Continental Building Products (CBPX) 10-Q 2 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Document and Entity Information [Abstract]
Title of 12(b) Security	Common Stock, $0.001 par value per share
Document Type	10-Q
Document Quarterly Report	true
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-36293
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	CBPX
Entity Registrant Name	CONTINENTAL BUILDING PRODUCTS, INC.
Entity Central Index Key	0001592480
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		34,688,206
Entity Interactive Data Current	Yes
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	61-1718923
Entity Address, Address Line One	12950 Worldgate Drive
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Herndon
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20170
City Area Code	(703)
Local Phone Number	480-3800

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 124,206	$ 139,268	$ 246,238	$ 256,070
Cost of goods sold	95,970	98,263	186,756	184,879
Gross profit	28,236	41,005	59,482	71,191
Selling and administrative expense	9,118	10,445	18,771	19,869
Loss on intangible asset impairment	2,911	0	2,911	0
Gain from insurance recoveries, net	0	0	1,513	0
Gain on Business Interruption Insurance Recovery	3,238	0	3,238	0
Operating income	19,445	30,560	42,551	51,322
Other expense, net	(66)	(87)	(102)	(227)
Interest expense, net	(2,395)	(2,694)	(4,887)	(5,414)
Income before losses from equity method investment and provision for income taxes	16,984	27,779	37,562	45,681
Losses from equity method investment	(367)	(391)	(412)	(755)
Income before provision for income taxes	16,617	27,388	37,150	44,926
Provision for income taxes	(3,769)	(5,493)	(8,376)	(9,385)
Net income	$ 12,848	$ 21,895	$ 28,774	$ 35,541
Net income per share:
Basic (usd per share)	$ 0.37	$ 0.59	$ 0.82	$ 0.96
Diluted (usd per share)	$ 0.37	$ 0.59	$ 0.82	$ 0.95
Weighted average shares outstanding:
Basic (shares)	34,804,588	36,879,774	35,025,208	37,154,750
Diluted (shares)	34,870,525	37,027,997	35,109,165	37,314,947

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 12,848	$ 21,895	$ 28,774	$ 35,541
Foreign currency translation adjustment	305	(313)	629	(795)
Derivative instrument adjustments, net of taxes	(1,662)	452	(2,040)	1,498
Other comprehensive (loss)/income	(1,357)	139	(1,411)	703
Comprehensive income	$ 11,491	$ 22,034	$ 27,363	$ 36,244

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents	$ 110,612	$ 102,633
Trade receivables, net	39,926	38,454
Inventories, net	33,938	32,225
Prepaid and other current assets	6,742	19,805
Total current assets	191,218	193,117
Property, plant and equipment, net	284,413	288,368
Customer relationships and other intangibles, net	56,051	62,680
Goodwill	119,945	119,945
Equity method investment	7,263	7,975
Operating lease - right of use assets	840
Debt issuance costs	206	296
Total Assets	659,936	672,381
Liabilities:
Accounts payable	31,650	48,060
Accrued and other liabilities	9,137	12,815
Debt, current portion	1,709	1,669
Operating lease liabilities, current portion	629
Total current liabilities	43,125	62,544
Deferred taxes and other long-term liabilities	19,175	20,204
Debt, non-current portion	261,014	261,886
Operating lease liabilities, non-current portion	834
Total Liabilities	324,148	344,634
Shareholders' Equity:
Undesignated preferred stock, par value $0.001 per share; 10,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.001 par value per share; 190,000,000 shares authorized; 44,539,759 and 44,472,214 shares issued and 34,688,206 and 35,401,868 shares outstanding as of June 30, 2019 and December 31, 2018, respectively	44	44
Additional paid-in capital	328,216	327,515
Less: Treasury stock	(229,073)	(209,050)
Accumulated other comprehensive loss	(4,802)	(3,391)
Accumulated earnings	241,403	212,629
Total Shareholders' Equity	335,788	327,747
Total Liabilities and Shareholders' Equity	$ 659,936	$ 672,381

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Undesignated preferred stock, par value (usd per share)	$ 0.001	$ 0.001
Undesignated preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Undesignated preferred stock, shares issued (in shares)	0	0
Undesignated preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	190,000,000	190,000,000
Common stock, shares issued (in shares)	44,539,759	44,472,214
Common stock, shares outstanding (in shares)	34,688,206	35,401,868

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 28,774	$ 35,541
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,091	21,386
Amortization of debt issuance costs and debt discount	616	629
Gain from insurance recoveries, net	(1,513)	0
Loss on intangible asset impairment	2,911	0
Losses from equity method investment	412	755
Amortization of deferred gain on terminated swaps	(579)	(317)
Share-based compensation	1,144	1,611
Change in assets and liabilities:
Trade receivables	(1,492)	(4,647)
Inventories	(1,614)	(2,896)
Prepaid expenses and other current assets	12,989	4,369
Accounts payable	(16,320)	(2,078)
Accrued and other current liabilities	(4,753)	(955)
Other long-term liabilities	(116)	(622)
Net cash provided by operating activities	41,550	52,776
Cash flows from investing activities:
Payments for property, plant and equipment	(12,346)	(13,006)
Payments for intangible assets	(1,019)	(790)
Proceeds from insurance recoveries	1,589	0
Capital contributions to equity method investment	(90)	(438)
Distributions from equity method investment	390	78
Net cash used in investing activities	(11,476)	(14,156)
Cash flows from financing activities:
Proceeds from exercise of stock options	118	11
Tax withholdings on share-based compensation	(1,165)	(547)
Principal payments for debt	(1,358)	(1,358)
Payments to repurchase common stock	(20,023)	(24,562)
Net cash used in financing activities	(22,428)	(26,456)
Effect of foreign exchange rates on cash and cash equivalents	333	(320)
Net change in cash and cash equivalents	7,979	11,844
Cash, beginning of period	102,633	72,521
Cash, end of period	$ 110,612	$ 84,365

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Earnings
Beginning Balance at Dec. 31, 2017	$ 318,026	$ 44	$ 325,391	$ (143,357)	$ (2,649)	$ 138,597
Beginning balance (in shares) at Dec. 31, 2017		37,532,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,646					13,646
Other comprehensive income (loss), net of tax	564				564
Purchase of treasury shares	(14,550)	$ 0		(14,550)
Purchase of treasury shares ( in shares)		(530,600)
Stock option exercise	11	$ 0	11
Stock option exercise (in shares)		781
Share-based compensation	213	$ 0	213
Share-based compensation (in shares)		85,838
Ending Balance at Mar. 31, 2018	317,910	$ 44	325,615	(157,907)	(2,085)	152,243
Ending balance (in shares) at Mar. 31, 2018		37,088,978
Beginning Balance at Dec. 31, 2017	318,026	$ 44	325,391	(143,357)	(2,649)	138,597
Beginning balance (in shares) at Dec. 31, 2017		37,532,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,541
Other comprehensive income (loss), net of tax	703
Ending Balance at Jun. 30, 2018	330,911	$ 44	326,594	(167,919)	(1,946)	174,138
Ending balance (in shares) at Jun. 30, 2018		36,748,879
Beginning Balance at Mar. 31, 2018	317,910	$ 44	325,615	(157,907)	(2,085)	152,243
Beginning balance (in shares) at Mar. 31, 2018		37,088,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,895					21,895
Other comprehensive income (loss), net of tax	139				139
Purchase of treasury shares	(10,012)	$ 0		(10,012)
Purchase of treasury shares ( in shares)		(344,908)
Stock option exercise	0	$ 0	0
Stock option exercise (in shares)		2,706
Share-based compensation	979	$ 0	979
Share-based compensation (in shares)		2,103
Ending Balance at Jun. 30, 2018	330,911	$ 44	326,594	(167,919)	(1,946)	174,138
Ending balance (in shares) at Jun. 30, 2018		36,748,879
Beginning Balance at Dec. 31, 2018	327,747	$ 44	327,515	(209,050)	(3,391)	212,629
Beginning balance (in shares) at Dec. 31, 2018		35,401,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,926					15,926
Other comprehensive income (loss), net of tax	(54)				(54)
Purchase of treasury shares	(5,005)	$ 0		(5,005)
Purchase of treasury shares ( in shares)		(191,907)
Stock option exercise	118	$ 0	118
Stock option exercise (in shares)		6,500
Share-based compensation	35	$ 0	35
Share-based compensation (in shares)		58,571
Ending Balance at Mar. 31, 2019	338,767	$ 44	327,668	(214,055)	(3,445)	228,555
Ending balance (in shares) at Mar. 31, 2019		35,275,032
Beginning Balance at Dec. 31, 2018	327,747	$ 44	327,515	(209,050)	(3,391)	212,629
Beginning balance (in shares) at Dec. 31, 2018		35,401,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,774
Other comprehensive income (loss), net of tax	(1,411)
Ending Balance at Jun. 30, 2019	335,788	$ 44	328,216	(229,073)	(4,802)	241,403
Ending balance (in shares) at Jun. 30, 2019		34,688,206
Beginning Balance at Mar. 31, 2019	338,767	$ 44	327,668	(214,055)	(3,445)	228,555
Beginning balance (in shares) at Mar. 31, 2019		35,275,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,848					12,848
Other comprehensive income (loss), net of tax	(1,357)				(1,357)
Purchase of treasury shares	(15,018)	$ 0		(15,018)
Purchase of treasury shares ( in shares)		(589,300)
Stock option exercise	0	$ 0	0
Stock option exercise (in shares)		0
Share-based compensation	548	$ 0	548
Share-based compensation (in shares)		2,474
Ending Balance at Jun. 30, 2019	$ 335,788	$ 44	$ 328,216	$ (229,073)	$ (4,802)	$ 241,403
Ending balance (in shares) at Jun. 30, 2019		34,688,206

