Continental Building Products (CBPX) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 02, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	CBPX
Entity Registrant Name	CONTINENTAL BUILDING PRODUCTS, INC.
Entity Central Index Key	1,592,480
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (shares)		38,420,573

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 120,630	$ 117,115	$ 241,245	$ 228,600
Costs, expenses and other income:
Cost of goods sold	89,817	83,744	179,441	163,699
Selling and administrative	9,193	10,163	18,497	19,123
Total costs and operating expenses	99,010	93,907	197,938	182,822
Operating income	21,620	23,208	43,307	45,778
Other (expense)/income, net	(135)	6	(779)	160
Interest expense, net	(3,062)	(3,648)	(5,978)	(7,346)
Income before income/(losses) from equity method investment and provision for income tax	18,423	19,566	36,550	38,592
Income/(losses) from equity method investment	345	(240)	175	(435)
Income before provision for income taxes	18,768	19,326	36,725	38,157
Provision for income taxes	(6,370)	(6,604)	(12,100)	(12,934)
Net income	$ 12,398	$ 12,722	$ 24,625	$ 25,223
Net income per share:
Basic (usd per share)	$ 0.32	$ 0.31	$ 0.63	$ 0.61
Diluted (usd per share)	$ 0.32	$ 0.31	$ 0.62	$ 0.61
Weighted average shares outstanding:
Basic (shares)	39,125,571	40,670,650	39,349,674	41,097,472
Diluted (shares)	39,210,219	40,717,162	39,454,928	41,128,466

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 12,398	$ 12,722	$ 24,625	$ 25,223
Foreign currency translation adjustment	440	16	564	1,123
Net unrealized (losses)/gains on derivatives, net of tax	(598)	336	(578)	161
Other comprehensive income	(158)	352	(14)	1,284
Comprehensive income	$ 12,240	$ 13,074	$ 24,611	$ 26,507

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 55,847	$ 51,536
Receivables, net	37,411	32,473
Inventories, net	27,111	25,239
Prepaid and other current assets	5,862	7,485
Total current assets	126,231	116,733
Property, plant and equipment, net	297,931	307,838
Customer relationships and other intangibles, net	75,522	81,555
Goodwill	119,945	119,945
Equity method investment	8,628	8,020
Debt issuance costs	568	658
Total Assets	628,825	634,749
Liabilities:
Accounts payable	26,262	27,411
Accrued and other liabilities	10,328	12,321
Notes payable, current portion	1,720	1,742
Total current liabilities	38,310	41,474
Deferred taxes and other long-term liabilities	19,251	19,643
Notes payable, non-current portion	263,776	264,620
Total Liabilities	321,337	325,737
Equity:
Undesignated preferred stock, par value $0.001 per share; 10,000,000 shares authorized, no shares issued and outstanding at June 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value per share; 190,000,000 shares authorized; 44,304,664 and 44,191,370 shares issued at June 30, 2017 and December 31, 2016, respectively; 38,655,886 and 39,691,715 shares outstanding at June 30, 2017 and December 31, 2016, respectively	44	44
Additional paid-in capital	324,086	322,384
Less: Treasury stock	(116,592)	(88,756)
Accumulated other comprehensive loss	(3,423)	(3,409)
Accumulated earnings	103,373	78,749
Total Equity	307,488	309,012
Total Liabilities and Equity	$ 628,825	$ 634,749

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Undesignated preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Undesignated preferred stock, shares authorized	10,000,000	10,000,000
Undesignated preferred stock, shares issued	0	0
Undesignated preferred stock, shares outstanding	0	0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares issued	44,304,664	44,191,370
Common stock, shares outstanding	38,655,886	39,691,715

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 24,625	$ 25,223
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,760	23,788
Bad debt expense	22	28
Amortization of debt issuance costs and debt discount	586	1,207
Loss on disposal of property, plant and equipment	18	41
(Income)/losses from equity method investment	(175)	435
Loss on debt extinguishment	686	0
Stock-based compensation	1,479	1,152
Deferred taxes	92	268
Change in assets and liabilities:
Receivables	(4,964)	(1,973)
Inventories	(1,811)	1,053
Prepaid expenses and other current assets	966	(534)
Accounts payable	(564)	(620)
Accrued and other current liabilities	(2,038)	(152)
Other long term liabilities	(188)	(413)
Net cash provided by operating activities	42,494	49,503
Cash flows from investing activities:
Capital expenditures	(8,070)	(1,765)
Software purchased or developed	(133)	(356)
Capital contributions to equity method investment	(647)	(226)
Distributions from equity method investment	214	356
Net cash used in investing activities	(8,636)	(1,991)
Cash flows from financing activities:
Proceeds from exercise of stock options	230	20
Tax withholdings on share-based compensation	(240)	0
Proceeds from debt refinancing	273,625	0
Disbursements for debt refinancing	(273,625)	0
Payments of financing costs	(649)	0
Principal payments for debt	(1,368)	(25,000)
Payments to repurchase common stock	(27,836)	(22,010)
Net cash used in financing activities	(29,863)	(46,990)
Effect of foreign exchange rates on cash and cash equivalents	316	475
Net change in cash and cash equivalents	4,311	997
Cash, beginning of period	51,536	14,729
Cash, end of period	$ 55,847	$ 15,726

Background and Nature of Operat

Background and Nature of Operations	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Nature of Operations	BACKGROUND AND NATURE OF OPERATIONS Description of Business Continental Building Products, Inc. (the "Company") is a Delaware corporation. Prior to the acquisition of the gypsum division of Lafarge North America Inc. ("Lafarge N.A.") described below, the Company had no operating activity. The Company manufactures gypsum wallboard related products for commercial and residential buildings and houses. The Company operates a network of three highly efficient wallboard facilities, all located in the eastern United States, and produces joint compound at one plant in the United States and at another plant in Canada. The Acquisition On June 24, 2013 , Lone Star Fund VIII (U.S.), L.P., (along with its affiliates and associates, but excluding the companies that it owns as a result of its investment activity, “Lone Star”), entered into a definitive agreement with Lafarge N.A. to purchase the assets of its North American gypsum division for an aggregate purchase price of approximately $703 million (the "Acquisition") in cash. The closing of the Acquisition occurred on August 30, 2013 . Secondary Public Offerings On March 18, 2016, following a series of secondary offerings, LSF8 Gypsum Holdings, L.P. ("LSF8") sold its remaining 5,106,803 shares of the Company’s common stock at a price per share of $16.10 . Following the March 18, 2016 transaction and the concurrent repurchase by the Company of 900,000 shares of Company’s common stock from LSF8, to the best of the Company's knowledge, neither LSF8 nor any other affiliate of Lone Star held any shares of Company common stock. (See Note 11, Treasury Stock).

