979)	3,011
Deferred issuance costs on debt	1,199	1,242	928
Disposal of plant and equipment, net	4,053	1,381	1,492
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	1,750	758	(1,020)
Changes in working capital, net of acquisition	21,761	(3,462)	14,841
Change in taxes receivable, net	(10,573)	5,142	(13,596)
Excess tax benefits from equity-based payment arrangements	0	(312)	(1,433)
Funding of qualified pension plans	0	0	(3,179)
Other, net	(1,509)	(1,375)	(2,722)
Net cash flows from operating activities	177,670	172,751	159,675
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net	0	250	49,750
Additions to property, plant and equipment	(199,748)	(155,349)	(128,902)
Payments to Acquire Businesses, Net of Cash Acquired	0	67,443	0
Proceeds from sale of assets	951	36	604
Net cash flows from investing activities	(198,797)	(222,506)	(78,548)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock	(4,875)	(65,327)	(99,990)
Proceeds from Lines of Credit	298,308	1,273,959	0
Repayments of Lines of Credit	(278,308)	(1,138,959)	0
Payments for debt issuance costs	0	(1,906)	0
Payment of tax withholdings on equity-based payment arrangements	(1,127)	(933)	(4,152)
Excess tax benefits from equity-based payment arrangements	0	312	1,433
Other, net	(134)	0	(139)
Net cash flows from financing activities	13,864	67,146	(102,848)
(Decrease) increase in cash and cash equivalents	(7,263)	17,391	(21,721)
Cash and cash equivalents at beginning of period	23,001	5,610	27,331
Cash and cash equivalents at end of period	15,738	23,001	5,610
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest, net of amounts capitalized	28,085	26,690	28,195
Cash paid for income taxes	2,684	17,655	35,849
Cash received from income tax refunds	7,638	11,289	2,533
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING ACTIVITIES:
Changes in accrued property, plant and equipment	(1,063)	328	5,202
Non-cash changes to plant, property, and equipment	4,241	0	0
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	99,710	50,773	56,393
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	76,862	68,496	65,078
Equity-based compensation expense	3,620	12,385	4,557
Deferred taxes	(16,957)	18,860	9,944
Employee benefit plans	(4,371)	(1,979)	3,011
Deferred issuance costs on debt	1,199	1,242	928
Disposal of plant and equipment, net	512	781	(1,587)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	1,750	740	(1,028)
Changes in working capital, net of acquisition	8,776	642	(11,809)
Change in taxes receivable, net	(5,099)	(1,078)	9,461
Excess tax benefits from equity-based payment arrangements		(312)	(1,433)
Funding of qualified pension plans			3,179
Other, net	1,585	(1,592)	(1,591)
Net cash flows from operating activities	167,587	149,830	136,615
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net		250	49,750
Additions to property, plant and equipment	(193,864)	(145,579)	(121,720)
Payments to Acquire Businesses, Net of Cash Acquired		67,443
Proceeds from sale of assets	283	0	0
Net cash flows from investing activities	(193,581)	(212,772)	(71,970)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock	(4,875)	(65,327)	(99,990)
Proceeds from Lines of Credit	298,308	1,273,959
Repayments of Lines of Credit	(278,308)	(1,138,959)
Payments for debt issuance costs		(1,906)
Payment of tax withholdings on equity-based payment arrangements	(1,127)	(933)	(4,152)
Excess tax benefits from equity-based payment arrangements		312	1,433
Other, net	(134)		(139)
Net cash flows from financing activities	22,146	76,918	(86,366)
(Decrease) increase in cash and cash equivalents	(3,848)	13,976	(21,721)
Cash and cash equivalents at beginning of period	19,586	5,610	27,331
Cash and cash equivalents at end of period	15,738	19,586	5,610
Guarantor Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	11,911	5,331	2,476
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	28,128	22,594	19,654
Equity-based compensation expense	0	0	0
Deferred taxes	(23,632)	605	3,178
Employee benefit plans	0	0	0
Deferred issuance costs on debt	0	0	0
Disposal of plant and equipment, net	3,541	600	(95)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	0	(18)	(8)
Changes in working capital, net of acquisition	5,529	774	3,032
Change in taxes receivable, net	(5)	(1,405)	(14,388)
Excess tax benefits from equity-based payment arrangements		0	0
Funding of qualified pension plans			0
Other, net	(3,094)	(921)	(1,131)
Net cash flows from operating activities	22,378	27,596	12,734
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net		0	0
Additions to property, plant and equipment	(5,884)	(9,770)	(7,182)
Payments to Acquire Businesses, Net of Cash Acquired		0
Proceeds from sale of assets	668	36	604
Net cash flows from investing activities	(5,216)	(9,734)	(6,578)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock	0	0	0
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Payments for debt issuance costs		0
Payment of tax withholdings on equity-based payment arrangements	0	0	0
Excess tax benefits from equity-based payment arrangements		0	0
Other, net	0		0
Net cash flows from financing activities	(20,577)	(14,447)	(6,156)
(Decrease) increase in cash and cash equivalents	(3,415)	3,415	0
Cash and cash equivalents at beginning of period	3,415	0	0
Cash and cash equivalents at end of period	$ 0	$ 3,415	$ 0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Shares, Outstanding at Dec. 31, 2014		24,056			(4,498)
Beginning Balance at Dec. 31, 2014	$ 497,537	$ 2	$ 334,074	$ 464,324	$ (230,000)	$ (70,863)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	55,983			55,983
Performance share and restricted stock unit awards (in shares)		137
Performance share and restricted stock unit awards	6,021		6,021
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	15,315					15,315
Purchase of treasury stock (in shares)					1,882
Purchase of treasury stock	(99,990)				$ (99,990)
Shares, Outstanding at Dec. 31, 2015		24,193			(6,380)
Ending Balance at Dec. 31, 2015	474,866	$ 2	340,095	520,307	$ (329,990)	(55,548)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	49,554			49,554	$ 0
Performance share and restricted stock unit awards (in shares)		30
Performance share and restricted stock unit awards	6,985		6,985
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3,795					3,795
Purchase of treasury stock (in shares)					1,356
Purchase of treasury stock	(65,327)				$ (65,327)
Shares, Outstanding at Dec. 31, 2016					(7,736)
Ending Balance at Dec. 31, 2016	469,873	$ 2	347,080	569,861	$ (395,317)	(51,753)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	97,339			97,339
Performance share and restricted stock unit awards (in shares)		46
Performance share and restricted stock unit awards	5,327		5,327			0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(7,770)	$ 0			$ 0	7,770
Purchase of treasury stock (in shares)					7,821
Purchase of treasury stock	0	$ 0	(351,246)	(48,946)	$ 400,192
Shares, Outstanding at Dec. 31, 2017		16,448			0
Ending Balance at Dec. 31, 2017	$ 575,434	$ 2	$ 1,161	$ 618,254	$ 0	$ (43,983)

Consolidated Statements of Sto9

Consolidated Statements of Stockholders' Equity Consolidate Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Loss
Pension and OPEB, Tax	$ 3,113	$ 2,521	$ 9,957

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	12 Months Ended
	Dec. 31, 2017
Disclosure Nature Of Operations And Basis Of Presentation Additional Information [Abstract]
Nature of Operations and Basis of Presentation	Nature of Operations and Basis of Presentation Clearwater Paper manufactures quality consumer tissue, away-from-home tissue, parent roll tissue, bleached paperboard and pulp at manufacturing facilities across the nation. The company is a premier supplier of private label tissue to major retailers and wholesale distributors, including grocery, drug, mass merchants and discount stores. In addition, the company produces bleached paperboard used by quality-conscious printers and packaging converters, and offers services that include custom sheeting, slitting and cutting. Clearwater Paper's employees build shareholder value by developing strong customer relationships through quality and service. Unless the context otherwise requires or unless otherwise indicated, references in this report to “Clearwater Paper Corporation,” “we,” “our,” “the company” and “us” refer to Clearwater Paper Corporation and its subsidiaries. On February 17, 2014, we announced the permanent and immediate closure of our Long Island, New York, tissue converting and distribution facility. We have incurred $24.6 million of costs associated with the closure, of which $1.4 million was incurred in 2017 primarily related to a facility lease that expired in 2017. On December 16, 2016, we acquired Manchester Industries, or Manchester, an independently-owned paperboard sales, sheeting and distribution supplier to the packaging and commercial print industries, for total consideration of $71.7 million . The acquisition of Manchester's customers extends our reach and service platform to small and mid-sized folding carton plants, offering a range of converting services that include custom sheeting, slitting and cutting. Manchester's operations subsequent to the acquisition date are reflected in our financial statements. On March 31, 2017, we closed our Oklahoma City, Oklahoma converting facility. Notwithstanding the closure, we remain subject to the terms of a long-term master lease applicable to the facility. In October 2017, we transferred to a third party substantially all of the remaining fixed assets and supplies inventory located at this facility and subleased the facility to the third party for the remaining term of the master lease for the facility. In connection with the transfer of fixed assets, we recorded a loss of $4.3 million in the third quarter of 2017 related primarily to the write down of the transferred assets to their held-for-sale value, and a loss of $3.2 million in the fourth quarter of 2017 related to the execution of the sublease agreement, which is included in “Selling, general and administrative expenses” in our Consolidated Statement of Operations. The sublease agreement is expected to substantially reduce our cash requirements under the master lease over the term of the sublease. In addition to the above amounts, we incurred $7.2 million of closure-related costs associated with the Oklahoma City facility for the twelve months ended December 31, 2017, which is largely included in "Cost of sales" in our Consolidated Statement of Operations. These consolidated financial statements include the financial condition and results of operations of Clearwater Paper Corporation and its wholly-owned subsidiaries. All intercompany transactions and balances between operations within the company have been eliminated.

Summary of Significant Accoutin

Summary of Significant Accouting Policies	12 Months Ended
	Dec. 31, 2017
Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies SIGNIFICANT ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the U.S., which we refer to in this report as GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Significant areas requiring the use of estimates and measurement of uncertainty include determination of valuation for deferred tax assets, uncertain income tax positions, assessment of impairment of long-lived assets and goodwill, assessment of environmental matters, allocation of purchase price and fair value estimates for business combinations, equity-based compensation and pension and postretirement obligation assumptions. Actual results could differ from those estimates and assumptions. CASH AND CASH EQUIVALENTS We consider all highly liquid instruments with maturities of three months or less to be cash equivalents. As of December 31, 2017 and 2016, we had cash and cash equivalents of $15.7 million and $23.0 million , respectively, on our Consolidated Balance Sheets. TRADE ACCOUNTS RECEIVABLE Trade accounts receivable are stated at the amount we expect to collect. Trade accounts receivable do not bear interest. The allowance for doubtful accounts is our best estimate of the losses we expect will result from the inability of our customers to make required payments. We generally determine the allowance based on a combination of actual historical write-off experience and an analysis of specific customer accounts. As of December 31, 2017 and 2016 , we had allowances for doubtful accounts of $1.4 million and $1.5 million , respectively. Bad debt expense, net, charged to selling, general and administrative expenses during 2017 , 2016 and 2015 was $0.2 million , $0.7 million , and $0.2 million , respectively. All other activity impacting the allowance for doubtful accounts was immaterial for all periods. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost, including assets acquired under capital lease obligations and any interest costs capitalized, less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method. Estimated useful lives generally range from 10 to 40 years for land improvements; 10 to 40 years for buildings and improvements; 5 to 25 years for machinery and equipment; and 2 to 15 years for office and other equipment. Assets we acquire through business combinations have estimated lives that are typically shorter than the assets we construct or buy new. We review the carrying value of our property, plant and equipment for impairment when events or changes in circumstances indicate that the carrying amount of those assets may not be recoverable. An impairment of property, plant and equipment exists when the carrying value is not considered to be recoverable through future undiscounted cash flows from operations and the carrying value of the assets exceeds the estimated fair value. On March 31, 2017, we closed our Oklahoma City converting facility. For the twelve months ended December 31, 2017, we incurred $14.7 million of costs associated with this announced closure, which includes $3.7 million in accelerated depreciation on certain fixed assets. For the twelve months ended December 31, 2016, we incurred $1.7 million of costs associated with this announced closure, which includes $1.3 million in accelerated depreciation on certain fixed assets. INTANGIBLE ASSETS We use estimates in determining and assigning the fair value of the useful lives of intangible assets, the amount and timing of related future cash flows and fair values of the related operations. Our intangible assets have definite lives and are amortized over their estimated useful lives. We assess our intangible assets for impairment annually and when events or changes in circumstances indicate that the carrying amount may not be recoverable. We recorded intangible assets as a result of our December 2016 acquisition of Manchester. See Note 7, "Goodwill and Intangible Assets" for further discussion. GOODWILL Goodwill from an acquisition represents the excess of the cost of a business acquired over the net of the amounts assigned to assets acquired, including identifiable intangible assets and liabilities assumed. We use estimates in determining and assigning the fair value of goodwill, including the amount and timing of related future cash flows and fair values of the related operations. Goodwill is not amortized but is tested for impairment annually as of November 1, as well as any time when events suggest impairment may have occurred. In the event the carrying value of the reporting unit in which our goodwill is assigned exceeds the estimated fair value of that reporting unit, an impairment loss would be recognized to the extent the carrying amount of the reporting unit exceeds its implied fair value. We recorded $229.5 million of goodwill in connection with our acquisition of Cellu Tissue in December 2010 . All of the recorded goodwill was assigned to our Consumer Products segment and reporting unit. As a result of the December 2014 sale of our Consumer Products segment's specialty business and mills, a portion of goodwill was allocated to the divested mills and included in our loss on divested assets. We recorded $35.1 million of goodwill in connection with our acquisition of Manchester. The goodwill from this acquisition is included in our Pulp and Paperboard segment. See Note 8, "Goodwill and Intangible Assets" for further discussion. PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS The determination of pension plan expense and the requirements for funding our pension plans are based on a number of actuarial assumptions. Three critical assumptions are the discount rate applied to pension plan obligations, the rate of return on plan assets and mortality rates. For other postretirement employee benefit, or OPEB, plans, which provide certain health care and life insurance benefits to qualified retired employees, significant assumptions in determining OPEB income are the discount rate applied to benefit obligations, and mortality rates. We also participate in multiemployer defined benefit pension plans. We make contributions to these multiemployer plans, as well as make contributions to a trust fund established to provide retiree medical benefits for a portion of these employees. The discount rate used in the determination of pension benefit obligations and pension expense is determined based on a review of long-term high-grade bonds and management's expectations. To determine the expected long-term rate of return on pension assets, we employ a process that analyzes historical long-term returns for various investment categories, as measured by appropriate indices. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. An increase in the discount rate or the rate of expected return on plan assets, all other assumptions remaining the same, would decrease pension plan expense, and conversely, a decrease in either of these measures would increase plan expense. The actual rates of return on plan assets may vary significantly from the assumptions used because of unanticipated changes in financial markets. The estimated net loss and prior service cost (credit) for the defined benefit pension and OPEB plans is amortized from accumulated other comprehensive loss into net periodic cost (benefit) in accordance with current accounting guidance. Net periodic pension and OPEB expenses are included in “Cost of sales” and “Selling, general and administrative expenses” in the Consolidated Statements of Operations. The expense is allocated to all business segments. In accordance with current accounting guidance governing defined benefit pension and other postretirement plans, at December 31, 2017 and 2016 , long-term assets are recorded for overfunded single-employer plans and liabilities are recorded for underfunded single-employer plans. The funded status of a benefit plan is measured as the difference between plan assets at fair value and the projected benefit obligation. For underfunded single-employer plans, the estimated liability to be payable in the next twelve months is recorded as a current liability, with the remaining portion recorded as a long-term liability. INCOME TAXES Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in our consolidated financial statements only after determining a more-likely-than-not probability that the uncertain tax positions will withstand challenge, if any, from tax authorities. When facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate . REVENUE RECOGNITION We recognize net sales when there is persuasive evidence of a sales agreement, the price to the customer is fixed and determinable, collection is reasonably assured, and title and the risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed. Revenue is recognized at shipment for sales when shipping terms are free on board, or FOB, shipping point. For sales where shipping terms are FOB destination, revenue is recognized when the goods are received by the customer. Revenue from both domestic and foreign sales of our products can involve shipping terms of either FOB shipping point or FOB destination or other shipping terms, depending upon the sales agreement with the customer. We had one customer in the Consumer Products segment, the Kroger Company, that accounted for approximately 15.3% of our total company net sales in 2017, approximately 13.4% of our total company net sales in 2016, and approximately 12.3% of our total company net sales in 2015. We provide for trade promotions, customer cash discounts, customer returns and other deductions as reductions to net sales in the same period as the related revenues are recognized. Provisions for these items are determined based on historical experience or specific customer arrangements. Revenue is recognized net of any sales taxes collected. Sales taxes, when collected, are recorded as a current liability and remitted to the appropriate governmental entities. ENVIRONMENTAL As part of our corporate policy, we have an ongoing process to monitor, report on and comply with environmental requirements. Based on this ongoing process, accruals for environmental liabilities that are not within the scope of specific authoritative guidance related to accounting for asset retirement obligations or conditional asset retirement obligations are established in accordance with guidance related to accounting for contingencies. We estimate our environmental liabilities based on various assumptions and judgments, the specific nature of which varies in light of the particular facts and circumstances surrounding each environmental liability. These estimates typically reflect assumptions and judgments as to the probable nature, magnitude and timing of required investigation, remediation and monitoring activities and the probable cost of these activities. Currently, we are not aware of any material environmental liabilities and have accrued only for specific costs related to environmental matters that we have determined are probable and for which an amount can be reasonably estimated. Fees for professional services associated with environmental and legal issues are expensed as incurred. STOCKHOLDERS’ EQUITY On December 15, 2015, we announced that our Board of Directors had approved a stock repurchase program authorizing the repurchase of up to $100 million of our common stock. The repurchase program authorizes purchases of our common stock from time to time through open market purchases, negotiated transactions or other means, including accelerated stock repurchases and 10b5-1 trading plans in accordance with applicable securities laws and other restrictions. We have no obligation to repurchase stock under this program and may suspend or terminate the program at any time. In total, we have repurchased 1,440,696 shares of our outstanding common stock pursuant to the repurchase program, of which 84,750 shares were repurchased during 2017 at an average price of $57.53 per share. As of December 31, 2017, we had up to $29.8 million of authorization remaining pursuant to this stock repurchase program. On December 15, 2014, we announced that our Board of Directors had approved a stock repurchase program authorizing the repurchase of up to $100 million of our common stock. We completed this program during the fourth quarter of 2015. In total, we repurchased 1,881,921 shares of our outstanding common stock at an average price of $53.13 per share under this program. During 2017, we retired 7,821,005 treasury shares. The impact of this retirement was reflected within the stockholders' equity line items on our Consolidated Balance Sheet. DERIVATIVES We had no activity during the years ended December 31, 2017 , 2016 and 2015 that required hedge or derivative accounting treatment. However, to partially mitigate our exposure to market risk for changes in utility commodity pricing, we use firm price contracts to supply a portion of the natural gas requirements for our manufacturing facilities. As of December 31, 2017 , these contracts covered approximately 17% of the expected average monthly requirements for 2018, including approximately 30% of the expected average monthly requirements for the first quarter. For the years ended December 31, 2017 , 2016 and 2015 , approximately 28% , 45% , and 57% , respectively, of our natural gas volumes were supplied through firm price contracts. These contracts qualify for treatment as “normal purchases or normal sales” under authoritative guidance and thus require no mark-to-market adjustment.

Recently Adopted and New Accoun

Recently Adopted and New Accounting Standards	12 Months Ended
	Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Adopted and Prospective Accounting Standards	Recently Adopted and New Accounting Standards Recently Adopted In January 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) 2017-04, Simplifying the Test for Goodwill Impairment (Topic 350). This ASU eliminates step two of the impairment test, the performance of a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. We adopted this standard on January 1, 2017 and applied this standard during our annual impairment test as of November 1, 2017. The adoption of this standard did not have a material impact on our consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This ASU clarifies the definition of a business and provides a screen to determine when an integrated set of assets and activities is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the asset is not a business. We adopted this standard on January 1, 2017. This standard did not have a material impact on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718),(ASU 2016-09), which simplifies several aspects of accounting for share-based payment transactions, including income tax consequences, award classification, cash flows reporting, and forfeiture rate application. Specifically, the update requires all excess tax benefits and tax deficiencies to be recognized as income tax expense or benefit in the income statement. The update also allows excess tax benefits to be classified along with other income tax cash flows as an operating activity on the statement of cash flows. In addition, when accruing compensation cost, an entity can make an entity-wide accounting policy election to either estimate the number of awards expected to vest or to account for forfeitures as they occur. Lastly, the update requires cash paid by an employer when directly withholding shares for tax-withholding purposes to be classified as a financing activity on the statement of cash flows, consistent with our historical practice. We adopted ASU 2016-09 in the first quarter of 2017. We have not changed our method of estimating forfeitures as a result of our adoption of this standard. As a result of adopting this standard, excess tax benefits are classified along with other income tax cash flows as an operating activity on the statement of cash flows on a prospective basis and $2.2 million was charged to our income tax provision for the year ended December, 2017, resulting in a $0.13 earnings per share impact. New Accounting Standards In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income to allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (Act). This ASU also requires certain disclosures about stranded tax effects. The ASU will be effective prospectively for annual periods beginning after December 15, 2018, including interim periods within those annual periods. We plan to adopt this standard on January 1, 2018. The adoption of this standard will result in a reclassification between retained earnings and accumulated other comprehensive loss (AOCL), increasing AOCL within the equity section of our Consolidated Balance Sheet. We do not expect the adoption of this ASU to have a material impact on our consolidated financial statements. We are continuing our assessment of this new accounting standard. In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting to clarify when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The ASU will be effective prospectively for annual periods beginning after December 15, 2017, including interim periods within those annual periods. We plan to adopt this standard on January 1, 2018. We do not expect the adoption of this ASU to have a material impact on our consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The amendments in this ASU require that an employer disaggregate the service cost component from the other components of net benefit cost. The amendments also provide explicit guidance on how to present the service cost component and other components of net benefit cost in the income statement and allow only the service cost component of net benefit cost to be eligible for capitalization. This ASU will be effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. We plan to adopt this standard on January 1, 2018. The amendments in this update require retrospective presentation in the income statement. Changes to the capitalized portion of both service cost and the other components of net benefit cost within inventory will be applied prospectively. The adoption of this ASU will not have a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We expect the adoption of this ASU will increase both our assets and liabilities presented on our Consolidated Balance Sheets to reflect the ROU assets and corresponding lease liabilities, as well as increase our leasing disclosures. As of December 31, 2017, the total future minimum lease payments for our operating leases totaled $75.3 million . We plan to adopt this standard on January 1, 2019. We are continuing our assessment and review of existing leases, which may identify other impacts, and are addressing necessary policy and process changes in preparation for adoption. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of the new standard is for companies to recognize revenue in a manner that depicts the transfer of goods or services to customers in amounts that reflect the consideration, or payment, to which the company expects to be entitled in exchange for those goods or services. The standard will also result in enhanced disclosures about revenue, provide guidance for transactions that were not previously addressed comprehensively, such as service revenue and contract modifications, and clarify guidance for multiple-element arrangements. This standard was originally issued as effective for fiscal years and interim periods within those years beginning after December 15, 2016, with early adoption prohibited. However, in July 2015, the FASB approved deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The new guidance requires enhanced disclosures, including revenue recognition policies to identify performance obligations to customers and significant judgments in measurement and recognition.The guidance permits a retrospective application of the new standard with certain practical expedients (contracts completed within the same annual reporting period need not be restated and other allowances for contracts with variable consideration) or retrospective application with a cumulative effect adjustment to the beginning balance of retained earnings. We will adopt the new revenue guidance effective January 1, 2018 using the cumulative effect method, and will not have an adjustment to retained earnings upon adoption. However, the adoption of Topic 606 will result in additional disclosures and updated internal controls and procedures around revenue recognition. We reviewed all other new accounting pronouncements issued in the period and concluded that they are not applicable to our business.