Background and Nature of Operat

Background and Nature of Operations	6 Months Ended
	Jun. 30, 2019
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. 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.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
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, 2019. 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, 2018 included in the Company's Annual Report on Form 10-K for the fiscal year then ended (the "2018 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 Transactions and Other Activity For the Six Months Ended, June 30, 2019 June 30, 2018 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating lease cash outflows $ 307 $ 299 Other activity: Acquisition of property, plant and equipment included in liabilities $ 2,960 $ 3,657 (d) Recent Accounting Pronouncements Accounting Standards Recently Adopted The Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2016-02, "Leases.", as of January 1, 2019 . The Company elected the transition package of practical expedients permitted within ASU 2016-02, which among other things, allowed the Company to carryforward the historical lease classification. In addition, the Company elected the comparative period practical expedient, which allowed the Company to implement the guidance as of the effective date without having to adjust the comparative financial statements. Instead, under this expedient, companies recognize the cumulative effect adjustment in equity. The Company also made an accounting policy election that leases with an initial term of 12 months or less will not be recorded on the balance sheet and will result in the recognition of those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. The adoption of the standard resulted in recognition of approximately $1.0 million in right of use assets and $1.7 million in lease liabilities for operating leases on the Company's Consolidated Balance Sheet, with no impact to its retained earnings, Consolidated Statement of Operations and Consolidated Statement of Cash Flows. The Company adopted ASU 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities," as of January 1, 2019. This ASU expands an entity's ability to hedge non-financial and financial risk components and reduce complexity in fair value hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The adoption of the standard did not have a material impact on the Company's Consolidated Financial Statements. Accounting Standards Not Yet Adopted 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 2018, the FASB issued ASU 2018-13, "Fair Value Measurements (Topic 820), Changes to the Disclosure Requirements for Fair Value Measurement." This ASU eliminates certain disclosure requirements for fair value measurements for all entities, requires public entities to disclose certain new information and modifies some disclosure requirements. 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 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract." This ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. 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. (e) Reclassifications Certain reclassifications of prior year information were made to conform to the 2019 presentation. These reclassifications had no material impact on the Company's Consolidated Financial Statements.

Trade Receivables, Net

Trade Receivables, Net	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Trade Receivables, Net	TRADE RECEIVABLES, NET Table 3: Details of Trade Receivables, Net June 30, 2019 December 31, 2018 (in thousands) Trade receivables, gross $ 40,773 $ 39,426 Allowance for cash discounts and doubtful accounts (847 ) (972 ) Trade receivables, net $ 39,926 $ 38,454 Trade receivables are recorded net of credit memos issued during the normal course of business.

Inventories, Net

Inventories, Net	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventories, Net	INVENTORIES, NET Table 4: Details of Inventories, Net June 30, 2019 December 31, 2018 (in thousands) Finished products $ 7,937 $ 6,700 Raw materials 18,525 18,388 Supplies and other 7,476 7,137 Inventories, net $ 33,938 $ 32,225

Property, Plant and Equipment,

Property, Plant and Equipment, Net	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 (in thousands) Land $ 13,186 $ 13,185 Buildings 120,411 118,076 Plant machinery 311,739 292,219 Mobile equipment 15,551 15,163 Construction in progress 13,622 23,566 Property, plant and equipment, at cost 474,509 462,209 Accumulated depreciation (190,096 ) (173,841 ) Property, plant and equipment, net $ 284,413 $ 288,368 Depreciation expense was $8.3 million and $16.5 million for the three and six months ended June 30, 2019 , respectively, compared to $8.3 million and $16.3 million for the three and six months ended June 30, 2018 , respectively.

Customer Relationships and Othe

Customer Relationships and Other Intangibles, Net	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net (in thousands) Customer relationships $ 116,435 $ (69,668 ) $ 46,767 $ 116,180 $ (65,738 ) $ 50,442 Purchased software 8,987 (5,837 ) 3,150 8,225 (5,507 ) 2,718 Trademarks 10,038 (3,904 ) 6,134 14,772 (5,252 ) 9,520 Total $ 135,460 $ (79,409 ) $ 56,051 $ 139,177 $ (76,497 ) $ 62,680 Amortization expense was $2.3 million and $4.6 million for the three and six months ended June 30, 2019 , respectively, compared to $2.5 million and $5.1 million for the three and six months ended June, 2018 , respectively. During three months ended June 30, 2019 , the Company recognized a non-cash impairment loss of $2.9 million related to two trademarks, which the company discontinued the use of in the branding of its products in the current quarter. Table 6.2: Details of Future Amortization Expense of Customer Relationships and Other Intangibles As of June 30, 2019 (in thousands) July 1, 2019 through December 31, 2019 $ 4,627 2020 8,354 2021 7,491 2022 6,724 2023 5,794 Thereafter 23,061 Total $ 56,051

Accrued and Other Liabilities

Accrued and Other Liabilities	6 Months Ended
	Jun. 30, 2019
Payables and Accruals [Abstract]
Accrued and Other Liabilities	ACCRUED AND OTHER LIABILITIES Table 8: Details of Accrued and Other Liabilities June 30, 2019 December 31, 2018 (in thousands) Employee-related costs $ 4,438 $ 10,768 Property taxes 1,164 82 Income tax 286 — Other taxes 552 351 Other 2,697 1,614 Accrued and other liabilities $ 9,137 $ 12,815

Investment in Seven Hills

Investment in Seven Hills	6 Months Ended
	Jun. 30, 2019
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, pursuant to a paper supply agreement, 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 is 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 $11.8 million and $25.3 million for the three and six months ended June 30, 2019 , respectively, compared to $12.9 million and $25.1 million for the three and six months ended June, 2018 , respectively. As of June 30, 2019 , the Company had certain purchase commitments for paper totaling $37.9 million through 2022 .