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES (a) Basis of Presentation The accompanying consolidated financial statements for the Company have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions have been eliminated. (b) Basis of Presentation for Interim Periods Certain information and footnote disclosures normally included for the annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted for the interim periods presented. Management believes that the unaudited interim financial statements include all adjustments (which are normal and recurring in nature) necessary to present fairly the financial position of the Company and the results of operations and cash flows for the periods presented. The results of operations for the periods presented are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. Seasonal changes and other conditions can affect the sales volumes of the Company’s products. Therefore, the financial results for any interim period do not necessarily indicate the expected results for the year. The financial statements should be read in conjunction with Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2016 included in the Company’s Annual Report on Form 10-K for the fiscal year then ended (the "2016 10-K"). The Company has continued to follow the accounting policies set forth in those financial statements. (c) Supplemental Cash Flow Disclosure Table 2.1: Certain Cash and Non-Cash Transactions For the Six Months Ended June 30, 2017 June 30, 2016 (in thousands) Cash paid during the period for: Interest paid on term loan $ 4,973 $ 5,876 Income taxes paid, net 10,259 12,160 Non-cash activity: Amounts in accounts payable for capital expenditures 1,899 547 (d) Recent Accounting Pronouncements Accounting Standards Adopted During the Period In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-11, "Inventory: Simplifying the Measurement of Inventory." This guidance applies to inventory valued at first-in, first-out (FIFO) or average cost and requires inventory to be measured at the lower of cost and net realizable value, rather than at the lower of cost or market. ASU 2015-11 is effective on a prospective basis for annual periods, including interim reporting periods within those periods, beginning after December 15, 2016. The Company values its inventory under the average cost method and thus will be required to adopt the standard. The Company adopted the new standard in the first quarter of 2017. The adoption of this standard did not have a material impact on the Company's Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting," which introduces targeted amendments intended to simplify the accounting for stock compensation. Specifically, the ASU requires all excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) to be recognized as income tax expense or benefit in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits, and assess the need for a valuation allowance, regardless of whether the benefit reduces taxes payable in the current period. That is, off-balance sheet accounting for net operating losses stemming from excess tax benefits would no longer be required and instead such net operating losses would be recognized when they arise. Existing net operating losses that are currently tracked off-balance sheet would be recognized, net of a valuation allowance if required, through an adjustment to opening retained earnings in the period of adoption. Entities will no longer need to maintain and track an "APIC pool." The ASU also requires excess tax benefits to be classified along with other income tax cash flows as an operating activity in the statement of cash flows. The amendments were effective for annual periods beginning after December 15, 2016. The Company adopted the new standard in the first quarter of 2017, which resulted in a favorable adjustment to income tax provision of $0.2 million . Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-9, "Revenue from Contracts with Customers (Topic 606)," which provides accounting guidance for all revenue arising from contracts with customers and affects all entities that enter into contracts to provide goods or services to their customers. In August 2015, the FASB issued ASU No. 2015-14, "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date," which defers the effective date of ASU No. 2014-9 for all entities by one year to annual reporting periods beginning after December 15, 2017. The ASU requires retroactive application on either a full or modified basis. The Company will adopt the standard on January 1, 2018. The Company has identified a project implementation team and has identified its revenue streams. The Company is in the process of evaluating the various aspects of the standard and how the standard may impact how the Company recognizes revenue. The Company is also evaluating the potential impact that the new guidance will have on its Consolidated Financial Statements. While the Company has not completed its analysis, the Company does not anticipate that the new guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is in the process of evaluating the impact of adoption, which is not expected to have a material impact on the Company's Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments." This ASU is intended to introduce a revised approach to the recognition and measurement of credit losses, emphasizing an updated model based on expected losses rather than incurred losses. The provisions of this standard are effective for reporting periods beginning after December 15, 2019 and early adoption is permitted. The Company is currently evaluating the impact that this guidance may have on its Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments." This ASU intends to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, "Intra-Entity Transfers of Assets Other Than Inventory." The new standard requires companies to recognize the income tax effects of intercompany sales or transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period the sales or transfer occurs. The standard requires companies to apply a modified retrospective approach with a cumulative catch-up adjustment to opening retained earnings in the period of adoption. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017- 04, "Intangibles - Goodwill and Other." This ASU simplifies the goodwill impairment calculation by eliminating the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of today’s goodwill impairment test) to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., Step 1 of today’s goodwill impairment test). The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements.

Receivables, Net

Receivables, Net	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Receivables, Net	RECEIVABLES, NET Table 3: Details of Receivables, Net June 30, 2017 December 31, 2016 (in thousands) Trade receivables, gross $ 38,169 $ 33,199 Allowance for cash discounts and doubtful accounts (758 ) (726 ) Receivables, net $ 37,411 $ 32,473 Trade receivables are recorded net of credit memos issued during the normal course of business.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	INVENTORIES, NET Table 4: Details of Inventories, Net June 30, 2017 December 31, 2016 (in thousands) Finished products $ 7,474 $ 7,246 Raw materials 12,625 10,910 Supplies and other 7,012 7,083 Inventories, net $ 27,111 $ 25,239

Property, Plant and Equipment,

Property, Plant and Equipment, Net	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	PROPERTY, PLANT AND EQUIPMENT, NET Table 5: Details of Property, Plant and Equipment, Net June 30, 2017 December 31, 2016 (in thousands) Land $ 13,186 $ 12,925 Buildings 112,971 112,583 Plant machinery 281,516 275,010 Mobile equipment 10,552 6,721 Construction in progress 10,136 15,016 Property, plant and equipment, at cost 428,361 422,255 Accumulated depreciation (130,430 ) (114,417 ) Property, plant and equipment, net $ 297,931 $ 307,838 Depreciation expense was $9.4 million and $17.5 million for the three and six months ended June 30, 2017 , respectively, compared to $8.3 million and $16.7 million for the three and six months ended June 30, 2016 , respectively.

Customer Relationships and Othe

Customer Relationships and Other Intangibles, Net	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Customer Relationships and Other Intangibles, Net	CUSTOMER RELATIONSHIPS AND OTHER INTANGIBLES, NET Table 6.1: Details of Customer Relationships and Other Intangibles, Net June 30, 2017 December 31, 2016 Gross Accumulated Amortization Net Gross Accumulated Amortization Net (in thousands) Customer relationships $ 116,488 $ (53,226 ) $ 63,262 $ 116,267 $ (48,243 ) $ 68,024 Purchased and internally developed software 5,453 (4,219 ) 1,234 5,322 (3,289 ) 2,033 Trademarks 14,811 (3,785 ) 11,026 14,783 (3,285 ) 11,498 Total $ 136,752 $ (61,230 ) $ 75,522 $ 136,372 $ (54,817 ) $ 81,555 Amortization expense was $3.1 million and $6.3 million for the three and six months ended June 30, 2017 , respectively, compared to $3.5 million and $7.1 million for the three and six months ended June 30, 2016 , respectively. Customer relationship assets are amortized over a 15 year period using an accelerated method that reflects the expected future cash flows from the acquired customer list intangible asset. Trademarks are amortized on a straight-line basis over the estimated useful life of 15 years. Software development costs are amortized over a 3 year life with the expense recorded in selling and administrative expense. Table 6.2: Future Amortization Expense of Customer Relationships and Other Intangibles As of June 30, 2017 (in thousands) July 1, 2017 through December 31, 2017 $ 5,765 2018 9,468 2019 8,398 2020 7,655 2021 7,042 Thereafter 37,194 Total $ 75,522

Investment in Seven Hills

Investment in Seven Hills	6 Months Ended
	Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investment in Seven Hills	INVESTMENT IN SEVEN HILLS The Company is a party with an unaffiliated third party to a paperboard liner venture named Seven Hills Paperboard, LLC ("Seven Hills") that provides the Company with a continuous supply of high-quality recycled paperboard liner to meet its ongoing production requirements. The Company has evaluated the characteristics of its investment and determined that Seven Hills would be deemed a variable interest entity, but that it does not have the power to direct the principal activities most impacting the economic performance of Seven Hills, and is thus not the primary beneficiary. As such, the Company accounts for this investment in Seven Hills under the equity method of accounting. Paperboard liner purchased from Seven Hills was $14.8 million and $26.8 million for the three and six months ended June 30, 2017 , respectively, compared to $11.1 million and $22.9 million for the three and six months ended June 30, 2016 , respectively. As of June 30, 2017 , the Company had certain purchase commitments for paper totaling $35.6 million through 2020 .

Accrued and Other Liabilities

Accrued and Other Liabilities	6 Months Ended
	Jun. 30, 2017
Payables and Accruals [Abstract]
Accrued and Other Liabilities	ACCRUED AND OTHER LIABILITIES Table 8: Details of Accrued and Other Liabilities June 30, 2017 December 31, 2016 (in thousands) Employee-related costs $ 4,830 $ 9,595 Income taxes 1,568 — Other taxes 3,013 2,088 Other 917 638 Accrued and other liabilities $ 10,328 $ 12,321