Business Combinations (Notes)

Business Combinations (Notes)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Business Combinations On December 16, 2016, we acquired Manchester for total consideration of $71.7 million . The purchase price included a $67.5 million cash payment, after adjusting for a working capital closing adjustment of $0.7 million , as well as $4.2 million in net liabilities effectively settled. The acquisition was financed with existing cash and proceeds from our revolving credit facilities. The acquisition resulted in the recognition of $35.1 million of goodwill, which is not deductible for tax purposes. Manchester's operations are included in our Pulp and Paperboard segment. Goodwill recorded in the acquisition of Manchester was based on the purchase price allocation. We allocated the purchase price to the net assets of Manchester Industries acquired in the acquisition based on our estimates of the fair value of assets and liabilities as follows: (in thousands) Amount Current assets $ 22,046 Property, plant and equipment 6,967 Goodwill 35,074 Intangible assets 25,472 Assets acquired 89,559 Current liabilities 5,403 Deferred tax liabilities 12,491 Liabilities assumed 17,894 Net assets acquired $ 71,665 We estimated the fair value of the assets and liabilities of Manchester utilizing information available at the time of acquisition. We considered outside third-party appraisals of the tangible and intangible assets to determine the applicable fair market values. In the fourth quarter of 2017, we completed the collection of information necessary to complete our determination of the fair values included in the purchase price in association with the final tax basis of acquired intangible assets and fixed assets used in the determination of deferred tax liabilities at the acquisition date. As a result, the deferred tax liabilities and goodwill associated with this acquisition were reduced by $0.1 million . All costs associated with advisory, legal and other due diligence-related services performed in connection with acquisition-related activity are expensed as incurred. These costs were $0.2 million and $2.7 million for 2017 and 2016, respectively, and were recorded as selling, general and administrative expenses on our Consolidated Statements of Operations. No supplemental pro-forma information is presented for the acquisition due to the immaterial pro-forma effect of the acquisition on our results of operations for all years presented.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories December 31, (In thousands) 2017 2016 Pulp, paperboard and tissue products $ 165,281 $ 154,460 Materials and supplies 85,987 82,005 Logs, pulpwood, chips and sawdust 14,775 21,564 $ 266,043 $ 258,029 At December 31, 2017 , our inventories are stated at the lower of net realizable value or current average cost using the average cost method.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment December 31, (In thousands) 2017 2016 Machinery and equipment $ 2,124,701 $ 2,000,512 Buildings and improvements 340,042 328,251 Land improvements 49,908 47,844 Office and other equipment 46,467 40,051 Land 11,726 7,266 Construction in progress 114,424 103,429 $ 2,687,268 $ 2,527,353 Less accumulated depreciation and amortization (1,636,286 ) (1,582,025 ) $ 1,050,982 $ 945,328 The December 31, 2017 and 2016 buildings and improvements and machinery and equipment combined balances include $24.4 million associated with capital leases. Depreciation expense, including amounts associated with capital leases, totaled $97.0 million , $86.1 million and $79.8 million in 2017 , 2016 and 2015 , respectively. For 2017 , 2016 , and 2015, we capitalized $4.6 million , $2.3 million and $0.4 million , respectively, of interest expense associated with the construction of a continuous pulp digester at our Lewiston, Idaho pulp and paperboard mill and the construction of a paper machine at our Shelby, North Carolina consumer products facility. On November 29, 2016, we announced the permanent closure of our Oklahoma City converting facility, effective March 31, 2017, and the permanent shutdown of two of the five tissue machines at our Neenah, Wisconsin, tissue facility, effective late-December 2016. In association with the March 31, 2017 closure of the Oklahoma City facility, we recorded accelerated depreciation of $3.7 million in the first quarter of 2017 and $1.3 million in the fourth quarter of 2016.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The carrying amount of goodwill is reviewed at least annually for impairment as of November 1. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit is greater than zero and its estimated fair value exceeds its carrying amount, goodwill of the reporting unit is not considered impaired. For the purpose of goodwill impairment testing, goodwill associated with the Cellu Tissue acquisition was measured at the Consumer Products reporting unit level, which is the same as the Consumer Products reportable operating segment, and goodwill associated with the Manchester acquisition was measured at the Pulp and Paperboard reporting unit level, which is the same as the Pulp and Paperboard reportable operating segment (see Note 19, "Segment Information"). As of December 31, 2017 , we had goodwill of $244.2 million recorded on our Consolidated Balance Sheet, which includes $209.1 million related to our Cellu Tissue acquisition and $35.1 million related to our Manchester acquisition, as discussed in Note 4, "Business Combinations." In addition, we recorded $25.5 million of intangible assets related to the Manchester acquisition. As of November 1, 2017 , we performed calculations of both discounted cash flow and market-based valuation models for both our Consumer Products reporting unit and our Pulp and Paperboard reporting unit. The assumptions used in these models allowed us to evaluate the estimated fair values of our reporting units. The determination of these assumptions required significant estimates on our part. Due to the inherent uncertainty involved in making such estimates, actual results could differ from those assumptions. However, we evaluated the merits of each significant assumption, both individually and in the aggregate, used to determine the estimated fair value of our reporting units for reasonableness. Upon completion of this exercise, we concluded that the estimated fair values of the Consumer Products reporting unit and the Pulp and Paperboard reporting unit exceeded their respective carrying amounts. We determined that no further testing was necessary and did not record any impairment loss on our goodwill for the years ended December 31, 2017 and 2016 . Intangible asset amounts represent the acquisition date fair values of identifiable intangible assets acquired. The fair values of the intangible assets were determined by using the income approach, discounting projected future cash flows based on management’s expectations of the current and future operating environment. The rates used to discount projected future cash flows reflected a weighted average cost of capital based on our industry, capital structure and risk premiums including those reflected in the current market capitalization. Definite-lived intangible assets are amortized over their useful lives, which have historically ranged from 5 to 10 years. Authoritative guidance under ASC 360, Property, Plant and Equipment, requires that the carrying amount of a long-lived asset with a definite life that is held-for-use be evaluated for recoverability whenever events or changes in circumstances indicate that the entity may be unable to recover the asset’s carrying amount. We assessed our definite-lived intangible assets for impairment in 2017 and 2016 and concluded that their carrying amounts were recoverable and that no further testing was necessary. We do not have any indefinite-lived intangible assets recorded from acquisitions. Intangible assets at the balance sheet dates are comprised of the following : December 31, 2017 (Dollars in thousands, lives in years) Weighted Average Useful Life Historical Cost Accumulated Amortization Net Balance Customer relationships 9.3 $ 62,401 $ (34,061 ) $ 28,340 Trade names and trademarks 7.4 6,786 (3,000 ) 3,786 Non-compete agreements 5.0 574 (574 ) — Other intangibles 6.0 572 (156 ) 416 Total intangible assets $ 70,333 $ (37,791 ) $ 32,542 December 31, 2016 (Dollars in thousands, lives in years) Weighted Average Useful Life Historical Cost Accumulated Amortization Net Balance Customer relationships 9.3 $ 62,401 $ (27,364 ) $ 35,037 Trade names and trademarks 7.4 6,786 (1,972 ) 4,814 Non-compete agreements 5.0 574 (512 ) 62 Other Intangibles 6.0 572 — 572 Total intangible assets $ 70,333 $ (29,848 ) $ 40,485 As of December 31, 2017 , estimated future amortization expense related to intangible assets is as follows (in thousands): Years ending December 31, Amount 2018 $ 7,801 2019 7,801 2020 3,246 2021 2,917 2022 2,217 Thereafter 8,560 Total $ 32,542

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Earnings before income taxes is comprised of the following amounts: For The Years Ended December 31, (In thousands) 2017 2016 2015 United States $ 40,954 $ 80,666 $ 92,488 The income tax (benefit) provision is comprised of the following: For The Years Ended December 31, (In thousands) 2017 2016 2015 Current Federal $ (16,729 ) $ 7,434 $ 15,579 State 933 5,351 4,855 Foreign — — (10 ) Total current (15,796 ) 12,785 20,424 Deferred Federal (36,810 ) 15,573 13,006 State (3,779 ) 2,754 3,075 Total deferred (40,589 ) 18,327 16,081 Income tax (benefit) provision $ (56,385 ) $ 31,112 $ 36,505 The income tax provision or benefit differs from the amount computed by applying the statutory federal income tax rate of 35.0% to earnings before income taxes due to the following: For The Years Ended December 31, (In thousands) 2017 2016 2015 Tax at the statutory rate $ 14,334 $ 28,233 $ 32,371 Federal rate change (70,055 ) — — State and local taxes, net of federal income tax impact (1,201 ) 3,046 3,753 Federal credits and net operating losses (3,158 ) (2,850 ) 3,593 Stock compensation 2,207 — — Other, net 1,488 2,683 (3,212 ) Income tax provision $ (56,385 ) $ 31,112 $ 36,505 During 2017 and 2016, the valuation allowance for deferred tax assets decreased by $0.7 million and $0.6 million , respectively. In March 2016 the FASB issued ASU 2016-09, Improvements to Employee Share Based Payment Accounting. We adopted the standard during the first quarter of 2017. The standard requires all excess tax benefits and deficiencies to be recognized as income tax expense or benefit discretely in the reporting period in which they occur. During 2017, we recognized $2.2 million in tax expense for stock based compensation. We use the flow-through method to account for investment tax credits earned on eligible expenditures. Under this method, the investment tax credits are recognized as a reduction to income tax expense in the year they are earned. During 2017, we recognized $2.4 million related to energy investment tax credits. The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: (In thousands) 2017 2016 Deferred tax assets: Employee benefits $ 3,940 $ 6,255 Postretirement employee benefits 17,132 27,370 Incentive compensation 5,194 11,356 Inventories 7,959 8,859 Pensions 2,516 8,338 State credit carryforwards 11,752 8,369 State net operating losses 3,088 1,462 Other 1,949 3,774 Total deferred tax assets $ 53,530 $ 75,783 Valuation allowance (3,733 ) (4,407 ) Deferred tax assets, net of valuation allowance $ 49,797 $ 71,376 Deferred tax liabilities: Plant and equipment $ (153,885 ) $ (206,502 ) Intangible assets (7,577 ) (14,136 ) Total deferred tax liabilities (161,462 ) (220,638 ) Net deferred tax liabilities $ (111,665 ) $ (149,262 ) Net deferred tax assets (liabilities) consist of: (In thousands) 2017 2016 Non-current deferred tax assets 1 6,863 2,910 Non-current deferred tax liabilities (118,528 ) (152,172 ) Net non-current deferred tax liabilities (111,665 ) (149,262 ) Net deferred tax liabilities $ (111,665 ) $ (149,262 ) 1 Included in "Other assets, net" on our accompanying December 31, 2017 and 2016 Consolidated Balance Sheets. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (Act). The Act made broad and complex changes to the U.S. tax code. For the year ended December 31, 2017, we recorded a tax benefit for the impact of the Act of approximately $70 million which represents the remeasurement of our net deferred tax liabilities resulting from the permanent reduction in the U.S. statutory corporate tax rate to 21% from 35% . We have net investment tax credits associated with state jurisdictions totaling $11.1 million which expire between 2018 and 2033. The following presents a roll forward of our unrecognized tax benefits and associated interest and penalties, $2.8 million of which is included in the "Accrued taxes" line item in non-current liabilities in our Consolidated Balance Sheets. The remaining $1.3 million consists of unrecorded receivables and certain tax attributes that are uncertain. (In thousands) Gross Unrecognized Tax Benefits, Excluding Interest and Penalties Interest and Penalties Total Gross Unrecognized Tax Benefits Balance at December 31, 2015 $ 4,227 $ 221 $ 4,448 Change in prior year tax positions 619 36 655 Reductions as a result of a lapse of the applicable statute of limitations (234 ) (20 ) (254 ) Change in current year tax positions 291 — 291 Balance at December 31, 2016 $ 4,903 $ 237 $ 5,140 Change in prior year tax positions (1,149 ) 48 (1,101 ) Change in current year tax positions 320 — 320 Balance at December 31, 2017 $ 4,074 $ 285 $ 4,359 Unrecognized tax benefits net of related deferred tax assets at December 31, 2017 , if recognized, would favorably impact our effective tax rate by decreasing our tax provision by $3.6 million . For each of the years ended December 31, 2016 and 2015, if recognized, the balance of unrecognized tax benefits would favorably impact our effective tax rate by $4.1 million and $3.2 million , respectively. We reflect accrued interest related to tax obligations, as well as penalties, in our provision for income taxes. For the years ended December 31, 2017 , 2016, and 2015, we accrued interest of less than $0.1 million each year in our income tax provision. We recorded no penalties in the years ended December 31, 2017, 2016, and 2015. We have certain state benefits related to filing positions taken which have not been recognized on the balance sheet. Although the uncertain tax position was not reflected in the balance sheet as a recorded liability, it is disclosed in the tabular roll forward for unrecognized tax benefits. We have operations in many states within the U.S. and are subject, at times, to tax audits in these jurisdictions. With a few exceptions, we are no longer subject to U.S. federal, state and local, or foreign income tax examinations by tax authorities for years prior to 2014. We expect that the outcome of any examination will not have a material effect on our consolidated financial statements. Although the timing of resolution of audits is not certain, we evaluate all audit issues in the aggregate, along with the expiration of applicable statutes of limitations, and estimate that it is reasonably possible the total gross unrecognized tax benefits could decrease by approximately $0.9 million within the next 12 months.

Accounts Payable and Accrued Li

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities December 31, (In thousands) 2017 2016 Trade accounts payable $ 169,293 $ 128,106 Accrued wages, salaries and employee benefits 41,979 49,871 Accrued interest 12,723 12,149 Accrued discounts and allowances 7,283 10,291 Accrued taxes other than income taxes payable 6,907 6,946 Accrued utilities 6,759 6,712 Other 11,677 9,624 $ 256,621 $ 223,699

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt $300 MILLION SENIOR NOTES DUE 2025 On July 29, 2014 we issued $300 million aggregate principal amount of senior notes, which we refer to as the 2014 Notes. The 2014 Notes mature on February 1, 2025 , have an interest rate of 5.375% and were issued at their face value. The issuance of these notes generated net proceeds of approximately $298 million after deducting offering expenses. The 2014 Notes are guaranteed by all of our direct and indirect domestic subsidiaries. The 2014 Notes will also be guaranteed by each of our future direct and indirect domestic subsidiaries that do not constitute an immaterial subsidiary under the indenture governing the 2014 Notes. The 2014 Notes are equal in right of payment with all other existing and future unsecured senior indebtedness and are senior in right of payment to any future subordinated indebtedness. The 2014 Notes are effectively subordinated to all of our existing and future secured indebtedness, including borrowings under our secured revolving credit facilities, which are secured by certain of our accounts receivable, inventory and cash. The terms of the 2014 Notes limit our ability and the ability of any restricted subsidiaries to incur certain liens, engage in sale and leaseback transactions and consolidate, merge with, or convey, transfer or lease substantially all of our or their assets to another person. We may, on any one or more occasions, redeem all or a part of the 2014 Notes, upon not less than 30 days nor more than 60 days ' notice, at a redemption price equal to 100% of the principal amount of the 2014 Notes redeemed, plus the applicable premium as of, and accrued and unpaid interest, if any, to the date of redemption. Unless we default in the payment of the redemption price, interest will cease to accrue on the 2014 Notes or portions thereof called for redemption on the applicable redemption date. In addition, we may be required to make an offer to purchase the 2014 Notes upon the sale of certain assets and upon a change of control. $275 MILLION SENIOR NOTES DUE 2023 On February 22, 2013, we issued $275 million aggregate principal amount of senior notes on January 23, 2013 , which we refer to as the 2013 Notes. The 2013 Notes mature on February 1, 2023, have an interest rate of 4.5% and were issued at their face value. The issuance of these notes generated net proceeds of approximately $271 million after deducting offering expenses. The 2013 Notes are guaranteed by all of our direct and indirect domestic subsidiaries. The 2013 Notes will also be guaranteed by each of our future direct and indirect domestic subsidiaries that we do not designate as an unrestricted subsidiary under the indenture governing the 2013 Notes. The 2013 Notes are equal in right of payment with all other existing and future unsecured senior indebtedness and are senior in right of payment to any future subordinated indebtedness. The 2013 Notes are effectively subordinated to all of our existing and future secured indebtedness, including borrowings under our secured revolving credit facilities, which are secured by certain of our accounts receivable, inventory and cash. The terms of the 2013 Notes limit our ability and the ability of any restricted subsidiaries to borrow money; pay dividends; redeem or repurchase capital stock; make investments; sell assets; create restrictions on the payment of dividends or other amounts to us from any restricted subsidiaries; enter into transactions with affiliates; enter into sale and lease back transactions; create liens; and consolidate, merge or sell all or substantially all of our assets. After February 1, 2018, we may redeem all or a portion of the 2013 Notes at specified redemption prices plus accrued and unpaid interest. In addition, we may be required to make an offer to purchase the 2013 Notes upon the sale of certain assets and upon a change of control. REVOLVING CREDIT FACILITIES On October 31, 2016, we terminated and paid in full all outstanding amounts under our $125 million senior secured revolving credit facility and replaced that facility with two new senior secured revolving credit facilities. The senior secured revolving credit facilities provide in the aggregate, on a combined basis, for the extension of up to $300 million in revolving loans under: (i) a $200 million credit agreement with Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto (the “Commercial Credit Agreement”); and (ii) a $100 million credit agreement with Northwest Farm Credit Services, PCA, as administrative agent, and the lenders party thereto (the “Farm Credit Agreement”). We refer to both of these credit agreements collectively as the “Credit Agreements.” The revolving credit facilities provided under the Credit Agreements mature on October 31, 2021. Revolving Loans borrowed under the Commercial Credit Agreement bear interest, at our option, at a LIBOR rate or at a base rate, plus an applicable margin, which for LIBOR rate loans may range from 1.25% per annum to 2.00% per annum, based on the Company’s consolidated total leverage ratio. The applicable margin for base rate loans under the Commercial Credit Agreement is 1.00% per annum less than for LIBOR rate loans. Revolving Loans borrowed under the Farm Credit Agreement are calculated in substantially the same manner as under the Commercial Credit Agreement, however, the applicable margin under the Farm Credit Agreement is 0.25% per annum higher than the Commercial Credit Agreement, and the prime rate used in the calculation of base rate loans is based upon the prime rate published by the Wall Street Journal. In addition, under the Farm Credit Agreement, we have the option to elect fixed rate periods of interest which bear interest at an applicable margin equal to the LIBOR rate. We also pay commitment fees on the unused portion of the revolving loan commitments under the Credit Agreements, which range from 0.20% per annum to 0.35% per annum. The Credit Agreements are secured by substantially all of the personal property of the Company and its domestic subsidiaries through separate liens granted under each Credit Agreement for the benefit of each secured party thereunder on an equal and ratable basis. The Company’s obligations under the Credit Agreements are guaranteed by the Company’s domestic subsidiaries. The Credit Agreements contain various loan covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, incurrence of indebtedness, creation of liens, mergers or consolidations, dispositions of assets, repurchase or redemption of capital stock, making certain investments, entering into certain transactions with affiliates or changing the nature of their business. In addition, the Credit Agreements contain financial covenants that require the Company to maintain a consolidated total leverage ratio in an amount not to exceed 4.50 to 1.00 in 2018, 4.25 to 1.00 in 2019 and 4.00 to 1.00 thereafter (subject to certain exceptions with respect to acquisitions in excess of an agreed threshold amount) and a consolidated interest coverage ratio in an amount not less than 1.75 to 1.00 through 2020 and 2.25 to 1.00 thereafter. Each Credit Agreement also contains customary events of default, including failure to make payments under such Credit Agreement, breach of any representation or warranty or covenant under such Credit Agreement, default under or acceleration of other indebtedness for borrowed money in excess of an agreed amount, any change in control of the Company based upon a third party acquiring more than 35% of the equity interests of the Company, bankruptcy events, invalidity of such credit agreement, the incurrence of certain liabilities, termination events or withdrawals from specified benefit plans, and unpaid or uninsured judgments in excess of an agreed amount. We may separately request incremental commitments under either Credit Agreement to increase the amount of revolving loans or to provide term loans under such Credit Agreement in an aggregate amount not to exceed $200 million (on a combined basis under both Credit Agreements), plus an additional amount, not to exceed $100 million (also on a combined basis under both Credit Agreements), such that our first lien leverage ratio on a pro forma basis, as defined, does not exceed 3.00 to 1.00, subject to certain customary conditions and receipt of commitments by existing or additional lenders. In addition, after giving effect to the amount of any incremental borrowing under the Farm Credit Agreement, the principal amount of all unfunded revolving loan commitments and the outstanding amount of any term loans provided under the Farm Credit Agreement (if any) cannot exceed 50% of the sum of the outstanding principal amount of the loans and unfunded commitments under the Farm Credit Agreement and the Commercial Credit Agreement on a combined basis. We are members of the Northwest Farm Credit Services, PCA system which entitles us to patronage refunds and other distributions on account of our equity interests in the Northwest Farm Credit Services, PCA, as well as our patronage with Northwest Farm Credit Services. Patronage refunds are distributions of profits from member banks in the United States Farm Credit System, like Northwest Farm Credit Services, which are cooperatives (member owned) that distribute profits to their members in the form of patronage dividends, which are accrued as earned and recorded as offsets to interest expense under the Farm Credit Agreement. As of December 31, 2017, there was an aggregate of $155 million of borrowings outstanding under the Credit Agreements and we were in compliance with the covenants contained in the Credit Agreements. In addition, $7.6 million of the credit facilities was being used to support outstanding standby letters of credit. The borrowings outstanding under the Credit Agreements as of December 31, 2017, consisted of short-term base and LIBOR rate loans and are classified as current liabilities in our Consolidated Balance Sheet. As of December 31, 2017, we would have been permitted to draw an additional $137.4 million under the credit facilities.

Other Long-Term Obligations

Other Long-Term Obligations	12 Months Ended
	Dec. 31, 2017
Disclosure Other Long Term Obligations [Abstract]
Other Long-Term Obligations	Other Long-Term Obligations December 31, (In thousands) 2017 2016 Long-term lease obligations, net of current portion $ 26,460 $ 23,152 Deferred proceeds 5,576 9,013 Deferred compensation 5,023 7,219 Other 6,216 2,392 $ 43,275 $ 41,776

Reclassification out of Accumul

Reclassification out of Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income [Text Block]	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss at the balance sheet dates is comprised of the following: (In thousands) Pension and Other Post Retirement Employee Benefit Plan Adjustments Balance at December 31, 2015 $ (55,548 ) Other comprehensive income before reclassifications 2 2,495 Amounts reclassified from accumulated other comprehensive loss 1,300 Other comprehensive income, net of tax 1 3,795 Balance at December 31, 2016 $ (51,753 ) Other comprehensive income before reclassifications 6,745 Amounts reclassified from accumulated other comprehensive loss 1,025 Other comprehensive income, net of tax 1 7,770 Balance at December 31, 2017 $ (43,983 ) 1 For the year ended December 31, 2017 , net periodic costs associated with our pension and other postretirement employee benefit, or OPEB, plans included in other comprehensive loss and reclassified from accumulated other comprehensive loss, or AOCL, included $9.2 million of net gain on plan assets, $3.3 million of actuarial loss amortization, and $1.5 million of prior service credit amortization, less total tax of $3.1 million . For the year ended December 31, 2016 , net periodic costs associated with our pension and OPEB plans included in other comprehensive income and reclassified from AOCL included $0.6 million of net gain on plan assets, $3.9 million of actuarial loss amortization, and $1.7 million of prior service credit amortization, less total tax of $1.2 million . These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” 2 Included in "Other comprehensive income before reclassifications" above for the twelve months ended December 31, 2016 is settlement expense of $3.5 million associated with the remeasurement of our salaried pension plan, which is discussed further in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” The settlement expense is net of tax totaling $1.4 million .