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	DEBT Table 9.1: Details of Debt June 30, 2019 December 31, 2018 (in thousands) Amended and Restated Credit Agreement (1) $ 251,299 $ 252,658 Industrial revenue bonds (2) 16,200 16,200 Less: Original issue discount (net of amortization) (1,159 ) (1,285 ) Less: Debt issuance costs (3,617 ) (4,018 ) Total debt 262,723 263,555 Less: Current portion of long-term debt (1,709 ) (1,669 ) Long-term debt $ 261,014 $ 261,886 (1) As of June 30, 2019 and December 31, 2018, 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 2.00% . (2) As of June 30, 2019 and December 31, 2018, Industrial revenue bonds had a maturity date of December 1, 2025 and an interest rate of LIBOR plus 1.50% less an approximate 20 percent reduction in the rate related to the tax-free interest income to the bond holders. On August 18, 2016, the Company, Continental Building Products Operating Company, LLC 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 Company's existing 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 (the "Term Loan") and a $75.0 million senior secured revolving credit facility (the "Revolver"), which mature on August 18, 2023 and August 18, 2021, respectively. The interest rate under the Amended and Restated Credit Agreement was a spread over LIBOR of 2.75% and floor of 0.75% . On February 21, 2017 , the Company repriced its Term Loan lowering its interest rate by 25 basis points to LIBOR plus 2.50% . Subsequently, on December 6, 2017 , the Company further repriced its Term Loan lowering its interest rate by an additional 25 basis points to LIBOR plus 2.25% and allowing for a further reduction in the interest rate to LIBOR plus 2.00% based on the attainment of a total leverage ratio of 1.1 or better. All other terms and conditions under the Amended and Restated Credit Agreement remained the same. During both the six months ended June 30, 2019 and 2018 , the Company made $1.4 million of scheduled mandatory principal payments. Because the Company attained a total leverage ratio of less than 1.1 to 1 during the fourth quarter of 2018, the interest rate was further reduced pursuant to the terms of the Amended and Restated Credit Agreement to LIBOR plus 2.00% as of December 31, 2018. As of June 30, 2019 , the annual effective interest rate, including original issue discount and amortization of debt issuance costs, was 4.9% . In December 2018, the Company completed a financing of industrial revenue bonds due December 1, 2025 with a total commitment of $28 million . The bonds were issued by the County of Campbell, Kentucky and Putnam County Development Authority, pursuant to a trust indenture between the issuers and Huntington National Bank, as trustee. Proceeds of the bonds are loaned by the issuers to the Company under a loan agreement, whereby the Company is obligated to make loan payments to the issuers sufficient to pay all debt service and expenses related to the bonds. The Company's obligations under the loan agreement and related note bear interest at a fluctuating rate based on LIBOR plus 1.50% less an approximate 20 percent reduction in the rate related to the tax-free interest income to the bond holders. The loan agreement contains restrictions and covenants on our operations that are consistent with those contained in the Amended and Restated Credit Agreement mentioned below. There were no amounts outstanding under the Revolver as of June 30, 2019 or December 31, 2018 . Interest under the Revolver is floating, based on LIBOR plus 2.25% . 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, 2019 , based on draws and outstanding letters of credit and absence of violations of covenants, was $73.6 million . Table 9.2: Details of Future Minimum Principal Payments Due Amount Due (in thousands) July 1, 2019 through December 31, 2019 $ 1,357 2020 5,326 2021 6,196 2022 6,196 2023 245,074 Thereafter 3,350 Total Payments $ 267,499 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, taxes, 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, 2019 , the total leverage ratio of no greater than 5.0 under the financial covenant was not applicable at June 30, 2019 . The Company was in compliance with all applicable covenants under the Amended and Restated Credit Agreement and the loan agreement related to the industrial revenue bonds as of June 30, 2019 .

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS Commodity Derivative Instruments As of June 30, 2019 , the Company had 3.6 million mmBTUs (millions of British Thermal Units) in aggregate notional amount outstanding natural gas swap contracts to manage commodity price exposures. All of these contracts mature by June 30, 2020 . The Company elected to designate these derivative instruments as cash flow hedges in accordance with ASC 815-20, "Derivatives – Hedging" . No ineffectiveness was recorded on these contracts during the three and six months ended June 30, 2019 and 2018 . 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. On March 29, 2018, the Company terminated its interest rate swap agreements that were previously designated as a cash flow hedge and received $3.2 million in cash, the fair value of the swap on the termination date. The unrealized gain at termination remains in accumulated other comprehensive income and will be amortized into interest expense over the life of the original hedged instrument. During three and six months ended June 30, 2019 , $0.2 million and $0.5 million of unrealized gain, net of tax was amortized into interest expense, compared to $0.2 million for both three and six months ended June 30, 2018 . Also on March 29, 2018, the Company entered into new interest rate swap agreements for a combined notional amount of $100.0 million , which expire on September 30, 2020 and hedge the floating LIBOR on a portion of the Term Loan to an average fixed rate of 2.46% and LIBOR floor of 0.75% . The Company elected to designate these interest rate swaps as cash flow hedges for accounting purposes. No ineffectiveness was recorded on these contracts during the three and six months ended June 30, 2019 and 2018 . Table 10.1: Details of Derivatives Fair Value June 30, 2019 December 31, 2018 (in thousands) Assets Interest rate swap $ — $ 86 Commodity hedges — 61 Total assets $ — $ 147 Liabilities Interest rate swap $ 786 $ — Commodity hedges 1,210 105 Total liabilities $ 1,996 $ 105 Table 10.2: Gains/(losses) on Derivatives For the Three Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 2019 2018 2019 2018 Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax Gain/(loss) reclassified from AOCI into income (effective portion), net of tax Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax Gain/(loss) reclassified from AOCI into income (effective portion), net of tax (in thousands) Interest rate swap $ (372 ) $ 297 $ 292 $ 139 $ (533 ) $ 1,268 $ 595 $ 209 Commodity hedges (1,019 ) 197 (21 ) (97 ) (977 ) 245 (65 ) (194 ) Total $ (1,391 ) $ 494 $ 271 $ 42 $ (1,510 ) $ 1,513 $ 530 $ 15 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, 2019 , the Company's derivatives were in a $2.0 million net liability position and recorded in Other current liabilities. 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, 2019 , the Company had no collateral posted with its counterparties related to the derivatives.

Leases Leases

Leases Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	LEASES 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. Certain building leases also include options to renew, with renewal terms that can extend the lease term up to 5 years. The exercise of lease renewal options is at the Company's sole discretion. Table 11.1: Components of lease expense For the Three Months Ended, For the Six Months Ended, June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) Operating lease cost $ 100 $ 99 $ 201 $ 198 Short term lease cost 564 711 1,075 1,446 Total lease cost $ 664 $ 810 $ 1,276 $ 1,644 Table 11.2: Maturities of lease liabilities Operating leases (in thousands) July 1, 2019 through December 31, 2019 $ 311 2020 637 2021 600 2022 — 2023 — Total lease payments $ 1,548 Less imputed interest (85 ) Present value of lease liabilities $ 1,463 Table 11.3: Details of lease term and discount rate As of June 30, 2019 Weighted-average remaining lease term: Operating leases 3 years Weighted-average discount rate: Operating leases 4.52 %

Treasury Stock

Treasury Stock	6 Months Ended
	Jun. 30, 2019
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, the Company has repurchased shares of its common stock in the open market and in private transactions. Since the initial authorization, the Company' Board of Directors has expanded and extended the stock repurchase program. The most recent authorization on February 21, 2018 expanded the program to a total of $300 million and also extended the expiration date to December 31, 2019 . As of June 30, 2019, there was approximately $111.0 million of capacity remaining under this repurchase authorization. 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 12: Details of Treasury Stock Activity June 30, 2019 June 30, 2018 Shares Amount (1) Average Share Price (1) Shares Amount (1) Average Share Price (1) (in thousands, except share data) For the Three Months Ended: Beginning Balance 9,262,253 $ 214,055 $ 23.11 7,319,417 $ 157,907 $ 21.57 Repurchases on open market 589,300 15,018 25.48 344,908 10,012 29.03 Ending Balance 9,851,553 $ 229,073 $ 23.25 7,664,325 $ 167,919 $ 21.91 For the Six Months Ended: Beginning Balance 9,070,346 $ 209,050 $ 23.05 6,788,817 $ 143,357 $ 21.12 Repurchases on open market 781,207 20,023 25.63 875,508 24,562 28.05 Ending Balance 9,851,553 $ 229,073 $ 23.25 7,664,325 $ 167,919 $ 21.91 ( 1 ) Includes commissions paid for repurchases on open market.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION For the three and six months ended June 30, 2019 , the Company recognized share-based compensation expenses of $0.6 million and $ 1.1 million , respectively, compared to $1.0 million and $1.6 million for the three and six months ended June 30, 2018 , respectively. The expenses related to share-based compensation awards were recorded in selling and administrative expenses. As of June 30, 2019 , there was $5.6 million of total unrecognized compensation cost related to non-vested stock options, restricted stock awards, restricted stock units and performance-based restricted stock units. This cost is expected to be recognized over a weighted average period of 2.6 years .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS Table 14: Details of 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, 2018 $ (5,027 ) $ 1,636 $ (3,391 ) Other comprehensive income/(loss) before reclassifications 629 (1,510 ) (881 ) Amounts reclassified from accumulated other comprehensive loss — (530 ) (530 ) Net current period other comprehensive income/(loss) 629 (2,040 ) (1,411 ) Balance as of June 30, 2019 $ (4,398 ) $ (404 ) $ (4,802 )

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company’s estimated annual effective tax rate is 22.5% . The Company is subject to federal income taxes and various state, provincial and local income taxes. The Company is subject to audit examinations at the U.S. 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, 2019
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, 2019 , approximately 1,923 and 42,088 share-based compensation awards 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 2018 were zero and 31,474 , respectively. Table 16: Details of Basic and Dilutive Earnings Per Share For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (dollars in thousands, except for share and per share amounts) Net income $ 12,848 $ 21,895 $ 28,774 $ 35,541 Weighted average number of shares outstanding - basic 34,804,588 36,879,774 35,025,208 37,154,750 Effect of dilutive securities: Restricted stock awards — — — 1,755 Restricted stock units 18,753 56,188 37,134 64,100 Performance-based restricted stock units 31,452 63,799 30,613 66,654 Stock options 15,732 28,236 16,210 27,688 Total effect of dilutive securities 65,937 148,223 83,957 160,197 Weighted average number of shares outstanding - diluted 34,870,525 37,027,997 35,109,165 37,314,947 Basic earnings per share $ 0.37 $ 0.59 $ 0.82 $ 0.96 Diluted earnings per share $ 0.37 $ 0.59 $ 0.82 $ 0.95