Debt

Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	DEBT Table 9.1: Details of Debt June 30, 2017 December 31, 2016 (in thousands) First Lien Credit Agreement (a) $ 272,257 $ 273,625 Less: Original issue discount (net of amortization) (1,810 ) (1,946 ) Less: Debt issuance costs (4,951 ) (5,317 ) Total debt 265,496 266,362 Less: Current portion of long-term debt (1,720 ) (1,742 ) Long-term debt $ 263,776 $ 264,620 (a) As of June 30, 2017, the Amended and Restated Credit Agreement, as amended, had a maturity date of August 18, 2023 and an interest rate of LIBOR (with a 0.75% floor) plus 2.50% , compared to as of December 31, 2016, at which time the First Lien Credit Agreement had the same maturity date and an interest rate of LIBOR (with a 0.75% floor) plus 2.75% . In connection with the Acquisition, the Company purchased certain assets from Lafarge N.A. with cash. In order to finance a portion of the consideration payable to Lafarge N.A., the Company and its subsidiary Continental Building Products Operating Company, LLC ("OpCo") entered into a first lien credit agreement with Credit Suisse AG, as administrative agent, Credit Suisse Securities (USA) LLC and RBC Capital Markets, as joint lead arrangers and joint bookrunners, and Royal Bank of Canada, as syndication agent (as amended on December 2, 2013, the "First Lien Credit Agreement") and a second lien credit agreement with Credit Suisse AG, as administrative agent, Credit Suisse Securities (USA) LLC and RBC Capital Markets, as joint lead arrangers and joint bookrunners, and Royal Bank of Canada, as syndication agent for term loan borrowings of $320 million and $120 million , respectively, and drew $25 million under a $50 million revolving credit facility under the First Lien Credit Agreement. The available amount under the First Lien Credit Agreement term loan was subsequently increased to $415 million . In conjunction with the initial issuance of this debt, the Company incurred $15.3 million of debt issuance costs which were being amortized using the effective interest rate method or the straight-line method which approximates the effective interest rate method, over the estimated life of the related debt. Interest under the First Lien Credit Agreement was floating. The margin applicable to the borrowing was reduced in the third quarter 2014 to 3.00% after the Company achieved a B2 rating with a stable outlook by Moody’s. On August 18, 2016, the Company, OpCo and Continental Building Products Canada Inc. and the lenders party thereto and Credit Suisse, as Administrative Agent, entered into an Amended and Restated Credit Agreement amending and restating the First Lien Credit Agreement (the "Amended and Restated Credit Agreement"). The Amended and Restated Credit Agreement provides for a $275 million senior secured first lien term loan facility and a $75 million senior secured revolving credit facility (the "Revolver"), which mature on August 18, 2023 and August 18, 2021, respectively. Related to this debt refinancing, the Company incurred $4.7 million of discount and debt issuance costs, of which $2.5 million was recorded in Other expense, net on the Consolidated Statements of Operations, and $2.2 million will be amortized over the term of the Amended and Restated Credit Agreement. Upon completion of this debt refinancing, the Company recognized an additional expense of $3.3 million related to losses resulting from debt extinguishment which is also reported in Other expense, net on the Consolidated Statements of Operations. The interest rate under the Amended and Restated Credit Agreement remained floating but was reduced to a spread over LIBOR of 2.75% and floor of 0.75% . On February 21, 2017 , the Company repriced its term loan under the Amended and Restated Credit Agreement lowering its interest rate by a further 25 basis points to LIBOR plus 2.50% thereby reducing its estimated interest expense by approximately $0.8 million per annum. All other terms and conditions under the Amended and Restated Credit Agreement remained the same. In connection with the debt repricing, the Company incurred $0.7 million of debt issuance costs, which was recorded in Other expense, net on the Consolidated Statements of Operations. The First Lien Credit Agreement was, and the Amended and Restated Credit Agreement is, secured by the underlying property and equipment of the Company. During the six months ended June 30, 2017 , the Company made no voluntary prepayment of principal, compared to $25.0 million of voluntary prepayments in the same period of 2016 . As of June 30, 2017 , the annual effective interest rate on the Amended and Restated Credit Agreement, including original issue discount and amortization of debt issuance costs, was 4.1% . There were no amounts outstanding under the Revolver as of June 30, 2017 or December 31, 2016 . During the six months ended June 30, 2017 the Company did not have any draws under the Revolver, compared to $22.0 million which the Company borrowed and repaid in full during the six months ended June 30, 2016 under the applicable revolving credit facility. Interest under the Revolver is floating, based on LIBOR plus 225 basis points. In addition, the Company pays a facility fee of 50 basis points per annum on the total capacity under the Revolver. Availability under the Revolver as of June 30, 2017 , based on draws and outstanding letters of credit and absence of violations of covenants, was $73.4 million . Table 9.2: Future Minimum Principal Payments Due Under the Amended and Restated Credit Agreements Amount Due (in thousands) July 1, 2017 through December 31, 2017 $ 1,368 2018 2,736 2019 2,736 2020 2,736 2021 2,736 Thereafter 259,945 Total Payments $ 272,257 Under the terms of the Amended and Restated Credit Agreement, the Company is required to comply with certain covenants, including among others, the limitation of indebtedness, limitation on liens, and limitations on certain cash distributions. One single financial covenant governs all of the Company’s debt and only applies if the outstanding borrowings of the Revolver plus outstanding letters of credit are greater than $22.5 million as of the end of the quarter. The financial covenant is a total leverage ratio calculation, in which total debt less outstanding cash is divided by adjusted earnings before interest, depreciation and amortization. As the sum of outstanding borrowings under the Revolver and outstanding letters of credit were less than $22.5 million at June 30, 2017 , the total leverage ratio of no greater than 5.0 under the financial covenant was not applicable at June 30, 2017 .

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS The Company uses derivative instruments to manage selected commodity price and interest rate exposures. The Company does not use derivative instruments for speculative trading purposes, and typically does not hedge beyond one year for commodity derivative instruments. Cash flows from derivative instruments are included in net cash provided by operating activities in the consolidated statements of cash flows. Commodity Derivative Instruments As of June 30, 2017 , the Company had 2,420 thousand millions of British Thermal Units ("mmBTUs") in aggregate notional amount outstanding natural gas swap contracts to manage commodity price exposures. All of these contracts mature by July 31, 2018 . The Company elected to designate these derivative instruments as cash flow hedges in accordance with FASB Accounting Standards Codification ("ASC") 815-20, Derivatives – Hedging . For derivative contracts designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is recorded to accumulated other comprehensive income, and is reclassified to earnings when the underlying forecasted transaction affects earnings. The ineffective portion of changes in the fair value of the derivative is recorded in cost of goods sold. The net unrealized loss that remained in accumulated other comprehensive loss as of June 30, 2017 was $0.1 million which is net of a tax amount of $0.1 million . The net unrealized gain that remained in accumulated other comprehensive loss as of December 31, 2016 was $0.2 million which is net of a tax amount of $0.1 million . No ineffectiveness was recorded on these contracts during the three and six months ended June 30, 2017 and 2016 . The Company reassesses the probability of the underlying forecasted transactions occurring on a quarterly basis. For the three and six months ended June 30, 2017 , approximately $0.3 million of loss, net of $0.1 million of tax and $0.3 million of loss, net of $0.2 million of tax, respectively, were recognized in other comprehensive income for the commodity contracts. For both the three and six months ended June 30, 2017 , the amount of gain reclassified from accumulated other comprehensive loss into income was $0.1 million . As of June 30, 2017 , there was $0.1 million recorded in other current assets and $0.2 million was recorded in other current liabilities. For the three and six months ended June 30, 2016 , approximately $0.3 million of gain, net of $0.2 million of tax expense, and $0.2 million of gain, net of $0.1 million of tax expense, respectively, were recognized in other comprehensive income for the commodity contracts. For the three and six months ended June 30, 2016 , the amount of loss reclassified from accumulated other comprehensive loss into income was $0.2 million and $0.4 million , respectively. As of December 31, 2016 , $0.4 million was recorded in other current assets. Interest Rate Derivative Instrument In September 2016, the Company entered into interest rate swap agreements for a combined notional amount of $100.0 million with a term of four years , which hedged the floating LIBOR on a portion of the term loan under the Amended and Restated Credit Agreement to an average fixed rate of 1.323% and LIBOR floor of 0.75% . The Company elected to designate these interest rate swaps as cash flow hedges for accounting purposes. The net unrealized gain that remained in accumulated other comprehensive loss as of June 30, 2017 was $1.0 million which is net of a tax amount of $0.5 million . The net unrealized gain that remained in accumulated other comprehensive loss as of December 31, 2016 was $1.2 million which is net of a tax amount of $0.6 million . For the three and six months ended June 30, 2017 , the amount of loss reclassified from accumulated other comprehensive loss into income was $44,000 and $0.1 million , respectively. For the three and six months ended June 30, 2017 , approximately $0.3 million of loss, net of tax expense of $0.2 million and $0.2 million of loss, net of tax expense of $0.1 million , respectively, were recognized in other comprehensive income for the interest rate swaps. As of June 30, 2017 , there was $1.5 million recorded in other current assets. No ineffectiveness was recorded on these contracts during the three and six months ended June 30, 2017 . Counterparty Risk The Company is exposed to credit losses in the event of nonperformance by the counterparties to the Company’s derivative instruments. As of June 30, 2017 , the Company’s derivatives were in a $1.3 million net asset position. All of the Company’s counterparties have investment grade credit ratings; accordingly, the Company anticipates that the counterparties will be able to fully satisfy their obligations under the contracts. The Company’s agreements outline the conditions upon which it or the counterparties are required to post collateral. As of June 30, 2017 , the Company had no collateral posted with its counterparties related to the derivatives.