Savings, Pension and Other Post

Savings, Pension and Other Postretirement Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Savings, Pension and Other Postretirement Employee Benefit Plans	Savings, Pension and Other Postretirement Employee Benefit Plans Certain of our employees are eligible to participate in defined contribution savings and defined benefit postretirement plans. These include 401(k) savings plans, defined benefit pension plans including company-sponsored and multiemployer plans, and other postretirement employee benefit, or OPEB, plans, each of which is discussed below. 401(k) Savings Plans Substantially all of our employees are eligible to participate in 401(k) savings plans, which include a company match component. In 2017 , 2016 and 2015 we made 401(k) contributions on behalf of employees of $16.6 million , $16.9 million , and $16.9 million , respectively. Company-Sponsored Defined Benefit Pension Plans A majority of our salaried employees and a portion of our hourly employees are covered by company-sponsored noncontributory defined benefit pension plans. During 2016, we announced a voluntary, limited-time opportunity for former employees who are vested participants in certain of our qualified pension plans to request early payment of their entire pension plan benefit in the form of a single lump sum payment. The amount of total payments under this program totaled approximately $10.6 million for salaried employees and $4.8 million for hourly employees and were made from the applicable plan's trust assets during the third quarter of 2016. Based on the level of payments made, settlement accounting rules applied to our salaried pension plan and resulted in a remeasurement of that plan as of August 31, 2016 and the recognition of $3.5 million in settlement expense in 2016. Company-Sponsored OPEB Plans We also provide retiree health care and life insurance plans, which cover certain salaried and hourly employees. Retiree health care benefits for Medicare eligible participants over the age of 65 are provided through Health Reimbursement Accounts, or HRA's. Benefits for retirees under the age of 65 are provided under our company-sponsored health care plans, which require retiree contributions and contain other cost-sharing features. The retiree life insurance plans are primarily noncontributory. Funded Status of Company-Sponsored Plans As required by current standards governing the accounting for defined benefit pension and other postretirement benefit plans, we recognized the funded status of our company-sponsored plans on our Consolidated Balance Sheets at December 31, 2017 and 2016 . The funded status is measured as the difference between plan assets at fair value (with limited exceptions) and the benefit obligation. For a pension plan, the benefit obligation is the projected benefit obligation; for any other postretirement employee benefit plan, such as a retiree health care plan, the benefit obligation is the accumulated postretirement employee benefit obligation. We use a December 31 measurement date for our benefit plans. The changes in benefit obligation, plan assets and funded status for company-sponsored benefit plans as of December 31 are as follows: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Benefit obligation at beginning of year $ 304,388 $ 318,444 $ 69,163 $ 71,672 Service cost 2,069 1,562 163 249 Interest cost 13,149 14,072 2,745 3,075 Plan settlements — (10,629 ) — — Actuarial losses (gains) 19,130 6,225 (1,254 ) 816 Benefits paid (20,922 ) (25,286 ) (5,689 ) (6,649 ) Benefit obligation at end of year 317,814 304,388 65,128 69,163 Fair value of plan assets at beginning of year 285,638 294,076 20 20 Actual return on plan assets 45,796 27,056 — — Employer contribution 454 421 5,689 6,649 Plan settlements — (10,629 ) — — Benefits paid (20,922 ) (25,286 ) (5,689 ) (6,649 ) Fair value of plan assets at end of year 310,966 285,638 20 20 Funded status at end of year $ (6,848 ) $ (18,750 ) $ (65,108 ) $ (69,143 ) The December 31, 2017 pension funded status was affected by favorable asset returns, partially offset by a decrease in the discount rate. The December 31, 2017 OPEB benefit obligation decreased slightly primarily driven by changes in the assumed health care cost trend rate and census changes, partially offset by a decrease in the discount rate. Amounts recognized in the Consolidated Balance Sheets: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Non-current assets $ 8,144 $ 1,740 $ — $ — Current liabilities (441 ) (397 ) (7,190 ) (7,424 ) Non-current liabilities (14,551 ) (20,093 ) (57,918 ) (61,719 ) Net amount recognized $ (6,848 ) $ (18,750 ) $ (65,108 ) $ (69,143 ) Pre-tax amounts recognized in Accumulated Other Comprehensive Loss as of December 31 consist of: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Net loss (gain) $ 99,865 $ 117,640 $ (15,541 ) $ (20,906 ) Prior service cost (credit) — 8 (1,676 ) (3,211 ) Net amount recognized $ 99,865 $ 117,648 $ (17,217 ) $ (24,117 ) Information as of December 31 for certain pension plans included above with accumulated benefit obligations in excess of plan assets were as follows: (In thousands) 2017 2016 Projected benefit obligation $ 178,452 $ 170,716 Accumulated benefit obligation 178,452 170,716 Fair value of plan assets 163,460 150,226 Pre-tax components of net periodic cost and other amounts recognized in Other Comprehensive Income (Loss) for the years ended December 31 were as follows: Net Periodic Cost: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2015 2017 2016 2015 Service cost $ 2,069 $ 1,562 $ 1,244 $ 163 $ 249 $ 363 Interest cost 13,149 14,072 13,931 2,745 3,075 3,881 Expected return on plan assets (18,765 ) (19,389 ) (20,117 ) (1 ) (1 ) (1 ) Amortization of prior service cost (credit) 8 22 73 (1,535 ) (1,712 ) (2,178 ) Amortization of actuarial loss (gain) 9,874 11,463 12,619 (6,618 ) (7,566 ) — Settlement — 3,482 — — — — Net periodic cost $ 6,335 $ 11,212 $ 7,750 $ (5,246 ) $ (5,955 ) $ 2,065 Other amounts recognized in Other Comprehensive Income (Loss): Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2015 2017 2016 2015 Net (gain) loss $ (7,901 ) $ (1,445 ) $ 15,942 $ (1,253 ) $ 818 $ (30,700 ) Amortization of prior service (cost) credit (8 ) (22 ) (73 ) 1,535 1,712 2,178 Amortization of actuarial (loss) gain (9,874 ) (11,463 ) (12,619 ) 6,618 7,566 — Settlement — (3,482 ) — — — — Total recognized in other comprehensive (income) loss $ (17,783 ) $ (16,412 ) $ 3,250 $ 6,900 $ 10,096 $ (28,522 ) Total recognized in net periodic cost and other comprehensive (income) loss $ (11,448 ) $ (5,200 ) $ 11,000 $ 1,654 $ 4,141 $ (26,457 ) The estimated net loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic cost (benefit) over the next fiscal year is $10.3 million . The estimated net gain and prior service credit for the OPEB plans that will be amortized from accumulated other comprehensive loss into net periodic cost (benefit) over the next fiscal year are $0.9 million and $1.7 million respectively. During 2017 , $0.6 million of net periodic pension and OPEB costs were charged to "Cost of sales," and $0.4 million were charged to "Selling, general and administrative expenses" in the accompanying Consolidated Statements of Operations, as compared to $3.0 million and $2.3 million , respectively, during 2016 . Weighted average assumptions used to determine the benefit obligation as of December 31 were: Pension Benefit Plans Other Postretirement Employee Benefit Plans 2017 2016 2015 2017 2016 2015 Discount rate 3.90 % 4.45 % 4.70 % 3.95 % 4.30 % 4.50 % Weighted average assumptions used to determine the net periodic cost for the years ended December 31 were: Pension Benefit Plans Other Postretirement Employee Benefit Plans 2017 2016 2015 2017 2016 2015 Discount rate 4.45 % 4.70 % 4.25 % 4.30 % 4.50 % 4.15 % Expected return on plan assets 6.75 6.75 7.00 — — — The discount rate used in the determination of pension benefit obligations and pension expense was determined based on a review of long-term high-grade bonds as well as management’s expectations. The discount rate used to calculate OPEB obligations was determined using the same methodology we used for our pension plans. The expected return on plan assets assumption is based upon an analysis of historical long-term returns for various investment categories, as measured by appropriate indices. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. The assumed health care cost trend rate used to calculate 2017 OPEB income was 7.40% in 2017 , grading to 4.00% over approximately 70 years , for participants whose benefits are not provided through HRAs, and 2.50% annually for participants whose benefits are provided through HRAs. The health care cost trend rate used to calculate December 31, 2017 OPEB obligations was 6.70% in 2018 , grading to 4.00% over approximately 70 years , for participants whose benefits are not provided through HRAs, and 2.50% annually for participants whose benefits are provided through HRAs. This assumption has a significant effect on the amounts reported. A one percentage point change in the health care cost trend rates would have the following effects: (In thousands) 1% Increase 1% Decrease Effect on total of service and interest cost components $ 193 $ (168 ) Effect on postretirement employee benefit obligation 4,150 (3,614 ) The investments of our defined benefit pension plans are held in a Master Trust. The assets of our OPEB plans are held within an Internal Revenue Code section 401(h) account for the payment of retiree medical benefits within the Master Trust. Current accounting rules governing fair value measurement establish a framework for measuring fair value, which provides a fair value hierarchy 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). The three levels of the fair value hierarchy are described below: Level 1 Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the plans have the ability to access. Level 2 Inputs to the valuation methodology include: ▪ Quoted prices for similar assets or liabilities in active markets; ▪ Quoted prices for identical or similar assets or liabilities in inactive markets; ▪ Inputs other than quoted prices that are observable for the asset or liability; and ▪ Inputs that are derived principally from or corroborated by observable market data by correlation or other means If the asset or liability has a specified (contractual) term, the Level 2 input must be observable for substantially the full term of the asset or liability. Level 3 Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. There have been no changes in the methodologies used during 2017 and 2016 . Investments in common and collective trust funds are generally valued based on their respective net asset value, or NAV, (or its equivalent), as a practical expedient to estimate fair value due to the absence of a readily determinable fair value. Investments that may be fully redeemed at NAV in the near-term are disclosed in the table below as "Investments measured at net asset value" in accordance with Accounting Standards Codification 820 - Fair Value Measurements and Disclosures. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while management believes the valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. The following tables set forth by level, within the fair value hierarchy, the investments at fair value for our company-sponsored pension benefit plans: December 31, 2017 (In thousands) Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 2,010 $ — $ 2,010 Common and collective trust: Collective investment funds — 308,956 308,956 Total investments at fair value $ 2,010 $ 308,956 $ 310,966 December 31, 2016 (In thousands) Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 2,002 $ — $ 2,002 Common and collective trusts: Collective investment funds — 283,636 283,636 Total investments at fair value $ 2,002 $ 283,636 $ 285,638 Our OPEB plan had $20,000 held in cash and cash equivalents at December 31, 2017 and 2016 , which were categorized as level 1. We have formal investment policy guidelines for our company-sponsored plans. These guidelines were set by our Benefits Committee, which is comprised of members of our management and has been assigned its fiduciary authority over management of the plan assets by our Board of Directors. The Committee’s duties include periodically reviewing and modifying those investment policy guidelines as necessary and insuring that the policy is adhered to and the investment objectives are met. The investment policy includes guidelines for specific categories of equity and fixed income securities. Assets are managed by professional investment managers who are expected to achieve a reasonable rate of return over a market cycle. Long-term performance is a fundamental tenet of the policy. The general policy states that plan assets would be invested to seek the greatest return consistent with the fiduciary character of the pension funds and to allow the plans to meet the need for timely pension benefit payments. The specific investment guidelines stipulate that management is to maintain adequate liquidity for meeting expected benefit payments by reviewing, on a timely basis, contribution and benefit payment levels and appropriately revising long-term and short-term asset allocations. Management takes reasonable and prudent steps to preserve the value of pension fund assets, avoid the risk of large losses and also attempt to preserve the funded status of the plans. Major steps taken to provide this protection included: ▪ Assets are diversified among various asset classes, such as domestic equities, international equities, fixed income and cash. The long-term asset allocation ranges are as follows: Domestic equities 14%-22% International equities, including emerging markets 13%-22% Corporate bonds 50%-70% Liquid reserves 0%-5% Periodically, reviews of allocations within these ranges are made to determine what adjustments should be made based on changing economic and market conditions and specific liquidity requirements. • Assets were managed by professional investment managers and could be invested in separately managed accounts or commingled funds. ▪ Assets were not invested in securities rated below BBB- by S&P or Baa3 by Moody’s. The investment guidelines also require that the individual investment managers are expected to achieve a reasonable rate of return over a market cycle. Emphasis is placed on long-term performance versus short-term market aberrations. Factors considered in determining reasonable rates of return include performance achieved by a diverse cross section of other investment managers, performance of commonly used benchmarks (e.g., Russell 3000 Index, MSCI World ex-U.S. Index, Barclays Capital Long Credit Index), actuarial assumptions for return on plan investments and specific performance guidelines given to individual investment managers. As of December 31, 2017 , nine active investment managers managed substantially all of the pension funds, each of whom had responsibility for managing a specific portion of these assets. Plan assets were diversified among the various asset classes within the allocation ranges approved by the Benefits Committee. In 2017 , we did not make any contributions to our qualified pension plans, and we currently do not anticipate making any cash contributions to those plans in 2018 . We contributed $0.5 million to our non-qualified pension plan in 2017 . We do not anticipate funding our OPEB plans in 2018 except to pay benefit costs as incurred during the year by plan participants. Estimated future benefit payments are as follows for the years indicated: (In thousands) Pension Benefit Plans Other Postretirement Employee Benefit Plans 2018 20,210 7,210 2019 20,372 6,700 2020 20,338 6,224 2021 20,278 5,182 2022 20,257 4,639 2023-2027 99,994 18,702 Multiemployer Defined Benefit Pension Plans Hourly employees at two of our manufacturing facilities participate in multiemployer defined benefit pension plans: the PACE Industry Union-Management Pension Fund, or PIUMPF, which is managed by United Steelworkers, or USW, Benefits; and the International Association of Machinist & Aerospace Workers National Pension Fund, or IAM NPF. We make contributions to these plans, as well as make contributions to a trust fund established to provide retiree medical benefits for a portion of these employees, which is also managed by USW Benefits. The risks of participating in these multiemployer plans are different from single-employer plans in the following respects: ▪ Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. ▪ If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. In 2013, two large employers withdrew from PIUMPF and in 2015, the largest employer in PIUMPF also withdrew. Additional employers have continued to withdraw, or announced plans to withdraw, from the fund in 2016 and 2017, including the second largest remaining employer at the beginning of 2018. We believe that we are now the largest contributing employer. ▪ Further withdrawals by contributing employers could cause a “mass withdrawal” from, or effectively a termination of, PIUMPF, or alternatively we could elect to withdraw. ▪ Under applicable federal law, any employer contributing to a multiemployer pension plan that completely ceases participating in the plan while it is underfunded is subject to an assessment of such employer's allocable share of the aggregate unfunded vested benefits of the plan. In certain circumstances, an employer can also be assessed a withdrawal liability for a partial withdrawal from a multiemployer pension plan. Based on our records as of December 31, 2017, as well as information provided by PIUMPF and reviewed by our actuarial consultant, we estimate the aggregate pre-tax liability that we would have incurred if we had completely withdrawn from PIUMPF in 2017 would have been in excess of $78 million . However, the exact amount of potential exposure could be higher or lower than the estimate, depending on, among other things, the nature and timing of any triggering events and the funded status of PIUMPF at that time. A withdrawal liability is recorded for accounting purposes when withdrawal is probable and the amount of the withdrawal obligation is reasonably estimable. Our participation in these plans for the annual period ended December 31, 2017 , is outlined in the table below. The “EIN" and "Plan Number” columns provide the Employee Identification Number, or EIN, and the three-digit plan number. The most recent Pension Protection Act, or PPA, zone status available in 2017 and 2016 is for a plan’s year-end as of December 31, 2017 and December 31, 2016 , respectively. The zone status is set under the provisions of the Multiemployer Pension Plan Reform Act of 2014 and is based on information we received from the plans and is certified by each plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent but more than 65 percent funded, and plans in the green zone are at least 80 percent funded. The “FIP/RP Status Pending/Implemented” column indicates plans for which a Funding Improvement Plan, or FIP, or a Rehabilitation Plan, or RP, is either pending or has been implemented as required by the PPA as a measure to correct its underfunded status. The last column lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject. In 2017, the contribution rates for the IAM NPF plan was $4.00 per hour. In 2017, the contribution rates for PIUMPF was $2.79 per hour. In 2015, contribution rates for PIUMPF were increased as part of the RP in lieu of the legally required surcharge, paid by the employers, to assist the fund’s financial status. We were listed in PIUMPF’s Form 5500 report as providing more than five percent of the total contributions for the years 2016 and 2015. At the date of issuance of our consolidated financial statements, Form 5500 reports for these plans were not available for the 2017 plan year. Pension Fund EIN Plan Number PPA Zone Status 1 FIP/RP Status Pending/ Implemented Contributions (in thousands) Surcharge Imposed Expiration Date of Collective Bargaining Agreement 2017 2016 2017 2016 2015 IAM NPF 51-6031295 002 Green Green N/A $ 333 $ 335 $ 329 No 5/31/2018 PIUMPF 11-6166763 001 Red Red Implemented 5,815 5,679 5,631 No 8/31/2017 Total Contributions: $ 6,148 $ 6,014 $ 5,960 1 PIUMPF has been certified as in "Critical and Declining Status" for 2017 and 2016, under the provisions of the Multiemployer Pension Plan Reform Act of 2014.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings (loss) per share are based on the weighted average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted average number of shares of common stock outstanding plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. This method requires that the effect of potentially dilutive common stock equivalents be excluded from the calculation of diluted earnings per share for the periods in which net losses are reported because the effect is anti-dilutive. The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share: December 31, 2017 2016 2015 Basic average common shares outstanding 1 16,464,286 17,000,599 18,762,451 Incremental shares due to: Restricted stock units 21,522 21,668 33,128 Performance shares 45,252 76,525 24,717 Stock options 24,866 7,648 — Diluted average common shares outstanding 16,555,926 17,106,440 18,820,296 Basic net earnings per common share $ 5.91 $ 2.91 $ 2.98 Diluted net earnings per common share 5.88 2.90 2.97 Anti-dilutive shares excluded from calculation 499,348 220,037 331,168 1 Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 15, "Equity-Based Compensation Plans" for further discussion.

Equity-Based Compensation Plans

Equity-Based Compensation Plans	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity-Based Compensation Plans	Equity-Based Compensation Plans At December 31, 2017, we have two stock incentive plans in place: the Clearwater Paper Corporation Amended and Restated 2008 Stock Incentive Plan which became effective on December 16, 2008 , and was amended and restated effective as of February 27, 2015, and the Clearwater Paper Corporation 2017 Stock Incentive Plan, which became effective February 28, 2017 , collectively referred to as, the Stock Plans. Our Stock Plans have been approved by our stockholders, and provide for equity-based awards in the form of restricted shares, restricted stock units, or RSUs, performance shares, stock options or stock appreciation rights to selected employees, outside directors, and consultants of the company. Under our Stock Plans we are authorized to issue up to approximately 6.2 million shares, which includes approximately 0.7 million additional shares authorized in connection with our acquisition of Cellu Tissue that are available for issuance as equity-based awards only to any employees, outside directors, or consultants who were not employed on December 26, 2010 by Clearwater Paper Corporation or any of its subsidiaries. At December 31, 2017 , approximately 3.6 million shares were available for future issuance under the Stock Plans. We recognize equity-based compensation expense for all equity-based payment awards made to employees and directors, including RSUs, performance shares and stock options, based on estimated fair values and net of estimates of future forfeitures. The expense is classified in "Selling, general and administrative expense" in our Consolidated Statements of Operations and is recognized on a straight-line basis over the requisite service periods of each award. Based on the terms of the Clearwater Paper Corporation Amended and Restated 2008 Stock Incentive Plan, and for grants prior to 2017, employees who were retirement-eligible during the service period became fully vested in outstanding awards on the later of the date they reached retirement eligibility or at the end of the first calendar year of each respective grant. We account for this feature when determining the service period over which to recognize expense for each grant of RSUs, performance shares, and stock options. For the Clearwater Paper Corporation 2017 Stock Incentive Plan and for grants beginning in 2017, employees who are retirement-eligible during the service period become fully vested in outstanding awards on a prorated basis based on the portion of the service period for which they were employed in alignment with the terms of each respective grant type as outlined in the respective stock plan. Employees are not eligible to receive shares until the end of the applicable service period for performance shares, and the applicable vesting period for RSUs and stock options. Employee equity-based compensation expense was recognized as follows: (In thousands) 2017 2016 2015 Restricted stock units $ 1,618 $ 1,381 $ 2,116 Performance shares 2,283 3,311 4,408 Stock options 2,552 2,913 2,106 Total employee equity-based compensation $ 6,453 $ 7,605 $ 8,630 Related tax benefit $ 2,149 $ 2,767 $ 3,193 RESTRICTED STOCK UNITS RSUs granted under our Stock Plans are generally subject to a vesting period of one to three years, with generally the same service period. RSU awards will accrue dividend equivalents based on dividends paid, if any, during the RSU vesting period. The dividend equivalents will be converted into additional RSUs that will vest in the same manner as the underlying RSUs to which they relate. RSUs granted under our Stock Plans do not represent common stock, and therefore the holders do not have voting rights unless and until shares are issued upon settlement. A summary of the status of outstanding unvested RSU awards as of December 31, 2017 , 2016 , and 2015 , and changes during those years, is presented below: 2017 2016 2015 Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Unvested shares outstanding at January 1 54,460 $ 47.16 46,029 $ 60.17 93,254 $ 47.95 Granted 66,774 56.45 44,627 39.10 23,148 62.02 Vested (17,531 ) 62.75 (29,338 ) 55.16 (65,217 ) 43.86 Forfeited (9,232 ) 53.52 (6,858 ) 47.80 (5,156 ) 58.58 Unvested shares outstanding at December 31 94,471 50.22 54,460 47.16 46,029 60.17 Aggregate intrinsic value (in thousands) $ 4,289 $ 3,570 $ 2,096 During 2017 , 25,940 RSU shares were settled and distributed in common stock. Of these shares, 20,940 were RSU shares that were settled and distributed in the fourth quarter of 2017 . Another 1,775 shares were RSU shares that were settled in prior years but distribution had been deferred to preserve tax deductibility for the Company in the respective years because distribution of these shares would have resulted in certain executive compensation being above the Internal Revenue Code section 162(m) threshold for those years. After adjusting for minimum tax withholdings, a net 17,834 shares were issued during 2017 . The minimum tax withholdings payment made in 2017 in connection with issued shares was $1.1 million . During 2016 , 45,143 RSU shares were settled and distributed, of which 19,196 shares were settled and distributed in the fourth quarter. After adjusting for minimum tax withholdings and deferred shares, a net 30,093 shares were issued during 2016 . The minimum tax withholdings payment made in 2016 in connection with issued shares was $0.9 million . As of December 31, 2017 a total of 33,663 shares remain deferred under Internal Revenue Code section 162(m). The fair value of each RSU share award granted during 2017 was estimated on the date of grant using the grant date market price of our common stock. The total fair value of share awards that vested during 2017 was $1.1 million . As of December 31, 2017 , there was $2.8 million of total unrecognized compensation cost related to outstanding RSU awards. The cost is expected to be recognized over a weighted average period of 1.8 years. PERFORMANCE SHARES Performance share awards granted under our Stock Plan have a three -year performance period, with generally the same service period, and shares are issued after the end of the period if the employee provides the requisite service and the performance measure is met. For 2016 and prior years, and for 40% of performance shares granted in 2017, the performance measure used was a comparison of the percentile ranking of our total stockholder return (TSR) compared to the TSR performance of a selected peer group or index. The performance measure is considered to represent a “market condition” under authoritative accounting guidance, and thus, the market condition is considered when determining the estimate of the fair value of the performance share awards. In 2017, for 60% of the performance share awards granted, a return on invested capital (ROIC) performance measure is being used to determine the number of performance shares ultimately issuable. The final ROIC calculation is the average of the three one-year ROIC results for each year in the performance period. The number of shares actually issued, as a percentage of the amount subject to the performance share award, could range from 0% - 200% . Performance share awards granted under our Stock Plans do not represent common stock, and therefore the holders do not have voting rights unless and until shares are issued upon settlement. During the performance period, dividend equivalents accrue based on dividends paid, if any, and are converted into additional performance shares, which vest or are forfeited in the same manner as the underlying performance shares to which they relate. Generally, if an employee terminates prior to completing the requisite service period, all or a portion of their awards are forfeited and the previously recognized compensation cost is reversed. If an employee provides the requisite service through the end of the performance period, but the performance measure is not met, following authoritative guidance for awards with a market condition, previously recognized compensation cost is not reversed. The fair value of performance share awards is estimated using a Monte Carlo simulation model. For performance shares granted in 2017 , the following assumptions were used in our Monte Carlo model: Closing price of stock on date of grant $ 56.75 Risk free rate 1.42 % Measurement period 3 years Volatility 35 % In addition to the above assumptions, the dividend yields for all companies were assumed to be zero since dividends are included in the definition of total stockholder return. A summary of the status of outstanding performance share awards as of December 31, 2017 , 2016 , and 2015 , and changes during those years, is presented below: 2017 2016 2015 Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Outstanding share awards at January 1 175,683 $ 62.26 92,563 $ 84.18 300,864 $ 59.77 Granted 33,907 58.58 93,397 39.70 47,513 62.05 Settled (87,491 ) 84.65 — — (245,525 ) 50.43 Forfeited (4,847 ) 47.61 (10,277 ) 54.55 (10,289 ) 73.61 Outstanding share awards at December 31 117,252 45.10 175,683 62.26 92,563 84.18 Aggregate intrinsic value (in thousands) $ 5,323 $ 11,516 $ 4,214 On December 31, 2017 , the three-year performance period for 41,538 performance shares granted in 2015 ended. The requisite market condition performance measure was not met, and as such no shares were paid or issued under those awards. On December 31, 2016 , the service and performance period for 45,953 outstanding shares granted in 2014 ended. Those performance shares were settled and distributed in the first quarter of 2017. The number of shares actually settled, as a percentage of the outstanding amount, was 89.0% . After adjusting for the related minimum tax withholdings, a net 27,878 shares were issued in the first quarter of 2017. As of December 31, 2017 , there was $2.3 million of unrecognized compensation cost related to outstanding performance share awards. The cost is expected to be recognized over a weighted average period of 1.2 years. STOCK OPTIONS Beginning in 2014, stock options were granted to certain employees under our Stock Plans. The stock options are generally subject to a vesting period of one to three years , with generally the same service period. Upon vesting, the holder is entitled to purchase a specified number of shares of Clearwater Paper common stock at a price per share equal to the closing market price of Clearwater Paper common stock on the date of grant. Once options have vested they are exercisable. The options are exercisable for 10 years from the date of grant. Stock options granted under our Stock Plan do not represent common stock, and therefore the holders do not have voting rights unless and until shares have been issued to the employee. The fair value of stock option awards was determined using a Black-Scholes option-pricing model. The Black-Scholes model utilizes a range of assumptions related to dividend yield, volatility, risk-free interest rate and employee exercise behavior. Expected volatility is based on Clearwater Paper's historical stock prices. The risk-free interest rate is based on constant maturity treasury rates with maturities matching the options' expected life on the grant date. The expected life, estimated in accordance with Securities and Exchange Commission Staff Accounting Bulletin 110, is the approximate mid-point between the expected vesting time and the remaining contractual life. Volatility 30 % Risk-free interest rate 2.05 % Expected life-years 6.0 A summary of the status of outstanding stock option awards as of December 31, 2017 , and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Outstanding options at 150,580 $ 66.84 $ 258 Granted 142,542 61.93 $ 20.82 Forfeited (15,429 ) 64.12 Outstanding options at 277,693 $ 64.47 $ — Granted 280,191 38.86 14.42 Forfeited (30,830 ) 47.79 Outstanding options at December 31, 2016 527,054 $ 51.83 $ 7,232 Granted 158,484 56.45 18.82 Forfeited (22,306 ) 50.74 Expired (5,913 ) 66.97 Outstanding options at December 31, 2017 2,017 657,319 $ 52.84 7.4 $ — As of December 31, 2017 , there was $3.1 million of unrecognized compensation cost related to nonvested stock options. The cost is expected to be recognized over a weighted average period of 1.4 years. During 2017 , 124,617 stock option awards vested with a weighted average exercise price of $61.95 and total fair value of $7.7 million . These options are outstanding at December 31, 2017 and became exercisable on January 1, 2018. The weighted average remaining contractual term of options that vested during the year is 7.0 years. Exercisable stock option awards are included in the detail of outstanding stock option awards above. A summary of the status of exercisable stock option awards as of December 31, 2017 , and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Exercisable options at January 1, 2017 137,860 $ 66.85 Expired (5,913 ) 66.97 Exercisable options at December 31, 2017 131,947 $ 66.85 6.0 $ — DIRECTOR AWARDS In connection with joining our Board of Directors, in January 2009 our outside directors at that time were granted an award of phantom common stock units, which were credited to an account established on behalf of each director and vested ratably over a three -year period with the final vesting in January 2012. Subsequent equity awards have been granted annually in May, or on a pro-rata basis as applicable, to our outside directors in the form of phantom common stock units as part of their annual compensation, which are credited to their accounts. These awards vest ratably over a one -year period. These accounts will be credited with additional phantom common stock units equal in value to dividends paid, if any, on the same amount of common stock. Upon separation from service as a director, the vested portion of the phantom common stock units held by the director in a stock unit account are converted to cash based upon the then market price of the common stock and paid to the director. Due to its cash-settlement feature, we account for these awards as liabilities rather than equity and recognize the equity-based compensation expense or income at the end of each reporting period based on the portion of the award that is vested and the increase or decrease in the value of our common stock. We recorded director equity-based compensation benefit totaling $2.8 million for the year ended December 31, 2017 , compensation expense totaling $4.8 million for the year ended December 31, 2016 , and compensation benefit totaling $4.1 million for the year ended December 31, 2015 . At December 31, 2017 , the liability amounts associated with director equity-based compensation included in "Other long-term obligations" and "Accounts payable and accrued liabilities" on our Consolidated Balance Sheet were $3.6 million and $2.4 million , respectively. At December 31, 2016 , the liability amounts associated with director equity-based compensation in "Other long-term obligations" and "Accounts payable and accrued liabilities" on our Consolidated Balance Sheet were $7.9 million and $3.2 million , respectively.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The estimated fair values of our financial instruments as of our balance sheet dates are presented below: December 31, 2017 2016 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Cash and cash equivalents (Level 1) $ 15,738 $ 15,738 $ 23,001 $ 23,001 Borrowings under revolving credit facilities (Level 2) 155,000 154,882 135,000 135,000 Long-term debt (Level 2) 575,000 569,250 575,000 567,875 Accounting guidance establishes a framework for measuring the fair value of financial instruments, providing a hierarchy 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, or “Level 1” measurements, followed by quoted prices of similar assets or observable market data considering the assets' underlying maturities, or “Level 2” measurements, and the lowest priority to unobservable inputs, or “Level 3” measurements. The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used should seek to maximize the use of observable inputs and minimize the use of unobservable inputs. Cash and cash equivalents, borrowings under the revolving credit facilities and long-term debt are the only items measured at fair value on a recurring basis. We do not have any financial assets measured at fair value on a nonrecurring basis. Nonfinancial assets measured at fair value on a nonrecurring basis include items such as long-lived assets held and used that are measured at fair value resulting from impairment, if deemed necessary.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Additional information [Abstract]
Commitments and Contingencies	Commitments and Contingencies LEASE COMMITMENTS Our operating leases cover manufacturing, office, warehouse and distribution space, paperboard sheeting facilities, equipment and vehicles, which expire at various dates through 2029 . We have capital leases related to our North Carolina converting and manufacturing facilities as well as various office equipment. As leases expire, it can be expected that, in the normal course of business, certain leases will be renewed or replaced. As of December 31, 2017 , under current operating and capital lease contracts, we had future minimum lease payments as follows: (In thousands) Capital Operating 2018 $ 2,649 $ 12,074 2019 2,697 9,692 2020 2,662 8,808 2021 2,710 7,764 2022 2,643 7,416 Thereafter 24,179 29,586 Total future minimum lease payments $ 37,540 $ 75,340 Less interest portion (15,442 ) Present value of future minimum lease payments $ 22,098 Rent expense for operating leases was $12.6 million , $14.3 million and $14.8 million for the years ended December 31, 2017 , 2016 and 2015 , respectively.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information We are organized in two reportable operating segments: Consumer Products and Pulp and Paperboard. The following is a tabular presentation of business segment information for each of the past three years. Corporate information is included to reconcile segment data to the financial statements. (In thousands) 2017 2016 2015 Segment net sales: Consumer Products $ 941,907 $ 988,380 $ 959,894 Pulp and Paperboard 788,501 746,383 792,507 Total segment net sales $ 1,730,408 $ 1,734,763 $ 1,752,401 Operating income: Consumer Products 1 $ 28,616 $ 67,916 $ 55,704 Pulp and Paperboard 98,508 112,732 120,861 127,124 180,648 176,565 Corporate 2 (54,796 ) (69,331 ) (52,895 ) Income from operations $ 72,328 $ 111,317 $ 123,670 Depreciation and amortization: Consumer Products 3 $ 65,007 $ 59,375 $ 54,595 Pulp and Paperboard 34,474 26,741 27,204 Corporate 5,509 4,974 2,933 Total depreciation and amortization $ 104,990 $ 91,090 $ 84,732 Assets: Consumer Products $ 1,069,876 $ 1,031,563 $ 1,046,170 Pulp and Paperboard 645,353 586,687 423,694 1,715,229 1,618,250 1,469,864 Corporate 87,023 66,092 57,505 Total assets $ 1,802,252 $ 1,684,342 $ 1,527,369 Capital expenditures: Consumer Products $ 112,597 $ 47,079 $ 55,594 Pulp and Paperboard 74,616 104,113 67,929 187,213 151,192 123,523 Corporate 11,472 4,485 10,581 Total capital expenditures $ 198,685 $ 155,677 $ 134,104 1 Included in Consumer Products operating income are costs associated with the March 31, 2017 Oklahoma City facility closure. For the twelve months ended December 31, 2017, these costs include $4.3 million of loss on the write-down of assets to their held for sale value and $3.2 million of expenses associated with the execution of a sublease for the facility. For the twelve months ended December 31, 2016 and 2015, Consumer Products operating income includes gains on divested assets of $1.8 million and $1.3 million , respectively. 2 Corporate expenses for 2016 include $2.7 million of expenses associated with the acquisition of Manchester Industries. Operating results subsequent to the acquisition of Manchester are included in the Pulp and Paperboard segment. Corporate expenses for 2016 also include a $3.5 million settlement accounting charge associated with a pension lump sum buyout for term-vested participants. 3 Depreciation and amortization expense for the Consumer Products segment for the twelve months ended December 31, 2017 and 2016 includes accelerated depreciation of $3.7 million and $1.3 million , respectively, associated with the Oklahoma City facility closure. Our manufacturing facilities and all other assets are located within the continental United States. We sell and ship our products to customers in many foreign countries. Geographic information regarding our net sales is summarized as follows: (In thousands) 2017 2016 2015 United States $ 1,650,066 $ 1,663,231 $ 1,653,208 Japan 48,604 44,970 59,463 Canada 12,106 6,831 6,896 Korea 7,124 5,260 10,016 Australia 4,255 4,790 5,578 Other foreign countries 8,253 9,681 17,240 Total net sales $ 1,730,408 $ 1,734,763 $ 1,752,401