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Commitments The Company has non-capital purchase commitments that primarily relate to gas, gypsum, paper and other raw materials. The total amounts purchased under such commitments were $19.5 million and $41.4 million for the three and six months ended June 30, 2019 , respectively, compared to $23.3 million and $43.5 million for the three and six months ended June 30, 2018 , respectively. Table 17: Details of Purchase Commitments As of June 30, 2019 (in thousands) July 1, 2019 through December 31, 2019 $ 20,311 2020 38,906 2021 36,591 2022 28,035 2023 12,254 Thereafter 48,144 Total $ 184,241 Contingent obligations Under certain circumstances, the Company provides letters of credit related to its natural gas and other supply purchases. As of June 30, 2019 and December 31, 2018 , the Company had outstanding letters of credit of approximately $1.4 million . 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, 2019 and December 31, 2018 , 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. On January 24, 2019, Company's Buchanan, New York plant experienced a significant equipment malfunction, resulting in an outage at the plant. The plant was off-line while repairs were made through March 15, 2019. While the Buchanan plant was down, the Company increased production at its plants in Silver Grove, Kentucky and Palatka, Florida to offset a portion of the lost production from the Buchanan plant. The Company has standard insurance coverage that is intended to cover circumstances such as these, including business interruption insurance. The Company's insurance coverage is designed to cover the direct costs of rebuilding the damaged equipment, costs incurred to re-direct products from the Company's other plants, and the lost contribution margin of the sales that otherwise would have been made if the plant was operating normally. During the three months ended June 30, 2019, the Company recorded $3.2 million to compensate for operating income associated with the lost sales from business interruption that otherwise would have been made if the plant had been operating normally. The Company is working closely with its insurance advisers and carrier to finalize the claim associated with business interruption coverage. Table 20.1: Details of Insurance Claims and Cash Payments Related to Buchanan Outage Excluding Amounts Received from Business Interruption for Lost Operating Income Associated with Lost Sales Claim Details Cash Details Claim Amount Insurance Deductible Net recovery recorded in six months ended June 30, 2019 Cash received in the six months ended June 30, 2019 Receivable Recorded as of June 30, 2019 (in thousands) Rebuild property, plant and equipment damaged (a) $ 1,839 $ 250 $ 1,589 $ 1,589 $ — Directs costs associated with business interruption (b) 3,015 — 3,015 2,377 638 $ 4,854 $ 250 $ 4,604 $ 3,966 $ 638 (a) The rebuild of property, plant and equipment damaged and related net recovery resulted in a net gain of $1.5 million . (b) Direct costs associated with the business interruption include various expenses such as additional freight to ship to customers at greater distances from other plants, additional freight costs to reroute incoming raw materials and other various costs that were incurred as a result of the Buchanan outage and are expected to be covered by the Company's insurance policy. The net recovery of direct costs associated with business interruption were netted against actual costs incurred resulting in a net impact of zero to the income statement. Table 20.2: Details of Gain from Insurance Recoveries, Net For the Six Months Ended June 30, 2019 (in thousands) Cost to rebuild property, plant and equipment (capitalized) $ 1,839 Insurance deductible 250 Net recoveries from insurance policy 1,589 Write-off of property, plant and equipment 76 Gain from insurance recoveries, net $ 1,513

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2019
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 97.3% of the Company's revenues for the three and six months ended June 30, 2019 , respectively, compared to 97.4% and 97.1% of the Company's revenues for the three and six months ended June 30, 2018 , 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 customer generating the revenue. 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 18.1: Segment Reporting For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) Net Sales: Wallboard $ 120,748 $ 135,667 $ 239,692 $ 248,638 Other 3,458 3,601 6,546 7,432 Total net sales $ 124,206 $ 139,268 $ 246,238 $ 256,070 Operating Income: Wallboard $ 19,886 $ 31,122 $ 43,481 $ 52,152 Other (441 ) (562 ) (930 ) (830 ) Total operating income $ 19,445 $ 30,560 $ 42,551 $ 51,322 Adjustments: Interest expense $ (2,395 ) $ (2,694 ) $ (4,887 ) $ (5,414 ) Losses from equity investment (367 ) (391 ) (412 ) (755 ) Other expense, net (66 ) (87 ) (102 ) (227 ) Income before provision for income taxes $ 16,617 $ 27,388 $ 37,150 $ 44,926 Depreciation and Amortization: Wallboard $ 10,328 $ 10,411 $ 20,603 $ 20,717 Other 243 394 488 669 Total depreciation and amortization $ 10,571 $ 10,805 $ 21,091 $ 21,386 Table 18.2: Details of Net Sales By Geographic Region For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) United States $ 118,195 $ 132,513 $ 234,906 $ 242,488 Canada 6,011 6,755 11,332 13,582 Net sales $ 124,206 $ 139,268 $ 246,238 $ 256,070 Table 18.3: Details of Assets By Geographic Region Fixed Assets Total Assets June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 (in thousands) United States $ 281,268 $ 285,202 $ 642,840 $ 655,849 Canada 3,145 3,166 17,096 16,532 Total $ 284,413 $ 288,368 $ 659,936 $ 672,381

Fair Value Disclosures

Fair Value Disclosures	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures	FAIR VALUE DISCLOSURES 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, 2019 and December 31, 2018 , 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, 2019 that are recorded at fair value on a recurring basis are the natural gas hedges and interest rate swaps. 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. Table 19.1: Fair Value Hierarchy - 2019 As of June 30, 2019 Level 1 Level 2 Level 3 Balance (in thousands) Asset Interest rate swap $ — $ — $ — $ — Commodity derivatives — — — — Total assets $ — $ — $ — $ — Liabilities Interest rate swap $ — $ 786 $ — $ 786 Commodity derivatives — 1,210 — 1,210 Total liabilities $ — $ 1,996 $ — $ 1,996 Table 19.2: Fair Value Hierarchy - 2018 As of December 31, 2018 Level 1 Level 2 Level 3 Balance (in thousands) Asset Interest rate swap $ — $ 86 $ — $ 86 Commodity derivatives — 61 — 61 Total assets $ — $ 147 $ — $ 147 Liabilities Interest rate swap $ — $ — $ — $ — Commodity derivatives — 105 — 105 Total liabilities $ — $ 105 $ — $ 105

Buchanan Plant Outage Buchanan

Buchanan Plant Outage Buchanan Plant Outage	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Buchanan Plant Outage	COMMITMENTS AND CONTINGENCIES Commitments The Company has non-capital purchase commitments that primarily relate to gas, gypsum, paper and other raw materials. The total amounts purchased under such commitments were $19.5 million and $41.4 million for the three and six months ended June 30, 2019 , respectively, compared to $23.3 million and $43.5 million for the three and six months ended June 30, 2018 , respectively. Table 17: Details of Purchase Commitments As of June 30, 2019 (in thousands) July 1, 2019 through December 31, 2019 $ 20,311 2020 38,906 2021 36,591 2022 28,035 2023 12,254 Thereafter 48,144 Total $ 184,241 Contingent obligations Under certain circumstances, the Company provides letters of credit related to its natural gas and other supply purchases. As of June 30, 2019 and December 31, 2018 , the Company had outstanding letters of credit of approximately $1.4 million . 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, 2019 and December 31, 2018 , 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. On January 24, 2019, Company's Buchanan, New York plant experienced a significant equipment malfunction, resulting in an outage at the plant. The plant was off-line while repairs were made through March 15, 2019. While the Buchanan plant was down, the Company increased production at its plants in Silver Grove, Kentucky and Palatka, Florida to offset a portion of the lost production from the Buchanan plant. The Company has standard insurance coverage that is intended to cover circumstances such as these, including business interruption insurance. The Company's insurance coverage is designed to cover the direct costs of rebuilding the damaged equipment, costs incurred to re-direct products from the Company's other plants, and the lost contribution margin of the sales that otherwise would have been made if the plant was operating normally. During the three months ended June 30, 2019, the Company recorded $3.2 million to compensate for operating income associated with the lost sales from business interruption that otherwise would have been made if the plant had been operating normally. The Company is working closely with its insurance advisers and carrier to finalize the claim associated with business interruption coverage. Table 20.1: Details of Insurance Claims and Cash Payments Related to Buchanan Outage Excluding Amounts Received from Business Interruption for Lost Operating Income Associated with Lost Sales Claim Details Cash Details Claim Amount Insurance Deductible Net recovery recorded in six months ended June 30, 2019 Cash received in the six months ended June 30, 2019 Receivable Recorded as of June 30, 2019 (in thousands) Rebuild property, plant and equipment damaged (a) $ 1,839 $ 250 $ 1,589 $ 1,589 $ — Directs costs associated with business interruption (b) 3,015 — 3,015 2,377 638 $ 4,854 $ 250 $ 4,604 $ 3,966 $ 638 (a) The rebuild of property, plant and equipment damaged and related net recovery resulted in a net gain of $1.5 million . (b) Direct costs associated with the business interruption include various expenses such as additional freight to ship to customers at greater distances from other plants, additional freight costs to reroute incoming raw materials and other various costs that were incurred as a result of the Buchanan outage and are expected to be covered by the Company's insurance policy. The net recovery of direct costs associated with business interruption were netted against actual costs incurred resulting in a net impact of zero to the income statement. Table 20.2: Details of Gain from Insurance Recoveries, Net For the Six Months Ended June 30, 2019 (in thousands) Cost to rebuild property, plant and equipment (capitalized) $ 1,839 Insurance deductible 250 Net recoveries from insurance policy 1,589 Write-off of property, plant and equipment 76 Gain from insurance recoveries, net $ 1,513

