Kapstone Paper & Packaging (KS) Inactive 10-Q29 Oct 142014 Q3 Quarterly reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
Document and Entity Information	Sep. 30, 2014	Oct. 23, 2014
Document and Entity Information	'	'
Entity Registrant Name	'KAPSTONE PAPER & PACKAGING CORP	'
Entity Central Index Key	'0001325281	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	96,000,356
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:	'	'
Cash and cash equivalents	$105,649	$12,967
Trade accounts receivable, less allowance of $364 in 2014 and $682 in 2013	256,658	232,347
Other receivables	10,400	11,399
Inventories	232,578	217,382
Prepaid expenses and other current assets	8,865	6,405
Total current assets	614,150	480,500
Plant, property and equipment, net	1,399,309	1,389,609
Other assets	135,443	129,493
Intangible assets, net	113,494	123,745
Goodwill	533,851	528,515
Total assets	2,796,247	2,651,862
Current liabilities:	'	'
Current portion of long-term debt	'	4,950
Other current borrowings	1,162	'
Accounts payable	154,703	159,127
Accrued expenses	52,897	45,885
Accrued compensation costs	58,928	54,871
Accrued income taxes	930	'
Deferred income taxes	115	5,445
Total current liabilities	268,735	270,278
Other liabilities:	'	'
Long-term debt, net of current portion	1,200,278	1,192,413
Pension and postretirement benefits	64,759	69,611
Deferred income taxes	441,317	444,672
Other liabilities	9,105	8,808
Total other liabilities	1,715,459	1,715,504
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Preferred stock $0.0001 par value; 1,000,000 shares authorized; no shares issued and outstanding	'	'
Common stock - $0.0001 par value; 175,000,000 shares authorized; 95,993,771 shares issued and outstanding (excluding 40,000 treasury shares) at September 30. 2014, and 95,706,212 shares issued and outstanding (excluding 40,000 treasury shares) at December 31, 2013	10	10
Additional paid-in-capital	254,259	246,186
Retained earnings	550,161	412,349
Accumulated other comprehensive income / (loss)	7,623	7,535
Total stockholders' equity	812,053	666,080
Total liabilities and stockholders' equity	$2,796,247	$2,651,862

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Consolidated Balance Sheets	'	'
Trade accounts receivable, allowances (in dollars)	$364	$682
Preferred stock, par value (in dollars per share)	$0.00	$0.00
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	95,993,771	95,706,212
Common stock, shares outstanding	95,993,771	95,706,212
Treasury shares, shares outstanding	40,000	40,000

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Consolidated Statements of Comprehensive Income	'	'	'	'
Net sales	$598,106	$538,603	$1,737,507	$1,184,737
Cost of sales, excluding depreciation and amortization	388,641	352,346	1,164,134	803,045
Depreciation and amortization	34,997	28,522	101,580	62,999
Freight and distribution expenses	46,173	39,679	131,829	95,448
Selling, general, and administrative expenses	34,133	37,538	102,371	77,738
Other operating income	'	177	'	575
Operating income	94,162	80,695	237,593	146,082
Foreign exchange gain/(loss)	-960	359	-859	137
Loss on debt extinguishment	2,963	'	2,963	'
Interest expense, net	8,099	9,585	25,299	14,822
Income before provision (benefit) for income taxes	82,140	71,469	208,472	131,397
Provision for income taxes	27,886	27,055	70,660	47,533
Net income	54,254	44,414	137,812	83,864
Pension and postretirement plan reclassification adjustments:	'	'	'	'
Amortization (accretion) of prior service costs	31	-11	93	-33
Amortization of net gain	-2	48	-5	145
Other comprehensive income, net of tax	29	37	88	112
Total comprehensive income	$54,283	$44,451	$137,900	$83,976
Weighted average number of shares outstanding:	'	'	'	'
Basic (in shares)	95,958,877	95,457,816	95,857,079	95,200,896
Diluted (in shares)	97,515,901	96,997,140	97,416,869	96,655,076
Net income per share:	'	'	'	'
Basic (in dollars per share)	$0.57	$0.47	$1.44	$0.88
Diluted (in dollars per share)	$0.56	$0.46	$1.41	$0.87

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating activities	'	'
Net income	$137,812	$83,864
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	101,580	62,999
Stock-based compensation expense	5,630	4,271
Pension and postretirement	-9,939	1,216
Excess tax benefit from stock-based compensation	-2,960	-2,547
Amortization of debt issuance costs	4,415	3,004
Loss on debt extinguishment	2,963	'
Loss on disposal of fixed assets	1,203	390
Deferred income taxes	-1,059	34,513
Changes in assets and liabilities:	'	'
Trade accounts receivable, net	-24,269	-21,081
Other receivables	999	200
Inventories	-17,222	-3,769
Prepaid expenses and other current assets	-2,462	4,123
Other assets	-716	-1,841
Accounts payable	-3,510	-16,336
Accrued expenses and other liabilities	9,227	6,523
Accrued compensation costs	4,057	9,173
Accrued income taxes	300	4,181
Net cash provided by operating activities	206,049	168,883
Investing activities	'	'
Longview acquisition, net of cash acquired	'	-537,465
Capital expenditures	-112,367	-56,271
Net cash used in investing activities	-112,367	-593,736
Financing activities	'	'
Proceeds from revolving credit facility	97,900	289,113
Repayments on revolving credit facility	-97,900	-316,113
Proceeds from receivables credit facility	175,000	'
Proceeds from long-term debt	'	1,275,000
Repayments of long-term debt	-178,525	-305,313
Redemption of Longview senior notes	'	-507,520
Payment of loan amendment and debt issuance costs	-1,081	-19,654
Proceeds from other current borrowings	6,300	5,115
Repayments on other current borrowings	-5,138	-3,739
Payment of withholding taxes on stock awards	-1,755	-860
Proceeds from exercises of stock options	639	1,627
Proceeds from shares issued to ESPP	600	349
Excess tax benefit from stock-based compensation	2,960	2,547
Net cash provided by (used in) financing activities	-1,000	420,552
Net increase (decrease) in cash and cash equivalents	92,682	-4,301
Cash and cash equivalents-beginning of period	12,967	16,488
Cash and cash equivalents-end of period	$105,649	$12,187

Financial_Statements

Financial Statements	9 Months Ended
Financial Statements	Sep. 30, 2014
Description of Business and Basis of Presentation	'
Financial Statements	'
	1.Financial Statements

	The accompanying unaudited consolidated financial statements of KapStone Paper and Packaging Corporation (the “Company,” “we,” “us,” “our” or “KapStone”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of a normal recurring nature) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. For further information, refer to the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2013.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Sep. 30, 2014
Recent Accounting Pronouncements	'
Recent Accounting Pronouncements	'
	2.Recent Accounting Pronouncements

	In May 2014, the Financial Accounting Standards Board (“FASB’) issued Accounting Standards Update (“ASU”) No. 2014-09 “Revenue from Contracts with Customers”. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The guidance in this update supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) Topic 605, “Revenue Recognition”, and most industry-specific guidance throughout the Industry Topics of the Codification. Additionally, this update supersedes some cost guidance included in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts”. For a public entity, the amendments are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. The ASU allows for full or modified retrospective adoption. Early application is not permitted. The Company is currently evaluating the expected impact of adopting this standard.