Financial Results by Quarter

Financial Results by Quarter	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Financial Results by Quarter	Financial Results by Quarter (Unaudited) Three Months Ended (In thousands— except per-share amounts) March 31, June 30, September 30, December 31, 2017 2016 2017 2016 2017 2016 2017 2016 Net sales $ 437,525 $ 437,204 $ 429,663 $ 436,671 $ 426,504 $ 435,320 $ 436,716 $ 425,568 Costs and expenses: Cost of sales (387,030 ) (368,647 ) (380,733 ) (361,851 ) (386,581 ) (396,605 ) (375,277 ) (368,524 ) Selling, general and administrative expenses (29,937 ) (30,795 ) (29,265 ) (34,655 ) (34,472 ) (29,435 ) (34,785 ) (32,934 ) Total operating costs and expenses (416,967 ) (399,442 ) (409,998 ) (396,506 ) (421,053 ) (426,040 ) (410,062 ) (401,458 ) Income from operations 20,558 37,762 19,665 40,165 5,451 9,280 26,654 24,110 Net earnings $ 7,515 $ 18,446 $ 8,037 $ 20,864 $ 863 $ 901 $ 80,924 $ 9,343 Net earnings per common share Basic $ 0.46 $ 1.05 $ 0.49 $ 1.22 $ 0.05 $ 0.05 $ 4.92 $ 0.56 Diluted 0.45 1.05 0.48 1.21 0.05 0.05 4.88 0.56

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Supplemental Guarantor Financial Information	Supplemental Guarantor Financial Information All of our directly and indirectly owned, domestic subsidiaries guarantee the 2013 Notes on a joint and several basis. There are no significant restrictions on the ability of the guarantor subsidiaries to make distributions to Clearwater Paper, the issuer of the 2013 Notes. The following tables present the results of operations, financial position and cash flows of Clearwater Paper and its subsidiaries, the guarantor and non-guarantor entities, and the eliminations necessary to arrive at the information for Clearwater Paper on a consolidated basis. We acquired Manchester Industries on December 16, 2016 and their results of operations, financial position and cash flows are included below as a guarantor entity. Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2017 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,707,283 $ 242,222 $ (219,097 ) $ 1,730,408 Cost and expenses: Cost of sales (1,524,925 ) (219,931 ) 215,235 (1,529,621 ) Selling, general and administrative expenses (97,989 ) (30,470 ) — (128,459 ) Total operating costs and expenses (1,622,914 ) (250,401 ) 215,235 (1,658,080 ) Income (loss) from operations 84,369 (8,179 ) (3,862 ) 72,328 Interest expense, net (30,820 ) (554 ) — (31,374 ) Earnings (loss) before income taxes 53,549 (8,733 ) (3,862 ) 40,954 Income tax benefit 34,250 20,644 1,491 56,385 Equity in earnings of subsidiary 11,911 — (11,911 ) — Net earnings $ 99,710 $ 11,911 $ (14,282 ) $ 97,339 Other comprehensive income, net of tax 7,770 — — 7,770 Comprehensive income $ 107,480 $ 11,911 $ (14,282 ) $ 105,109 Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2016 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,685,327 $ 287,952 $ (238,516 ) $ 1,734,763 Cost and expenses: Cost of sales (1,468,691 ) (263,577 ) 236,641 (1,495,627 ) Selling, general and administrative expenses (113,766 ) (14,053 ) — (127,819 ) Total operating costs and expenses (1,582,457 ) (277,630 ) 236,641 (1,623,446 ) Income from operations 102,870 10,322 (1,875 ) 111,317 Interest expense, net (30,462 ) (189 ) — (30,651 ) Earnings before income taxes 72,408 10,133 (1,875 ) 80,666 Income tax provision (26,966 ) (4,802 ) 656 (31,112 ) Equity in earnings of subsidiary 5,331 — (5,331 ) — Net earnings $ 50,773 $ 5,331 $ (6,550 ) $ 49,554 Other comprehensive income, net of tax 3,795 — — 3,795 Comprehensive income $ 54,568 $ 5,331 $ (6,550 ) $ 53,349 Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2015 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,683,890 $ 291,270 $ (222,759 ) $ 1,752,401 Cost and expenses: Cost of sales (1,458,121 ) (277,487 ) 222,759 (1,512,849 ) Selling, general and administrative expenses (108,414 ) (7,468 ) — (115,882 ) Total operating costs and expenses (1,566,535 ) (284,955 ) 222,759 (1,628,731 ) Income from operations 117,355 6,315 — 123,670 Interest expense, net (31,067 ) (115 ) — (31,182 ) Earnings before income taxes 86,288 6,200 — 92,488 Income tax provision (32,371 ) (3,724 ) (410 ) (36,505 ) Equity in earnings of subsidiary 2,476 — (2,476 ) — Net earnings $ 56,393 $ 2,476 $ (2,886 ) $ 55,983 Other comprehensive income, net of tax 15,315 — — 15,315 Comprehensive income $ 71,708 $ 2,476 $ (2,886 ) $ 71,298 Clearwater Paper Corporation Consolidating Balance Sheet At December 31, 2017 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total ASSETS Current assets: Cash and cash equivalents $ 15,738 $ — $ — $ 15,738 Receivables, net 125,001 17,064 — 142,065 Taxes receivable 20,242 40 — 20,282 Inventories 228,311 41,594 (3,862 ) 266,043 Other current assets 8,587 74 — 8,661 Total current assets 397,879 58,772 (3,862 ) 452,789 Property, plant and equipment, net 936,659 114,323 — 1,050,982 Goodwill 244,161 — — 244,161 Intangible assets, net 2,089 30,453 — 32,542 Intercompany receivable (payable) (2,807 ) (1,055 ) 3,862 — Investment in subsidiary 157,000 — (157,000 ) — Other assets, net 21,413 2,696 (2,331 ) 21,778 TOTAL ASSETS $ 1,756,394 $ 205,189 $ (159,331 ) $ 1,802,252 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Borrowings under revolving credit facilities $ 155,000 $ — $ — $ 155,000 Accounts payable and accrued liabilities 235,439 21,182 — 256,621 Current liability for pensions and other postretirement employee benefits 7,631 — — 7,631 Total current liabilities 398,070 21,182 — 419,252 Long-term debt 570,524 — — 570,524 Liability for pensions and other postretirement employee benefits 72,469 — — 72,469 Other long-term obligations 43,275 — — 43,275 Accrued taxes 1,928 842 — 2,770 Deferred tax liabilities 94,694 26,165 (2,331 ) 118,528 TOTAL LIABILITES 1,180,960 48,189 (2,331 ) 1,226,818 Accumulated other comprehensive loss, net of tax (43,983 ) — — (43,983 ) Stockholders’ equity excluding 619,417 157,000 (157,000 ) 619,417 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 1,756,394 $ 205,189 $ (159,331 ) $ 1,802,252 Clearwater Paper Corporation Consolidating Balance Sheet At December 31, 2016 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total ASSETS Current assets: Cash and cash equivalents $ 19,586 $ 3,415 $ — $ 23,001 Receivables, net 130,098 27,252 (10,276 ) 147,074 Taxes receivable 15,143 35 (5,469 ) 9,709 Inventories 208,472 51,432 (1,875 ) 258,029 Other current assets 8,161 521 — 8,682 Total current assets 381,460 82,655 (17,620 ) 446,495 Property, plant and equipment, net 802,064 143,264 — 945,328 Goodwill 244,283 — — 244,283 Intangible assets, net 3,135 37,350 — 40,485 Intercompany receivable (payable) 30,034 (31,909 ) 1,875 — Investment in subsidiary 145,089 — (145,089 ) — Other assets, net 8,433 2,853 (3,535 ) 7,751 TOTAL ASSETS $ 1,614,498 $ 234,213 $ (164,369 ) $ 1,684,342 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Borrowings under revolving credit facilities $ 135,000 $ — $ — $ 135,000 Accounts payable and accrued liabilities 202,187 37,257 (15,745 ) 223,699 Current liability for pensions and other postretirement employee benefits 7,821 — — 7,821 Total current liabilities 345,008 37,257 (15,745 ) 366,520 Long-term debt 569,755 — — 569,755 Liability for pensions and other postretirement employee benefits 81,812 — — 81,812 Other long-term obligations 41,424 352 — 41,776 Accrued taxes 1,614 820 — 2,434 Deferred tax liabilities 105,012 50,695 (3,535 ) 152,172 TOTAL LIABILITIES 1,144,625 89,124 (19,280 ) 1,214,469 Accumulated other comprehensive loss, net of tax (51,753 ) — — (51,753 ) Stockholders’ equity excluding accumulated other comprehensive loss 521,626 145,089 (145,089 ) 521,626 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 1,614,498 $ 234,213 $ (164,369 ) $ 1,684,342 Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2017 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 99,710 $ 11,911 $ (14,282 ) $ 97,339 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 76,862 28,128 — 104,990 Equity-based compensation expense 3,620 — — 3,620 Deferred taxes (16,957 ) (23,632 ) — (40,589 ) Employee benefit plans (4,371 ) — — (4,371 ) Deferred issuance costs on debt 1,199 — — 1,199 Disposal of plant and equipment, net 512 3,541 — 4,053 Other non-cash activity 1,750 — — 1,750 Changes in working capital 8,776 5,529 7,456 21,761 Change in taxes receivable, net (5,099 ) (5 ) (5,469 ) (10,573 ) Other, net 1,585 (3,094 ) — (1,509 ) Net cash flows from operating activities 167,587 22,378 (12,295 ) 177,670 CASH FLOWS FROM INVESTING ACTIVITIES Additions to property, plant and equipment (193,864 ) (5,884 ) — (199,748 ) Proceeds from sale of assets 283 668 — 951 Net cash flows from investing activities (193,581 ) (5,216 ) — (198,797 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (4,875 ) — — (4,875 ) Borrowings on revolving credit facilities 298,308 — — 298,308 Repayments of borrowings on revolving credit facilities' (278,308 ) — — (278,308 ) Investment from (to) parent 8,282 (20,577 ) 12,295 — Payment of tax withholdings on equity- based payment arrangements (1,127 ) — — (1,127 ) Other, net (134 ) — — (134 ) Net cash flows from financing activities 22,146 (20,577 ) 12,295 13,864 Decrease in cash and cash equivalents (3,848 ) (3,415 ) — (7,263 ) Cash and cash equivalents at beginning of period 19,586 3,415 — 23,001 Cash and cash equivalents at end of period $ 15,738 $ — $ — $ 15,738 Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2016 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 50,773 $ 5,331 $ (6,550 ) $ 49,554 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 68,496 22,594 — 91,090 Equity-based compensation expense 12,385 — — 12,385 Deferred taxes 18,860 605 (1,138 ) 18,327 Employee benefit plans (1,979 ) — — (1,979 ) Deferred issuance costs on debt 1,242 — — 1,242 Disposal of plant and equipment, net 781 600 — 1,381 Other non-cash activity 740 18 — 758 Changes in working capital, net of acquisition (642 ) 774 (3,594 ) (3,462 ) Change in taxes receivable, net 1,078 (1,405 ) 5,469 5,142 Excess tax benefits from equity-based payment arrangements (312 ) — — (312 ) Other, net (1,592 ) (921 ) 1,138 (1,375 ) Net cash flows from operating activities 149,830 27,596 (4,675 ) 172,751 CASH FLOWS FROM INVESTING ACTIVITIES Change in short-term investments, net 250 — — 250 Additions to property, plant and equipment (145,579 ) (9,770 ) — (155,349 ) Acquisition of Manchester Industries, net of cash acquired (67,443 ) — — (67,443 ) Proceeds from the sale of assets — 36 — 36 Net cash flows from investing activities (212,772 ) (9,734 ) — (222,506 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (65,327 ) — — (65,327 ) Borrowings on revolving credit facilities 1,273,959 — — 1,273,959 Repayments of borrowings on revolving credit facilities' (1,138,959 ) — — (1,138,959 ) Investment from (to) parent 9,772 (14,447 ) 4,675 — Payments for debt issuance costs (1,906 ) — — (1,906 ) Payment of tax withholdings on equity-based payment arrangements (933 ) — — (933 ) Excess tax benefits from equity-based payment arrangements 312 — — 312 Net cash flows from financing activities 76,918 (14,447 ) 4,675 67,146 Increase in cash and cash equivalents 13,976 3,415 — 17,391 Cash and cash equivalents at beginning of period 5,610 — — 5,610 Cash and cash equivalents at end of period $ 19,586 $ 3,415 $ — $ 23,001 Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2015 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 56,393 $ 2,476 $ (2,886 ) $ 55,983 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 65,078 19,654 — 84,732 Equity-based compensation expense 4,557 — — 4,557 Deferred taxes 9,944 3,178 2,959 16,081 Employee benefit plans 3,011 — — 3,011 Deferred issuance costs on debt 928 — — 928 Disposal of plant and equipment, net 1,587 (95 ) — 1,492 Other non-cash activities (1,028 ) 8 — (1,020 ) Changes in working capital, net 11,809 3,032 — 14,841 Change in taxes receivable, net (9,461 ) (14,388 ) 10,253 (13,596 ) Excess tax benefits from equity-based payment arrangements (1,433 ) — — (1,433 ) Funding of qualified pension plans (3,179 ) — — (3,179 ) Other, net (1,591 ) (1,131 ) — (2,722 ) Net cash flows from operating activities 136,615 12,734 10,326 159,675 CASH FLOWS FROM INVESTING ACTIVITIES Change in short-term investments, net 49,750 — — 49,750 Additions to property, plant and equipment (121,720 ) (7,182 ) — (128,902 ) Proceeds from sale of assets — 604 — 604 Net cash flows from investing activities (71,970 ) (6,578 ) — (78,548 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (99,990 ) — — (99,990 ) Investment from (to) parent 16,482 (6,156 ) (10,326 ) — Payment of tax withholdings on equity-based payment arrangements (4,152 ) — — (4,152 ) Excess tax benefits from equity-based payment arrangements 1,433 — — 1,433 Other, net (139 ) — — (139 ) Net cash flows from financing activities (86,366 ) (6,156 ) (10,326 ) (102,848 ) Decrease in cash and cash equivalents (21,721 ) — — (21,721 ) Cash and cash equivalents at beginning of period 27,331 — — 27,331 Cash and cash equivalents at end of period $ 5,610 $ — $ — $ 5,610

Business Interruption and Insur

Business Interruption and Insurance Recovery (Notes)	12 Months Ended
	Dec. 31, 2017
Business Interruption and Insurance Recovery [Abstract]
Business Insurance Recoveries [Text Block]	NOTE 18 Business Interruption and Insurance Recovery On July 6, 2016, our Lewiston, Idaho facility experienced an electrical incident that caused a complete plant-wide power outage. Power was restored in approximately 18 hours. However, damage to certain equipment limited pulping operations throughout the remainder of July. In addition to repair costs, we incurred other various costs, including incremental pulp replacement costs, incremental natural gas costs, lost electrical generation and increased labor, chemical and wood costs. We maintain property and business interruption insurance and filed a claim with our insurance provider to recover the cost of repairs to the equipment and estimated lost profits due to the disruption of the operations during the repair period. All associated costs and insurance recoveries were recorded in "Cost of sales" in our Consolidated Statement of Operations and included in the "Net earnings" line in our Consolidated Statement of Cash Flows. The insurance claim for this event totaled $8.5 million . The claim was settled in its entirety in September 2016, and, net of the policy deductible and certain exclusions totaling $3.5 million , we received $5.0 million from our property insurance provider as final payment of the claim. On November 14, 2016, we experienced a fire at our Las Vegas, Nevada facility. There was minimal disruption to the converting operations at that facility, however certain paper machine equipment was damaged and we incurred approximately 17 days of paper machine downtime while repairs were being made. We were unable to produce through-air-dried parent rolls during this period at the Las Vegas facility. We were able to replace a portion of this lost production capacity by shipping parent rolls from our Shelby, North Carolina facility, in addition to making open market purchases. We maintain property and business interruption insurance and filed a claim with our insurance provider to recover the cost of repairs to the equipment and estimated lost profits due to the disruption of the operations during the repair period. The insurance claim for this event, net of policy deductible, was $2.9 million , of which $1.5 million was recorded in the fourth quarter of 2016 and $1.4 million was recorded in the first quarter of 2017. All associated costs and insurance recoveries have been recorded in "Cost of sales" in our Consolidated Statements of Operations and included in the "Net earnings" line in our Consolidated Statement of Cash Flows. On January 28, 2017, there was a fire at our Shelby, North Carolina facility warehouse. Although the building sustained minimal damage, the smoke and water damage to raw material and finished goods inventory was more significant. Operations were impacted during the clean-up and repair period. We filed a claim with our insurance providers to recover the cost of repairs to the equipment and estimated lost profits and inventory due to the disruption of the operations during the repair and cleanup period. Net of policy deductibles, the insurance claim for this event totaled $2.9 million , and was settled in its entirety in the first quarter of 2017. All associated costs and insurance recoveries have been recorded in "Cost of sales" in our Consolidated Statements of Operations and included in the "Net earnings" line in our Consolidated Statement of Cash Flows.