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	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, 2019. 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, 2018 included in the Company's Annual Report on Form 10-K for the fiscal year then ended (the "2018 10-K"). The Company has continued to follow the accounting policies set forth in those financial statements. 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	Recent Accounting Pronouncements Accounting Standards Recently Adopted The Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Update ("ASU") 2016-02, "Leases.", as of January 1, 2019 . The Company elected the transition package of practical expedients permitted within ASU 2016-02, which among other things, allowed the Company to carryforward the historical lease classification. In addition, the Company elected the comparative period practical expedient, which allowed the Company to implement the guidance as of the effective date without having to adjust the comparative financial statements. Instead, under this expedient, companies recognize the cumulative effect adjustment in equity. The Company also made an accounting policy election that leases with an initial term of 12 months or less will not be recorded on the balance sheet and will result in the recognition of those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. The adoption of the standard resulted in recognition of approximately $1.0 million in right of use assets and $1.7 million in lease liabilities for operating leases on the Company's Consolidated Balance Sheet, with no impact to its retained earnings, Consolidated Statement of Operations and Consolidated Statement of Cash Flows. The Company adopted ASU 2017-12, "Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities," as of January 1, 2019. This ASU expands an entity's ability to hedge non-financial and financial risk components and reduce complexity in fair value hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The adoption of the standard did not have a material impact on the Company's Consolidated Financial Statements. Accounting Standards Not Yet Adopted 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 2018, the FASB issued ASU 2018-13, "Fair Value Measurements (Topic 820), Changes to the Disclosure Requirements for Fair Value Measurement." This ASU eliminates certain disclosure requirements for fair value measurements for all entities, requires public entities to disclose certain new information and modifies some disclosure requirements. 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 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract." This ASU requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. 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.
Reclassifications	Reclassifications Certain reclassifications of prior year information were made to conform to the 2019 presentation. These reclassifications had no material impact on the Company's Consolidated Financial Statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Supplemental Cash Flow Disclosure Table 2.1: Certain Cash Transactions and Other Activity For the Six Months Ended, June 30, 2019 June 30, 2018 (in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating lease cash outflows $ 307 $ 299 Other activity: Acquisition of property, plant and equipment included in liabilities $ 2,960 $ 3,657

Trade Receivables, Net (Tables)

Trade Receivables, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Detail of Receivables, Net	Table 3: Details of Trade Receivables, Net June 30, 2019 December 31, 2018 (in thousands) Trade receivables, gross $ 40,773 $ 39,426 Allowance for cash discounts and doubtful accounts (847 ) (972 ) Trade receivables, net $ 39,926 $ 38,454 Trade receivables are recorded net of credit memos issued during the normal course of business.

Inventories, Net (Tables)

Inventories, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Composition of Inventories	Table 4: Details of Inventories, Net June 30, 2019 December 31, 2018 (in thousands) Finished products $ 7,937 $ 6,700 Raw materials 18,525 18,388 Supplies and other 7,476 7,137 Inventories, net $ 33,938 $ 32,225

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Details	Table 5: Details of Property, Plant and Equipment, Net June 30, 2019 December 31, 2018 (in thousands) Land $ 13,186 $ 13,185 Buildings 120,411 118,076 Plant machinery 311,739 292,219 Mobile equipment 15,551 15,163 Construction in progress 13,622 23,566 Property, plant and equipment, at cost 474,509 462,209 Accumulated depreciation (190,096 ) (173,841 ) Property, plant and equipment, net $ 284,413 $ 288,368

Customer Relationships and Ot_2

Customer Relationships and Other Intangibles, Net (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 December 31, 2018 Gross Accumulated Amortization Net Gross Accumulated Amortization Net (in thousands) Customer relationships $ 116,435 $ (69,668 ) $ 46,767 $ 116,180 $ (65,738 ) $ 50,442 Purchased software 8,987 (5,837 ) 3,150 8,225 (5,507 ) 2,718 Trademarks 10,038 (3,904 ) 6,134 14,772 (5,252 ) 9,520 Total $ 135,460 $ (79,409 ) $ 56,051 $ 139,177 $ (76,497 ) $ 62,680
Future Amortization Expense of Customer Relationships and Other Intangibles	Table 6.2: Details of Future Amortization Expense of Customer Relationships and Other Intangibles As of June 30, 2019 (in thousands) July 1, 2019 through December 31, 2019 $ 4,627 2020 8,354 2021 7,491 2022 6,724 2023 5,794 Thereafter 23,061 Total $ 56,051

Accrued and Other Liabilities (

Accrued and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Payables and Accruals [Abstract]
Details of Accrued and Other Liabilities	Table 8: Details of Accrued and Other Liabilities June 30, 2019 December 31, 2018 (in thousands) Employee-related costs $ 4,438 $ 10,768 Property taxes 1,164 82 Income tax 286 — Other taxes 552 351 Other 2,697 1,614 Accrued and other liabilities $ 9,137 $ 12,815

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Details of Debt	Table 9.1: Details of Debt June 30, 2019 December 31, 2018 (in thousands) Amended and Restated Credit Agreement (1) $ 251,299 $ 252,658 Industrial revenue bonds (2) 16,200 16,200 Less: Original issue discount (net of amortization) (1,159 ) (1,285 ) Less: Debt issuance costs (3,617 ) (4,018 ) Total debt 262,723 263,555 Less: Current portion of long-term debt (1,709 ) (1,669 ) Long-term debt $ 261,014 $ 261,886 (1) As of June 30, 2019 and December 31, 2018, 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 2.00% . (2) As of June 30, 2019 and December 31, 2018, Industrial revenue bonds had a maturity date of December 1, 2025 and an interest rate of LIBOR plus 1.50% less an approximate 20 percent reduction in the rate related to the tax-free interest income to the bond holders.
Future Minimum Principal Payments Due Under the Credit Agreements	Table 9.2: Details of Future Minimum Principal Payments Due Amount Due (in thousands) July 1, 2019 through December 31, 2019 $ 1,357 2020 5,326 2021 6,196 2022 6,196 2023 245,074 Thereafter 3,350 Total Payments $ 267,499

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Table 10.1: Details of Derivatives Fair Value June 30, 2019 December 31, 2018 (in thousands) Assets Interest rate swap $ — $ 86 Commodity hedges — 61 Total assets $ — $ 147 Liabilities Interest rate swap $ 786 $ — Commodity hedges 1,210 105 Total liabilities $ 1,996 $ 105
Derivative Instruments, Gain (Loss)	Table 10.2: Gains/(losses) on Derivatives For the Three Months Ended June 30, For the Six Months Ended June 30, 2019 2018 2019 2018 2019 2018 2019 2018 Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax Gain/(loss) reclassified from AOCI into income (effective portion), net of tax Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax Gain/(loss) reclassified from AOCI into income (effective portion), net of tax (in thousands) Interest rate swap $ (372 ) $ 297 $ 292 $ 139 $ (533 ) $ 1,268 $ 595 $ 209 Commodity hedges (1,019 ) 197 (21 ) (97 ) (977 ) 245 (65 ) (194 ) Total $ (1,391 ) $ 494 $ 271 $ 42 $ (1,510 ) $ 1,513 $ 530 $ 15