	In July 2013, the FASB issued ASU No. 2013-11 “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists”. ASU No. 2013-11 amends the guidance within ASC Topic 740, “Income Taxes”, to require entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The Company adopted ASU No. 2013-11 beginning in the first quarter of 2014 with no impact on the consolidated financial statements.

Longview_Acquisition

Longview Acquisition	9 Months Ended
	Sep. 30, 2014
Longview Acquisition	'
Longview Acquisition	'
	3.Longview Acquisition

	On July 18, 2013, the Company acquired 100 percent of the stock of Longview Fibre Paper and Packaging, Inc., (“Longview”) for $1.025 billion plus $41.5 million of working capital adjustments. Longview is a leading manufacturer of high quality containerboard, kraft papers, and corrugated products. Longview’s operations include a paper mill located in Longview, Washington equipped with five paper machines which have the capacity to produce 1.3 million tons of containerboard and kraft paper annually. Longview also owns seven converting facilities located in the Pacific Northwest.

	The excess of the purchase price over the aggregate estimated fair value of net assets acquired was allocated to goodwill. The purchase price allocation is final.

	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed by major category of assets and liabilities as of December 31, 2013, as well as adjustments (referred to as “measurement period adjustments”):

			Amounts						Amounts
			Recognized as of			Measurement			Recognized as of
			Acquisition Date			Period			Acquisition Date
			(as Adjusted) (1)			Adjustments (2)			(as Adjusted)
	Deposit for redemption of senior notes		$	507,520		$	—		$	507,520
	Trade accounts receivable		104,929			42			104,971
	Inventories		106,805			(2,026		)	104,779
	Prepaid expenses and other current assets		2,554			—			2,554
	Plant, property and equipment		800,663			(7,446		)	793,217
	Pension asset		112,141			—			112,141
	Other receivables and assets		11,863			—			11,863
	Intangible assets		77,600			—			77,600
	Accounts payable		(71,663		)	—			(71,663		)
	Accrued expenses		(17,630		)	80			(17,550		)
	Accrued compensation costs		(19,385		)	61			(19,324		)
	Debt		(507,520		)	—			(507,520		)
	Pension and post retirement benefits		(68,105		)	—			(68,105		)
	Deferred income taxes		(294,086		)	3,953			(290,133		)
	Other noncurrent liabilities		(2,862		)	—			(2,862		)
	Goodwill		302,935			5,336			308,271
	Total acquisition consideration		$	1,045,759		$	—		$	1,045,759

		-1		As previously reported in the Notes to Consolidated Financial Statements included in our 2013 Form 10-K.

		-2		The measurement period adjustments include the following:

		·		Property, plant, and equipment were adjusted downward by $7.4 million to reflect the change in fair value estimates for certain acquired equipment.
		·		Inventories were adjusted by $2.0 million downward to reflect better estimates for replacement parts and supplies.
		·		Deferred income taxes decreased primarily due to the change in property, plant, and equipment and inventories.

Annual_Planned_Maintenance_Out

Annual Planned Maintenance Outages	9 Months Ended
Annual Planned Maintenance Outages	Sep. 30, 2014
Annual Planned Maintenance Outages	'
Annual Planned Maintenance Outage	'
	4.Annual Planned Maintenance Outages

	Annual planned maintenance outage costs for the three months ended September 30, 2014 and 2013 totaled $5.2 million and $1.1 million, respectively, and are included in cost of sales.

	Annual planned maintenance outage costs for the nine months ended September 30, 2014 and 2013 totaled $25.1 million and $14.3 million, respectively. Outage costs for the nine months ended September 30, 2014 included $5.6 million at the North Charleston, South Carolina paper mill for downtime incurred during the upgradge of the No. 3 paper machine and $10.0 million at the Longview, Washington mill for the upgrade of the No. 10 paper machine and other outages. As a result of these outages, production tons were reduced by 19,700 tons and 9,400 tons, respectively, for the nine months ended September 30, 2014 and 2013.

	Outage costs for the nine months ended September 30, 2013 included $5.0 million for the tri-annual planned maintenance outage at the North Charleston, South Carolina mill.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2014
Inventories	'
Inventories	'
	5.Inventories

	Inventories consist of the following at September 30, 2014 and December 31, 2013, respectively:

		(unaudited)
		September 30,		December 31,
		2014		2013
	Raw materials	$	90,329	$	83,136
	Work in process	3,648		3,293
	Finished goods	66,651		58,336
	Replacement parts and supplies	68,829		66,842
	Inventory at FIFO costs	229,457		211,607
	LIFO inventory reserves	3,121		5,775
	Inventories	$	232,578	$	217,382

	The cost for the Longview inventories is determined on a last-in, first-out method except for replacement parts and supplies inventories, which are valued using the average cost method. As of September 30, 2014, Longview’s inventories included in the Consolidated Balance Sheets were $112.6 million.

Shortterm_Borrowings_and_Longt

Short-term Borrowings and Long-term Debt	9 Months Ended
	Sep. 30, 2014
Short-term Borrowings and Long-term Debt	'
Short-term Borrowings and Long-term Debt	'
	6.Short-term Borrowings and Long-term Debt

	Receivables Credit Facility

	In September 2014, certain wholly-owned subsidiaries of the Company (“Originators”) entered into a one-year agreement to sell all domestic receivables (the “Receivables”) on a non-recourse basis (subject to purchase price credits for breaches of certain representations and warranties with respect to the Receivables), to a wholly-owned subsidiary of the Company that is a bankruptcy remote special purpose entity (the “SPE”). Sales of Receivables to the SPE occur daily and are settled on a monthly basis. The SPE finances its purchases of the Receivables in part with proceeds of draws under a one-year facility (“Receivables Credit Facility”), subject to a maximum of $175 million. The actual amount available to draw upon varies based on eligible receivables (as defined in the documents establishing the Receivables Credit Facility). The SPE pays a fee for the drawn and undrawn portions of the Receivables Credit Facility, respectively.