Summary of Significant Accout31

Summary of Significant Accouting Policies Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
SIGNIFICANT ESTIMATES	SIGNIFICANT ESTIMATES The preparation of financial statements in conformity with accounting principles generally accepted in the U.S., which we refer to in this report as GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Significant areas requiring the use of estimates and measurement of uncertainty include determination of valuation for deferred tax assets, uncertain income tax positions, assessment of impairment of long-lived assets and goodwill, assessment of environmental matters, allocation of purchase price and fair value estimates for business combinations, equity-based compensation and pension and postretirement obligation assumptions. Actual results could differ from those estimates and assumptions.
Cash and Cash Equivalents, Policy [Policy Text Block]	CASH AND CASH EQUIVALENTS We consider all highly liquid instruments with maturities of three months or less to be cash equivalents. As of December 31, 2017 and 2016, we had cash and cash equivalents of $15.7 million and $23.0 million , respectively, on our Consolidated Balance Sheets.
TRADE ACCOUNTS RECEIVABLE	TRADE ACCOUNTS RECEIVABLE Trade accounts receivable are stated at the amount we expect to collect. Trade accounts receivable do not bear interest. The allowance for doubtful accounts is our best estimate of the losses we expect will result from the inability of our customers to make required payments. We generally determine the allowance based on a combination of actual historical write-off experience and an analysis of specific customer accounts. As of December 31, 2017 and 2016 , we had allowances for doubtful accounts of $1.4 million and $1.5 million , respectively. Bad debt expense, net, charged to selling, general and administrative expenses during 2017 , 2016 and 2015 was $0.2 million , $0.7 million , and $0.2 million , respectively. All other activity impacting the allowance for doubtful accounts was immaterial for all periods.
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are stated at cost, including assets acquired under capital lease obligations and any interest costs capitalized, less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method. Estimated useful lives generally range from 10 to 40 years for land improvements; 10 to 40 years for buildings and improvements; 5 to 25 years for machinery and equipment; and 2 to 15 years for office and other equipment. Assets we acquire through business combinations have estimated lives that are typically shorter than the assets we construct or buy new. We review the carrying value of our property, plant and equipment for impairment when events or changes in circumstances indicate that the carrying amount of those assets may not be recoverable. An impairment of property, plant and equipment exists when the carrying value is not considered to be recoverable through future undiscounted cash flows from operations and the carrying value of the assets exceeds the estimated fair value. On March 31, 2017, we closed our Oklahoma City converting facility. For the twelve months ended December 31, 2017, we incurred $14.7 million of costs associated with this announced closure, which includes $3.7 million in accelerated depreciation on certain fixed assets. For the twelve months ended December 31, 2016, we incurred $1.7 million of costs associated with this announced closure, which includes $1.3 million in accelerated depreciation on certain fixed assets.
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	INTANGIBLE ASSETS We use estimates in determining and assigning the fair value of the useful lives of intangible assets, the amount and timing of related future cash flows and fair values of the related operations. Our intangible assets have definite lives and are amortized over their estimated useful lives. We assess our intangible assets for impairment annually and when events or changes in circumstances indicate that the carrying amount may not be recoverable. We recorded intangible assets as a result of our December 2016 acquisition of Manchester. See Note 7, "Goodwill and Intangible Assets" for further discussion.
GOODWILL AND INTANGIBLES	GOODWILL Goodwill from an acquisition represents the excess of the cost of a business acquired over the net of the amounts assigned to assets acquired, including identifiable intangible assets and liabilities assumed. We use estimates in determining and assigning the fair value of goodwill, including the amount and timing of related future cash flows and fair values of the related operations. Goodwill is not amortized but is tested for impairment annually as of November 1, as well as any time when events suggest impairment may have occurred. In the event the carrying value of the reporting unit in which our goodwill is assigned exceeds the estimated fair value of that reporting unit, an impairment loss would be recognized to the extent the carrying amount of the reporting unit exceeds its implied fair value. We recorded $229.5 million of goodwill in connection with our acquisition of Cellu Tissue in December 2010 . All of the recorded goodwill was assigned to our Consumer Products segment and reporting unit. As a result of the December 2014 sale of our Consumer Products segment's specialty business and mills, a portion of goodwill was allocated to the divested mills and included in our loss on divested assets. We recorded $35.1 million of goodwill in connection with our acquisition of Manchester. The goodwill from this acquisition is included in our Pulp and Paperboard segment. See Note 8, "Goodwill and Intangible Assets" for further discussion.
PENSION AND OTHER POSTRETIREMENT PLANS, POLICY [Policy Text Block]	PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS The determination of pension plan expense and the requirements for funding our pension plans are based on a number of actuarial assumptions. Three critical assumptions are the discount rate applied to pension plan obligations, the rate of return on plan assets and mortality rates. For other postretirement employee benefit, or OPEB, plans, which provide certain health care and life insurance benefits to qualified retired employees, significant assumptions in determining OPEB income are the discount rate applied to benefit obligations, and mortality rates. We also participate in multiemployer defined benefit pension plans. We make contributions to these multiemployer plans, as well as make contributions to a trust fund established to provide retiree medical benefits for a portion of these employees. The discount rate used in the determination of pension benefit obligations and pension expense is determined based on a review of long-term high-grade bonds and management's expectations. To determine the expected long-term rate of return on pension assets, we employ a process that analyzes historical long-term returns for various investment categories, as measured by appropriate indices. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. An increase in the discount rate or the rate of expected return on plan assets, all other assumptions remaining the same, would decrease pension plan expense, and conversely, a decrease in either of these measures would increase plan expense. The actual rates of return on plan assets may vary significantly from the assumptions used because of unanticipated changes in financial markets. The estimated net loss and prior service cost (credit) for the defined benefit pension and OPEB plans is amortized from accumulated other comprehensive loss into net periodic cost (benefit) in accordance with current accounting guidance. Net periodic pension and OPEB expenses are included in “Cost of sales” and “Selling, general and administrative expenses” in the Consolidated Statements of Operations. The expense is allocated to all business segments. In accordance with current accounting guidance governing defined benefit pension and other postretirement plans, at December 31, 2017 and 2016 , long-term assets are recorded for overfunded single-employer plans and liabilities are recorded for underfunded single-employer plans. The funded status of a benefit plan is measured as the difference between plan assets at fair value and the projected benefit obligation. For underfunded single-employer plans, the estimated liability to be payable in the next twelve months is recorded as a current liability, with the remaining portion recorded as a long-term liability.
INCOME TAXES	INCOME TAXES Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the consolidated financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The benefits of uncertain tax positions are recorded in our consolidated financial statements only after determining a more-likely-than-not probability that the uncertain tax positions will withstand challenge, if any, from tax authorities. When facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate .
REVENUE RECOGNITION	REVENUE RECOGNITION We recognize net sales when there is persuasive evidence of a sales agreement, the price to the customer is fixed and determinable, collection is reasonably assured, and title and the risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed. Revenue is recognized at shipment for sales when shipping terms are free on board, or FOB, shipping point. For sales where shipping terms are FOB destination, revenue is recognized when the goods are received by the customer. Revenue from both domestic and foreign sales of our products can involve shipping terms of either FOB shipping point or FOB destination or other shipping terms, depending upon the sales agreement with the customer. We had one customer in the Consumer Products segment, the Kroger Company, that accounted for approximately 15.3% of our total company net sales in 2017, approximately 13.4% of our total company net sales in 2016, and approximately 12.3% of our total company net sales in 2015. We provide for trade promotions, customer cash discounts, customer returns and other deductions as reductions to net sales in the same period as the related revenues are recognized. Provisions for these items are determined based on historical experience or specific customer arrangements. Revenue is recognized net of any sales taxes collected. Sales taxes, when collected, are recorded as a current liability and remitted to the appropriate governmental entities.
ENVIRONMENTAL	ENVIRONMENTAL As part of our corporate policy, we have an ongoing process to monitor, report on and comply with environmental requirements. Based on this ongoing process, accruals for environmental liabilities that are not within the scope of specific authoritative guidance related to accounting for asset retirement obligations or conditional asset retirement obligations are established in accordance with guidance related to accounting for contingencies. We estimate our environmental liabilities based on various assumptions and judgments, the specific nature of which varies in light of the particular facts and circumstances surrounding each environmental liability. These estimates typically reflect assumptions and judgments as to the probable nature, magnitude and timing of required investigation, remediation and monitoring activities and the probable cost of these activities. Currently, we are not aware of any material environmental liabilities and have accrued only for specific costs related to environmental matters that we have determined are probable and for which an amount can be reasonably estimated. Fees for professional services associated with environmental and legal issues are expensed as incurred.
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY On December 15, 2015, we announced that our Board of Directors had approved a stock repurchase program authorizing the repurchase of up to $100 million of our common stock. The repurchase program authorizes purchases of our common stock from time to time through open market purchases, negotiated transactions or other means, including accelerated stock repurchases and 10b5-1 trading plans in accordance with applicable securities laws and other restrictions. We have no obligation to repurchase stock under this program and may suspend or terminate the program at any time. In total, we have repurchased 1,440,696 shares of our outstanding common stock pursuant to the repurchase program, of which 84,750 shares were repurchased during 2017 at an average price of $57.53 per share. As of December 31, 2017, we had up to $29.8 million of authorization remaining pursuant to this stock repurchase program. On December 15, 2014, we announced that our Board of Directors had approved a stock repurchase program authorizing the repurchase of up to $100 million of our common stock. We completed this program during the fourth quarter of 2015. In total, we repurchased 1,881,921 shares of our outstanding common stock at an average price of $53.13 per share under this program. During 2017, we retired 7,821,005 treasury shares. The impact of this retirement was reflected within the stockholders' equity line items on our Consolidated Balance Sheet.
DERIVATIVES	DERIVATIVES We had no activity during the years ended December 31, 2017 , 2016 and 2015 that required hedge or derivative accounting treatment. However, to partially mitigate our exposure to market risk for changes in utility commodity pricing, we use firm price contracts to supply a portion of the natural gas requirements for our manufacturing facilities. As of December 31, 2017 , these contracts covered approximately 17% of the expected average monthly requirements for 2018, including approximately 30% of the expected average monthly requirements for the first quarter. For the years ended December 31, 2017 , 2016 and 2015 , approximately 28% , 45% , and 57% , respectively, of our natural gas volumes were supplied through firm price contracts. These contracts qualify for treatment as “normal purchases or normal sales” under authoritative guidance and thus require no mark-to-market adjustment.

Inventories Inventories (Polici

Inventories Inventories (Policies)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	At December 31, 2017 , our inventories are stated at the lower of net realizable value or current average cost using the average cost method.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2017
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	We allocated the purchase price to the net assets of Manchester Industries acquired in the acquisition based on our estimates of the fair value of assets and liabilities as follows: (in thousands) Amount Current assets $ 22,046 Property, plant and equipment 6,967 Goodwill 35,074 Intangible assets 25,472 Assets acquired 89,559 Current liabilities 5,403 Deferred tax liabilities 12,491 Liabilities assumed 17,894 Net assets acquired $ 71,665

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	December 31, (In thousands) 2017 2016 Pulp, paperboard and tissue products $ 165,281 $ 154,460 Materials and supplies 85,987 82,005 Logs, pulpwood, chips and sawdust 14,775 21,564 $ 266,043 $ 258,029

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	December 31, (In thousands) 2017 2016 Machinery and equipment $ 2,124,701 $ 2,000,512 Buildings and improvements 340,042 328,251 Land improvements 49,908 47,844 Office and other equipment 46,467 40,051 Land 11,726 7,266 Construction in progress 114,424 103,429 $ 2,687,268 $ 2,527,353 Less accumulated depreciation and amortization (1,636,286 ) (1,582,025 ) $ 1,050,982 $ 945,328

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible assets at the balance sheet dates are comprised of the following : December 31, 2017 (Dollars in thousands, lives in years) Weighted Average Useful Life Historical Cost Accumulated Amortization Net Balance Customer relationships 9.3 $ 62,401 $ (34,061 ) $ 28,340 Trade names and trademarks 7.4 6,786 (3,000 ) 3,786 Non-compete agreements 5.0 574 (574 ) — Other intangibles 6.0 572 (156 ) 416 Total intangible assets $ 70,333 $ (37,791 ) $ 32,542 December 31, 2016 (Dollars in thousands, lives in years) Weighted Average Useful Life Historical Cost Accumulated Amortization Net Balance Customer relationships 9.3 $ 62,401 $ (27,364 ) $ 35,037 Trade names and trademarks 7.4 6,786 (1,972 ) 4,814 Non-compete agreements 5.0 574 (512 ) 62 Other Intangibles 6.0 572 — 572 Total intangible assets $ 70,333 $ (29,848 ) $ 40,485
Estimated Future Amortization Expense Related to Intangible Assets	As of December 31, 2017 , estimated future amortization expense related to intangible assets is as follows (in thousands): Years ending December 31, Amount 2018 $ 7,801 2019 7,801 2020 3,246 2021 2,917 2022 2,217 Thereafter 8,560 Total $ 32,542

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction	Earnings before income taxes is comprised of the following amounts: For The Years Ended December 31, (In thousands) 2017 2016 2015 United States $ 40,954 $ 80,666 $ 92,488
Provision (Benefit) for Income Taxes	The income tax (benefit) provision is comprised of the following: For The Years Ended December 31, (In thousands) 2017 2016 2015 Current Federal $ (16,729 ) $ 7,434 $ 15,579 State 933 5,351 4,855 Foreign — — (10 ) Total current (15,796 ) 12,785 20,424 Deferred Federal (36,810 ) 15,573 13,006 State (3,779 ) 2,754 3,075 Total deferred (40,589 ) 18,327 16,081 Income tax (benefit) provision $ (56,385 ) $ 31,112 $ 36,505
Income Tax Reconciliation	The income tax provision or benefit differs from the amount computed by applying the statutory federal income tax rate of 35.0% to earnings before income taxes due to the following: For The Years Ended December 31, (In thousands) 2017 2016 2015 Tax at the statutory rate $ 14,334 $ 28,233 $ 32,371 Federal rate change (70,055 ) — — State and local taxes, net of federal income tax impact (1,201 ) 3,046 3,753 Federal credits and net operating losses (3,158 ) (2,850 ) 3,593 Stock compensation 2,207 — — Other, net 1,488 2,683 (3,212 ) Income tax provision $ (56,385 ) $ 31,112 $ 36,505
Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities	The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were: (In thousands) 2017 2016 Deferred tax assets: Employee benefits $ 3,940 $ 6,255 Postretirement employee benefits 17,132 27,370 Incentive compensation 5,194 11,356 Inventories 7,959 8,859 Pensions 2,516 8,338 State credit carryforwards 11,752 8,369 State net operating losses 3,088 1,462 Other 1,949 3,774 Total deferred tax assets $ 53,530 $ 75,783 Valuation allowance (3,733 ) (4,407 ) Deferred tax assets, net of valuation allowance $ 49,797 $ 71,376 Deferred tax liabilities: Plant and equipment $ (153,885 ) $ (206,502 ) Intangible assets (7,577 ) (14,136 ) Total deferred tax liabilities (161,462 ) (220,638 ) Net deferred tax liabilities $ (111,665 ) $ (149,262 ) Net deferred tax assets (liabilities) consist of: (In thousands) 2017 2016 Non-current deferred tax assets 1 6,863 2,910 Non-current deferred tax liabilities (118,528 ) (152,172 ) Net non-current deferred tax liabilities (111,665 ) (149,262 ) Net deferred tax liabilities $ (111,665 ) $ (149,262 ) 1 Included in "Other assets, net" on our accompanying December 31, 2017 and 2016 Consolidated Balance Sheets.
Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in the Accrued Taxes line item in non-current liabilities	(In thousands) Gross Unrecognized Tax Benefits, Excluding Interest and Penalties Interest and Penalties Total Gross Unrecognized Tax Benefits Balance at December 31, 2015 $ 4,227 $ 221 $ 4,448 Change in prior year tax positions 619 36 655 Reductions as a result of a lapse of the applicable statute of limitations (234 ) (20 ) (254 ) Change in current year tax positions 291 — 291 Balance at December 31, 2016 $ 4,903 $ 237 $ 5,140 Change in prior year tax positions (1,149 ) 48 (1,101 ) Change in current year tax positions 320 — 320 Balance at December 31, 2017 $ 4,074 $ 285 $ 4,359

Accounts Payable and Accrued 38

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities December 31, (In thousands) 2017 2016 Trade accounts payable $ 169,293 $ 128,106 Accrued wages, salaries and employee benefits 41,979 49,871 Accrued interest 12,723 12,149 Accrued discounts and allowances 7,283 10,291 Accrued taxes other than income taxes payable 6,907 6,946 Accrued utilities 6,759 6,712 Other 11,677 9,624 $ 256,621 $ 223,699

Other Long-Term Obligations (Ta

Other Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Other Long Term Obligations [Abstract]
Other Long-Term Obligations	December 31, (In thousands) 2017 2016 Long-term lease obligations, net of current portion $ 26,460 $ 23,152 Deferred proceeds 5,576 9,013 Deferred compensation 5,023 7,219 Other 6,216 2,392 $ 43,275 $ 41,776

Reclassification out of Accum40

Reclassification out of Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Accumulated other comprehensive loss at the balance sheet dates is comprised of the following: (In thousands) Pension and Other Post Retirement Employee Benefit Plan Adjustments Balance at December 31, 2015 $ (55,548 ) Other comprehensive income before reclassifications 2 2,495 Amounts reclassified from accumulated other comprehensive loss 1,300 Other comprehensive income, net of tax 1 3,795 Balance at December 31, 2016 $ (51,753 ) Other comprehensive income before reclassifications 6,745 Amounts reclassified from accumulated other comprehensive loss 1,025 Other comprehensive income, net of tax 1 7,770 Balance at December 31, 2017 $ (43,983 ) 1 For the year ended December 31, 2017 , net periodic costs associated with our pension and other postretirement employee benefit, or OPEB, plans included in other comprehensive loss and reclassified from accumulated other comprehensive loss, or AOCL, included $9.2 million of net gain on plan assets, $3.3 million of actuarial loss amortization, and $1.5 million of prior service credit amortization, less total tax of $3.1 million . For the year ended December 31, 2016 , net periodic costs associated with our pension and OPEB plans included in other comprehensive income and reclassified from AOCL included $0.6 million of net gain on plan assets, $3.9 million of actuarial loss amortization, and $1.7 million of prior service credit amortization, less total tax of $1.2 million . These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” 2 Included in "Other comprehensive income before reclassifications" above for the twelve months ended December 31, 2016 is settlement expense of $3.5 million associated with the remeasurement of our salaried pension plan, which is discussed further in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” The settlement expense is net of tax totaling $1.4 million .

Savings, Pension and Other Po41

Savings, Pension and Other Postretirement Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans	The changes in benefit obligation, plan assets and funded status for company-sponsored benefit plans as of December 31 are as follows: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Benefit obligation at beginning of year $ 304,388 $ 318,444 $ 69,163 $ 71,672 Service cost 2,069 1,562 163 249 Interest cost 13,149 14,072 2,745 3,075 Plan settlements — (10,629 ) — — Actuarial losses (gains) 19,130 6,225 (1,254 ) 816 Benefits paid (20,922 ) (25,286 ) (5,689 ) (6,649 ) Benefit obligation at end of year 317,814 304,388 65,128 69,163 Fair value of plan assets at beginning of year 285,638 294,076 20 20 Actual return on plan assets 45,796 27,056 — — Employer contribution 454 421 5,689 6,649 Plan settlements — (10,629 ) — — Benefits paid (20,922 ) (25,286 ) (5,689 ) (6,649 ) Fair value of plan assets at end of year 310,966 285,638 20 20 Funded status at end of year $ (6,848 ) $ (18,750 ) $ (65,108 ) $ (69,143 )
Schedule of Amounts Recognized in Balance Sheet	Amounts recognized in the Consolidated Balance Sheets: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Non-current assets $ 8,144 $ 1,740 $ — $ — Current liabilities (441 ) (397 ) (7,190 ) (7,424 ) Non-current liabilities (14,551 ) (20,093 ) (57,918 ) (61,719 ) Net amount recognized $ (6,848 ) $ (18,750 ) $ (65,108 ) $ (69,143 )
Amounts Recognized (Pre-tax) in Accumulated Other Comprehensive Loss	mounts recognized in Accumulated Other Comprehensive Loss as of December 31 consist of: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2017 2016 Net loss (gain) $ 99,865 $ 117,640 $ (15,541 ) $ (20,906 ) Prior service cost (credit) — 8 (1,676 ) (3,211 ) Net amount recognized $ 99,865 $ 117,648 $ (17,217 ) $ (24,117 )
Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets	Information as of December 31 for certain pension plans included above with accumulated benefit obligations in excess of plan assets were as follows: (In thousands) 2017 2016 Projected benefit obligation $ 178,452 $ 170,716 Accumulated benefit obligation 178,452 170,716 Fair value of plan assets 163,460 150,226
Pre-tax Components of Net Periodic Cost	Pre-tax components of net periodic cost and other amounts recognized in Other Comprehensive Income (Loss) for the years ended December 31 were as follows: Net Periodic Cost: Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2015 2017 2016 2015 Service cost $ 2,069 $ 1,562 $ 1,244 $ 163 $ 249 $ 363 Interest cost 13,149 14,072 13,931 2,745 3,075 3,881 Expected return on plan assets (18,765 ) (19,389 ) (20,117 ) (1 ) (1 ) (1 ) Amortization of prior service cost (credit) 8 22 73 (1,535 ) (1,712 ) (2,178 ) Amortization of actuarial loss (gain) 9,874 11,463 12,619 (6,618 ) (7,566 ) — Settlement — 3,482 — — — — Net periodic cost $ 6,335 $ 11,212 $ 7,750 $ (5,246 ) $ (5,955 ) $ 2,065
Other Amounts Recognized in Other Comprehensive Income (Loss)	Other amounts recognized in Other Comprehensive Income (Loss): Pension Benefit Plans Other Postretirement Employee Benefit Plans (In thousands) 2017 2016 2015 2017 2016 2015 Net (gain) loss $ (7,901 ) $ (1,445 ) $ 15,942 $ (1,253 ) $ 818 $ (30,700 ) Amortization of prior service (cost) credit (8 ) (22 ) (73 ) 1,535 1,712 2,178 Amortization of actuarial (loss) gain (9,874 ) (11,463 ) (12,619 ) 6,618 7,566 — Settlement — (3,482 ) — — — — Total recognized in other comprehensive (income) loss $ (17,783 ) $ (16,412 ) $ 3,250 $ 6,900 $ 10,096 $ (28,522 ) Total recognized in net periodic cost and other comprehensive (income) loss $ (11,448 ) $ (5,200 ) $ 11,000 $ 1,654 $ 4,141 $ (26,457 )
Weighted Average Assumptions Used to Determine Benefit Obligation	Weighted average assumptions used to determine the benefit obligation as of December 31 were: Pension Benefit Plans Other Postretirement Employee Benefit Plans 2017 2016 2015 2017 2016 2015 Discount rate 3.90 % 4.45 % 4.70 % 3.95 % 4.30 % 4.50 % Weighted average assumptions used to determine the net periodic cost for the years ended December 31 were: Pension Benefit Plans Other Postretirement Employee Benefit Plans 2017 2016 2015 2017 2016 2015 Discount rate 4.45 % 4.70 % 4.25 % 4.30 % 4.50 % 4.15 % Expected return on plan assets 6.75 6.75 7.00 — — —
One Percentage Point Change in Health Care Cost Trend Rates	A one percentage point change in the health care cost trend rates would have the following effects: (In thousands) 1% Increase 1% Decrease Effect on total of service and interest cost components $ 193 $ (168 ) Effect on postretirement employee benefit obligation 4,150 (3,614 )
Investments at Fair Value for Company Sponsored Pension Benefit Plans within Fair Value Hierarchy	The following tables set forth by level, within the fair value hierarchy, the investments at fair value for our company-sponsored pension benefit plans: December 31, 2017 (In thousands) Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 2,010 $ — $ 2,010 Common and collective trust: Collective investment funds — 308,956 308,956 Total investments at fair value $ 2,010 $ 308,956 $ 310,966 December 31, 2016 (In thousands) Level 1 Investments measured at net asset value Total Cash and cash equivalents $ 2,002 $ — $ 2,002 Common and collective trusts: Collective investment funds — 283,636 283,636 Total investments at fair value $ 2,002 $ 283,636 $ 285,638
Long Term Asset Allocation Ranges	Assets are diversified among various asset classes, such as domestic equities, international equities, fixed income and cash. The long-term asset allocation ranges are as follows: Domestic equities 14%-22% International equities, including emerging markets 13%-22% Corporate bonds 50%-70% Liquid reserves 0%-5%
Schedule of Expected Benefit Payments	Estimated future benefit payments are as follows for the years indicated: (In thousands) Pension Benefit Plans Other Postretirement Employee Benefit Plans 2018 20,210 7,210 2019 20,372 6,700 2020 20,338 6,224 2021 20,278 5,182 2022 20,257 4,639 2023-2027 99,994 18,702
Multiemployer Defined Benefit Plans	Pension Fund EIN Plan Number PPA Zone Status 1 FIP/RP Status Pending/ Implemented Contributions (in thousands) Surcharge Imposed Expiration Date of Collective Bargaining Agreement 2017 2016 2017 2016 2015 IAM NPF 51-6031295 002 Green Green N/A $ 333 $ 335 $ 329 No 5/31/2018 PIUMPF 11-6166763 001 Red Red Implemented 5,815 5,679 5,631 No 8/31/2017 Total Contributions: $ 6,148 $ 6,014 $ 5,960 1 PIUMPF has been certified as in "Critical and Declining Status" for 2017 and 2016, under the provisions of the Multiemployer Pension Plan Reform Act of 2014.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share	The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share: December 31, 2017 2016 2015 Basic average common shares outstanding 1 16,464,286 17,000,599 18,762,451 Incremental shares due to: Restricted stock units 21,522 21,668 33,128 Performance shares 45,252 76,525 24,717 Stock options 24,866 7,648 — Diluted average common shares outstanding 16,555,926 17,106,440 18,820,296 Basic net earnings per common share $ 5.91 $ 2.91 $ 2.98 Diluted net earnings per common share 5.88 2.90 2.97 Anti-dilutive shares excluded from calculation 499,348 220,037 331,168