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Expense	Table 11.1: Components of lease expense For the Three Months Ended, For the Six Months Ended, June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) Operating lease cost $ 100 $ 99 $ 201 $ 198 Short term lease cost 564 711 1,075 1,446 Total lease cost $ 664 $ 810 $ 1,276 $ 1,644
Maturities of Lease Liabilities	Table 11.2: Maturities of lease liabilities Operating leases (in thousands) July 1, 2019 through December 31, 2019 $ 311 2020 637 2021 600 2022 — 2023 — Total lease payments $ 1,548 Less imputed interest (85 ) Present value of lease liabilities $ 1,463
Details of Lease Term and Discount Rate	Table 11.3: Details of lease term and discount rate As of June 30, 2019 Weighted-average remaining lease term: Operating leases 3 years Weighted-average discount rate: Operating leases 4.52 %

Treasury Stock (Tables)

Treasury Stock (Tables)	6 Months Ended
	Jun. 30, 2019
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 12: Details of Treasury Stock Activity June 30, 2019 June 30, 2018 Shares Amount (1) Average Share Price (1) Shares Amount (1) Average Share Price (1) (in thousands, except share data) For the Three Months Ended: Beginning Balance 9,262,253 $ 214,055 $ 23.11 7,319,417 $ 157,907 $ 21.57 Repurchases on open market 589,300 15,018 25.48 344,908 10,012 29.03 Ending Balance 9,851,553 $ 229,073 $ 23.25 7,664,325 $ 167,919 $ 21.91 For the Six Months Ended: Beginning Balance 9,070,346 $ 209,050 $ 23.05 6,788,817 $ 143,357 $ 21.12 Repurchases on open market 781,207 20,023 25.63 875,508 24,562 28.05 Ending Balance 9,851,553 $ 229,073 $ 23.25 7,664,325 $ 167,919 $ 21.91 ( 1 ) Includes commissions paid for repurchases on open market.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Changes in Accumulated Other Comprehensive (Loss)/Income by Category	Table 14: Details of 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, 2018 $ (5,027 ) $ 1,636 $ (3,391 ) Other comprehensive income/(loss) before reclassifications 629 (1,510 ) (881 ) Amounts reclassified from accumulated other comprehensive loss — (530 ) (530 ) Net current period other comprehensive income/(loss) 629 (2,040 ) (1,411 ) Balance as of June 30, 2019 $ (4,398 ) $ (404 ) $ (4,802 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 , approximately 1,923 and 42,088 share-based compensation awards 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 2018 were zero and 31,474 , respectively. Table 16: Details of Basic and Dilutive Earnings Per Share For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (dollars in thousands, except for share and per share amounts) Net income $ 12,848 $ 21,895 $ 28,774 $ 35,541 Weighted average number of shares outstanding - basic 34,804,588 36,879,774 35,025,208 37,154,750 Effect of dilutive securities: Restricted stock awards — — — 1,755 Restricted stock units 18,753 56,188 37,134 64,100 Performance-based restricted stock units 31,452 63,799 30,613 66,654 Stock options 15,732 28,236 16,210 27,688 Total effect of dilutive securities 65,937 148,223 83,957 160,197 Weighted average number of shares outstanding - diluted 34,870,525 37,027,997 35,109,165 37,314,947 Basic earnings per share $ 0.37 $ 0.59 $ 0.82 $ 0.96 Diluted earnings per share $ 0.37 $ 0.59 $ 0.82 $ 0.95

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Future Purchase Commitments by Year	Table 17: Details of Purchase Commitments As of June 30, 2019 (in thousands) July 1, 2019 through December 31, 2019 $ 20,311 2020 38,906 2021 36,591 2022 28,035 2023 12,254 Thereafter 48,144 Total $ 184,241

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Reporting	Table 18.1: Segment Reporting For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) Net Sales: Wallboard $ 120,748 $ 135,667 $ 239,692 $ 248,638 Other 3,458 3,601 6,546 7,432 Total net sales $ 124,206 $ 139,268 $ 246,238 $ 256,070 Operating Income: Wallboard $ 19,886 $ 31,122 $ 43,481 $ 52,152 Other (441 ) (562 ) (930 ) (830 ) Total operating income $ 19,445 $ 30,560 $ 42,551 $ 51,322 Adjustments: Interest expense $ (2,395 ) $ (2,694 ) $ (4,887 ) $ (5,414 ) Losses from equity investment (367 ) (391 ) (412 ) (755 ) Other expense, net (66 ) (87 ) (102 ) (227 ) Income before provision for income taxes $ 16,617 $ 27,388 $ 37,150 $ 44,926 Depreciation and Amortization: Wallboard $ 10,328 $ 10,411 $ 20,603 $ 20,717 Other 243 394 488 669 Total depreciation and amortization $ 10,571 $ 10,805 $ 21,091 $ 21,386
Net Sales By Geographic Region	Table 18.2: Details of Net Sales By Geographic Region For the Three Months Ended For the Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 (in thousands) United States $ 118,195 $ 132,513 $ 234,906 $ 242,488 Canada 6,011 6,755 11,332 13,582 Net sales $ 124,206 $ 139,268 $ 246,238 $ 256,070
Assets By Geographic Region	Table 18.3: Details of Assets By Geographic Region Fixed Assets Total Assets June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 (in thousands) United States $ 281,268 $ 285,202 $ 642,840 $ 655,849 Canada 3,145 3,166 17,096 16,532 Total $ 284,413 $ 288,368 $ 659,936 $ 672,381

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Table 19.1: Fair Value Hierarchy - 2019 As of June 30, 2019 Level 1 Level 2 Level 3 Balance (in thousands) Asset Interest rate swap $ — $ — $ — $ — Commodity derivatives — — — — Total assets $ — $ — $ — $ — Liabilities Interest rate swap $ — $ 786 $ — $ 786 Commodity derivatives — 1,210 — 1,210 Total liabilities $ — $ 1,996 $ — $ 1,996 Table 19.2: Fair Value Hierarchy - 2018 As of December 31, 2018 Level 1 Level 2 Level 3 Balance (in thousands) Asset Interest rate swap $ — $ 86 $ — $ 86 Commodity derivatives — 61 — 61 Total assets $ — $ 147 $ — $ 147 Liabilities Interest rate swap $ — $ — $ — $ — Commodity derivatives — 105 — 105 Total liabilities $ — $ 105 $ — $ 105

Buchanan Plant Outage (Tables)

Buchanan Plant Outage (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Buchanan Plant Outage	Table 20.1: Details of Insurance Claims and Cash Payments Related to Buchanan Outage Excluding Amounts Received from Business Interruption for Lost Operating Income Associated with Lost Sales Claim Details Cash Details Claim Amount Insurance Deductible Net recovery recorded in six months ended June 30, 2019 Cash received in the six months ended June 30, 2019 Receivable Recorded as of June 30, 2019 (in thousands) Rebuild property, plant and equipment damaged (a) $ 1,839 $ 250 $ 1,589 $ 1,589 $ — Directs costs associated with business interruption (b) 3,015 — 3,015 2,377 638 $ 4,854 $ 250 $ 4,604 $ 3,966 $ 638 (a) The rebuild of property, plant and equipment damaged and related net recovery resulted in a net gain of $1.5 million . (b) Direct costs associated with the business interruption include various expenses such as additional freight to ship to customers at greater distances from other plants, additional freight costs to reroute incoming raw materials and other various costs that were incurred as a result of the Buchanan outage and are expected to be covered by the Company's insurance policy. The net recovery of direct costs associated with business interruption were netted against actual costs incurred resulting in a net impact of zero to the income statement. Table 20.2: Details of Gain from Insurance Recoveries, Net For the Six Months Ended June 30, 2019 (in thousands) Cost to rebuild property, plant and equipment (capitalized) $ 1,839 Insurance deductible 250 Net recoveries from insurance policy 1,589 Write-off of property, plant and equipment 76 Gain from insurance recoveries, net $ 1,513

Background and Nature of Oper_2

Background and Nature of Operations - Description of Business and Acquisition (Detail)	Jun. 30, 2019facility
Wallboard
Business Acquisition [Line Items]
Number of operating facilities (facility)	3
Joint Compound
Business Acquisition [Line Items]
Number of operating facilities (facility)	1

Significant Accounting Polici_4

Significant Accounting Policies - Certain Cash and Non-Cash Transactions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Operating lease cash outflows	$ 307	$ 299
Acquisition of property, plant and equipment included in liabilities	$ 2,960	$ 3,657

Significant Accounting Polici_5

Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Operating lease - right of use assets	$ 840
Present value of lease liabilities	$ 1,463
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Operating lease - right of use assets		$ 1,000
Present value of lease liabilities		$ 1,700