	The SPE’s sole business consists of the purchase of the Receivables from the Originators, through a combination of draws under the Receivables Credit Facility, draws on subordinated notes payable to the Originators and capital contributions from one of the Originators, and the subsequent sale of undivided ownership interests in, or granting of a security interest in, such Receivables to the bank agent under the Receivables Credit Facility. In addition, the SPE is a separate legal entity with its own separate creditors who will be entitled, upon liquidation, to be satisfied out of the SPE’s assets prior to any assets or value in the SPE becoming available to the Originators or the Company, and the assets of the SPE are not available to pay creditors of the Company or any of its affiliates (other than the SPE).

	The Company will service the Receivables in exchange for a servicing fee and guarantees the performance by the Originators of their payment obligations in respect of purchase price credits under the Receivables Credit Facility. At September 30, 2014, $175.0 million was outstanding and included in Long-term debt on the Consolidated Balance Sheets. All of the Receivables at September 30, 2014 have been sold to the SPE and are included in Trade accounts receivable, net of allowance on the Consolidated Balance Sheets.

	This transaction created an on-balance sheet securitization program for KapStone’s trade accounts receivables that is accounted for as a secured borrowing under Accounting Standards Codification (“ASC”) 860, “Transfers and Servicing.”

	The Company included the Receivables Credit Facility in Long-term debt on the Consolidated Balance Sheets based on management’s intent to continue to refinance this agreement until the maturity of the Term loan A-1 which is July 18, 2018. In addition, the Company also has the ability to refinance this short-term obligation on a long-term basis using its Revolving Credit Facility. There are no additional requirements as to when borrowings under the Revolver would need to be repaid. The Revolver’s maturity date is July 18, 2018.

	The Company incurred approximately $0.4 million of fees associated with the Receivable Credit Facility, which have been deferred and will be amortized as interest expense using the effective interest method.

	Proceeds from the Receivables Credit Facility were used to prepay $175.0 million of the term loans and as a result, $3.0 million of unamortized debt issuance costs were written-off as a loss on debt extinguishment.

	Long-term debt consists of the following at September 30, 2014 and December 31, 2013, respectively:

		(unaudited)
		September 30,			December 31,
		2014			2013
	Term loan A-1 under Amended and Restated Credit Agreement with interest payable monthly at LIBOR plus 1.75% at Septemer 30, 2014	$	704,938		$	754,938
	Term loan A-2 under Amended and Restated Credit Agreement with interest payable monthly at LIBOR plus 2.0% at September 30, 2014	340,300			468,825
	Receivables Credit Facility with interest payable monthly at LIBOR plus 0.75% at September 30, 2014	175,000			—
	Total long-term debt	1,220,238			1,223,763
	Less current portion of debt	—			(4,950		)
	Less unamortized debt issuance costs	(19,960		)	(26,400		)
	Long-term debt, net of current portion and debt issuance costs	$	1,200,278		$	1,192,413

	The Company’s weighted average interest rate on all borrowings was 1.83 percent as of September 30, 2014.

	Amendments to the Amended and Restated Credit Agreement

	In April 2014, the Company entered into a First Amendment (the “First Amendment”) to the Amended and Restated Credit Agreement dated as of July 18, 2013 (as amended; the “Credit Agreement”). The First Amendment reduced the borrowing rates under our senior secured credit facility (the “Credit Facility”) for both term loans under the Credit Facility and for any future borrowings under the $400 million revolving credit facility (the “Revolver”) portion of the Credit Facility. The interest rates are based on LIBOR rates plus a margin determined from a pricing grid based on the Company’s debt to EBITDA ratio as defined in our Credit Agreement. Accordingly, the weighted average interest rate on borrowings under the Credit Facility as of September 30, 2014 is 2.0 percent, compared to 2.25 percent as of March 31, 2014. The First Amendment also reduced the unused commitment fees related to the Revolver by 5 to 10 basis points.

	The Company incurred approximately $0.7 million of fees associated with the First Amendment, which have been deferred and are being amortized as interest expense using the effective interest method.

	In August 2014, the Company entered into a Second Amendment to the Amended and Restated Credit Agreement, which included certain technical amendments to the Credit Agreement in connection with the Receivables program and the related Receivables Credit Facility.

	Revolver

	As of September 30, 2014, the Company has current availability of $395.0 million under the Revolver.

	Debt Covenants

	The Credit Agreement contains, among other provisions, covenants with which we must comply. The covenants limit our ability to, among other things, incur indebtedness, create additional liens on our assets, make investments, engage in mergers and acquisitions, pay dividends and sell any assets outside the normal course of business.

	As of September 30, 2014, the Company was in compliance with all applicable covenants in the Credit Agreement.

	Fair Value of Debt

	As of September 30, 2014, the fair value of the Company’s debt approximates the carrying value of $1.2 billion as the variable interest rates re-price frequently at current market rates. The debt was valued using Level 2 inputs in the fair value hierarchy which are significant observable inputs including quoted prices for debt of similar terms and maturities.

	Other Borrowing

	In 2014 and 2013, the Company entered into short-term financing agreements of $6.3 million and $5.1 million, respectively, at an annual interest rate of 1.69 and 1.61 percent, respectively, for its annual property insurance premiums. The agreements require the Company to pay consecutive monthly payments through the term of each financing agreement ending on December 1st. As of September 30, 2014 and September 30, 2013, there was $1.2 million and $1.4 million, respectively, outstanding under these agreements which is included in “Other current borrowings” on the Consolidated Balance Sheets.

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2014
Income Taxes	'
Income Taxes	'
	7.Income Taxes

	The Company’s effective income tax rate for both the three and nine months ended September 30, 2014 was 33.9 percent, compared to 37.9 percent and 36.2 percent for the three and nine months ended September 30, 2013, respectively. Our tax rate is affected by recurring items such as state income taxes and discrete items that may occur in any given period, but are not consistent from period to period. In addition to state income taxes, the domestic manufacturing deduction had the most significant impact on the difference between our statutory U.S. federal income tax rate of 35 percent and our effective income tax rate for both years. The effective income tax rate in the third quarter of 2014 includes a $0.5 million favorable discrete adjustment relating to filing the 2013 federal income tax return, whereas the tax return filing adjustment was unfavorable in the prior year. The effective income tax rate for the nine months ended September 30, 2014 includes $1.3 million of favorable discrete adjustments from the resolution of tax audits, the effects from tax legislation and a favorable tax return filing adjustment.

	In the normal course of business, the Company is subject to examination by taxing authorities. The Internal Revenue Service (IRS) recently completed their examination of the Company’s income tax return for 2012. An IRS examination of U.S. Corrugated’s (a business acquired by the Company in October 2011) tax returns for 2009 through 2011 is nearing completion. No adjustments are anticipated from these examinations. State income tax years are generally open beginning with 2010.