Treasury Stock

Treasury Stock	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Treasury Stock	TREASURY STOCK On November 4, 2015 , the Company announced that the Board of Directors approved a new stock repurchase program authorizing the Company to repurchase up to $50 million of its common stock, at such times and prices as determined by management as market conditions warrant, through December 31, 2016 . Pursuant to this authorization, on March 18, 2016 , the Company repurchased 900,000 shares of its common stock from LSF8 in a private transaction at a price per share of $16.10 , or an aggregate of approximately $14.5 million , pursuant to a stock purchase agreement dated March 14, 2016 . The Company has also repurchased shares of its common stock in the open market under this authorization. On August 3, 2016 , the Company announced the Board of Directors had approved an expansion of its stock repurchase program by $50 million , increasing the aggregate authorization from up to $50 million to up to $100 million . The program was also extended from the end of 2016 to the end of 2017 . On February 21, 2017 , the Board of Directors further expanded the Company's share repurchase program up to a total of $200 million of its common stock and extended the expiration date to December 31, 2018 . All repurchased shares are held in treasury, reducing the number of shares of common stock outstanding and used in the Company’s earnings per share calculation. Table 11: Treasury Stock Activity June 30, 2017 June 30, 2016 Shares Amount (a) Average Share Price (a) Shares Amount (a) Average Share Price (a) (in thousands, except share data) For the Three Months Ended: Beginning Balance 4,716,778 $ 93,993 $ 19.93 3,446,208 $ 65,505 $ 19.01 Repurchases on open market 932,000 22,599 24.25 231,980 4,984 21.48 Ending Balance 5,648,778 $ 116,592 $ 20.64 3,678,188 $ 70,489 $ 19.16 For the Six Months Ended: Beginning Balance 4,499,655 $ 88,756 $ 19.73 2,395,049 $ 48,479 $ 20.24 Repurchases on open market 1,149,123 27,836 24.22 383,139 7,520 19.63 Repurchase from LSF8 in private transaction — — — 900,000 14,490 16.10 Ending Balance 5,648,778 $ 116,592 $ 20.64 3,678,188 $ 70,489 $ 19.16 (a) Includes commissions paid for repurchases on open market.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION Stock options, Restricted Stock Awards, Restricted Stock Units and Performance Restricted Stock Units On May 1, 2017 , the Company granted one employee 1,701 Restricted Share Units ("RSUs") that vest ratably over four years from the grant date. The market price on the date of grant was $24.30 . On May 1, 2017 , the Company also granted one employee 1,702 Performance Based RSUs ("PRSUs"). The PRSUs vest on December 31, 2019 , with the exact number of PRSUs vesting subject to the achievement of certain performance conditions through December 31, 2018 . The number of PRSUs earned will vary from 0% to 200% of the number of PRSUs awarded, depending on the Company’s performance relative to a cumulative two year EBITDA target for fiscal years 2017 and 2018. The market price on the date of grant was $24.30 . For the three and six months ended June 30, 2017 , the Company recognized share-based compensation expenses of $0.8 million and $1.5 million , respectively, compared to $0.8 million and $1.2 million for the three and six months ended June 30, 2016 , respectively. The expenses related to share-based compensation awards were recorded in selling and administrative expenses. As of June 30, 2017 , there was $5.8 million of total unrecognized compensation cost related to non-vested stock options, restricted stock awards, RSUs and PRSUs. This cost is expected to be recognized over a weighted-average period of 2.5 years .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS Table 13: Changes in Accumulated Other Comprehensive Loss by Category Foreign currency translation adjustment Net unrealized gain on derivatives, net of tax Total (in thousands) Balance as of December 31, 2016 $ (4,778 ) $ 1,369 $ (3,409 ) Other comprehensive income/(loss) before reclassifications 564 (793 ) (229 ) Amounts reclassified from AOCI — 215 215 Net current period other comprehensive income/(loss) 564 (578 ) (14 ) Balance as of June 30, 2017 $ (4,214 ) $ 791 $ (3,423 )

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company’s annual estimated effective tax rate is approximately 33.43% . The Company is subject to audit examinations at federal, state and local levels by tax authorities in those jurisdictions. In addition, the Canadian operations are subject to audit examinations at federal and provincial levels by tax authorities in those jurisdictions. The tax matters challenged by the tax authorities are typically complex; therefore, the ultimate outcome of any challenges would be subject to uncertainty. The Company has not identified any issues that did not meet the recognition threshold or would be impacted by the measurement provisions of the uncertain tax position guidance.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table shows the weighted average number of shares used in computing earnings per share and the effect on the weighted average number of shares of potentially dilutive securities. Potentially dilutive common stock has no effect on income available to common stockholders. For the three and six months ended June 30, 2017 , approximately, 1,000 and 43,000 share-based compensation awards, respectively, were excluded from the weighted average shares outstanding because their impact would be anti-dilutive in the computation of dilutive earnings per share. Awards excluded for the same periods in 2016 were 165 and 77,000 , respectively. Table 15: Basic and Dilutive Earnings Per Share For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (dollars in thousands, except for per share amounts) Net income $ 12,398 $ 12,722 $ 24,625 $ 25,223 Weighted average number of shares outstanding - basic 39,125,571 40,670,650 39,349,674 41,097,472 Effect of dilutive securities: Restricted stock awards 5,880 7,449 7,971 7,236 Restricted stock units 39,988 25,095 57,169 15,789 Performance restricted stock units 17,837 — 17,180 — Stock options 20,943 13,968 22,934 7,969 Total effect of dilutive securities 84,648 46,512 105,254 30,994 Weighted average number of shares outstanding - diluted 39,210,219 40,717,162 39,454,928 41,128,466 Basic earnings per share $ 0.32 $ 0.31 $ 0.63 $ 0.61 Diluted earnings per share $ 0.32 $ 0.31 $ 0.62 $ 0.61

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Commitments The Company leases certain buildings and equipment. The Company’s facility and equipment leases may provide for escalations of rent or rent abatements and payment of pro rata portions of building operating expenses. Minimum lease payments are recognized on a straight-line basis over the minimum lease term. The total expenses under operating leases for the three and six months ended June 30, 2017 was $0.9 million and $1.7 million , respectively, compared to $1.1 million and $2.1 million for the same periods in 2016 , respectively. The Company also has non-capital purchase commitments that primarily relate to gas, gypsum, paper and other raw materials. The total amounts purchased under such commitments were $21.7 million and $42.8 million for the three and six months ended June 30, 2017 , respectively, compared to $15.5 million and $33.1 million for the three and six months ended June 30, 2016 , respectively. Table 16: Future Minimum Lease Payments Due Under Noncancellable Operating Leases and Purchase Commitments Future Minimum Lease Payments Purchase Commitments (in thousands) July 1, 2017 through December 31, 2017 $ 556 $ 22,857 2018 616 26,979 2019 1,494 26,718 2020 — 17,442 2021 — 5,237 Thereafter — 64,256 Total $ 2,666 $ 163,489 Contingent obligations Under certain circumstances, the Company provides letters of credit related to its natural gas and other supply purchases. As of June 30, 2017 and December 31, 2016 , the Company had outstanding letters of credit of approximately $1.6 million and $2.1 million , respectively. Legal Matters In the ordinary course of business, the Company executes contracts involving indemnifications standard in the industry. These indemnifications might include claims relating to any of the following: environmental and tax matters; intellectual property rights; governmental regulations and employment-related matters; customer, supplier, and other commercial contractual relationships; and financial matters. While the maximum amount to which the Company may be exposed under such agreements cannot be estimated, it is the opinion of management that these guarantees and indemnifications are not expected to have a material adverse effect on the Company’s financial condition, results of operations or liquidity. In the ordinary course of business, the Company is involved in certain legal actions and claims, including proceedings under laws and regulations relating to environmental and other matters. Because such matters are subject to many uncertainties and the outcomes are not predictable with assurance, the total liability for these legal actions and claims cannot be determined with certainty. When the Company determines that it is probable that a liability for environmental matters, legal actions or other contingencies has been incurred and the amount of the loss is reasonably estimable, an estimate of the costs to be incurred is recorded as a liability in the financial statements. As of June 30, 2017 and December 31, 2016 , such liabilities were not expected to have a material adverse effect on the Company’s financial condition, results of operations or liquidity. While management believes its accruals for such liabilities are adequate, the Company may incur costs in excess of the amounts provided. Although the ultimate amount of liability that may result from these matters or actions is not ascertainable, any amounts exceeding the recorded accruals are not expected to have a material adverse effect on the Company’s financial condition, results of operations or liquidity.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	SEGMENT REPORTING Segment information is presented in accordance with ASC 280, Segment Reporting, which establishes standards for reporting information about operating segments. It also establishes standards for related disclosures about products and geographic areas. The Company’s primary reportable segment is wallboard, which represented approximately 97.2% and 96.9% of the Company's revenues for the three and six months ended June 30, 2017 , respectively, compared to 97.0% and 96.8% of the Company's revenues for the three and six months ended June 30, 2016 , respectively. This segment produces wallboard for the commercial and residential construction sectors. The Company also manufactures finishing products, which complement the Company’s full range of wallboard products. Revenues from the major products sold to external customers include gypsum wallboard and finishing products. The Company’s two geographic areas consist of the United States and Canada for which it reports net sales, fixed assets and total assets. The Company evaluates operating performance based on profit or loss from operations before certain adjustments as shown below. Revenues are attributed to geographic areas based on the location of the assets producing the revenues. The Company did not provide asset information by segment as its Chief Operating Decision Maker does not use such information for purposes of allocating resources and assessing segment performance. Table 17.1: Segment Reporting For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (in thousands) Net Sales: Wallboard $ 117,194 $ 113,593 $ 233,670 $ 221,192 Other 3,436 3,522 7,575 7,408 Total net sales $ 120,630 $ 117,115 $ 241,245 $ 228,600 Operating income: Wallboard $ 21,819 $ 23,216 $ 43,411 $ 45,620 Other (199 ) (8 ) (104 ) 158 Total operating income $ 21,620 $ 23,208 $ 43,307 $ 45,778 Adjustments: Interest expense $ (3,062 ) $ (3,648 ) $ (5,978 ) $ (7,346 ) Income/(losses) from equity investment 345 (240 ) 175 (435 ) Other (expense)/income, net (135 ) 6 (779 ) 160 Income before provision for income taxes $ 18,768 $ 19,326 $ 36,725 $ 38,157 Depreciation and Amortization: Wallboard $ 12,177 $ 11,566 $ 23,199 $ 23,240 Other 297 276 561 548 Total depreciation and amortization $ 12,474 $ 11,842 $ 23,760 $ 23,788 Table 17.2: Net Sales By Geographic Region For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (in thousands) United States $ 113,665 $ 107,694 $ 224,051 $ 211,336 Canada 6,965 9,421 17,194 17,264 Net sales $ 120,630 $ 117,115 $ 241,245 $ 228,600 Table 17.3: Assets By Geographic Region Fixed Assets Total Assets June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 (in thousands) United States $ 294,561 $ 304,807 $ 610,355 $ 617,050 Canada 3,370 3,031 18,470 17,699 Total $ 297,931 $ 307,838 $ 628,825 $ 634,749