Equity-Based Compensation Pla43

Equity-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]	A summary of the status of exercisable stock option awards as of December 31, 2017 , and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Exercisable options at January 1, 2017 137,860 $ 66.85 Expired (5,913 ) 66.97 Exercisable options at December 31, 2017 131,947 $ 66.85 6.0 $ —
Employee Equity-Based Compensation Expense	Employee equity-based compensation expense was recognized as follows: (In thousands) 2017 2016 2015 Restricted stock units $ 1,618 $ 1,381 $ 2,116 Performance shares 2,283 3,311 4,408 Stock options 2,552 2,913 2,106 Total employee equity-based compensation $ 6,453 $ 7,605 $ 8,630 Related tax benefit $ 2,149 $ 2,767 $ 3,193
Summary of Status of Outstanding RSU Awards	A summary of the status of outstanding unvested RSU awards as of December 31, 2017 , 2016 , and 2015 , and changes during those years, is presented below: 2017 2016 2015 Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Unvested shares outstanding at January 1 54,460 $ 47.16 46,029 $ 60.17 93,254 $ 47.95 Granted 66,774 56.45 44,627 39.10 23,148 62.02 Vested (17,531 ) 62.75 (29,338 ) 55.16 (65,217 ) 43.86 Forfeited (9,232 ) 53.52 (6,858 ) 47.80 (5,156 ) 58.58 Unvested shares outstanding at December 31 94,471 50.22 54,460 47.16 46,029 60.17 Aggregate intrinsic value (in thousands) $ 4,289 $ 3,570 $ 2,096
Schedule of Share-based Compensation, Activity [Table Text Block]	A summary of the status of outstanding stock option awards as of December 31, 2017 , and changes during the year, is presented below: Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life (Years) Aggregate Intrinsic Value Outstanding options at 150,580 $ 66.84 $ 258 Granted 142,542 61.93 $ 20.82 Forfeited (15,429 ) 64.12 Outstanding options at 277,693 $ 64.47 $ — Granted 280,191 38.86 14.42 Forfeited (30,830 ) 47.79 Outstanding options at December 31, 2016 527,054 $ 51.83 $ 7,232 Granted 158,484 56.45 18.82 Forfeited (22,306 ) 50.74 Expired (5,913 ) 66.97 Outstanding options at December 31, 2017 2,017 657,319 $ 52.84 7.4 $ —
Assumption Used in Black-Scholes Option-Pricing Model to Estimate Fair Value of Stock Options	Volatility 30 % Risk-free interest rate 2.05 % Expected life-years 6.0 The fair value of performance share awards is estimated using a Monte Carlo simulation model. For performance shares granted in 2017 , the following assumptions were used in our Monte Carlo model: Closing price of stock on date of grant $ 56.75 Risk free rate 1.42 % Measurement period 3 years Volatility 35 %
Summary of Status of Outstanding Performance Share Awards	A summary of the status of outstanding performance share awards as of December 31, 2017 , 2016 , and 2015 , and changes during those years, is presented below: 2017 2016 2015 Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Shares Weighted Average Grant Date Fair Value Outstanding share awards at January 1 175,683 $ 62.26 92,563 $ 84.18 300,864 $ 59.77 Granted 33,907 58.58 93,397 39.70 47,513 62.05 Settled (87,491 ) 84.65 — — (245,525 ) 50.43 Forfeited (4,847 ) 47.61 (10,277 ) 54.55 (10,289 ) 73.61 Outstanding share awards at December 31 117,252 45.10 175,683 62.26 92,563 84.18 Aggregate intrinsic value (in thousands) $ 5,323 $ 11,516 $ 4,214

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of our financial instruments as of our balance sheet dates are presented below: December 31, 2017 2016 (In thousands) Carrying Amount Fair Value Carrying Amount Fair Value Cash and cash equivalents (Level 1) $ 15,738 $ 15,738 $ 23,001 $ 23,001 Borrowings under revolving credit facilities (Level 2) 155,000 154,882 135,000 135,000 Long-term debt (Level 2) 575,000 569,250 575,000 567,875

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Additional information [Abstract]
Future Minimum Commitments For Capital And Operating Leases	As of December 31, 2017 , under current operating and capital lease contracts, we had future minimum lease payments as follows: (In thousands) Capital Operating 2018 $ 2,649 $ 12,074 2019 2,697 9,692 2020 2,662 8,808 2021 2,710 7,764 2022 2,643 7,416 Thereafter 24,179 29,586 Total future minimum lease payments $ 37,540 $ 75,340 Less interest portion (15,442 ) Present value of future minimum lease payments $ 22,098

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Reportable Segments Information	The following is a tabular presentation of business segment information for each of the past three years. Corporate information is included to reconcile segment data to the financial statements. (In thousands) 2017 2016 2015 Segment net sales: Consumer Products $ 941,907 $ 988,380 $ 959,894 Pulp and Paperboard 788,501 746,383 792,507 Total segment net sales $ 1,730,408 $ 1,734,763 $ 1,752,401 Operating income: Consumer Products 1 $ 28,616 $ 67,916 $ 55,704 Pulp and Paperboard 98,508 112,732 120,861 127,124 180,648 176,565 Corporate 2 (54,796 ) (69,331 ) (52,895 ) Income from operations $ 72,328 $ 111,317 $ 123,670 Depreciation and amortization: Consumer Products 3 $ 65,007 $ 59,375 $ 54,595 Pulp and Paperboard 34,474 26,741 27,204 Corporate 5,509 4,974 2,933 Total depreciation and amortization $ 104,990 $ 91,090 $ 84,732 Assets: Consumer Products $ 1,069,876 $ 1,031,563 $ 1,046,170 Pulp and Paperboard 645,353 586,687 423,694 1,715,229 1,618,250 1,469,864 Corporate 87,023 66,092 57,505 Total assets $ 1,802,252 $ 1,684,342 $ 1,527,369 Capital expenditures: Consumer Products $ 112,597 $ 47,079 $ 55,594 Pulp and Paperboard 74,616 104,113 67,929 187,213 151,192 123,523 Corporate 11,472 4,485 10,581 Total capital expenditures $ 198,685 $ 155,677 $ 134,104 1 Included in Consumer Products operating income are costs associated with the March 31, 2017 Oklahoma City facility closure. For the twelve months ended December 31, 2017, these costs include $4.3 million of loss on the write-down of assets to their held for sale value and $3.2 million of expenses associated with the execution of a sublease for the facility. For the twelve months ended December 31, 2016 and 2015, Consumer Products operating income includes gains on divested assets of $1.8 million and $1.3 million , respectively. 2 Corporate expenses for 2016 include $2.7 million of expenses associated with the acquisition of Manchester Industries. Operating results subsequent to the acquisition of Manchester are included in the Pulp and Paperboard segment. Corporate expenses for 2016 also include a $3.5 million settlement accounting charge associated with a pension lump sum buyout for term-vested participants. 3 Depreciation and amortization expense for the Consumer Products segment for the twelve months ended December 31, 2017 and 2016 includes accelerated depreciation of $3.7 million and $1.3 million , respectively, associated with the Oklahoma City facility closure.
Summary of Geographic Information Regarding Net Sales	Geographic information regarding our net sales is summarized as follows: (In thousands) 2017 2016 2015 United States $ 1,650,066 $ 1,663,231 $ 1,653,208 Japan 48,604 44,970 59,463 Canada 12,106 6,831 6,896 Korea 7,124 5,260 10,016 Australia 4,255 4,790 5,578 Other foreign countries 8,253 9,681 17,240 Total net sales $ 1,730,408 $ 1,734,763 $ 1,752,401

Financial Results by Quarter Fi

Financial Results by Quarter Financial Results by Quarter (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Financial Results by Quarter	Financial Results by Quarter (Unaudited) Three Months Ended (In thousands— except per-share amounts) March 31, June 30, September 30, December 31, 2017 2016 2017 2016 2017 2016 2017 2016 Net sales $ 437,525 $ 437,204 $ 429,663 $ 436,671 $ 426,504 $ 435,320 $ 436,716 $ 425,568 Costs and expenses: Cost of sales (387,030 ) (368,647 ) (380,733 ) (361,851 ) (386,581 ) (396,605 ) (375,277 ) (368,524 ) Selling, general and administrative expenses (29,937 ) (30,795 ) (29,265 ) (34,655 ) (34,472 ) (29,435 ) (34,785 ) (32,934 ) Total operating costs and expenses (416,967 ) (399,442 ) (409,998 ) (396,506 ) (421,053 ) (426,040 ) (410,062 ) (401,458 ) Income from operations 20,558 37,762 19,665 40,165 5,451 9,280 26,654 24,110 Net earnings $ 7,515 $ 18,446 $ 8,037 $ 20,864 $ 863 $ 901 $ 80,924 $ 9,343 Net earnings per common share Basic $ 0.46 $ 1.05 $ 0.49 $ 1.22 $ 0.05 $ 0.05 $ 4.92 $ 0.56 Diluted 0.45 1.05 0.48 1.21 0.05 0.05 4.88 0.56

Supplemental Guarantor Financ48

Supplemental Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)	Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2017 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,707,283 $ 242,222 $ (219,097 ) $ 1,730,408 Cost and expenses: Cost of sales (1,524,925 ) (219,931 ) 215,235 (1,529,621 ) Selling, general and administrative expenses (97,989 ) (30,470 ) — (128,459 ) Total operating costs and expenses (1,622,914 ) (250,401 ) 215,235 (1,658,080 ) Income (loss) from operations 84,369 (8,179 ) (3,862 ) 72,328 Interest expense, net (30,820 ) (554 ) — (31,374 ) Earnings (loss) before income taxes 53,549 (8,733 ) (3,862 ) 40,954 Income tax benefit 34,250 20,644 1,491 56,385 Equity in earnings of subsidiary 11,911 — (11,911 ) — Net earnings $ 99,710 $ 11,911 $ (14,282 ) $ 97,339 Other comprehensive income, net of tax 7,770 — — 7,770 Comprehensive income $ 107,480 $ 11,911 $ (14,282 ) $ 105,109 Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2016 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,685,327 $ 287,952 $ (238,516 ) $ 1,734,763 Cost and expenses: Cost of sales (1,468,691 ) (263,577 ) 236,641 (1,495,627 ) Selling, general and administrative expenses (113,766 ) (14,053 ) — (127,819 ) Total operating costs and expenses (1,582,457 ) (277,630 ) 236,641 (1,623,446 ) Income from operations 102,870 10,322 (1,875 ) 111,317 Interest expense, net (30,462 ) (189 ) — (30,651 ) Earnings before income taxes 72,408 10,133 (1,875 ) 80,666 Income tax provision (26,966 ) (4,802 ) 656 (31,112 ) Equity in earnings of subsidiary 5,331 — (5,331 ) — Net earnings $ 50,773 $ 5,331 $ (6,550 ) $ 49,554 Other comprehensive income, net of tax 3,795 — — 3,795 Comprehensive income $ 54,568 $ 5,331 $ (6,550 ) $ 53,349 Clearwater Paper Corporation Consolidating Statement of Operations and Comprehensive Income (Loss) Twelve Months Ended December 31, 2015 (In thousands) Issuer Guarantor Eliminations Total Net sales $ 1,683,890 $ 291,270 $ (222,759 ) $ 1,752,401 Cost and expenses: Cost of sales (1,458,121 ) (277,487 ) 222,759 (1,512,849 ) Selling, general and administrative expenses (108,414 ) (7,468 ) — (115,882 ) Total operating costs and expenses (1,566,535 ) (284,955 ) 222,759 (1,628,731 ) Income from operations 117,355 6,315 — 123,670 Interest expense, net (31,067 ) (115 ) — (31,182 ) Earnings before income taxes 86,288 6,200 — 92,488 Income tax provision (32,371 ) (3,724 ) (410 ) (36,505 ) Equity in earnings of subsidiary 2,476 — (2,476 ) — Net earnings $ 56,393 $ 2,476 $ (2,886 ) $ 55,983 Other comprehensive income, net of tax 15,315 — — 15,315 Comprehensive income $ 71,708 $ 2,476 $ (2,886 ) $ 71,298
Condensed Consolidating Balance Sheet	Clearwater Paper Corporation Consolidating Balance Sheet At December 31, 2017 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total ASSETS Current assets: Cash and cash equivalents $ 15,738 $ — $ — $ 15,738 Receivables, net 125,001 17,064 — 142,065 Taxes receivable 20,242 40 — 20,282 Inventories 228,311 41,594 (3,862 ) 266,043 Other current assets 8,587 74 — 8,661 Total current assets 397,879 58,772 (3,862 ) 452,789 Property, plant and equipment, net 936,659 114,323 — 1,050,982 Goodwill 244,161 — — 244,161 Intangible assets, net 2,089 30,453 — 32,542 Intercompany receivable (payable) (2,807 ) (1,055 ) 3,862 — Investment in subsidiary 157,000 — (157,000 ) — Other assets, net 21,413 2,696 (2,331 ) 21,778 TOTAL ASSETS $ 1,756,394 $ 205,189 $ (159,331 ) $ 1,802,252 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Borrowings under revolving credit facilities $ 155,000 $ — $ — $ 155,000 Accounts payable and accrued liabilities 235,439 21,182 — 256,621 Current liability for pensions and other postretirement employee benefits 7,631 — — 7,631 Total current liabilities 398,070 21,182 — 419,252 Long-term debt 570,524 — — 570,524 Liability for pensions and other postretirement employee benefits 72,469 — — 72,469 Other long-term obligations 43,275 — — 43,275 Accrued taxes 1,928 842 — 2,770 Deferred tax liabilities 94,694 26,165 (2,331 ) 118,528 TOTAL LIABILITES 1,180,960 48,189 (2,331 ) 1,226,818 Accumulated other comprehensive loss, net of tax (43,983 ) — — (43,983 ) Stockholders’ equity excluding 619,417 157,000 (157,000 ) 619,417 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 1,756,394 $ 205,189 $ (159,331 ) $ 1,802,252 Clearwater Paper Corporation Consolidating Balance Sheet At December 31, 2016 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total ASSETS Current assets: Cash and cash equivalents $ 19,586 $ 3,415 $ — $ 23,001 Receivables, net 130,098 27,252 (10,276 ) 147,074 Taxes receivable 15,143 35 (5,469 ) 9,709 Inventories 208,472 51,432 (1,875 ) 258,029 Other current assets 8,161 521 — 8,682 Total current assets 381,460 82,655 (17,620 ) 446,495 Property, plant and equipment, net 802,064 143,264 — 945,328 Goodwill 244,283 — — 244,283 Intangible assets, net 3,135 37,350 — 40,485 Intercompany receivable (payable) 30,034 (31,909 ) 1,875 — Investment in subsidiary 145,089 — (145,089 ) — Other assets, net 8,433 2,853 (3,535 ) 7,751 TOTAL ASSETS $ 1,614,498 $ 234,213 $ (164,369 ) $ 1,684,342 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Borrowings under revolving credit facilities $ 135,000 $ — $ — $ 135,000 Accounts payable and accrued liabilities 202,187 37,257 (15,745 ) 223,699 Current liability for pensions and other postretirement employee benefits 7,821 — — 7,821 Total current liabilities 345,008 37,257 (15,745 ) 366,520 Long-term debt 569,755 — — 569,755 Liability for pensions and other postretirement employee benefits 81,812 — — 81,812 Other long-term obligations 41,424 352 — 41,776 Accrued taxes 1,614 820 — 2,434 Deferred tax liabilities 105,012 50,695 (3,535 ) 152,172 TOTAL LIABILITIES 1,144,625 89,124 (19,280 ) 1,214,469 Accumulated other comprehensive loss, net of tax (51,753 ) — — (51,753 ) Stockholders’ equity excluding accumulated other comprehensive loss 521,626 145,089 (145,089 ) 521,626 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 1,614,498 $ 234,213 $ (164,369 ) $ 1,684,342
Condensed Consolidating Statement of Cash Flows	Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2017 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 99,710 $ 11,911 $ (14,282 ) $ 97,339 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 76,862 28,128 — 104,990 Equity-based compensation expense 3,620 — — 3,620 Deferred taxes (16,957 ) (23,632 ) — (40,589 ) Employee benefit plans (4,371 ) — — (4,371 ) Deferred issuance costs on debt 1,199 — — 1,199 Disposal of plant and equipment, net 512 3,541 — 4,053 Other non-cash activity 1,750 — — 1,750 Changes in working capital 8,776 5,529 7,456 21,761 Change in taxes receivable, net (5,099 ) (5 ) (5,469 ) (10,573 ) Other, net 1,585 (3,094 ) — (1,509 ) Net cash flows from operating activities 167,587 22,378 (12,295 ) 177,670 CASH FLOWS FROM INVESTING ACTIVITIES Additions to property, plant and equipment (193,864 ) (5,884 ) — (199,748 ) Proceeds from sale of assets 283 668 — 951 Net cash flows from investing activities (193,581 ) (5,216 ) — (198,797 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (4,875 ) — — (4,875 ) Borrowings on revolving credit facilities 298,308 — — 298,308 Repayments of borrowings on revolving credit facilities' (278,308 ) — — (278,308 ) Investment from (to) parent 8,282 (20,577 ) 12,295 — Payment of tax withholdings on equity- based payment arrangements (1,127 ) — — (1,127 ) Other, net (134 ) — — (134 ) Net cash flows from financing activities 22,146 (20,577 ) 12,295 13,864 Decrease in cash and cash equivalents (3,848 ) (3,415 ) — (7,263 ) Cash and cash equivalents at beginning of period 19,586 3,415 — 23,001 Cash and cash equivalents at end of period $ 15,738 $ — $ — $ 15,738 Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2016 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 50,773 $ 5,331 $ (6,550 ) $ 49,554 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 68,496 22,594 — 91,090 Equity-based compensation expense 12,385 — — 12,385 Deferred taxes 18,860 605 (1,138 ) 18,327 Employee benefit plans (1,979 ) — — (1,979 ) Deferred issuance costs on debt 1,242 — — 1,242 Disposal of plant and equipment, net 781 600 — 1,381 Other non-cash activity 740 18 — 758 Changes in working capital, net of acquisition (642 ) 774 (3,594 ) (3,462 ) Change in taxes receivable, net 1,078 (1,405 ) 5,469 5,142 Excess tax benefits from equity-based payment arrangements (312 ) — — (312 ) Other, net (1,592 ) (921 ) 1,138 (1,375 ) Net cash flows from operating activities 149,830 27,596 (4,675 ) 172,751 CASH FLOWS FROM INVESTING ACTIVITIES Change in short-term investments, net 250 — — 250 Additions to property, plant and equipment (145,579 ) (9,770 ) — (155,349 ) Acquisition of Manchester Industries, net of cash acquired (67,443 ) — — (67,443 ) Proceeds from the sale of assets — 36 — 36 Net cash flows from investing activities (212,772 ) (9,734 ) — (222,506 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (65,327 ) — — (65,327 ) Borrowings on revolving credit facilities 1,273,959 — — 1,273,959 Repayments of borrowings on revolving credit facilities' (1,138,959 ) — — (1,138,959 ) Investment from (to) parent 9,772 (14,447 ) 4,675 — Payments for debt issuance costs (1,906 ) — — (1,906 ) Payment of tax withholdings on equity-based payment arrangements (933 ) — — (933 ) Excess tax benefits from equity-based payment arrangements 312 — — 312 Net cash flows from financing activities 76,918 (14,447 ) 4,675 67,146 Increase in cash and cash equivalents 13,976 3,415 — 17,391 Cash and cash equivalents at beginning of period 5,610 — — 5,610 Cash and cash equivalents at end of period $ 19,586 $ 3,415 $ — $ 23,001 Clearwater Paper Corporation Consolidating Statement of Cash Flows Twelve Months Ended December 31, 2015 (In thousands) Issuer Guarantor Subsidiaries Eliminations Total CASH FLOWS FROM OPERATING ACTIVITIES Net earnings $ 56,393 $ 2,476 $ (2,886 ) $ 55,983 Adjustments to reconcile net earnings to net cash flows from operating activities: Depreciation and amortization 65,078 19,654 — 84,732 Equity-based compensation expense 4,557 — — 4,557 Deferred taxes 9,944 3,178 2,959 16,081 Employee benefit plans 3,011 — — 3,011 Deferred issuance costs on debt 928 — — 928 Disposal of plant and equipment, net 1,587 (95 ) — 1,492 Other non-cash activities (1,028 ) 8 — (1,020 ) Changes in working capital, net 11,809 3,032 — 14,841 Change in taxes receivable, net (9,461 ) (14,388 ) 10,253 (13,596 ) Excess tax benefits from equity-based payment arrangements (1,433 ) — — (1,433 ) Funding of qualified pension plans (3,179 ) — — (3,179 ) Other, net (1,591 ) (1,131 ) — (2,722 ) Net cash flows from operating activities 136,615 12,734 10,326 159,675 CASH FLOWS FROM INVESTING ACTIVITIES Change in short-term investments, net 49,750 — — 49,750 Additions to property, plant and equipment (121,720 ) (7,182 ) — (128,902 ) Proceeds from sale of assets — 604 — 604 Net cash flows from investing activities (71,970 ) (6,578 ) — (78,548 ) CASH FLOWS FROM FINANCING ACTIVITIES Purchase of treasury stock (99,990 ) — — (99,990 ) Investment from (to) parent 16,482 (6,156 ) (10,326 ) — Payment of tax withholdings on equity-based payment arrangements (4,152 ) — — (4,152 ) Excess tax benefits from equity-based payment arrangements 1,433 — — 1,433 Other, net (139 ) — — (139 ) Net cash flows from financing activities (86,366 ) (6,156 ) (10,326 ) (102,848 ) Decrease in cash and cash equivalents (21,721 ) — — (21,721 ) Cash and cash equivalents at beginning of period 27,331 — — 27,331 Cash and cash equivalents at end of period $ 5,610 $ — $ — $ 5,610

Nature of Operations and Basi49

Nature of Operations and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended			46 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 15, 2015
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Provision for doubtful accounts	$ 0.2	$ 0.7	$ 0.2
Cash	15.7	23		$ 15.7
Other Nonrecurring Expense, Planned Permaent Facility Closure	14.7	1.7
Business Combination, Consideration Transferred		$ 71.7
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	4.3
Oklahoma City sublease expense	3.2
Other Expense, Planned Permanent Facility Closure	7.2
Long Island, New York Facility [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Other Nonrecurring Expense, Planned Permaent Facility Closure	$ 1.4			$ 24.6
Common Stock
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Stock Repurchase Program, Authorized Amount					$ 100
Kroger Company | Sales Revenue, Net [Member] | Consumer Products
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Concentration Risk, Percentage	15.30%	13.40%	12.30%

Summary of Significant Accout50

Summary of Significant Accouting Policies Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended			24 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	Dec. 31, 2017	Dec. 16, 2016	Dec. 15, 2015	Dec. 27, 2010
Property, Plant and Equipment [Line Items]
Cash	$ 15,700				$ 23,000				$ 15,700	$ 23,000		$ 15,700
Allowance for doubtful accounts	1,400				1,500				1,400	1,500		1,400
Provision for doubtful accounts									200	700	$ 200
Goodwill	244,161				244,283				244,161	244,283		244,161
Net sales	436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	1,730,408	$ 1,734,763	$ 1,752,401
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 29,800								$ 29,800			$ 29,800
Percentage of expected natural gas requirement covered under contract for next fiscal year	17.00%								17.00%			17.00%
Percentage Of Expected Natural Gas Requirement Covered Under Contract For Next Fiscal Quarter	30.00%								30.00%			30.00%
Percentage of natural gas requirement covered under contract									28.00%	45.00%	57.00%
Other Nonrecurring Expense, Planned Permaent Facility Closure									$ 14,700	$ 1,700
Restructuring and Related Cost, Accelerated Depreciation									$ 3,700	1,300
treasury stock retired, shares	7,821,005								7,821,005			7,821,005
Common Stock
Property, Plant and Equipment [Line Items]
Common stock authorized (in shares)														$ 100,000
Number of shares repurchased (in shares)									1,440,696		1,881,921	84,750
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)									$ 57.53		$ 53.13
Consumer Products
Property, Plant and Equipment [Line Items]
Goodwill	$ 209,100								$ 209,100			$ 209,100
Net sales									$ 941,907	$ 988,380	$ 959,894
Kroger Company | Consumer Products | Sales Revenue, Net [Member]
Property, Plant and Equipment [Line Items]
Percentage of total revenue from single customer									15.30%	13.40%	12.30%
Cellu Tissue Holdings Inc
Property, Plant and Equipment [Line Items]
Goodwill															$ 229,500
Manchester Industries [Domain]
Property, Plant and Equipment [Line Items]
Goodwill													$ 35,100
Land Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life									10 years
Land Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life									40 years
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life									10 years
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life									40 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life									5 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life									25 years
Office And Other Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life									2 years
Office And Other Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life									15 years

Recently Adopted and New Acco51

Recently Adopted and New Accounting Standards Recently Adopted and New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Other Nonrecurring Expense, Planned Permaent Facility Closure	$ 14,700	$ 1,700
Proceeds and Excess Tax Benefit from Share-based Compensation	2,200
Operating Leases, Future Minimum Payments Due	$ 75,340
Diluted EPS impact of adoption of ASU 2016-09	$ 0.13

Business Combinations (Details)

Business Combinations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 16, 2016
Business Combination, Separately Recognized Transactions [Line Items]
Manchester Industries Acquisition purchase price true-up to taxes and goodwill	$ 100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets			$ 22,046,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			6,967,000
Goodwill, Acquired During Period		$ 35,074,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			25,472,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			89,559,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			5,403,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			12,491,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			17,894,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			71,665,000
Business Combination, Contingent Consideration, Liability			4,200,000
Business Combination, Consideration Transferred		71,700,000
Cash purchase price			$ 67,500,000
Business Combination, Consideration Transferred, Other		700,000
Business Acquisition, Transaction Costs	$ 200,000	$ 2,700,000