Net_Income_per_Share

Net Income per Share	9 Months Ended
	Sep. 30, 2014
Net Income per Share	'
Net Income per Share	'
	8.Net Income per Share

	Basic and diluted net income per share is calculated as follows (In thousands, except for share and per share data):

		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Net income	$	54,254	$	44,414	$	137,812	$	83,864
	Weighted-average number of common shares for basic net income per share	95,958,877		95,457,816		95,857,079		95,200,896
	Incremental effect of dilutive common stock equivalents:
	Unexercised stock options	1,196,617		1,131,430		1,198,418		1,007,752
	Unvested restricted stock awards	360,407		407,894		361,372		446,428
	Weighted-average number of shares for diluted net income per share	97,515,901		96,997,140		97,416,869		96,655,076

	Net income per share - basic	$	0.57	$	0.47	$	1.44	$	0.88
	Net income per share - diluted	$	0.56	$	0.46	$	1.41	$	0.87

	Approximately 42,000 and 23,000 of unexercised stock options were outstanding at September 30, 2014 and 2013, respectively, but were not included in the computation of diluted earnings per share because the options were anti-dilutive.

	On December 11, 2013, the board of directors declared a two-for-one stock split in the form of a stock dividend on the Company’s common stock. To implement the stock split, shares of common stock were distributed on January 7, 2014 to all shareholders of record as of the close of business on December 23, 2013. All shares and earnings per share amounts for the three and nine month periods ended September 30, 2013 have been restated to reflect this change.

Pension_Plan_and_PostRetiremen

Pension Plan and Post-Retirement Benefits	9 Months Ended
	Sep. 30, 2014
Pension Plan and Post-Retirement Benefits	'
Pension Plan and Post-Retirement Benefits	'
	9.Pension Plan and Post-Retirement Benefits

	Defined Benefit Plans

	Net pension (benefit) / cost recognized for the three and nine months ended September 30, 2014 and 2013 for the Pension Plans are as follows:

		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Service cost for benefits earned during the quarter	$	2,448		$	2,845		$	7,346		$	5,083
	Interest cost on projected benefit obligations	7,180			5,918			21,540			6,512
	Expected return on plan assets	(11,030		)	(9,227		)	(33,091		)	(9,841		)
	Amortization of net loss	—			73			—			217
	Amortization of prior service cost	101			33			302			98
	Net pension (benefit) / cost - Company plans	(1,301		)	(358		)	(3,903		)	2,069
	Net pension cost - multi -employer plan	82			66			247			96
	Total net pension (benefit) / cost	$	(1,219	)	$	(292	)	$	(3,656	)	$	2,165

	The year-over-year change in total net pension benefit is a result of two pension plans acquired as part of the Longview acquisition.

	KapStone funds the Pension Plans according to IRS funding requirements. Based on those requirements, KapStone funded $3.2 million for the nine months ended September 30, 2014 and expects to fund an additional $0.4 million to the Pension Plans in 2014.

	Defined Contribution Plan

	We offer a 401(k) Defined Contribution Plan (“Contribution Plan”) to eligible employees. The Company’s monthly contributions are based on the matching of certain employee contributions or based on a union negotiated formula. For the three months ended September 30, 2014 and 2013, the Company recognized expense of $3.6 million and $3.3 million, respectively, for the Company contributions to the Contribution Plan. For the nine months ended September 30, 2014 and 2013, the Company recognized expense of $11.8 million and $9.1 million, respectively, for the Company contributions to this plan.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2014
Stock-Based Compensation	'
Stock-Based Compensation	'
	10.Stock-Based Compensation

	On May 15, 2014, stockholders of the Company approved the 2014 Incentive Plan (“2014 Plan”). The major changes included in the 2014 Plan are:

		·		An increase in the maximum number of shares to 8,500,000 of our common stock which will initially be available for all awards, subject to adjustment in the event of certain corporate transactions described in the 2014 Plan.
		·		To the extent the Company grants a stock option or SAR under the 2014 Plan, the number of shares of common stock that remain available for future grants will be reduced by an amount equal to the number of shares subject to such stock option or SAR.
		·		To the extent the Company grants restricted stock or a restricted stock unit (collectively, “Stock Awards”) under the 2014 Plan, the number of shares of common stock that remain available for future grants will be reduced by an amount equal to two times the number of shares subject to such Stock Award.

	Under the 2014 Plan, awards may be granted to employees, officers and directors of, and consultants and advisors to, the Company.

	In the quarter ended March 31, 2014, the compensation committee of the board of directors approved stock-based awards to executive officers, certain employees and directors. The 2014 awards included 441,415 stock option grants and 156,787 restricted stock units.

	The Company accounts for stock-based awards in accordance with ASC 718, “Compensation — Stock Compensation,” which requires that the cost resulting from all share-based payment transactions be recognized as compensation cost over the vesting period based on the fair value of the instrument on the date of grant.

	Total stock-based compensation expense related to the stock option and restricted stock unit grants for the three and nine months ended September 30, 2014 and 2013 is as follows:

			Three Months Ended September 30,						Nine Months Ended September 30,
			2014			2013			2014			2013
	Stock option compensation expense		$	740		$	535		$	2,938		$	2,312
	Restricted stock unit compensation expense		661			437			2,692			1,959
	Total stock-based compensation expense		$	1,401		$	972		$	5,630		$	4,271

	Total unrecognized stock-based compensation cost related to the stock option grants and restricted stock units as of September 30, 2014 and December 31, 2013 is as follows:


			September 30,			December 31,
			2014			2013
	Unrecognized stock option compensation expense		$	3,694		$	2,250
	Unrecognized restricted stock unit compensation expense		4,306			2,535
	Total unrecognized stock-based compensation expense		$	8,000		$	4,785

	As of September 30, 2014, total unrecognized compensation cost related to non-vested stock options and restricted stock units is expected to be recognized over a weighted average period of 1.8 years and 2.0 years, respectively.

	Stock Options

	Stock option awards vest as follows: 50% after two years and the remaining 50% after three years or upon a grantee of such stock options attaining the age 65. The stock options awarded in 2014 have a contractual term of ten years and are subject to forfeiture should the recipient terminate his or her employment with the Company for certain reasons prior to vesting in his or her awards, or the occurrence of certain other events such as termination with cause. The exercise price of these stock options is based on the closing market price of our common stock on the date of grant ($30.40 is the weighted average price for the 2014 awards described above) and compensation expense is recorded on an accelerated basis over the awards’ vesting periods.