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Disclosures	FAIR VALUE DISCLOSURES U.S. GAAP provides a framework for measuring fair value, establishes a fair value hierarchy of the valuation techniques used to measure the fair value and requires certain disclosures relating to fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants in a market with sufficient activity. The three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value, is as follows: • Level 1—Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities that a Company has the ability to access; • Level 2—Inputs, other than the quoted market prices included in Level 1, which are observable for the asset or liability, either directly or indirectly; and • Level 3—Unobservable inputs for the asset or liability which is typically based on an entity’s own assumptions when there is little, if any, related market data available. The Company evaluates assets and liabilities subject to fair value measurements on a recurring and non-recurring basis to determine the appropriate level to classify them for each reporting period. This determination requires significant judgments to be made by the Company. The fair values of receivables, accounts payable, accrued costs and other current liabilities approximate the carrying values as a result of the short-term nature of these instruments. The Company estimates the fair value of its debt by discounting the future cash flows of each instrument using estimated market rates of debt instruments with similar maturities and credit profiles. These inputs are classified as Level 3 within the fair value hierarchy. As of June 30, 2017 and December 31, 2016 , the carrying value reported in the consolidated balance sheet for the Company’s notes payable approximated its fair value. The only assets or liabilities the Company had at June 30, 2017 that are recorded at fair value on a recurring basis are the natural gas hedges and interest rate swaps. The natural gas hedges had a negative fair value of $0.1 million as of June 30, 2017 , net of tax amount of $0.1 million , compared to a positive fair value of 0.2 million , net of tax amount of $0.1 million as of December 31, 2016 . Interest rate swaps had a positive fair value of $1.0 million as of June 30, 2017 , net of tax amount of $0.5 million , compared to a positive fair value of $1.2 million as of December 31, 2016 , net of tax amount of $0.6 million . Both the natural gas hedges and interest rate swaps are classified within Level 2 of the fair value hierarchy as they are valued using third party pricing models which contain inputs that are derived from observable market data. Generally, the Company obtains its Level 2 pricing inputs from its counterparties. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Assets and liabilities that are measured at fair value on a non-recurring basis include intangible assets and goodwill. These items are recognized at fair value when they are considered to be impaired. There were no fair value adjustments for assets and liabilities measured on a non-recurring basis. The Company discloses fair value information about financial instruments for which it is practicable to estimate that value.

Significant Accounting Polici25

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements for the Company have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions have been eliminated.
Recent Accounting Pronouncements	Accounting Standards Adopted During the Period In July 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-11, "Inventory: Simplifying the Measurement of Inventory." This guidance applies to inventory valued at first-in, first-out (FIFO) or average cost and requires inventory to be measured at the lower of cost and net realizable value, rather than at the lower of cost or market. ASU 2015-11 is effective on a prospective basis for annual periods, including interim reporting periods within those periods, beginning after December 15, 2016. The Company values its inventory under the average cost method and thus will be required to adopt the standard. The Company adopted the new standard in the first quarter of 2017. The adoption of this standard did not have a material impact on the Company's Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting," which introduces targeted amendments intended to simplify the accounting for stock compensation. Specifically, the ASU requires all excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) to be recognized as income tax expense or benefit in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits, and assess the need for a valuation allowance, regardless of whether the benefit reduces taxes payable in the current period. That is, off-balance sheet accounting for net operating losses stemming from excess tax benefits would no longer be required and instead such net operating losses would be recognized when they arise. Existing net operating losses that are currently tracked off-balance sheet would be recognized, net of a valuation allowance if required, through an adjustment to opening retained earnings in the period of adoption. Entities will no longer need to maintain and track an "APIC pool." The ASU also requires excess tax benefits to be classified along with other income tax cash flows as an operating activity in the statement of cash flows. The amendments were effective for annual periods beginning after December 15, 2016. The Company adopted the new standard in the first quarter of 2017, which resulted in a favorable adjustment to income tax provision of $0.2 million . Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-9, "Revenue from Contracts with Customers (Topic 606)," which provides accounting guidance for all revenue arising from contracts with customers and affects all entities that enter into contracts to provide goods or services to their customers. In August 2015, the FASB issued ASU No. 2015-14, "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date," which defers the effective date of ASU No. 2014-9 for all entities by one year to annual reporting periods beginning after December 15, 2017. The ASU requires retroactive application on either a full or modified basis. The Company will adopt the standard on January 1, 2018. The Company has identified a project implementation team and has identified its revenue streams. The Company is in the process of evaluating the various aspects of the standard and how the standard may impact how the Company recognizes revenue. The Company is also evaluating the potential impact that the new guidance will have on its Consolidated Financial Statements. While the Company has not completed its analysis, the Company does not anticipate that the new guidance will have a material impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, "Leases." ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is in the process of evaluating the impact of adoption, which is not expected to have a material impact on the Company's Consolidated Financial Statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments." This ASU is intended to introduce a revised approach to the recognition and measurement of credit losses, emphasizing an updated model based on expected losses rather than incurred losses. The provisions of this standard are effective for reporting periods beginning after December 15, 2019 and early adoption is permitted. The Company is currently evaluating the impact that this guidance may have on its Consolidated Financial Statements. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments." This ASU intends to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements. In October 2016, the FASB issued ASU 2016-16, "Intra-Entity Transfers of Assets Other Than Inventory." The new standard requires companies to recognize the income tax effects of intercompany sales or transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period the sales or transfer occurs. The standard requires companies to apply a modified retrospective approach with a cumulative catch-up adjustment to opening retained earnings in the period of adoption. The provisions of this standard are effective for fiscal years beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017- 04, "Intangibles - Goodwill and Other." This ASU simplifies the goodwill impairment calculation by eliminating the requirement to calculate the implied fair value of goodwill (i.e., Step 2 of today’s goodwill impairment test) to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., Step 1 of today’s goodwill impairment test). The standard will be applied prospectively and is effective for annual and interim impairment tests performed in periods beginning after December 15, 2019. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating when it will adopt the ASU and the expected impact to its Consolidated Financial Statements.