Inventories (Detail)

Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Pulp, paperboard and tissue products	$ 165,281	$ 154,460
Materials and supplies	85,987	82,005
Logs, pulpwood, chips and sawdust	14,775	21,564
Inventories	$ 266,043	$ 258,029

Property, Plant and Equipment54

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Machinery and equipment	$ 2,124,701	$ 2,000,512
Buildings and improvements	340,042	328,251
Land improvements	49,908	47,844
Office and other equipment	46,467	40,051
Land	11,726	7,266
Construction in progress	114,424	103,429
Property, plant and equipment, gross, total	2,687,268	2,527,353
Less accumulated depreciation and amortization	(1,636,286)	(1,582,025)
Property, plant and equipment, net	$ 1,050,982	$ 945,328

Property, Plant and Equipment A

Property, Plant and Equipment Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 97	$ 86.1	$ 79.8
Interest expense, capitalized	4.6	2.3	$ 0.4
Restructuring and Related Cost, Accelerated Depreciation	3.7	1.3
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Capital leased assets, gross	$ 24.4	$ 0

Goodwill and Intangible Asset56

Goodwill and Intangible Assets Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill	$ 244,161	$ 244,283
Non-compete agreements
Useful Life	5 years	5 years
Minimum | Non-compete agreements
Useful Life	5 years
Maximum | Non-compete agreements
Useful Life	10 years
Consumer Products
Goodwill	$ 209,100

Goodwill and Intangible Asset57

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 244,161	$ 244,283
Finite-lived Intangible Assets Acquired	25,500
Historical Cost	70,333	70,333
Accumulated Amortization	(37,791)	(29,848)
Net Balance	$ 32,542	$ 40,485
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	9 years 4 months	9 years 4 months
Historical Cost	$ 62,401	$ 62,401
Accumulated Amortization	(34,061)	(27,364)
Net Balance	$ 28,340	$ 35,037
Trade names and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	7 years 5 months	7 years 5 months
Historical Cost	$ 6,786	$ 6,786
Accumulated Amortization	(3,000)	(1,972)
Net Balance	$ 3,786	$ 4,814
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years	5 years
Historical Cost	$ 574	$ 574
Accumulated Amortization	(574)	(512)
Net Balance	$ 0	$ 62
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Historical Cost	$ 572
Accumulated Amortization	(156)
Net Balance	$ 416
Minimum | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years
Maximum | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Pulp and Paperboard
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 35,100

Goodwill and Intangible Asset58

Goodwill and Intangible Assets Estimated Future Amortization Expense Related to Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 7,801
2,019	7,801
2,020	3,246
2,021	2,917
2,022	2,217
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	8,560
Net Balance	$ 32,542	$ 40,485

Earnings (Loss) Before Income T

Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction [Abstract]
Earnings before income taxes	$ 40,954	$ 80,666	$ 92,488

Provision (Benefit) for Income

Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal	$ (16,729)	$ 7,434	$ 15,579
State	933	5,351	4,855
Foreign	0	0	(10)
Current Income Tax Expense (Benefit)	(15,796)	12,785	20,424
Deferred
Federal	(36,810)	15,573	13,006
State	(3,779)	2,754	3,075
Deferred tax expense	(40,589)	18,327	16,081
Income tax provision	$ (56,385)	$ 31,112	$ 36,505

Income Tax Reconciliation (Deta

Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Computed expected tax provision	$ 14,334	$ 28,233	$ 32,371
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	(70,055)	0	0
State and local taxes, net of federal income tax impact	(1,201)	3,046	3,753
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	3,158	2,850	(3,593)
Effective Income Tax Rate Reconciliation, Adjustment for New York State Attribute True Up, Amount	2,207	0	0
Other	1,488	2,683	(3,212)
Income tax provision	$ (56,385)	$ 31,112	$ 36,505

Tax Effects of Significant Temp

Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 700	$ 600
Deferred tax assets:
Employee benefits	3,940	6,255
Postretirement employee benefits	17,132	27,370
Incentive compensation	5,194	11,356
Inventories	7,959	8,859
Pensions	2,516	8,338
Federal and state credit carryforwards	11,752	8,369
Net operating losses	3,088	1,462
Other	1,949	3,774
Total deferred tax assets	53,530	75,783
Valuation allowance	(3,733)	(4,407)
Deferred tax assets, net of valuation allowance	49,797	71,376
Deferred tax liabilities:
Plant and equipment	(153,885)	(206,502)
Intangible assets	(7,577)	(14,136)
Deferred Tax Liabilities, Gross	161,462	220,638
Total deferred tax liabilities	(111,665)	$ (149,262)
Valuation allowances, State Tax Credits [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 11,100

Net Deferred Tax Assets (Liabil

Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Net Deferred Tax Assets Liabilities [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 700	$ 600
Non-current deferred tax assets	6,863	2,910
Non-current deferred tax liabilities	118,528	152,172
Non-current deferred tax liabilities	(111,665)	(149,262)
Deferred Tax Liabilities, Net	$ (111,665)	$ (149,262)

Tax Credits and Losses Subject

Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions		$ (254)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ (1,101)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		655
Tax Credit Carryforward, Amount	11,752	8,369
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions		(234)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	(1,149)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		619
Interest and Penalties
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions		(20)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	$ (48)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 36

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Tax Credit Carryforward [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 70,055	$ 0	$ 0
Federal statutory tax rate under Tax Cuts and Jobs Act	0.21
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 900
Statutory federal income tax rate	35.00%
Change for uncertain tax positions	$ (1,300)
Deferred tax assets, gross	53,530	75,783
Deferred Tax Assets, Valuation Allowance	3,733	4,407
Proceeds and Excess Tax Benefit from Share-based Compensation	2,200
Change in valuation allowance	700	600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,800
Unrecognized Tax Benefits	2,770	2,434
Unrecognized tax benefits , if recognized, would favorably impact effective tax rate	3,600	4,100	3,200
Accrued interest related to tax obligations	100	100	100
Federal and state credit carryforwards	11,752	8,369
Investment Tax Credit	2,400
Income Tax Examination, Penalties Accrued	0	$ 0	$ 0
Valuation allowances, State Tax Credits [Member]
Tax Credit Carryforward [Line Items]
Change in valuation allowance	$ 11,100

Roll Forward of Unrecognized Ta

Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ (655)
Balance	$ 5,140	4,448
Increase in current year tax positions	320
Balance	4,359	5,140
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		291
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		(619)
Balance	4,903	4,227
Increase in current year tax positions	320
Balance	4,074	4,903
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		291
Interest and Penalties
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		(36)
Balance	237	221
Increase in current year tax positions	0
Balance	$ 285	237
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		$ 0

Accounts Payable and Accrued 67

Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract]
Trade accounts payable	$ 169,293	$ 128,106
Accrued wages, salaries and employee benefits	41,979	49,871
Accrued interest	12,723	12,149
Accrued discounts and allowances	7,283	10,291
Accrued utilities	6,759	6,712
Accrued taxes other than income taxes payable	6,907	6,946
Other	11,677	9,624
Accounts payable and accrued liabilities	$ 256,621	$ 223,699

Debt - Additional Information (

Debt - Additional Information (Details) $ in Thousands	Jul. 29, 2014USD ($)	Jul. 29, 2014USD ($)	Jan. 23, 2013USD ($)	Dec. 31, 2017USD ($)Rate	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 21, 2013USD ($)
Debt Instrument [Line Items]
Proceeds from Lines of Credit				$ 298,308	$ 1,273,959	$ 0
Accrued interest				12,723	12,149
Credit facility, maximum borrowing capacity				300,000
Repayments of Lines of Credit				$ 278,308	1,138,959	$ 0
Outside equity interest percentage maximum | Rate				0.00%
Available incremental borrowings under Credit Agreements				$ 200,000
Available incremental borrowings under Credit Agreements, additional amount				$ 100,000
Lien leverage ratio, maximum				3
Maximum percentage of Farm Credit Agreement outstanding amount to total outstanding amount from both Credit Agreements | Rate				50.00%
Line of Credit Facility, Fair Value of Amount Outstanding				$ 154,882	$ 135,000
Minimum
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				0.0125
Line of Credit Facility, Commitment Fee Percentage | Rate				0.00%
Maximum
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				0.02
Line of Credit Facility, Commitment Fee Percentage | Rate				0.00%
Senior Notes
Debt Instrument [Line Items]
Proceeds from long-term debt			$ 271,000
Interest rate increase [Domain]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				0.0025
Contractual Interest Rate Reduction [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				0.01
Senior Notes Due Twenty Twenty-five [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 300,000	$ 300,000
Debt instrument, maturity date	Feb. 1, 2025
Debt instrument, interest rate	5.375%	5.375%
Proceeds from long-term debt	$ 298,000
Redemption Price	100.00%	100.00%
Senior Notes Due Twenty Twenty-five [Member] | Minimum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term		30 days
Senior Notes Due Twenty Twenty-five [Member] | Maximum
Debt Instrument [Line Items]
Debt Instrument Redemption Notice Term		60 days
Senior Notes Due Twenty Twenty-Three [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount											$ 275,000
Debt instrument, interest rate											4.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding stand by letters of credit				$ 7,600
Credit facility available to draw				137,400
Wells Fargo [Domain]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				200,000
Northwest Farm Credit [Domain]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity				$ 100,000
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Total leverage ratio								4	4.25	4.50
Interest coverage ratio							2.25	1.75

Other Long-Term Obligations (De

Other Long-Term Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Other Long Term Obligations [Abstract]
Long-term lease obligations, net of current portion	$ 26,460	$ 23,152
Deferred compensation	5,023	7,219
Deferred proceeds	5,576	9,013
Other	6,216	2,392
Other long-term obligations	$ 43,275	$ 41,776

Reclassification out of Accum70

Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax		$ (43,983)	$ (51,753)
Net current period other comprehensive income ending balance		7,770	3,795	$ 15,315
Amortization of actuarial loss		(9,200)	(600)
Amortization of actuarial loss included in net periodic cost, before tax		3,300	3,900
Amortization of prior service (cost) credit		1,500	1,700
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax		3,100	1,200
Defined Benefit Plan, Settlements, Benefit Obligation			3,500
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax		0	1,366	0
Defined Benefit Pension Plan Adjustments
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss, net of tax		(43,983)	(51,753)	(55,548)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]	6,745	2,495
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		1,025	1,300
Net current period other comprehensive income ending balance	[2]	7,770	3,795
Pension Plan [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss		9,874	11,463	12,619
Amortization of prior service (cost) credit		(8)	(22)	(73)
Defined Benefit Plan, Settlements, Benefit Obligation		$ 0	$ 3,482	$ 0
[1]	Included in "Other comprehensive income before reclassifications" above for the twelve months ended December 31, 2016 is settlement expense of $3.5 million associated with the remeasurement of our salaried pension plan, which is discussed further in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.” The settlement expense is net of tax totaling $1.4 million.
[2]	1For the year ended December 31, 2017, net periodic costs associated with our pension and other postretirement employee benefit, or OPEB, plans included in other comprehensive loss and reclassified from accumulated other comprehensive loss, or AOCL, included $9.2 million of net gain on plan assets, $3.3 million of actuarial loss amortization, and $1.5 million of prior service credit amortization, less total tax of $3.1 million. For the year ended December 31, 2016, net periodic costs associated with our pension and OPEB plans included in other comprehensive income and reclassified from AOCL included $0.6 million of net gain on plan assets, $3.9 million of actuarial loss amortization, and $1.7 million of prior service credit amortization, less total tax of $1.2 million. These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs in Note 13, “Savings, Pension and Other Postretirement Employee Benefit Plans.”

Changes in Benefit Obligation,

Changes in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Defined Benefit Plan, Settlements, Benefit Obligation		$ 3,500
Pension Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 304,388	318,444
Service cost	2,069	1,562	$ 1,244
Interest cost	13,149	14,072	13,931
Actuarial losses (gains)	19,130	6,225
Benefits paid	(20,922)	(25,286)
Benefit obligation at end of year	317,814	304,388	318,444
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	285,638	294,076
Actual return on plan assets	45,796	27,056
Employer contribution	454	421
Fair value of plan assets at end of year	310,966	285,638	294,076
Defined Benefit Plan, Settlements, Plan Assets	0	(10,629)
Funded status at end of year	(6,848)	(18,750)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	8,144	1,740
Current liabilities	(441)	(397)
Noncurrent liabilities	(14,551)	(20,093)
Net amount recognized	(6,848)	(18,750)
Defined Benefit Plan, Settlements, Benefit Obligation	0	3,482	0
Other Postretirement Employee Benefit Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	69,163	71,672
Service cost	163	249	363
Interest cost	2,745	3,075	3,881
Actuarial losses (gains)	(1,254)	816
Benefits paid	(5,689)	(6,649)
Benefit obligation at end of year	65,128	69,163	71,672
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	20	20
Actual return on plan assets	0	0
Employer contribution	5,689	6,649
Fair value of plan assets at end of year	20	20	20
Defined Benefit Plan, Settlements, Plan Assets	0	0
Funded status at end of year	(65,108)	(69,143)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets	0	0
Current liabilities	(7,190)	(7,424)
Noncurrent liabilities	(57,918)	(61,719)
Net amount recognized	(65,108)	(69,143)
Defined Benefit Plan, Settlements, Benefit Obligation	$ 0	$ 0	$ 0

Amounts Recognized (Pre-tax) in

Amounts Recognized (Pre-tax) in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ (10,300)
Net loss	99,865	$ 117,640
Prior service cost (credit)	0	8
Net amount recognized	99,865	117,648
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	(900)
Net loss	(15,541)	(20,906)
Prior service cost (credit)	(1,676)	(3,211)
Net amount recognized	$ (17,217)	$ (24,117)

Certain Pension Plans with Accu

Certain Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 178,452	$ 170,716
Accumulated benefit obligation	178,452	170,716
Fair value of plan assets	$ 163,460	$ 150,226

Pre-tax Components of Net Perio

Pre-tax Components of Net Periodic Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation		$ 3,500
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,069	1,562	$ 1,244
Interest cost	13,149	14,072	13,931
Expected return on plan assets	(18,765)	(19,389)	(20,117)
Amortization of prior service cost (credit)	8	22	73
Amortization of actuarial loss	9,874	11,463	12,619
Defined Benefit Plan, Settlements, Benefit Obligation	0	3,482	0
Net periodic cost	6,335	11,212	7,750
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	163	249	363
Interest cost	2,745	3,075	3,881
Expected return on plan assets	(1)	(1)	(1)
Amortization of prior service cost (credit)	(1,535)	(1,712)	(2,178)
Amortization of actuarial loss	(6,618)	(7,566)	0
Defined Benefit Plan, Settlements, Benefit Obligation	0	0	0
Net periodic cost	$ (5,246)	$ (5,955)	$ 2,065

Other Amounts Recognized in Oth

Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation		$ (3,500)
Amortization of prior service (cost) credit	$ 1,500	1,700
Amortization of actuarial (loss) gain	9,200	600
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	0	(3,482)	$ 0
Net (gain) loss	(7,901)	(1,445)	15,942
Amortization of prior service (cost) credit	(8)	(22)	(73)
Amortization of actuarial (loss) gain	(9,874)	(11,463)	(12,619)
Total recognized in other comprehensive (income) loss	(17,783)	(16,412)	3,250
Defined Benefit Plan Total Recognized In Net Periodic Benefit Costs And Other Comprehensive Income Before Tax	(11,448)	(5,200)	11,000
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	0	0	0
Net (gain) loss	(1,253)	818	(30,700)
Amortization of prior service (cost) credit	1,535	1,712	2,178
Amortization of actuarial (loss) gain	6,618	7,566	0
Total recognized in other comprehensive (income) loss	6,900	10,096	(28,522)
Defined Benefit Plan Total Recognized In Net Periodic Benefit Costs And Other Comprehensive Income Before Tax	$ 1,654	$ 4,141	$ (26,457)

Weighted Average Assumptions Us

Weighted Average Assumptions Used to Determine Benefit Obligation (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.45%	4.70%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.95%	4.30%	4.50%

Weighted Average Assumptions 77

Weighted Average Assumptions Used to Determine Net Periodic Cost (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 10.3
Discount rate	4.45%	4.70%	4.25%
Expected return on plan assets	6.75%	6.75%	7.00%
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 0.9
Discount rate	4.30%	4.50%	4.15%
Expected return on plan assets	0.00%	0.00%	0.00%

One Percentage Point Change in

One Percentage Point Change in Health Care Cost Trend Rates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of 1% increase on total service and interest cost components	$ 193
Effect of 1% decrease on total service and interest cost components	(168)
Effect of 1% increase on postretirement employee benefit obligation	4,150
Effect of 1% decrease on postretirement employee benefit obligation	$ (3,614)

Investments at Fair Value for C

Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,010,000	$ 2,002,000
defined benefit plan net asset value	0	0
Common and collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	308,956,000	283,636,000
defined benefit plan net asset value	308,956,000	283,636,000
Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	310,966,000	285,638,000
defined benefit plan net asset value	308,956,000	283,636,000
Fair Value, Inputs, Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,010,000	2,002,000
Fair Value, Inputs, Level 1 | Common and collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,010,000	$ 2,002,000

Long Term Asset Allocation Rang

Long Term Asset Allocation Ranges (Details)	12 Months Ended
	Dec. 31, 2017
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term assets, minimum	14.00%
Defined benefit plan, long-term assets, maximum	22.00%
International equities, including emerging markets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term assets, minimum	13.00%
Defined benefit plan, long-term assets, maximum	22.00%
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term assets, minimum	50.00%
Defined benefit plan, long-term assets, maximum	70.00%
Liquid reserves
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, long-term assets, minimum	0.00%
Defined benefit plan, long-term assets, maximum	5.00%

Estimated Future Benefit Paymen

Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2017USD ($)
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2,015	$ 20
2,016	20
2,017	20
2,018	20
2,019	20
2020-2023	100
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2,015	7
2,016	7
2,017	6
2,018	5
2,019	5
2020-2023	$ 19

Savings, Pension and Other Po82

Savings, Pension and Other Postretirement Employee Benefit Plans Multiemployer Defined Benefit Plans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Withdrawal Obligation		$ 78,000
Entity Tax Identification Number		516,031,295
Contributions (in thousands)		$ 6,148	$ 6,014	$ 5,960
IAM
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan Number		2
Multiemployer Plans, Certified Zone Status		Green	Green
Contributions (in thousands)		$ 333	$ 335	329
Multiemployer Plans, Surcharge		No
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		May 31, 2018
USW
Defined Benefit Plan Disclosure [Line Items]
Entity Tax Identification Number		116,166,763
Multiemployer Plan Number		1
Multiemployer Plans, Certified Zone Status	[1]	Red	Red
Contributions (in thousands)		$ 5,815	$ 5,679	$ 5,631
Multiemployer Plans, Surcharge		No
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Aug. 31, 2017
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		7.40%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		6.70%
Maximum [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		4.00%
[1]	PIUMPF has been certified as in "Critical and Declining Status" for 2017 and 2016, under the provisions of the Multiemployer Pension Plan Reform Act of 2014.

Savings, Pension and Other Po83

Savings, Pension and Other Postretirement Employee Benefit Plans Additional Information (Details)	12 Months Ended
	Dec. 31, 2017USD ($)$ / h	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 16,900,000
Multiemployer Plans, Withdrawal Obligation	$ 78,000,000
Salaried Pension Plan Single Lump Sum Payments		10,600,000
Hourly Pension Plan Single Lump Sum Payments		4,800,000
Defined Benefit Plan, Settlements, Benefit Obligation		3,500,000
IAM
Defined Benefit Plan Disclosure [Line Items]
Contribution rates | $ / h	4
USW
Defined Benefit Plan Disclosure [Line Items]
Contribution rates | $ / h	2.79
Maximum | Plan A [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded Percentage Of Pension Protection Plan	65.00%
Maximum | Plan B [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded Percentage Of Pension Protection Plan	80.00%
Minimum | Plan B [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded Percentage Of Pension Protection Plan	65.00%
Minimum | Plan C [Member]
Defined Benefit Plan Disclosure [Line Items]
Funded Percentage Of Pension Protection Plan	80.00%
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss expected to be recognized as component of net periodic benefit over the next fiscal year	$ (10,300,000)
Fair value of plan assets	310,966,000	285,638,000	$ 294,076,000
Employer contribution	454,000	421,000
Defined Benefit Plan, Settlements, Benefit Obligation	0	3,482,000	0
Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net loss expected to be recognized as component of net periodic benefit over the next fiscal year	(900,000)
Prior service cost, expected to be recognized as a component of net periodic benefit cost over the next fiscal year	$ 1,700,000
Assumed health care cost trend rates used to determine the company's benefit obligations and expense	7.40%
Assumed health care cost trend rates, graded rate	6.70%
Expected year when trend rate to be reached	70 years
Fair value of plan assets	$ 20,000	20,000	20,000
Employer contribution	5,689,000	6,649,000
Defined Benefit Plan, Settlements, Benefit Obligation	$ 0	0	0
Other Postretirement Employee Benefit Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rates, graded rate	4.00%
defined benefit plan, ultimate health care cost trend rates, with added benefits	2.50%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 500,000
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	0
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	0
Fair Value, Inputs, Level 1 | Other Postretirement Employee Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,000	20,000
Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	16,600,000		$ 16,900,000
Cost of Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	600,000	3,000,000
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 400,000	$ 2,300,000

Share Reconciliation of Number

Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) - $ / shares		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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic average common shares outstanding	[1]									16,464,286	17,000,599	18,762,451
Incremental shares due to:
Restricted stock units										21,522	21,668	33,128
Performance shares										45,252	76,525	24,717
Incremental Common Shares Attributable to Stock Options										24,866	7,648	0
Diluted average common shares outstanding										16,555,926	17,106,440	18,820,296
Basic net earnings per common share		$ 4.92	$ 0.05	$ 0.49	$ 0.46	$ 0.56	$ 0.05	$ 1.22	$ 1.05	$ 5.91	$ 2.91	$ 2.98
Diluted net earnings per common share		$ 4.88	$ 0.05	$ 0.48	$ 0.45	$ 0.56	$ 0.05	$ 1.21	$ 1.05	$ 5.88	$ 2.90	$ 2.97
Anti-dilutive shares excluded from calculation										499,348	220,037	331,168
[1]	Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 15, "Equity-Based Compensation Plans" for further discussion.