	The weighted average fair value of the stock options granted in March 2014 and 2013 was $10.36 and $5.41, respectively. The fair value was calculated using the Black-Scholes option-pricing model based on the market price at the grant date and the weighted average assumptions specific to the underlying options. For the nine months ended September 30, 2014, the expected term used by the Company is based on the historical average life of stock option awards. The expected volatility assumption is based on the volatility of our common stock from the same time period as the expected term of the stock options. The risk-free interest rate was selected based upon yields of U.S. Treasury issues with a term similar to the expected life of the stock options. The assumptions utilized for calculating the fair value of stock options during the period are as follows:

			Nine Months Ended September 30,
			2014		2013
	Stock Options Black-Scholes assumptions (weighted average):
	Expected volatility		39.93	%	49.39	%
	Expected life (years)		4.30		4.00
	Risk-free interest rate		1.34	%	0.63	%
	Expected Dividend yield		—	%	—	%

	The following table summarizes stock options amounts and activity:

					Weighted			Weighted		Intrinsic
					Average			Average		Value
					Exercise			Remaining		(dollars in
			Options		Price			Life (Years)		thousands)
	Outstanding at January 1, 2014		2,514,382		$	8.05		7.4		$	49,977
	Granted		441,415		30.4
	Exercised		(129,316	)	5.22
	Forfeited		(15,645	)	17.99
	Outstanding at September 30, 2014		2,810,836		$	11.64		7		$	46,966
	Exercisable at September 30, 2014		1,539,808		$	5.87		5.8		$	34,061

	For the three and nine months ended September 30, 2014, cash proceeds from the exercise of stock options totaled $0.2 million and $0.6 million, respectively. For the three and nine months ended September 30, 2013, cash proceeds from the exercise of stock options totaled $0.6 million and $1.6 million, respectively.

	Restricted Stock

Restricted stock units are restricted as to transferability until they vest three years from the grant date or upon a grantee of such restricted stock units attaining the age 65. These restricted stock units are subject to forfeiture should applicable employees terminate their employment with the Company for certain reasons prior to vesting in their awards, or the occurrence of certain other events. The value of these restricted stock units is based on the closing market price of our common stock on the date of grant and compensation expense is recorded on a straight-line basis over the awards’ vesting periods.

The following table summarizes unvested restricted stock units amounts and activity:

				Weighted
				Average
				Grant Date
		Units		Fair Value
Outstanding at January 1, 2014		687,368		$	10.91
Granted		156,787		30.42
Vested		(244,247	)	8.91
Forfeited		(7,471	)	16.03
Outstanding at September 30, 2014		592,437		$	16.83

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2014
Commitments and Contingencies	'
Commitments and Contingencies	'
	11.Commitments and Contingencies

	We are subject to various legal proceedings arising from our operations. We establish reserves for claims and proceedings when it is probable that liabilities exist and reasonable estimates of loss can be made. While it is not possible to predict the outcome of these matters, based on our assessment of the facts and circumstances now known, we do not believe that these matters, individually or in the aggregate, will have a material adverse effect on our financial position. However, actual outcomes may be different from those expected and could have a material effect on our results of operations or cash flows in a particular period.

	There have been no material changes in any of our legal proceedings since December 31, 2013.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2014
Segment Information	'
Segment Information	'
	12.Segment Information

	The Company has one operating segment. The Company produces containerboard, corrugated products, and specialty paper which are sold to customers who convert our products into end-market finished products or internally to corrugating plants which produce a wide variety of products ranging from basic corrugated shipping containers to specialized packaging.

	The Company’s identification of one operating segment is based on financial information regularly evaluated by the chief operating decision maker in determining resource allocation and assessing performance, in accordance with Accounting Standards Codification 805, Segment Reporting.

	Net sales by product line for the three and nine months ended September 30, 2014 and 2013 are as follows:

		Three Months Ended September 30,				Increase/		Nine Months Ended September 30,				Increase/
	Net sales by product line:	2014		2013		(Decrease)		2014		2013		(Decrease)
	Containerboard / Corrugated products	$	392,886	$	348,412	$	44,474	$	1,102,046	$	753,182	$	348,864
	Specialty paper	180,725		167,392		13,333		562,811		366,330		196,481
	Other	24,495		22,799		1,696		72,650		65,225		7,425
	Total	$	598,106	$	538,603	$	59,503	$	1,737,507	$	1,184,737	$	552,770

	In the three and nine months ended September 30, 2014, the increase in net sales was driven primarily by the Longview acquisition which accounted for $43.0 million and $510.2 million of net sales, respectively.

Voluntary_Separation_Plan

Voluntary Separation Plan	9 Months Ended
Voluntary Separation Plan	Sep. 30, 2014
Voluntary Separation Plan	'
Voluntary Separation Plan	'
	13.Voluntary Separation Plan

	In February 2014, the Company offered a voluntary separation plan to a specific identified group of employees. The employees were given a limited timeframe to review the offer and to communicate their acceptance. As of September 30, 2014, 41 employees have accepted the offer and the Company has reserved $6.3 million with respect to this separation plan. Payments charged against the reserve for the three and nine months ended September 30, 2014 totaled $1.0 million and $1.4 million, respectively.

Subsequent_Event

Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2014
Subsequent Events	'
Subsequent Events	'
	14.Subsequent Event

	The Company’s paper mill in Roanoke Rapids, North Carolina completed its annual planned maintenance outage in October 2014. The outage lasted approximately 9 days with an estimated cost of $8.5 million primarily for annual maintenance and inspections, and the fixed cost impact associated with lost paper production and a 11,200 reduction in tons produced. In October 2013, the annual planned maintenance outage lasted 9 days with a cost of $8.0 million primarily for annual maintenance and inspections, and the fixed cost impact associated with lost paper production and a 10,500 reduction in tons produced.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements (Policies)	9 Months Ended
Recent Accounting Pronouncements (Policies)	Sep. 30, 2014
Recent Accounting Pronouncements	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements

	In May 2014, the Financial Accounting Standards Board (“FASB’) issued Accounting Standards Update (“ASU”) No. 2014-09 “Revenue from Contracts with Customers”. The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The guidance in this update supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) Topic 605, “Revenue Recognition”, and most industry-specific guidance throughout the Industry Topics of the Codification. Additionally, this update supersedes some cost guidance included in Subtopic 605-35, “Revenue Recognition—Construction-Type and Production-Type Contracts”. For a public entity, the amendments are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. The ASU allows for full or modified retrospective adoption. Early application is not permitted. The Company is currently evaluating the expected impact of adopting this standard.

	In July 2013, the FASB issued ASU No. 2013-11 “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists”. ASU No. 2013-11 amends the guidance within ASC Topic 740, “Income Taxes”, to require entities to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The Company adopted ASU No. 2013-11 beginning in the first quarter of 2014 with no impact on the consolidated financial statements.