Significant Accounting Polici26

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Supplemental Cash Flow Disclosure Table 2.1: Certain Cash and Non-Cash Transactions For the Six Months Ended June 30, 2017 June 30, 2016 (in thousands) Cash paid during the period for: Interest paid on term loan $ 4,973 $ 5,876 Income taxes paid, net 10,259 12,160 Non-cash activity: Amounts in accounts payable for capital expenditures 1,899 547

Receivables, Net (Tables)

Receivables, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Detail of Receivables, Net	Table 3: Details of Receivables, Net June 30, 2017 December 31, 2016 (in thousands) Trade receivables, gross $ 38,169 $ 33,199 Allowance for cash discounts and doubtful accounts (758 ) (726 ) Receivables, net $ 37,411 $ 32,473

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Composition of Inventories	Table 4: Details of Inventories, Net June 30, 2017 December 31, 2016 (in thousands) Finished products $ 7,474 $ 7,246 Raw materials 12,625 10,910 Supplies and other 7,012 7,083 Inventories, net $ 27,111 $ 25,239

Property, Plant and Equipment29

Property, Plant and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Details	Table 5: Details of Property, Plant and Equipment, Net June 30, 2017 December 31, 2016 (in thousands) Land $ 13,186 $ 12,925 Buildings 112,971 112,583 Plant machinery 281,516 275,010 Mobile equipment 10,552 6,721 Construction in progress 10,136 15,016 Property, plant and equipment, at cost 428,361 422,255 Accumulated depreciation (130,430 ) (114,417 ) Property, plant and equipment, net $ 297,931 $ 307,838

Customer Relationships and Ot30

Customer Relationships and Other Intangibles, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Details of Customer Relationships and Other Intangibles, Net	Table 6.1: Details of Customer Relationships and Other Intangibles, Net June 30, 2017 December 31, 2016 Gross Accumulated Amortization Net Gross Accumulated Amortization Net (in thousands) Customer relationships $ 116,488 $ (53,226 ) $ 63,262 $ 116,267 $ (48,243 ) $ 68,024 Purchased and internally developed software 5,453 (4,219 ) 1,234 5,322 (3,289 ) 2,033 Trademarks 14,811 (3,785 ) 11,026 14,783 (3,285 ) 11,498 Total $ 136,752 $ (61,230 ) $ 75,522 $ 136,372 $ (54,817 ) $ 81,555
Future Amortization Expense of Customer Relationships and Other Intangibles	Table 6.2: Future Amortization Expense of Customer Relationships and Other Intangibles As of June 30, 2017 (in thousands) July 1, 2017 through December 31, 2017 $ 5,765 2018 9,468 2019 8,398 2020 7,655 2021 7,042 Thereafter 37,194 Total $ 75,522

Accrued and Other Liabilities (

Accrued and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Payables and Accruals [Abstract]
Details of Accrued and Other Liabilities	Table 8: Details of Accrued and Other Liabilities June 30, 2017 December 31, 2016 (in thousands) Employee-related costs $ 4,830 $ 9,595 Income taxes 1,568 — Other taxes 3,013 2,088 Other 917 638 Accrued and other liabilities $ 10,328 $ 12,321

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Details of Debt	Table 9.1: Details of Debt June 30, 2017 December 31, 2016 (in thousands) First Lien Credit Agreement (a) $ 272,257 $ 273,625 Less: Original issue discount (net of amortization) (1,810 ) (1,946 ) Less: Debt issuance costs (4,951 ) (5,317 ) Total debt 265,496 266,362 Less: Current portion of long-term debt (1,720 ) (1,742 ) Long-term debt $ 263,776 $ 264,620
Future Minimum Principal Payments Due Under the Credit Agreements	Table 9.2: Future Minimum Principal Payments Due Under the Amended and Restated Credit Agreements Amount Due (in thousands) July 1, 2017 through December 31, 2017 $ 1,368 2018 2,736 2019 2,736 2020 2,736 2021 2,736 Thereafter 259,945 Total Payments $ 272,257

Treasury Stock (Tables)

Treasury Stock (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Treasury Stock Activity	All repurchased shares are held in treasury, reducing the number of shares of common stock outstanding and used in the Company’s earnings per share calculation. Table 11: Treasury Stock Activity June 30, 2017 June 30, 2016 Shares Amount (a) Average Share Price (a) Shares Amount (a) Average Share Price (a) (in thousands, except share data) For the Three Months Ended: Beginning Balance 4,716,778 $ 93,993 $ 19.93 3,446,208 $ 65,505 $ 19.01 Repurchases on open market 932,000 22,599 24.25 231,980 4,984 21.48 Ending Balance 5,648,778 $ 116,592 $ 20.64 3,678,188 $ 70,489 $ 19.16 For the Six Months Ended: Beginning Balance 4,499,655 $ 88,756 $ 19.73 2,395,049 $ 48,479 $ 20.24 Repurchases on open market 1,149,123 27,836 24.22 383,139 7,520 19.63 Repurchase from LSF8 in private transaction — — — 900,000 14,490 16.10 Ending Balance 5,648,778 $ 116,592 $ 20.64 3,678,188 $ 70,489 $ 19.16 (a) Includes commissions paid for repurchases on open market.

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Changes in Accumulated Other Comprehensive (Loss)/Income by Category	Table 13: Changes in Accumulated Other Comprehensive Loss by Category Foreign currency translation adjustment Net unrealized gain on derivatives, net of tax Total (in thousands) Balance as of December 31, 2016 $ (4,778 ) $ 1,369 $ (3,409 ) Other comprehensive income/(loss) before reclassifications 564 (793 ) (229 ) Amounts reclassified from AOCI — 215 215 Net current period other comprehensive income/(loss) 564 (578 ) (14 ) Balance as of June 30, 2017 $ (4,214 ) $ 791 $ (3,423 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Basic and Dilutive Earnings Per Share	The following table shows the weighted average number of shares used in computing earnings per share and the effect on the weighted average number of shares of potentially dilutive securities. Potentially dilutive common stock has no effect on income available to common stockholders. For the three and six months ended June 30, 2017 , approximately, 1,000 and 43,000 share-based compensation awards, respectively, were excluded from the weighted average shares outstanding because their impact would be anti-dilutive in the computation of dilutive earnings per share. Awards excluded for the same periods in 2016 were 165 and 77,000 , respectively. Table 15: Basic and Dilutive Earnings Per Share For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (dollars in thousands, except for per share amounts) Net income $ 12,398 $ 12,722 $ 24,625 $ 25,223 Weighted average number of shares outstanding - basic 39,125,571 40,670,650 39,349,674 41,097,472 Effect of dilutive securities: Restricted stock awards 5,880 7,449 7,971 7,236 Restricted stock units 39,988 25,095 57,169 15,789 Performance restricted stock units 17,837 — 17,180 — Stock options 20,943 13,968 22,934 7,969 Total effect of dilutive securities 84,648 46,512 105,254 30,994 Weighted average number of shares outstanding - diluted 39,210,219 40,717,162 39,454,928 41,128,466 Basic earnings per share $ 0.32 $ 0.31 $ 0.63 $ 0.61 Diluted earnings per share $ 0.32 $ 0.31 $ 0.62 $ 0.61

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases and Purchase Commitments by Year	Table 16: Future Minimum Lease Payments Due Under Noncancellable Operating Leases and Purchase Commitments Future Minimum Lease Payments Purchase Commitments (in thousands) July 1, 2017 through December 31, 2017 $ 556 $ 22,857 2018 616 26,979 2019 1,494 26,718 2020 — 17,442 2021 — 5,237 Thereafter — 64,256 Total $ 2,666 $ 163,489

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	Table 17.1: Segment Reporting For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (in thousands) Net Sales: Wallboard $ 117,194 $ 113,593 $ 233,670 $ 221,192 Other 3,436 3,522 7,575 7,408 Total net sales $ 120,630 $ 117,115 $ 241,245 $ 228,600 Operating income: Wallboard $ 21,819 $ 23,216 $ 43,411 $ 45,620 Other (199 ) (8 ) (104 ) 158 Total operating income $ 21,620 $ 23,208 $ 43,307 $ 45,778 Adjustments: Interest expense $ (3,062 ) $ (3,648 ) $ (5,978 ) $ (7,346 ) Income/(losses) from equity investment 345 (240 ) 175 (435 ) Other (expense)/income, net (135 ) 6 (779 ) 160 Income before provision for income taxes $ 18,768 $ 19,326 $ 36,725 $ 38,157 Depreciation and Amortization: Wallboard $ 12,177 $ 11,566 $ 23,199 $ 23,240 Other 297 276 561 548 Total depreciation and amortization $ 12,474 $ 11,842 $ 23,760 $ 23,788
Net Sales By Geographic Region	Table 17.2: Net Sales By Geographic Region For the Three Months Ended For the Six Months Ended June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 (in thousands) United States $ 113,665 $ 107,694 $ 224,051 $ 211,336 Canada 6,965 9,421 17,194 17,264 Net sales $ 120,630 $ 117,115 $ 241,245 $ 228,600
Assets By Geographic Region	Table 17.3: Assets By Geographic Region Fixed Assets Total Assets June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 (in thousands) United States $ 294,561 $ 304,807 $ 610,355 $ 617,050 Canada 3,370 3,031 18,470 17,699 Total $ 297,931 $ 307,838 $ 628,825 $ 634,749

Background and Nature of Oper38

Background and Nature of Operations - Description of Business and Acquisition (Detail) $ in Millions	Aug. 30, 2013USD ($)	Jun. 30, 2017facility
Lone Star Fund VIII (U.S.), L.P. | Lafarge N.A.
Business Acquisition [Line Items]
Total purchase price | $	$ 703
Wallboard
Business Acquisition [Line Items]
Number of operating facilities (facility)		3
Joint Compound
Business Acquisition [Line Items]
Number of operating facilities (facility)		1