Equity-Based Compensation Pla85

Equity-Based Compensation Plans Employee Plans Equity Based Compensation Expense (Details) - USD ($) $ 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]
Employee equity-based compensation	$ 6,453	$ 7,605	$ 8,630
Related tax benefit	2,149	2,767	3,193
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	1,618	1,381	2,116
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	2,283	3,311	4,408
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation	$ 2,552	$ 2,913	$ 2,106

Equity-Based Compensation Pla86

Equity-Based Compensation Plans Summary of Status of Outstanding RSU Awards (Details) - Restricted stock units - 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]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 1,100
Number of share
Beginning Balance	54,460	46,029	93,254
Granted	66,774	44,627	23,148
Vested	(17,531)	(29,338)	(65,217)
Forfeited	(9,232)	(6,858)	(5,156)
Ending Balance	94,471	54,460	46,029
Weighted Average Grant Date Fair Value
Beginning Balance	$ 47.16	$ 60.17	$ 47.95
Granted	56.45	39.10	62.02
Vested	62.75	55.16	43.86
Forfeited	53.52	47.80	58.58
Ending Balance	$ 50.22	$ 47.16	$ 60.17
Aggregate intrinsic value
Aggregate intrinsic value	$ 4,289	$ 3,570	$ 2,096
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 2,800
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months

Equity-Based Compensation Pla87

Equity-Based Compensation Plans Assumption Used in Monte Carlo Model to Estimate Fair Value of Performance Shares Awards (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value	$ 61.95
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 18.82	$ 14.42	$ 20.82
Risk free rate	2.05%
Measurement period	6 years
Volatility	30.00%
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of stock on date of grant	$ 56.75
Risk free rate	1.42%
Measurement period	3 years
Volatility	35.00%

Equity-Based Compensation Pla88

Equity-Based Compensation Plans Summary of Status of Outstanding Performance Share Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance share payout measured by total shareholder return	40.00%			40.00%
Percentage of performance share payout measured by return on invested capital	60.00%			60.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				7 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	131,947	137,860		131,947
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance		527,054		527,054	277,693	150,580
Granted				158,484	280,191	142,542
Forfeited				(22,306)	(30,830)	(15,429)
Ending Balance	657,319		527,054	657,319	527,054	277,693
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted				$ 56.45	$ 38.86	$ 61.93
Aggregate intrinsic value
Aggregate intrinsic value	$ 0		$ 7	$ 0	$ 7	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			89.00%
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested Shares Settled	41,538			0
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Settled and Distributed In Period			45,953
Number of share
Ending Balance	117,252		175,683	117,252	175,683	92,563
Granted				33,907	93,397	47,513
Settled				(87,491)	0	(245,525)
Forfeited				(4,847)	(10,277)	(10,289)
Beginning Balance		175,683		175,683	92,563	300,864
Weighted Average Grant Date Fair Value
Beginning Balance		$ 62.26		$ 62.26	$ 84.18	$ 59.77
Granted				58.58	39.70	62.05
Settled				84.65	0	50.43
Forfeited				47.61	54.55	73.61
Ending Balance	$ 45.10		$ 62.26	$ 45.10	$ 62.26	$ 84.18
Aggregate intrinsic value
Aggregate intrinsic value	$ 5,323		$ 11,516	$ 5,323	$ 11,516	$ 4,214
Shares Issued Net Of Shares For Tax Withholdings		27,878
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 2,300			$ 2,300
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Maximum [Member] | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Outstanding Award As Percentage Of Shares Issued			200.00%		200.00%
Minimum [Member] | Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Outstanding Award As Percentage Of Shares Issued			0.00%		0.00%

Equity-Based Compensation Pla89

Equity-Based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended			37 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 31, 2012	Mar. 31, 2018	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	657,319		527,054	657,319	527,054	277,693			150,580
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 52.84		$ 51.83	$ 52.84	$ 51.83	$ 64.47			$ 66.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 66.85	$ 66.85		$ 66.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 0		$ 7	$ 0	$ 7	$ 0			$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				158,484	280,191	142,542
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 56.45	$ 38.86	$ 61.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares				(22,306)	(30,830)	(15,429)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price				$ 50.74	$ 47.79	$ 64.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period				(5,913)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price				$ 66.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term				6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				7 years
Stock Plan, effective date				Dec. 16, 2008
Share Based Compensation Arrangement By Share Based Payment Award Effective Grant Date 2008 Plan Amended and Restated				Feb. 28, 2017
Stock Plan, shares authorized	6,200,000			6,200,000
Shares Available For Grant	3,600,000			3,600,000
Distributed of Previously Deferred Shares	1,775
Cash paid for minimum tax withholdings				$ 1,127	$ 933	$ 4,152
Share based compensation expense				$ (6,453)	(7,605)	(8,630)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	131,947	137,860		131,947
Options, Vested and Expected to be Exercised, Outstanding, Weighted Average Exercise Price	$ 61.95			$ 61.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				7 years 5 months
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 3,100			$ 3,100
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 5 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Unrecognized compensation costs	$ 2,300			$ 2,300
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 2 months
Vested Shares Settled Without Payment	41,538			0
Settlement and distribution of shares issued (in shares)			45,953
Shares issued (in shares)		27,878
Share based compensation expense				$ (2,283)	$ (3,311)	$ (4,408)
Performance Shares [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of amount subject to performance share award of number of shares actually issued			0.00%		0.00%
Performance Shares [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of amount subject to performance share award of number of shares actually issued			200.00%		200.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 18.82	$ 14.42	$ 20.82
Share based compensation expense				$ (2,552)	$ (2,913)	$ (2,106)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				$ 7,700
Employee Stock Option [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year
Employee Stock Option [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 1,100
Unrecognized compensation costs	$ 2,800			$ 2,800
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 9 months
Settlement and distribution of shares issued (in shares)	20,940		19,196	25,940	45,143
Shares issued (in shares)				17,834	30,093
Cash paid for minimum tax withholdings				$ 1,100	$ 900
Balance of Shares Vested and Deferred			33,663		33,663
Share based compensation expense				$ (1,618)	$ (1,381)	(2,116)
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Cellu Tissue Holdings Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Plan, shares authorized	700,000			700,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year			3 years
Share based compensation expense				$ 2,800	(4,800)	$ (4,100)
Deferred compensation share-based arrangements, liability, classified, noncurrent	$ (3,600)		$ (7,900)	(3,600)	(7,900)
Deferred Compensation Share-based Arrangements, Liability, Current	$ (2,400)		$ (3,200)	$ (2,400)	$ (3,200)
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number								124,617

Fair Value Measurements Estimat

Fair Value Measurements Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, restricted cash, and short-term investments (Level 1)	$ 15,738	$ 23,001
Line of Credit Facility, Fair Value of Amount Outstanding	154,882	135,000
Long-term debt (Level 1)	569,250	567,875
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, restricted cash, and short-term investments (Level 1)	15,738	23,001
Line of Credit Facility, Fair Value of Amount Outstanding	155,000	135,000
Long-term debt (Level 1)	$ 575,000	$ 575,000

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases Disclosure [Line Items]
Rent expense	$ 12.6	$ 14.3	$ 14.8

Commitments and Contingencies92

Commitments and Contingencies Commitments and Contingencies Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2017USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,015	$ 2,649
2,016	2,697
2,017	2,662
2,018	2,710
2,019	2,643
Thereafter	24,179
Total future minimum lease payments	37,540
Less interest portion	(15,442)
Present value of future minimum lease payments	22,098
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,015	12,074
2,016	9,692
2,017	8,808
2,018	7,764
2,019	7,416
Thereafter	29,586
Total future minimum lease payments	$ 75,340

Segment Information Reportable

Segment Information Reportable Segments Information (Details) - 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]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down										$ 4,300
Oklahoma City sublease expense										3,200
Gain (Loss) on Disposition of Assets											$ 1,800	$ 1,300
Net sales		$ 436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	1,730,408	1,734,763	1,752,401
Business Acquisition, Transaction Costs		200				2,700				200	2,700
Defined Benefit Plan, Settlements, Benefit Obligation											3,500
Income from operations		26,654	$ 5,451	$ 19,665	$ 20,558	24,110	$ 9,280	$ 40,165	$ 37,762	72,328	111,317	123,670
Depreciation and amortization										104,990	91,090	84,732
Assets		1,802,252				1,684,342				1,802,252	1,684,342	1,527,369
Capital expenditures										198,685	155,677	134,104
Restructuring and Related Cost, Accelerated Depreciation										3,700	1,300
Consumer Products
Segment Reporting Information [Line Items]
Net sales										941,907	988,380	959,894
Income from operations										28,616	67,916
Depreciation and amortization	[1]									65,007	59,375	54,595
Assets		1,069,876				1,031,563				1,069,876	1,031,563	1,046,170
Capital expenditures										112,597	47,079	55,594
Pulp and Paperboard
Segment Reporting Information [Line Items]
Net sales										788,501	746,383	792,507
Income from operations										98,508	112,732	120,861
Depreciation and amortization										34,474	26,741	27,204
Assets		645,353				586,687				645,353	586,687	423,694
Capital expenditures										74,616	104,113	67,929
Operating Segments
Segment Reporting Information [Line Items]
Income from operations										127,124	180,648	176,565
Assets		1,715,229				1,618,250				1,715,229	1,618,250	1,469,864
Capital expenditures										187,213	151,192	123,523
Corporate
Segment Reporting Information [Line Items]
Income from operations	[2]									(54,796)	(69,331)	(52,895)
Depreciation and amortization										5,509	4,974	2,933
Assets		$ 87,023				$ 66,092				87,023	66,092	57,505
Capital expenditures										$ 11,472	$ 4,485	$ 10,581
[1]	3 Depreciation and amortization expense for the Consumer Products segment for the twelve months ended December 31, 2017 and 2016 includes accelerated depreciation of $3.7 million and $1.3 million, respectively, associated with the Oklahoma City facility closure.
[2]	orporate expenses for 2016 include $2.7 million of expenses associated with the acquisition of Manchester Industries. Operating results subsequent to the acquisition of Manchester are included in the Pulp and Paperboard segment. Corporate expenses for 2016 also include a $3.5 million settlement accounting charge associated with a pension lump sum buyout for term-vested participants.

Segment Information Segment Inf

Segment Information Segment Information Summary of Geographic Information Regarding Net Sales (Details) - 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	$ 436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	$ 1,730,408	$ 1,734,763	$ 1,752,401
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,650,066	1,663,231	1,653,208
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									48,604	44,970	59,463
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									12,106	6,831	6,896
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									7,124	5,260	10,016
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									4,255	4,790	5,578
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 8,253	$ 9,681	$ 17,240

Financial Results by Quarter 95

Financial Results by Quarter Financial Results by Quarter (Details) - 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	$ 1,730,408	$ 1,734,763	$ 1,752,401
Costs and expenses:
Cost of sales	(375,277)	(386,581)	(380,733)	(387,030)	(368,524)	(396,605)	(361,851)	(368,647)	(1,529,621)	(1,495,627)	(1,512,849)
Selling, general and administrative expenses	(34,785)	(34,472)	(29,265)	(29,937)	(32,934)	(29,435)	(34,655)	(30,795)	(128,459)	(127,819)	(115,882)
Total operating costs and expenses	(410,062)	(421,053)	(409,998)	(416,967)	(401,458)	(426,040)	(396,506)	(399,442)	(1,658,080)	(1,623,446)	(1,628,731)
Income from operations	26,654	5,451	19,665	20,558	24,110	9,280	40,165	37,762	72,328	111,317	123,670
Net earnings	$ 80,924	$ 863	$ 8,037	$ 7,515	$ 9,343	$ 901	$ 20,864	$ 18,446	$ 97,339	$ 49,554	$ 55,983
Net earnings per common share:
Basic (in dollars per share)	$ 4.92	$ 0.05	$ 0.49	$ 0.46	$ 0.56	$ 0.05	$ 1.22	$ 1.05	$ 5.91	$ 2.91	$ 2.98
Diluted (in dollars per share)	$ 4.88	$ 0.05	$ 0.48	$ 0.45	$ 0.56	$ 0.05	$ 1.21	$ 1.05	$ 5.88	$ 2.90	$ 2.97

Supplemental Guarantor Financ96

Supplemental Guarantor Financial Information Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - 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 Financial Statements, Captions [Line Items]
Net sales	$ 436,716	$ 426,504	$ 429,663	$ 437,525	$ 425,568	$ 435,320	$ 436,671	$ 437,204	$ 1,730,408	$ 1,734,763	$ 1,752,401
Cost and expenses:
Cost of sales	(375,277)	(386,581)	(380,733)	(387,030)	(368,524)	(396,605)	(361,851)	(368,647)	(1,529,621)	(1,495,627)	(1,512,849)
Selling, general and administrative expenses	(34,785)	(34,472)	(29,265)	(29,937)	(32,934)	(29,435)	(34,655)	(30,795)	(128,459)	(127,819)	(115,882)
Total operating costs and expenses	(410,062)	(421,053)	(409,998)	(416,967)	(401,458)	(426,040)	(396,506)	(399,442)	(1,658,080)	(1,623,446)	(1,628,731)
Income from operations	26,654	5,451	19,665	20,558	24,110	9,280	40,165	37,762	72,328	111,317	123,670
Interest expense, net									(31,374)	(30,651)	(31,182)
Equity in income (loss) of subsidiary									0	0	0
Earnings before income taxes									40,954	80,666	92,488
Income tax (provision) benefit									56,385	(31,112)	(36,505)
Net earnings	$ 80,924	$ 863	$ 8,037	$ 7,515	$ 9,343	$ 901	$ 20,864	$ 18,446	97,339	49,554	55,983
Other comprehensive income, net of tax									7,770	3,795	15,315
Comprehensive income									105,109	53,349	71,298
Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales									1,707,283	1,685,327	1,683,890
Cost and expenses:
Cost of sales									(1,524,925)	(1,468,691)	(1,458,121)
Selling, general and administrative expenses									(97,989)	(113,766)	(108,414)
Total operating costs and expenses									(1,622,914)	(1,582,457)	(1,566,535)
Income from operations									84,369	102,870	117,355
Interest expense, net									(30,820)	(30,462)	(31,067)
Equity in income (loss) of subsidiary									11,911	5,331	2,476
Earnings before income taxes									53,549	72,408	86,288
Income tax (provision) benefit									34,250	(26,966)	(32,371)
Net earnings									99,710	50,773	56,393
Other comprehensive income, net of tax									7,770	3,795	15,315
Comprehensive income									107,480	54,568	71,708
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales									242,222	287,952	291,270
Cost and expenses:
Cost of sales									(219,931)	(263,577)	(277,487)
Selling, general and administrative expenses									(30,470)	(14,053)	(7,468)
Total operating costs and expenses									(250,401)	(277,630)	(284,955)
Income from operations									(8,179)	10,322	6,315
Interest expense, net									(554)	(189)	(115)
Equity in income (loss) of subsidiary									0	0	0
Earnings before income taxes									(8,733)	10,133	6,200
Income tax (provision) benefit									20,644	(4,802)	(3,724)
Net earnings									11,911	5,331	2,476
Other comprehensive income, net of tax									0	0	0
Comprehensive income									11,911	5,331	2,476
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales									(219,097)	(238,516)	(222,759)
Cost and expenses:
Cost of sales									215,235	236,641	222,759
Selling, general and administrative expenses									0	0	0
Total operating costs and expenses									215,235	236,641	222,759
Income from operations									(3,862)	(1,875)	0
Interest expense, net									0	0	0
Equity in income (loss) of subsidiary									(11,911)	(5,331)	(2,476)
Earnings before income taxes									(3,862)	(1,875)	0
Income tax (provision) benefit									1,491	656	(410)
Net earnings									(14,282)	(6,550)	(2,886)
Other comprehensive income, net of tax									0	0	0
Comprehensive income									$ (14,282)	$ (6,550)	$ (2,886)

Supplemental Guarantor Financ97

Supplemental Guarantor Financial Information Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 15,738	$ 23,001	$ 5,610	$ 27,331
Receivables, net	142,065	147,074
Taxes receivable	20,282	9,709
Inventories	266,043	258,029
Other Assets, Current	8,661	8,682
Total current assets	452,789	446,495
Property, plant and equipment, net	1,050,982	945,328
Goodwill	244,161	244,283
Intangible assets, net	32,542	40,485
Investment in subsidiary	0	0
Other assets, net	21,778	7,751
TOTAL ASSETS	1,802,252	1,684,342	1,527,369
Current liabilities:
Accounts payable and accrued liabilities	256,621	223,699
Line of Credit, Current	155,000	135,000
Current liability for pensions and other postretirement employee benefits	7,631	7,821
Total current liabilities	419,252	366,520
Long-term debt	570,524	569,755
Liability for pensions and other postretirement employee benefits	72,469	81,812
Other long-term obligations	43,275	41,776
Accrued taxes	2,770	2,434
Deferred Tax Liabilities, Net, Noncurrent	111,665	149,262
Deferred Tax Liabilities, Gross, Noncurrent	118,528	152,172
Liabilities	1,226,818	1,214,469
Accumulated other comprehensive loss, net of tax	(43,983)	(51,753)
Stockholders Equity Excluding Accumulated Other Comprehensive Income Loss	619,417	521,626
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,802,252	1,684,342
Issuer
Current assets:
Cash and cash equivalents	15,738	19,586	5,610	27,331
Receivables, net	125,001	130,098
Taxes receivable	20,242	15,143
Inventories	228,311	208,472
Other Assets, Current	8,587	8,161
Total current assets	397,879	381,460
Property, plant and equipment, net	936,659	802,064
Goodwill	244,161	244,283
Intangible assets, net	2,089	3,135
Intercompany receivable (payable)	(2,807)	30,034
Investment in subsidiary	157,000	145,089
Other assets, net	21,413	8,433
TOTAL ASSETS	1,756,394	1,614,498
Current liabilities:
Accounts payable and accrued liabilities	235,439	202,187
Line of Credit, Current	155,000	135,000
Current liability for pensions and other postretirement employee benefits	7,631	7,821
Total current liabilities	398,070	345,008
Long-term debt	570,524	569,755
Liability for pensions and other postretirement employee benefits	72,469	81,812
Other long-term obligations	43,275	41,424
Accrued taxes	1,928	1,614
Deferred Tax Liabilities, Gross, Noncurrent	94,694	105,012
Liabilities	1,180,960	1,144,625
Accumulated other comprehensive loss, net of tax	(43,983)	(51,753)
Stockholders Equity Excluding Accumulated Other Comprehensive Income Loss	619,417	521,626
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,756,394	1,614,498
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	0	3,415	0	0
Receivables, net	17,064	27,252
Taxes receivable	40	35
Inventories	41,594	51,432
Other Assets, Current	74	521
Total current assets	58,772	82,655
Property, plant and equipment, net	114,323	143,264
Goodwill	0	0
Intangible assets, net	30,453	37,350
Intercompany receivable (payable)	(1,055)	(31,909)
Investment in subsidiary	0	0
Other assets, net	2,696	2,853
TOTAL ASSETS	205,189	234,213
Current liabilities:
Accounts payable and accrued liabilities	21,182	37,257
Line of Credit, Current	0	0
Current liability for pensions and other postretirement employee benefits	0	0
Total current liabilities	21,182	37,257
Long-term debt	0	0
Liability for pensions and other postretirement employee benefits	0	0
Other long-term obligations	0	352
Accrued taxes	842	820
Deferred Tax Liabilities, Gross, Noncurrent	26,165	50,695
Liabilities	48,189	89,124
Accumulated other comprehensive loss, net of tax	0	0
Stockholders Equity Excluding Accumulated Other Comprehensive Income Loss	157,000	145,089
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	205,189	234,213
Eliminations
Current assets:
Cash and cash equivalents	0	0	$ 0	$ 0
Receivables, net	0	(10,276)
Taxes receivable	0	(5,469)
Inventories	(3,862)	(1,875)
Other Assets, Current	0	0
Total current assets	(3,862)	(17,620)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Intercompany receivable (payable)	3,862	1,875
Investment in subsidiary	(157,000)	(145,089)
Other assets, net	(2,331)	(3,535)
TOTAL ASSETS	(159,331)	(164,369)
Current liabilities:
Accounts payable and accrued liabilities	0	(15,745)
Line of Credit, Current	0	0
Current liability for pensions and other postretirement employee benefits	0	0
Total current liabilities	0	(15,745)
Long-term debt	0	0
Liability for pensions and other postretirement employee benefits	0	0
Other long-term obligations	0	0
Accrued taxes	0	0
Deferred Tax Liabilities, Gross, Noncurrent	(2,331)	(3,535)
Liabilities	(2,331)	(19,280)
Accumulated other comprehensive loss, net of tax	0	0
Stockholders Equity Excluding Accumulated Other Comprehensive Income Loss	(157,000)	(145,089)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ (159,331)	$ (164,369)

Supplemental Guarantor Financ98

Supplemental Guarantor Financial Information Condensed Consolidating Statement of Cash Flows (Details) - 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
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)	$ 80,924	$ 863	$ 8,037	$ 7,515	$ 9,343	$ 901	$ 20,864	$ 18,446	$ 97,339	$ 49,554	$ 55,983
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization									104,990	91,090	84,732
Equity-based compensation expense									3,620	12,385	4,557
Deferred tax expense (benefit)									(40,589)	18,327	16,081
Employee benefit plans									(4,371)	(1,979)	3,011
Deferred issuance costs on debt									1,199	1,242	928
Disposal of plant and equipment, net									(4,053)	(1,381)	(1,492)
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities									1,750	758	(1,020)
Changes in working capital, net of acquisition									21,761	(3,462)	14,841
Change in taxes receivable, net									(10,573)	5,142	(13,596)
Excess tax benefits from equity-based payment arrangements									0	(312)	(1,433)
Funding of qualified pension plans									0	0	(3,179)
Other, net									(1,509)	(1,375)	(2,722)
Net cash flows from operating activities									177,670	172,751	159,675
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net									0	250	49,750
Additions to property, plant and equipment									(199,748)	(155,349)	(128,902)
Payments to Acquire Businesses, Net of Cash Acquired									0	67,443	0
Proceeds from Sale of Productive Assets									951	36	604
Net cash flows from investing activities									(198,797)	(222,506)	(78,548)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock									(4,875)	(65,327)	(99,990)
Proceeds from Lines of Credit									298,308	1,273,959	0
Repayments of Lines of Credit									(278,308)	(1,138,959)	0
Investment (to) from Parent									0	0	0
Payments for debt issuance costs									0	(1,906)	0
Excess tax benefits from equity-based payment arrangements									0	312	1,433
Payment of tax withholdings on equity-based payment arrangements									(1,127)	(933)	(4,152)
Other, net									(134)	0	(139)
(Decrease) increase in cash and cash equivalents									(7,263)	17,391	(21,721)
Cash and cash equivalents at beginning of period				23,001				5,610	23,001	5,610	27,331
Cash and cash equivalents at end of period	15,738				23,001				15,738	23,001	5,610
Net cash flows from financing activities									13,864	67,146	(102,848)
Issuer
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)									99,710	50,773	56,393
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization									76,862	68,496	65,078
Equity-based compensation expense									3,620	12,385	4,557
Deferred tax expense (benefit)									(16,957)	18,860	9,944
Employee benefit plans									(4,371)	(1,979)	3,011
Deferred issuance costs on debt									1,199	1,242	928
Disposal of plant and equipment, net									(512)	(781)	1,587
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities									1,750	740	(1,028)
Changes in working capital, net of acquisition									8,776	642	(11,809)
Change in taxes receivable, net									(5,099)	(1,078)	9,461
Excess tax benefits from equity-based payment arrangements										(312)	(1,433)
Funding of qualified pension plans											3,179
Other, net									1,585	(1,592)	(1,591)
Net cash flows from operating activities									167,587	149,830	136,615
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net										250	49,750
Additions to property, plant and equipment									(193,864)	(145,579)	(121,720)
Payments to Acquire Businesses, Net of Cash Acquired										67,443
Proceeds from Sale of Productive Assets									283	0	0
Net cash flows from investing activities									(193,581)	(212,772)	(71,970)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock									(4,875)	(65,327)	(99,990)
Proceeds from Lines of Credit									298,308	1,273,959
Repayments of Lines of Credit									(278,308)	(1,138,959)
Investment (to) from Parent									8,282	9,772	16,482
Payments for debt issuance costs										(1,906)
Excess tax benefits from equity-based payment arrangements										312	1,433
Payment of tax withholdings on equity-based payment arrangements									(1,127)	(933)	(4,152)
Other, net									(134)		(139)
(Decrease) increase in cash and cash equivalents									(3,848)	13,976	(21,721)
Cash and cash equivalents at beginning of period				19,586				5,610	19,586	5,610	27,331
Cash and cash equivalents at end of period	15,738				19,586				15,738	19,586	5,610
Net cash flows from financing activities									22,146	76,918	(86,366)
Guarantor Subsidiaries
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)									11,911	5,331	2,476
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization									28,128	22,594	19,654
Equity-based compensation expense									0	0	0
Deferred tax expense (benefit)									(23,632)	605	3,178
Employee benefit plans									0	0	0
Deferred issuance costs on debt									0	0	0
Disposal of plant and equipment, net									(3,541)	(600)	95
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities									0	(18)	(8)
Changes in working capital, net of acquisition									5,529	774	3,032
Change in taxes receivable, net									(5)	(1,405)	(14,388)
Excess tax benefits from equity-based payment arrangements										0	0
Funding of qualified pension plans											0
Other, net									(3,094)	(921)	(1,131)
Net cash flows from operating activities									22,378	27,596	12,734
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net										0	0
Additions to property, plant and equipment									(5,884)	(9,770)	(7,182)
Payments to Acquire Businesses, Net of Cash Acquired										0
Proceeds from Sale of Productive Assets									668	36	604
Net cash flows from investing activities									(5,216)	(9,734)	(6,578)
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock									0	0	0
Proceeds from Lines of Credit									0	0
Repayments of Lines of Credit									0	0
Investment (to) from Parent									(20,577)	(14,447)	(6,156)
Payments for debt issuance costs										0
Excess tax benefits from equity-based payment arrangements										0	0
Payment of tax withholdings on equity-based payment arrangements									0	0	0
Other, net									0		0
(Decrease) increase in cash and cash equivalents									(3,415)	3,415	0
Cash and cash equivalents at beginning of period				3,415				0	3,415	0	0
Cash and cash equivalents at end of period	0				3,415				0	3,415	0
Net cash flows from financing activities									(20,577)	(14,447)	(6,156)
Consolidation, Eliminations [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings (loss)									(14,282)	(6,550)	(2,886)
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization									0	0	0
Equity-based compensation expense									0	0	0
Deferred tax expense (benefit)									0	(1,138)	2,959
Employee benefit plans									0	0	0
Deferred issuance costs on debt									0	0	0
Disposal of plant and equipment, net									0	0	0
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities									0	0	0
Changes in working capital, net of acquisition									7,456	(3,594)	0
Change in taxes receivable, net									(5,469)	5,469	(10,253)
Excess tax benefits from equity-based payment arrangements										0	0
Funding of qualified pension plans											0
Other, net									0	1,138	0
Net cash flows from operating activities									(12,295)	(4,675)	10,326
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments, net										0	0
Additions to property, plant and equipment									0	0	0
Payments to Acquire Businesses, Net of Cash Acquired										0
Proceeds from Sale of Productive Assets									0	0	0
Net cash flows from investing activities									0	0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Purchase of treasury stock									0	0	0
Proceeds from Lines of Credit									0	0
Repayments of Lines of Credit									0	0
Investment (to) from Parent									12,295	4,675	(10,326)
Payments for debt issuance costs										0
Excess tax benefits from equity-based payment arrangements										0	0
Payment of tax withholdings on equity-based payment arrangements									0	0	0
Other, net									0		0
(Decrease) increase in cash and cash equivalents									0	0	0
Cash and cash equivalents at beginning of period				$ 0				$ 0	0	0	0
Cash and cash equivalents at end of period	$ 0				$ 0				0	0	0
Net cash flows from financing activities									$ 12,295	$ 4,675	$ (10,326)

Business Interruption and Ins99

Business Interruption and Insurance Recovery (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Interruption and Insurance Recovery [Abstract]
Operating Insurance and Claims Costs, Production	$ 2.9	$ 2.9	$ 8.5
Deductible and claims costs			3.5
Property insurance claim payment			5
Insurance claim receivable	$ 1.4		$ 1.5