Longview_Acquisition_Tables

Longview Acquisition (Tables)	9 Months Ended
Longview Acquisition (Tables)	Sep. 30, 2014
Longview Acquisition	'
Summary of estimated fair value of the assets acquired and liabilities assumed as well as adjustments made	'
	The following table summarizes the estimated fair value of the assets acquired and liabilities assumed by major category of assets and liabilities as of December 31, 2013, as well as adjustments (referred to as “measurement period adjustments”):

			Amounts						Amounts
			Recognized as of			Measurement			Recognized as of
			Acquisition Date			Period			Acquisition Date
			(as Adjusted) (1)			Adjustments (2)			(as Adjusted)
	Deposit for redemption of senior notes		$	507,520		$	—		$	507,520
	Trade accounts receivable		104,929			42			104,971
	Inventories		106,805			(2,026		)	104,779
	Prepaid expenses and other current assets		2,554			—			2,554
	Plant, property and equipment		800,663			(7,446		)	793,217
	Pension asset		112,141			—			112,141
	Other receivables and assets		11,863			—			11,863
	Intangible assets		77,600			—			77,600
	Accounts payable		(71,663		)	—			(71,663		)
	Accrued expenses		(17,630		)	80			(17,550		)
	Accrued compensation costs		(19,385		)	61			(19,324		)
	Debt		(507,520		)	—			(507,520		)
	Pension and post retirement benefits		(68,105		)	—			(68,105		)
	Deferred income taxes		(294,086		)	3,953			(290,133		)
	Other noncurrent liabilities		(2,862		)	—			(2,862		)
	Goodwill		302,935			5,336			308,271
	Total acquisition consideration		$	1,045,759		$	—		$	1,045,759

		-1		As previously reported in the Notes to Consolidated Financial Statements included in our 2013 Form 10-K.

		-2		The measurement period adjustments include the following:

		·		Property, plant, and equipment were adjusted downward by $7.4 million to reflect the change in fair value estimates for certain acquired equipment.
		·		Inventories were adjusted by $2.0 million downward to reflect better estimates for replacement parts and supplies.
		·		Deferred income taxes decreased primarily due to the change in property, plant, and equipment and inventories.

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventories	'
Schedule of Inventories	'

		(unaudited)
		September 30,		December 31,
		2014		2013
	Raw materials	$	90,329	$	83,136
	Work in process	3,648		3,293
	Finished goods	66,651		58,336
	Replacement parts and supplies	68,829		66,842
	Inventory at FIFO costs	229,457		211,607
	LIFO inventory reserves	3,121		5,775
	Inventories	$	232,578	$	217,382

Shortterm_Borrowings_and_Longt1

Short-term Borrowings and Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Short-term Borrowings and Long-term Debt	'
Schedule of long-term debt	'

		(unaudited)
		September 30,			December 31,
		2014			2013
	Term loan A-1 under Amended and Restated Credit Agreement with interest payable monthly at LIBOR plus 1.75% at Septemer 30, 2014	$	704,938		$	754,938
	Term loan A-2 under Amended and Restated Credit Agreement with interest payable monthly at LIBOR plus 2.0% at September 30, 2014	340,300			468,825
	Receivables Credit Facility with interest payable monthly at LIBOR plus 0.75% at September 30, 2014	175,000			—
	Total long-term debt	1,220,238			1,223,763
	Less current portion of debt	—			(4,950		)
	Less unamortized debt issuance costs	(19,960		)	(26,400		)
	Long-term debt, net of current portion and debt issuance costs	$	1,200,278		$	1,192,413

Net_Income_per_Share_Tables

Net Income per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Net Income per Share	'
Schedule of basic and diluted net income per share	'

	Basic and diluted net income per share is calculated as follows (In thousands, except for share and per share data):

		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Net income	$	54,254	$	44,414	$	137,812	$	83,864
	Weighted-average number of common shares for basic net income per share	95,958,877		95,457,816		95,857,079		95,200,896
	Incremental effect of dilutive common stock equivalents:
	Unexercised stock options	1,196,617		1,131,430		1,198,418		1,007,752
	Unvested restricted stock awards	360,407		407,894		361,372		446,428
	Weighted-average number of shares for diluted net income per share	97,515,901		96,997,140		97,416,869		96,655,076

	Net income per share - basic	$	0.57	$	0.47	$	1.44	$	0.88
	Net income per share - diluted	$	0.56	$	0.46	$	1.41	$	0.87

Pension_Plan_and_PostRetiremen1

Pension Plan and Post-Retirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2014
Pension Plan and Post-Retirement Benefits	'
Schedule of net pension (benefit) / cost recognized for the Pension Plans	'

		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Service cost for benefits earned during the quarter	$	2,448		$	2,845		$	7,346		$	5,083
	Interest cost on projected benefit obligations	7,180			5,918			21,540			6,512
	Expected return on plan assets	(11,030		)	(9,227		)	(33,091		)	(9,841		)
	Amortization of net loss	—			73			—			217
	Amortization of prior service cost	101			33			302			98
	Net pension (benefit) / cost - Company plans	(1,301		)	(358		)	(3,903		)	2,069
	Net pension cost - multi -employer plan	82			66			247			96
	Total net pension (benefit) / cost	$	(1,219	)	$	(292	)	$	(3,656	)	$	2,165

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
Stock-Based Compensation (Tables)	Sep. 30, 2014
Stock-Based Compensation	'
Schedule of total stock-based compensation expense	'

		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Stock option compensation expense	$	740		$	535		$	2,938		$	2,312
	Restricted stock unit compensation expense	661			437			2,692			1,959
	Total stock-based compensation expense	$	1,401		$	972		$	5,630		$	4,271


Schedule of total unrecognized stock-based compensation	'

		September 30,			December 31,
		2014			2013
	Unrecognized stock option compensation expense	$	3,694		$	2,250
	Unrecognized restricted stock unit compensation expense	4,306			2,535
	Total unrecognized stock-based compensation expense	$	8,000		$	4,785


Schedule of the assumptions utilized for calculating the fair value of stock options	'

		Nine Months Ended September 30,
		2014		2013
	Stock Options Black-Scholes assumptions (weighted average):
	Expected volatility	39.93	%	49.39	%
	Expected life (years)	4.30		4.00
	Risk-free interest rate	1.34	%	0.63	%
	Expected Dividend yield	—	%	—	%


Summary of stock options amounts and activity	'

				Weighted			Weighted		Intrinsic
				Average			Average		Value
				Exercise			Remaining		(dollars in
		Options		Price			Life (Years)		thousands)
	Outstanding at January 1, 2014	2,514,382		$	8.05		7.4		$	49,977
	Granted	441,415		30.4
	Exercised	(129,316	)	5.22
	Forfeited	(15,645	)	17.99
	Outstanding at September 30, 2014	2,810,836		$	11.64		7		$	46,966
	Exercisable at September 30, 2014	1,539,808		$	5.87		5.8		$	34,061



Summary of unvested restricted stock units amounts and activity	'