Background and Nature of Oper39

Background and Nature of Operations - Public Offerings (Detail) - $ / shares	Mar. 18, 2016	Jun. 30, 2017	Jun. 30, 2016
Repurchase from LSF8 in private transaction
Subsidiary, Sale of Stock [Line Items]
Shares repurchased (shares)	900,000	0	900,000
Secondary Public Offerings | LSF8 Gypsum Holdings, L.P.
Subsidiary, Sale of Stock [Line Items]
Shares issued at public offering (shares)	5,106,803
Offering price per share (usd per share)	$ 16.10
Secondary Public Offerings | LSF8 Gypsum Holdings, L.P. | Repurchase from LSF8 in private transaction
Subsidiary, Sale of Stock [Line Items]
Shares repurchased (shares)	900,000

- Certain Cash and Non-Cash Tra

- Certain Cash and Non-Cash Transactions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Interest paid	$ 4,973	$ 5,876
Income taxes paid, net	10,259	12,160
Accounts payable for capital expenditures	$ 1,899	$ 547

Significant Accounting Polici41

Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Accounting Policies [Abstract]
Favorable adjustment to income tax provision	$ 0.2

Receivables, Net - Detail of Re

Receivables, Net - Detail of Receivables, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade receivables, gross	$ 38,169	$ 33,199
Allowance for cash discounts and doubtful accounts	(758)	(726)
Receivables, net	$ 37,411	$ 32,473

Inventories (Detail)

Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished products	$ 7,474	$ 7,246
Raw materials	12,625	10,910
Supplies and other	7,012	7,083
Inventories, net	$ 27,111	$ 25,239

Property, Plant and Equipment44

Property, Plant and Equipment, Net - Property, Plant and Equipment Details (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 428,361	$ 422,255
Accumulated depreciation	(130,430)	(114,417)
Property, plant and equipment, net	297,931	307,838
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	13,186	12,925
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	112,971	112,583
Plant machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	281,516	275,010
Mobile equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	10,552	6,721
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 10,136	$ 15,016

Property, Plant and Equipment45

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 9.4	$ 8.3	$ 17.5	$ 16.7

Investment in Seven Hills - Add

Investment in Seven Hills - Additional Information (Detail) - Seven Hills - Variable Interest Entity, Not Primary Beneficiary - Equity Method Investee - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Cost of paperboard	$ 14.8	$ 11.1	$ 26.8	$ 22.9
Purchase commitments			$ 35.6

Customer Relationships and Ot47

Customer Relationships and Other Intangibles, Net - Details of Customer Relationships and Other Intangibles, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross	$ 136,752	$ 136,372
Accumulated Amortization	(61,230)	(54,817)
Net	75,522	81,555
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	116,488	116,267
Accumulated Amortization	(53,226)	(48,243)
Net	63,262	68,024
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	5,453	5,322
Accumulated Amortization	(4,219)	(3,289)
Net	1,234	2,033
Purchased and internally developed software
Finite-Lived Intangible Assets [Line Items]
Gross	14,811	14,783
Accumulated Amortization	(3,785)	(3,285)
Net	$ 11,026	$ 11,498

Customer Relationships and Ot48

Customer Relationships and Other Intangibles, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 3.1	$ 3.5	$ 6.3	$ 7.1
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			15 years
Purchased and internally developed software
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			15 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			3 years

Customer Relationships and Ot49

Customer Relationships and Other Intangibles, Net - Future Amortization Expense of Customer Relationships and Other Intangibles (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
July 1, 2017 through December 31, 2017	$ 5,765
2,018	9,468
2,019	8,398
2,020	7,655
2,021	7,042
Thereafter	37,194
Net	$ 75,522	$ 81,555

Accrued and Other Liabilities50

Accrued and Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Employee-related costs	$ 4,830	$ 9,595
Income taxes	1,568	0
Other taxes	3,013	2,088
Other	917	638
Accrued and other liabilities	$ 10,328	$ 12,321

Debt - Details of Debt (Detail)

Debt - Details of Debt (Detail) - USD ($) $ in Thousands	Aug. 18, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
First Lien Credit Agreement (a)		$ 272,257
Less: Original issue discount (net of amortization)		(1,810)		$ (1,946)
Less: Debt issuance costs		(4,951)		(5,317)
Total debt		265,496		266,362
Less: Current portion of long-term debt		(1,720)		(1,742)
Long-term debt		263,776		264,620
Term Loan Facility | First Lien Credit Agreement
Debt Instrument [Line Items]
First Lien Credit Agreement (a)		$ 272,257		$ 273,625
Term Loan Facility | First Lien Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floor rate	0.75%	0.75%		0.75%
Debt, variable interest rate (as a percent)	2.75%	2.50%	2.75%

Debt - Additional Information (

Debt - Additional Information (Detail)	Feb. 21, 2017USD ($)	Aug. 18, 2016USD ($)	Aug. 30, 2013USD ($)	May 31, 2014	Sep. 30, 2014	Jun. 30, 2017USD ($)covenant	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Dec. 02, 2013USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment						$ 686,000	$ 0
Pre payment of principal for the first lien credit agreement						$ 1,368,000	25,000,000
First Lien Credit Agreement
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 3,300,000
Number of covenants | covenant						1
Debt covenant trigger, line of credit facility amount less letters of credit threshold						$ 22,500,000
First Lien Credit Agreement | Maximum
Debt Instrument [Line Items]
Leverage ratio (no greater than)						5
Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Debt issuance cost	$ 700,000
Decrease in basis spread, percentage	0.25%
Estimated annual interest expense reduction	$ 800,000
Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)	2.50%
Term Loan Facility | First Lien Credit Agreement
Debt Instrument [Line Items]
Debt principal amount		275,000,000	$ 320,000,000						$ 415,000,000
Debt issuance cost			15,300,000
Discount and debt issuance costs		4,700,000				$ 2,200,000
Discount and debt issuance costs recorded in other expense, net		$ 2,500,000
Pre payment of principal for the first lien credit agreement							$ 25,000,000
Effective interest rate						4.10%
Term Loan Facility | First Lien Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)		2.75%				2.50%	2.75%
Floor rate		0.75%				0.75%		0.75%
Decrease in basis spread, percentage				0.50%
Term Loan Facility | First Lien Credit Agreement | Moody's, B2 Rating
Debt Instrument [Line Items]
Effective interest rate					3.00%
Term Loan Facility | First Lien Credit Agreement | Moody's, B2 Rating | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Decrease in basis spread, percentage					0.25%
Term Loan Facility | Second Lien Credit Agreement
Debt Instrument [Line Items]
Debt principal amount			120,000,000
Line of Credit | First Lien Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from line of credit			25,000,000			$ 22,000,000	$ 10,000,000
Line of credit facility borrowing capacity		$ 75,000,000	$ 50,000,000
Outstanding amount						$ 0		$ 0
Repayment amount							$ 22,000,000
Facility fee, basis points						0.50%
Remaining outstanding						$ 73,400,000
Line of Credit | First Lien Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)						2.25%

Debt - Future Minimum Principal

Debt - Future Minimum Principal Payments Due Under the Credit Agreements (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1, 2017 through December 31, 2017	$ 1,368
2,019	2,736
2,018	2,736
2,020	2,736
2,021	2,736
Thereafter	259,945
Total Payments	$ 272,257

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2016MMBTU	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)MMBTU	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Derivative [Line Items]
Net unrealized gain (loss) that remained in accumulated other comprehensive loss		$ 307,488,000		$ 307,488,000		$ 309,012,000
Derivatives, net liability position		1,300,000		1,300,000
Collateral posted with counterparties related to derivatives		0		0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Net unrealized gain (loss) that remained in accumulated other comprehensive loss		791,000		$ 791,000		1,369,000
Natural Gas Swap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Aggregate notional amount outstanding (in mmBTUs) | MMBTU				2,420,000
Gain (loss) on derivatives qualifying as cash flow hedges, net of tax		(300,000)	$ 300,000	$ (300,000)	$ 200,000
Income tax expense (benefit) recognized in other comprehensive income		(100,000)	200,000	(200,000)	100,000
Gain (loss) reclassified from accumulated other comprehensive income, before tax		100,000	$ 200,000	100,000	$ 400,000
Natural Gas Swap | Cash Flow Hedging | Designated as Hedging Instrument | Accrued and Other Liabilities
Derivative [Line Items]
Amount recorded in other current liabilities		(237,000)		(237,000)
Natural Gas Swap | Cash Flow Hedging | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Amount recorded in other current assets		100,000		100,000		400,000
Natural Gas Swap | Cash Flow Hedging | Designated as Hedging Instrument | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Net unrealized gain (loss) that remained in accumulated other comprehensive loss		(100,000)		(100,000)		200,000
Net unrealized gain (loss) that remained in accumulated other comprehensive loss, tax		(100,000)		(100,000)		100,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Derivative instrument term (not beyond)	4 years
Aggregate notional amount outstanding (in mmBTUs) | MMBTU	100,000,000
Gain (loss) on derivatives qualifying as cash flow hedges, net of tax		(300,000)		(200,000)
Income tax expense (benefit) recognized in other comprehensive income		168,000		117,000
Gain (loss) reclassified from accumulated other comprehensive income, before tax		$ (44,000)		$ (100,000)
Average fixed rate		1.323%		1.323%
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument | London Interbank Offered Rate (LIBOR)
Derivative [Line Items]
Floor rate		0.75%		0.75%
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets [Member]
Derivative [Line Items]
Amount recorded in other current assets		$ 1,500,000		$ 1,500,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Net unrealized gain (loss) that remained in accumulated other comprehensive loss		(1,000,000)		(1,000,000)		(1,200,000)
Net unrealized gain (loss) that remained in accumulated other comprehensive loss, tax		$ 500,000		$ 500,000		$ (600,000)
Maximum
Derivative [Line Items]
Derivative instrument term (not beyond)				1 year