Trade Receivables, Net - Detail

Trade Receivables, Net - Detail of Receivables, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade receivables, gross	$ 40,773	$ 39,426
Allowance for cash discounts and doubtful accounts	(847)	(972)
Trade receivables, net	$ 39,926	$ 38,454

Inventories, Net (Detail)

Inventories, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished products	$ 7,937	$ 6,700
Raw materials	18,525	18,388
Supplies and other	7,476	7,137
Inventories, net	$ 33,938	$ 32,225

Property, Plant and Equipment_3

Property, Plant and Equipment, Net - Property, Plant and Equipment Details (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 474,509	$ 462,209
Accumulated depreciation	(190,096)	(173,841)
Property, plant and equipment, net	284,413	288,368
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	13,186	13,185
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	120,411	118,076
Plant machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	311,739	292,219
Mobile equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	15,551	15,163
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 13,622	$ 23,566

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 8.3	$ 8.3	$ 16.5	$ 16.3

Customer Relationships and Ot_3

Customer Relationships and Other Intangibles, Net - Details of Customer Relationships and Other Intangibles, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 135,460	$ 139,177
Accumulated Amortization	(79,409)	(76,497)
Net	56,051	62,680
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	116,435	116,180
Accumulated Amortization	(69,668)	(65,738)
Net	46,767	50,442
Purchased software
Finite-Lived Intangible Assets [Line Items]
Gross	8,987	8,225
Accumulated Amortization	(5,837)	(5,507)
Net	3,150	2,718
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross	10,038	14,772
Accumulated Amortization	(3,904)	(5,252)
Net	$ 6,134	$ 9,520

Customer Relationships and Ot_4

Customer Relationships and Other Intangibles, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,300	$ 2,500	$ 4,600	$ 5,100
Loss on intangible asset impairment	$ 2,911	$ 0	$ 2,911	$ 0

Customer Relationships and Ot_5

Customer Relationships and Other Intangibles, Net - Future Amortization Expense of Customer Relationships and Other Intangibles (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
July 1, 2019 through December 31, 2019	$ 4,627
2020	8,354
2021	7,491
2022	6,724
2023	5,794
Thereafter	23,061
Net	$ 56,051	$ 62,680

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Cost of paperboard	$ 11.8	$ 12.9	$ 25.3	$ 25.1
Purchase commitments			$ 37.9

Accrued and Other Liabilities_2

Accrued and Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Employee-related costs	$ 4,438	$ 10,768
Property taxes	1,164	82
Income tax	286	0
Other taxes	552	351
Other	2,697	1,614
Accrued and other liabilities	$ 9,137	$ 12,815

Debt - Details of Debt (Detail)

Debt - Details of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 06, 2017	Feb. 21, 2017	Aug. 18, 2016	Jun. 30, 2019
Debt Instrument [Line Items]
Total debt, gross					$ 267,499
Less: Original issue discount (net of amortization)	$ (1,285)				(1,159)
Less: Debt issuance costs	(4,018)				(3,617)
Total debt	263,555				262,723
Less: Current portion of long-term debt	(1,669)				(1,709)
Long-term debt	261,886				261,014
Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)		2.25%	2.50%
Term Loan Facility | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Total debt, gross	$ 252,658				$ 251,299
Term Loan Facility | Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Floor rate				0.75%	0.75%
Debt, variable interest rate (as a percent)	2.00%			2.75%	2.00%
Industrial Revenue Bonds | Line of Credit | Industrial revenue bonds
Debt Instrument [Line Items]
Total debt, gross	$ 16,200				$ 16,200
Industrial Revenue Bonds | Line of Credit | Industrial revenue bonds | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)					1.50%
Reduction in reate related to the tax-free interest income					20.00%

Debt - Additional Information (

Debt - Additional Information (Detail)	Dec. 31, 2018USD ($)	Dec. 06, 2017	Feb. 21, 2017	Aug. 18, 2016USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2019USD ($)covenant	Jun. 30, 2018USD ($)
Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Decrease in basis spread, percentage		25.00%	0.25%
Leverage ratio (no greater than)		1.1			1.1
Number of covenants | covenant						1
Debt covenant trigger, line of credit facility amount less letters of credit threshold						$ 22,500,000
Amended and Restated Credit Agreement | Maximum
Debt Instrument [Line Items]
Leverage ratio (no greater than)						5
Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)		2.25%	2.50%
Debt, variable interest rate if leverage ratio met		2.00%
Term Loan Facility | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Debt principal amount				$ 275,000,000
Schedule principal payments						$ 1,400,000	$ 1,400,000
Effective interest rate						4.90%
Term Loan Facility | Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)	2.00%			2.75%		2.00%
Floor rate				0.75%		0.75%
Line of Credit | Amended and Restated Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility borrowing capacity				$ 75,000,000
Debt, variable interest rate (as a percent)						2.25%
Outstanding amount	$ 0				$ 0	$ 0
Facility fee, basis points						0.50%
Remaining outstanding						$ 73,600,000
Line of Credit | Industrial revenue bonds | Industrial Revenue Bonds
Debt Instrument [Line Items]
Line of credit facility borrowing capacity	$ 28,000,000				$ 28,000,000
Line of Credit | Industrial revenue bonds | Industrial Revenue Bonds | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt, variable interest rate (as a percent)						1.50%
Reduction in reate related to the tax-free interest income						20.00%

Debt - Future Minimum Principal

Debt - Future Minimum Principal Payments Due Under the Credit Agreements (Detail) $ in Thousands	Jun. 30, 2019USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
July 1, 2019 through December 31, 2019	$ 1,357
2020	5,326
2021	6,196
2022	6,196
2023	245,074
Thereafter	3,350
Total Payments	$ 267,499

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail) MMBTU in Millions	Mar. 29, 2018USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)MMBTU	Jun. 30, 2018USD ($)
Derivative [Line Items]
Derivatives, net liability position			$ (2,000,000)		$ (2,000,000)
Collateral posted with counterparties related to derivatives			0		$ 0
Natural Gas Swap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Aggregate notional amount outstanding (in mmBTUs) | MMBTU					3.6
Interest rate swap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Aggregate notional amount outstanding	$ 100,000,000	$ 100,000,000
Derivative instrument term (not beyond)		4 years
Average fixed rate (as a percent)	2.46%	1.323%
Proceeds from derivative hedges	$ 3,200,000
Unrealized gain amortized into interest expense			$ 200,000	$ 200,000	$ 500,000	$ 200,000
Interest rate swap | Cash Flow Hedging | Designated as Hedging Instrument | London Interbank Offered Rate (LIBOR)
Derivative [Line Items]
Floor rate (as a percent)	0.75%	0.75%

Derivative Instruments - Deriva

Derivative Instruments - Derivatives at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative asset	$ 0	$ 147
Derivative liability	1,996	105
Interest rate swap
Derivative [Line Items]
Derivative asset	0	86
Derivative liability	786	0
Commodity derivatives
Derivative [Line Items]
Derivative asset	0	61
Derivative liability	$ 1,210	$ 105

Derivative Instruments - Gains

Derivative Instruments - Gains (losses) on derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax	$ (1,391)	$ 494	$ (1,510)	$ 1,513
Gain/(loss) reclassified from AOCI into income (effective portion), net of tax	271	42	530	15
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax	(372)	297	(533)	1,268
Gain/(loss) reclassified from AOCI into income (effective portion), net of tax	292	139	595	209
Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in AOCI on derivatives (effective portion), net of tax	(1,019)	197	(977)	245
Gain/(loss) reclassified from AOCI into income (effective portion), net of tax	$ (21)	$ (97)	$ (65)	$ (194)

Leases - Components of Lease

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 100	$ 99	$ 201	$ 198
Short term lease cost	564	711	1,075	1,446
Total lease cost	$ 664	$ 810	$ 1,276	$ 1,644

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019USD ($)
Leases [Abstract]
July 1, 2019 through December 31, 2019	$ 311
2020	637
2021	600
2022	0
2023	0
Total lease payments	1,548
Less imputed interest	(85)
Present value of lease liabilities	$ 1,463

Leases - Details of Lease Term

Leases - Details of Lease Term and Discount Rate (Details)	Jun. 30, 2019
Leases [Abstract]
Weighted-average remaining lease term, operating leases	3 years
Weighted-average discount rate, operating leases	4.52%

Treasury Stock - Additional Inf

Treasury Stock - Additional Information (Detail) - USD ($)	Jun. 30, 2019	Feb. 21, 2018	Nov. 04, 2015
Equity [Abstract]
Stock repurchase program authorized amount (up to)		$ 300,000,000	$ 50,000,000
Stock repurchase program, remaining authorized amount	$ 111,000,000