				Weighted
				Average
				Grant Date
		Units		Fair Value
	Outstanding at January 1, 2014	687,368		$	10.91
	Granted	156,787		30.42
	Vested	(244,247	)	8.91
	Forfeited	(7,471	)	16.03
	Outstanding at September 30, 2014	592,437		$	16.83

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Information	'
Schedule of net sales by product line	'

		Three Months Ended September 30,				Increase/		Nine Months Ended September 30,				Increase/
	Net sales by product line:	2014		2013		(Decrease)		2014		2013		(Decrease)
	Containerboard / Corrugated products	$	392,886	$	348,412	$	44,474	$	1,102,046	$	753,182	$	348,864
	Specialty paper	180,725		167,392		13,333		562,811		366,330		196,481
	Other	24,495		22,799		1,696		72,650		65,225		7,425
	Total	$	598,106	$	538,603	$	59,503	$	1,737,507	$	1,184,737	$	552,770

Longview_Acquisition_Details

Longview Acquisition (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Jul. 18, 2013	Dec. 31, 2013	Jul. 18, 2013	Dec. 31, 2013	Dec. 31, 2013
			Longview	Longview	Longview	Longview	Longview
			item			Amounts Recognized as of Acquisition Date	Measurement Period Adjustments
			T
Longview Acquisition	'	'	'	'	'	'	'
Percentage of interest acquired in acquisition transaction	'	'	'	'	100.00%	'	'
Purchase price	'	'	$1,025,000,000	'	'	'	'
Working capital adjustments	'	'	41,500,000	'	'	'	'
Number of paper machines	'	'	5	'	'	'	'
Annual production capacity of paper machines (in tons)	'	'	1,300,000	'	'	'	'
Number of converting facilities located in Pacific Northwest	'	'	7	'	'	'	'
Fair value of the assets acquired and liabilities assumed	'	'	'	'	'	'	'
Deposit for redemption of Senior notes	'	'	'	507,520,000	'	507,520,000	'
Trade accounts receivable	'	'	'	104,971,000	'	104,929,000	42,000
Inventories	'	'	'	104,779,000	'	106,805,000	-2,026,000
Prepaid expenses and other current assets	'	'	'	2,554,000	'	2,554,000	'
Plant, property and equipment	'	'	'	793,217,000	'	800,663,000	-7,446,000
Pension asset	'	'	'	112,141,000	'	112,141,000	'
Other receivables and assets	'	'	'	11,863,000	'	11,863,000	'
Intangible assets	'	'	'	77,600,000	'	77,600,000	'
Accounts payable	'	'	'	-71,663,000	'	-71,663,000	'
Accrued expenses	'	'	'	-17,550,000	'	-17,630,000	80,000
Accrued compensation costs	'	'	'	-19,324,000	'	-19,385,000	61,000
Debt	'	'	'	-507,520,000	'	-507,520,000	'
Pension and post retirement benefits	'	'	'	-68,105,000	'	-68,105,000	'
Deferred income taxes	'	'	'	-290,133,000	'	-294,086,000	3,953,000
Other noncurrent liabilities	'	'	'	-2,862,000	'	-2,862,000	'
Goodwill	533,851,000	528,515,000	'	308,271,000	'	302,935,000	5,336,000
Total acquisition consideration	'	'	'	$1,045,759,000	'	$1,045,759,000	'

Annual_Planned_Maintenance_Out1

Annual Planned Maintenance Outages (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Annual planned maintenance outage costs	$5.20	$1.10	$25.10	$14.30
North Charleston, South Carolina	'	'	'	'
Annual planned maintenance outage costs	'	'	5.6	'
Reduction in production (in tons)	'	'	19,700	'
Tri-annual planned maintenance outage costs	'	'	'	5
Longview, Washington	'	'	'	'
Annual planned maintenance outage costs	'	'	$10	'
Reduction in production (in tons)	'	'	9,400	'

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventories	'	'
Raw materials	$90,329	$83,136
Work in process	3,648	3,293
Finished goods	66,651	58,336
Replacement parts and supplies	68,829	66,842
Inventory at FIFO costs	229,457	211,607
LIFO inventory reserves	3,121	5,775
Inventories	232,578	217,382
Longview	'	'
Inventories	'	'
Inventories	$112,600	'

Shortterm_Borrowings_and_Longt2

Short-term Borrowings and Long-term Debt (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Apr. 30, 2014

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Level 2

Receivables Credit Facility

Credit Facility

Revolver

Term Loans

Term loan A-1

Term loan A-2

Other Borrowing

LIBOR

Short-term Borrowings and Long-term Debt

Term of debt instrument

'1 year

Maximum borrowing capacity

$175,000,000

$400,000,000

Amount outstanding

175,000,000

Debt issuance costs

400,000

700,000

Repayments of long-term debt

178,525,000

305,313,000

175,000,000

Loss on debt extinguishment

-2,963,000

3,000,000

Long-term debt

1,220,238,000

1,223,763,000

175,000,000

704,938,000

754,938,000

340,300,000

468,825,000

Less current portion of debt

-4,950,000

Less unamortized debt issuance costs

-19,960,000

-26,400,000

Long-term debt, net of current portion and debt issuance costs

1,200,278,000

1,192,413,000

Average weighted interest rate (as a percent)

1.83%

2.00%

2.25%

Reduction in unused commitment fees (as a percent)

0.05%

Unused Fee Rate (as a percent)

0.10%

Current availability under borrowing base

395,000,000

Fair value of debt

1,200,000,000

Initial aggregate principal amount

6,300,000

5,100,000

Interest Rate (as a percent)

1.69%

1.61%

Other current borrowings

$1,162,000

$1,200,000

$1,400,000

Margin interest above reference rate (as a percent)

0.75%

1.75%

2.00%

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes	'	'	'	'
Effective income tax rate (as a percent)	33.90%	37.90%	33.90%	36.20%
U.S. federal statutory income tax rate (as a percent)	'	'	35.00%	35.00%
Difference of effective tax rate from the statutory federal income tax rate	'	'	'	'
Favorable adjustment due to prior return	$0.50	'	'	'
Favorable adjustment due to settlement	'	'	$1.30	'

Net_Income_per_Share_Details

Net Income per Share (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 11, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income per Share	'	'	'	'	'
Net income	'	$54,254	$44,414	$137,812	$83,864
Weighted-average number of common shares for basic net income per share	'	95,958,877	95,457,816	95,857,079	95,200,896
Incremental effect of dilutive common stock equivalents:	'	'	'	'	'
Unexercised stock options (in shares)	'	1,196,617	1,131,430	1,198,418	1,007,752
Unvested restricted stock awards (in shares)	'	360,407	407,894	361,372	446,428
Weighted-average number of shares for diluted net income per share	'	97,515,901	96,997,140	97,416,869	96,655,076
Net income per share - basic (in dollars per share)	'	$0.57	$0.47	$1.44	$0.88
Net income per share - diluted (in dollars per share)	'	$0.56	$0.46	$1.41	$0.87
Anti-dilutive unexercised stock options (in shares)	'	'	'	42,000	23,000
Stock split ratio	2	'	'	'	'