Treasury Stock - Additional Inf

Treasury Stock - Additional Information (Detail) - USD ($)	Mar. 18, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Feb. 21, 2017	Aug. 03, 2016	Nov. 04, 2015
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program authorized amount (up to)								$ 200,000,000	$ 100,000,000	$ 50,000,000
Number of common stock shares repurchased, value per share (usd per share)		$ 19.93	$ 19.01	$ 20.64	$ 19.16	$ 19.73	$ 20.24
Stock repurchase program, increase in authorized amount									$ 50,000,000
Repurchase from LSF8 in private transaction
Equity, Class of Treasury Stock [Line Items]
Number of common stock shares repurchased (shares)	900,000			0	900,000
Number of common stock shares repurchased, value per share (usd per share)	$ 16.10			$ 0	$ 16.10
Aggregate value of common stock shares repurchased	$ 14,500,000			$ 0	$ 14,490,000

Treasury Stock - Treasury Stock

Treasury Stock - Treasury Stock Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 18, 2016	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Treasury Stock [Roll Forward]
Beginning balance (shares)		4,716,778	4,499,655	3,446,208	2,395,049	4,499,655	2,395,049	2,395,049
Beginning balance		$ 93,993	$ 88,756	$ 65,505	$ 48,479	$ 88,756	$ 48,479	$ 48,479
Ending balance (shares)		5,648,778	4,716,778	3,678,188	3,446,208	5,648,778	3,678,188	4,499,655	2,395,049
Ending balance		$ 116,592	$ 93,993	$ 70,489	$ 65,505	$ 116,592	$ 70,489	$ 88,756	$ 48,479
Average share price (usd per share)			$ 19.93		$ 19.01	$ 20.64	$ 19.16	$ 19.73	$ 20.24
Repurchases on open market
Treasury Stock [Roll Forward]
Shares repurchased (shares)		932,000		231,980		1,149,123	383,139
Shares repurchased		$ 22,599		$ 4,984		$ 27,836	$ 7,520
Average share price (usd per share)		$ 24.25		$ 21.48		$ 24.22	$ 19.63
Repurchase from LSF8 in private transaction
Treasury Stock [Roll Forward]
Shares repurchased (shares)	900,000					0	900,000
Shares repurchased	$ 14,500					$ 0	$ 14,490
Average share price (usd per share)	$ 16.10					$ 0	$ 16.10

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Mar. 21, 2017	Feb. 22, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 0.8	$ 0.8	$ 1.5	$ 1.2
Unrecognized compensation expense related to non-vested restricted stock			$ 5.8		$ 5.8
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation expense, weighted average remaining period					2 years 6 months
Performance restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares		1,702
Weighted average grant date fair value (in dollars per share)		$ 24.30
Performance restricted stock units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of PRSUs earned		0.00%
Performance restricted stock units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of PRSUs earned		200.00%
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)		$ 24.30
Restricted stock units | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares		1,701
Vesting period	4 years

Accumulated Other Comprehensi58

Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 309,012
Ending Balance	307,488
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(4,778)
Other comprehensive income/(loss) before reclassifications	564
Amounts reclassified from AOCI	0
Net current period other comprehensive income/(loss)	564
Ending Balance	(4,214)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,369
Other comprehensive income/(loss) before reclassifications	(793)
Amounts reclassified from AOCI	215
Net current period other comprehensive income/(loss)	(578)
Ending Balance	791
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,409)
Other comprehensive income/(loss) before reclassifications	(229)
Amounts reclassified from AOCI	215
Net current period other comprehensive income/(loss)	(14)
Ending Balance	$ (3,423)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective rate (as a percent)	33.40%

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,000	165	43,000	77,000
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 12,398	$ 12,722	$ 24,625	$ 25,223
Weighted average number of shares outstanding- basic (shares)	39,125,571	40,670,650	39,349,674	41,097,472
Effect of dilutive securities:
Total effect of dilutive securities (shares)	84,648	46,512	105,254	30,994
Weighted average number of shares outstanding - diluted (shares)	39,210,219	40,717,162	39,454,928	41,128,466
Basic earnings per share (usd per share)	$ 0.32	$ 0.31	$ 0.63	$ 0.61
Diluted earnings per share (usd per share)	$ 0.32	$ 0.31	$ 0.62	$ 0.61
Restricted stock awards
Effect of dilutive securities:
Effect of dilutive securities (shares)	5,880	7,449	7,971	7,236
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (shares)	39,988	25,095	57,169	15,789
Performance restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (shares)	17,837	0	17,180	0
Stock options
Effect of dilutive securities:
Effect of dilutive securities (shares)	20,943	13,968	22,934	7,969

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 0.9	$ 1.1	$ 1.7	$ 2.1
Letter of Credit
Long-term Purchase Commitment [Line Items]
Outstanding amount of letters of credit	1.6		1.6		$ 2.1
Gas, Gypsum, Paper, and Other Raw Materials
Long-term Purchase Commitment [Line Items]
Non capital purchased under commitments	$ 21.7	$ 15.5	$ 42.8	$ 33.1

Commitments and Contingencies62

Commitments and Contingencies - Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases and Purchase Commitments by Year (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Future Minimum Lease Payments
July 1, 2017 through December 31, 2017	$ 556
2,018	616
2,019	1,494
2,020	0
2,021	0
Thereafter	0
Total	2,666
Purchase Commitments
July 1, 2017 through December 31, 2017	22,857
2,018	26,979
2,019	26,718
2,020	17,442
2,021	5,237
Thereafter	64,256
Total	$ 163,489

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail) - geographic_area	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Number of geographical areas (geographic area)	2		2
Wallboard | Sales Revenue, Net [Member] | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	97.20%	97.00%	96.90%	96.80%

Segment Reporting - Segment Rep

Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Sales:
Net Sales	$ 120,630	$ 117,115	$ 241,245	$ 228,600
Operating income:
Operating income	21,620	23,208	43,307	45,778
Adjustments:
Interest expense	(3,062)	(3,648)	(5,978)	(7,346)
Income/(losses) from equity investment	345	(240)	175	(435)
Other (expense)/income, net	(135)	6	(779)	160
Income before provision for income taxes	18,768	19,326	36,725	38,157
Depreciation and Amortization
Total depreciation and amortization	12,474	11,842	23,760	23,788
Operating Segments | Wallboard
Net Sales:
Net Sales	117,194	113,593	233,670	221,192
Operating income:
Operating income	21,819	23,216	43,411	45,620
Depreciation and Amortization
Total depreciation and amortization	12,177	11,566	23,199	23,240
Operating Segments | Other
Net Sales:
Net Sales	3,436	3,522	7,575	7,408
Operating income:
Operating income	(199)	(8)	(104)	158
Depreciation and Amortization
Total depreciation and amortization	297	276	561	548
Adjustments
Adjustments:
Interest expense	(3,062)	(3,648)	(5,978)	(7,346)
Income/(losses) from equity investment	345	(240)	175	(435)
Other (expense)/income, net	$ (135)	$ 6	$ (779)	$ 160

Segment Reporting - Net Sales b

Segment Reporting - Net Sales by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 120,630	$ 117,115	$ 241,245	$ 228,600
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	113,665	107,694	224,051	211,336
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 6,965	$ 9,421	$ 17,194	$ 17,264

Segment Reporting - Assets by G

Segment Reporting - Assets by Geographic Region (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	$ 297,931	$ 307,838
Total Assets	628,825	634,749
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	294,561	304,807
Total Assets	610,355	617,050
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	3,370	3,031
Total Assets	$ 18,470	$ 17,699

Fair Value Disclosures (Details

Fair Value Disclosures (Details) - Recurring - Level 2 - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Natural Gas Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 100	$ (200)
Tax on derivative instruments	100	119
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,000	1,200
Tax on derivative instruments	$ 500	$ 600