Treasury Stock - Treasury Stock

Treasury Stock - Treasury Stock Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Treasury Stock [Roll Forward]
Beginning balance (shares)	9,262,253	9,070,346	7,319,417	6,788,817	9,070,346	6,788,817	6,788,817
Ending balance (shares)	9,851,553	9,262,253	7,664,325	7,319,417	9,851,553	7,664,325	9,070,346	6,788,817
Beginning balance	$ 214,055	$ 209,050	$ 157,907	$ 143,357	$ 209,050	$ 143,357	$ 143,357
Shares repurchased	15,018	5,005	10,012	14,550
Ending balance	$ 229,073	$ 214,055	$ 167,919	$ 157,907	$ 229,073	$ 167,919	$ 209,050	$ 143,357
Average share price (usd per share)		$ 23.11		$ 21.57	$ 23.25	$ 21.91	$ 23.05	$ 21.12
Repurchases on open market
Treasury Stock [Roll Forward]
Shares repurchased (shares)	589,300		344,908		781,207	875,508
Shares repurchased	$ 15,018		$ 10,012		$ 20,023	$ 24,562
Average share price (usd per share)	$ 25.48		$ 29.03		$ 25.63	$ 28.05

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Compensation expense	$ 0.6	$ 1	$ 1.1	$ 1.6
Unrecognized compensation expense	$ 5.6		$ 5.6
Unrecognized compensation expense, weighted average remaining period			2 years 7 months 6 days

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 327,747
Other comprehensive income/(loss) before reclassifications	(881)
Amounts reclassified from accumulated other comprehensive loss	(530)
Net current period other comprehensive income/(loss)	(1,411)
Ending Balance	335,788
Foreign currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,027)
Other comprehensive income/(loss) before reclassifications	629
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income/(loss)	629
Ending Balance	(4,398)
Net unrealized gain on derivatives, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1,636
Other comprehensive income/(loss) before reclassifications	(1,510)
Amounts reclassified from accumulated other comprehensive loss	(530)
Net current period other comprehensive income/(loss)	(2,040)
Ending Balance	(404)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,391)
Ending Balance	$ (4,802)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Detail)	12 Months Ended
	Dec. 31, 2019
Scenario, Forecast
Income Tax Contingency [Line Items]
Effective tax rate	22.50%

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive securities (in shares)	1,923		0		42,088	31,474
Net income	$ 12,848	$ 15,926	$ 21,895	$ 13,646	$ 28,774	$ 35,541
Weighted average number of shares outstanding- basic (shares)	34,804,588		36,879,774		35,025,208	37,154,750
Effect of dilutive securities:
Total effect of dilutive securities (shares)	65,937		148,223		83,957	160,197
Weighted average number of shares outstanding - diluted (shares)	34,870,525		37,027,997		35,109,165	37,314,947
Basic earnings per share (usd per share)	$ 0.37		$ 0.59		$ 0.82	$ 0.96
Diluted earnings per share (usd per share)	$ 0.37		$ 0.59		$ 0.82	$ 0.95
Restricted stock awards
Effect of dilutive securities:
Effect of dilutive securities (shares)	0		0		0	1,755
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (shares)	18,753		56,188		37,134	64,100
Performance-based restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (shares)	31,452		63,799		30,613	66,654
Stock options
Effect of dilutive securities:
Effect of dilutive securities (shares)	15,732		28,236		16,210	27,688

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Letter of Credit
Long-term Purchase Commitment [Line Items]
Outstanding amount of letters of credit	$ 1.4		$ 1.4		$ 1.4
Gas, Gypsum, Paper, and Other Raw Materials
Long-term Purchase Commitment [Line Items]
Non capital purchased under commitments	$ 19.5	$ 23.3	$ 41.4	$ 43.5

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments Due Under Non-Cancelable Operating Leases and Purchase Commitments by Year (Detail) $ in Thousands	Jun. 30, 2019USD ($)
As of June 30, 2019
July 1, 2019 through December 31, 2019	$ 20,311
2020	38,906
2021	36,591
2022	28,035
2023	12,254
Thereafter	48,144
Total	$ 184,241

Segment Reporting - Additional

Segment Reporting - Additional Information (Detail) - geographic_area	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Number of geographical areas (geographic area)	2		2
Wallboard | Sales Revenue, Net | Product Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	97.20%	97.40%	97.30%	97.10%

Segment Reporting - Segment Rep

Segment Reporting - Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Sales:
Net Sales	$ 124,206	$ 139,268	$ 246,238	$ 256,070
Operating Income:
Operating income	19,445	30,560	42,551	51,322
Adjustments:
Interest expense	(2,395)	(2,694)	(4,887)	(5,414)
Losses from equity investment	(367)	(391)	(412)	(755)
Other expense, net	(66)	(87)	(102)	(227)
Income before provision for income taxes	16,617	27,388	37,150	44,926
Depreciation and Amortization
Total depreciation and amortization	10,571	10,805	21,091	21,386
Operating Segments | Wallboard
Net Sales:
Net Sales	120,748	135,667	239,692	248,638
Operating Income:
Operating income	19,886	31,122	43,481	52,152
Depreciation and Amortization
Total depreciation and amortization	10,328	10,411	20,603	20,717
Operating Segments | Other
Net Sales:
Net Sales	3,458	3,601	6,546	7,432
Operating Income:
Operating income	(441)	(562)	(930)	(830)
Depreciation and Amortization
Total depreciation and amortization	243	394	488	669
Adjustments
Adjustments:
Interest expense	(2,395)	(2,694)	(4,887)	(5,414)
Losses from equity investment	(367)	(391)	(412)	(755)
Other expense, net	$ (66)	$ (87)	$ (102)	$ (227)

Segment Reporting - Net Sales b

Segment Reporting - Net Sales by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 124,206	$ 139,268	$ 246,238	$ 256,070
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	118,195	132,513	234,906	242,488
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 6,011	$ 6,755	$ 11,332	$ 13,582

Segment Reporting - Assets by G

Segment Reporting - Assets by Geographic Region (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	$ 284,413	$ 288,368
Total Assets	659,936	672,381
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	281,268	285,202
Total Assets	642,840	655,849
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Fixed Assets	3,145	3,166
Total Assets	$ 17,096	$ 16,532

Fair Value Disclosures (Details

Fair Value Disclosures (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 0	$ 147
Derivative liability	1,996	105
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	147
Derivative liability	1,996	105
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	147
Derivative liability	1,996	105
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	86
Derivative liability	786	0
Interest rate swap | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	86
Derivative liability	786	0
Interest rate swap | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Interest rate swap | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	86
Derivative liability	786	0
Interest rate swap | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	61
Derivative liability	1,210	105
Commodity derivatives | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	61
Derivative liability	1,210	105
Commodity derivatives | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	0	0
Commodity derivatives | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	61
Derivative liability	1,210	105
Commodity derivatives | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0
Derivative liability	$ 0	$ 0

Buchanan Plant Outage - Details

Buchanan Plant Outage - Details of Insurance Claims and Cash Payments Related to Buchanan Outage (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Gain from insurance recoveries, net	$ 0	$ 0	$ 1,513	$ 0
Business interruption
Loss Contingencies [Line Items]
Gain from insurance recoveries, net	3,200
Rebuild of property, plant and equipment damaged
Loss Contingencies [Line Items]
Gain from insurance recoveries, net			1,513
Claim Amount			1,839
Insurance Deductible			250
Net recovery recorded in six months ended June 30, 2019			1,589
Cash received in the six months ended June 30, 2019			1,589
Receivable Recorded as of June 30, 2019	0		0
Directs costs associated with business interruption
Loss Contingencies [Line Items]
Claim Amount			3,015
Insurance Deductible			0
Net recovery recorded in six months ended June 30, 2019			3,015
Cash received in the six months ended June 30, 2019			2,377
Receivable Recorded as of June 30, 2019	638		638
Total
Loss Contingencies [Line Items]
Claim Amount			4,854
Insurance Deductible			250
Net recovery recorded in six months ended June 30, 2019			4,604
Cash received in the six months ended June 30, 2019			3,966
Receivable Recorded as of June 30, 2019	$ 638		$ 638

Buchanan Plant Outage - Detai_2

Buchanan Plant Outage - Details of Gain from Insurance Recoveries, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Gain from insurance recoveries, net	$ 0	$ 0	$ 1,513	$ 0
Rebuild of property, plant and equipment damaged
Loss Contingencies [Line Items]
Cost to rebuild property, plant and equipment (capitalized)			1,839
Insurance deductible			250
Net recoveries from insurance policy			1,589
Write-off of property, plant and equipment			76
Gain from insurance recoveries, net			$ 1,513