Pension_Plan_and_PostRetiremen2

Pension Plan and Post-Retirement Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Sep. 30, 2014	Sep. 30, 2013	item	Sep. 30, 2013
Pension Plan and Post-Retirement Benefits	'	'	'	'
Number of pension plans acquired through acquisition	'	'	2	'
Net pension (benefit) / cost recognized for the Pension Plans	'	'	'	'
Service cost for benefits earned during the quarter	$2,448,000	$2,845,000	$7,346,000	$5,083,000
Interest cost on projected benefit obligations	7,180,000	5,918,000	21,540,000	6,512,000
Expected return on plan assets	-11,030,000	-9,227,000	-33,091,000	-9,841,000
Amortization of net loss (gain)	'	73,000	'	217,000
Amortization of prior service cost (benefit)	101,000	33,000	302,000	98,000
Net pension (benefit) / cost - Company plan	-1,301,000	-358,000	-3,903,000	2,069,000
Net pension cost - multi-employer plan	82,000	66,000	247,000	96,000
Total benefit cost	-1,219,000	-292,000	-3,656,000	2,165,000
Employer contributions	'	'	3,200,000	'
Expected employer contribution in remaining fiscal year	'	'	$400,000	'

Pension_Plan_and_PostRetiremen3

Pension Plan and Post-Retirement Benefits (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Pension Plan and Post-Retirement Benefits	'	'	'	'
Defined contribution plan expense recognized	$3.60	$3.30	$11.80	$9.10

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

15-May-14

Mar. 31, 2014

Mar. 31, 2013

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

2014 Incentive Plan Member

Stock Options

Restricted Stock Units

Awards that vest after two years

Awards that vest after three years

Stock-based compensation

Number of shares authorized by shareholders

8,500,000

Multiple to reduce available shares

Stock-based compensation expense

$1,401,000

$972,000

$5,630,000

$4,271,000

$740,000

$535,000

$2,938,000

$2,312,000

$661,000

$437,000

$2,692,000

$1,959,000

Unrecognized stock-based compensation expense

Unrecognized stock option compensation expense

3,694,000

2,250,000

Unrecognized restricted stock unit compensation expense

4,306,000

2,535,000

Total unrecognized stock-based compensation expense

8,000,000

4,785,000

Weighted average period of recognition

'1 year 9 months 18 days

'2 years

Stock Options

Percentage of granted awards that will vest

50.00%

Vesting period for awards

'2 years

'3 years

Minimum age requirement of grantee as a condition for vesting

'65 years

Granted (in dollars per share)

$30.40

Weighted average fair value (in dollars per share)

$10.36

$5.41

Stock Options Black-Scholes assumptions (weighted average):

Expected volatility (as a percent)

39.93%

49.39%

Expected life

'4 years 3 months 18 days

'4 years

Risk-free interest rate (as a percent)

1.34%

0.63%

Expected dividend yield

0.00%

Options

Outstanding at the beginning of the period (in shares)

2,514,382

Granted (in shares)

441,415

Exercised (in shares)

-129,316

Forfeited (in shares)

-15,645

Outstanding at the end of the period (in shares)

2,810,836

2,514,382

Exercisable at the end of the period (in shares)

1,539,808

Weighted Average Exercise Price

Outstanding at the beginning of the period (in dollars per share)

$8.05

Granted (in dollars per share)

$30.40

Exercised (in dollars per share)

$5.22

Forfeited (in dollars per share)

$17.99

Outstanding at the end of the period (in dollars per share)

$11.64

$8.05

Exercisable at the end of the period (in dollars per share)

$5.87

Weighted Average Remaining Life (Years)

Outstanding at the end of the period

'7 years

'7 years 4 months 24 days

Exercisable at the end of the period

'5 years 9 months 18 days

Intrinsic Value

Outstanding at the end of the period

46,966,000

49,977,000

Exercisable at the end of the period

34,061,000

Cash proceeds from exercises of options

$200,000

$600,000

$1,600,000

Units

Outstanding at the beginning of the period (in shares)

687,368

Granted (in shares)

156,787

Vested (in shares)

-244,247

Forfeited (in shares)

-7,471

Outstanding at the end of the period (in shares)

592,437

Weighted Average Grant Date Fair Value

Outstanding at the beginning of the period (in dollars per share)

$10.91

Granted (in dollars per share)

$30.42

Vested (in dollars per share)

$8.91

Forfeited (in dollars per share)

$16.03

Outstanding at the end of the period (in dollars per share)

$16.83

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Sep. 30, 2014	Sep. 30, 2013	item	Sep. 30, 2013
Segment Information	'	'	'	'
Number of operating segments	'	'	1	'
Segment Information	'	'	'	'
Net sales by product line: Total	$598,106	$538,603	$1,737,507	$1,184,737
Increase/(Decrease) in net sales	59,503	'	552,770	'
Longview	'	'	'	'
Segment Information	'	'	'	'
Increase/(Decrease) in net sales	43,000	'	510,200	'
Containerboard / Corrugated products	'	'	'	'
Segment Information	'	'	'	'
Net sales by product line: Total	392,886	348,412	1,102,046	753,182
Increase/(Decrease) in net sales	44,474	'	348,864	'
Specialty paper	'	'	'	'
Segment Information	'	'	'	'
Net sales by product line: Total	180,725	167,392	562,811	366,330
Increase/(Decrease) in net sales	13,333	'	196,481	'
Other	'	'	'	'
Segment Information	'	'	'	'
Net sales by product line: Total	24,495	22,799	72,650	65,225
Increase/(Decrease) in net sales	$1,696	'	$7,425	'

Voluntary_Separation_Plan_Deta

Voluntary Separation Plan (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014
			Employee Severance [Member]	Employee Severance [Member]
				item
Voluntary Separation Plan	'	'	'	'
Number of employees accepting the plan	'	'	'	41
Voluntary separation reserve	$58,928,000	$54,871,000	$6,300,000	$6,300,000
Changes against the reserve	'	'	$1,000,000	$1,400,000

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Oct. 31, 2014	Oct. 31, 2013
					Roanoke Rapids, North Carolina	Roanoke Rapids, North Carolina
					T	T
Subsequent events	'	'	'	'	'	'
Period for which outage lasted	'	'	'	'	'9 days	'9 days
Annual planned maintenance outage costs	$5.20	$1.10	$25.10	$14.30	$8.50	$8
Reduction in production (in tons)	'	'	'	'	11,200	10,500