10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                  to                     

Commission File Number: 001-14649

Trex Company, Inc.

(Exact name of registrant as specified in its charter)

Delaware	54-1910453
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
160 Exeter Drive Winchester, Virginia	22603-8605
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (540) 542-6300

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.:

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act):    Yes  ☐    No  ☒

The number of shares of the registrant’s common stock, par value $.01 per share, outstanding at October 17, 2017 was 29,424,889 shares.

TREX COMPANY, INC.

INDEX

	Page
PART I FINANCIAL INFORMATION		2
Item 1.    Financial Statements		2
Condensed Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)		2
Condensed Consolidated Balance Sheets as of September 30, 2017 (unaudited) and December 31, 2016		3
Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2017 and 2016 (unaudited)		4
Notes to Condensed Consolidated Financial Statements (unaudited)		5
Item 2.     Management’s Discussion and Analysis of Financial Condition and Results of Operations		17
Item 3.     Quantitative and Qualitative Disclosures About Market Risk		26
Item 4.    Controls and Procedures		26
PART II OTHER INFORMATION		27
Item 1.    Legal Proceedings		27
Item 2.     Unregistered Sales of Equity Securities and Use of Proceeds		27
Item 5.    Other Information		27
Item 6.    Exhibits		28

1

PART I

FINANCIAL INFORMATION

Item 1. Financial Statements

TREX COMPANY, INC.

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

(In thousands, except share and per share data)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Net sales	$	140,194	$	106,168	$	442,941	$	384,294
Cost of sales		84,910		76,223		250,473		235,312
Gross profit		55,284		29,945		192,468		148,982
Selling, general and administrative expenses		24,919		19,379		75,409		64,786
Income from operations		30,365		10,566		117,059		84,196
Interest expense, net		59		77		515		1,108
Income before income taxes		30,306		10,489		116,544		83,088
Provision for income taxes		10,208		2,702		39,715		27,871
Net income	$	20,098	$	7,787	$	76,829	$	55,217
Basic earnings per common share	$	0.68	$	0.27	$	2.61	$	1.88
Basic weighted average common shares outstanding		29,404,049		29,295,284		29,385,722		29,419,958
Diluted earnings per common share	$	0.68	$	0.26	$	2.60	$	1.86
Diluted weighted average common shares outstanding		29,578,216		29,516,718		29,563,497		29,635,796
Comprehensive income	$	20,098	$	7,787	$	76,829	$	55,217

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Condensed Consolidated Balance Sheets

(In thousands)

	September 30, 2017			December 31, 2016
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	25,541		$	18,664
Accounts receivable, net		70,802			48,039
Contract retainage		1,893			—
Inventories		26,029			28,546
Prepaid expenses and other assets		3,912			10,400
Revenues in excess of billings		4,706			—
Total current assets		132,883			105,649
Property, plant and equipment, net		102,788			103,286
Goodwill and other intangibles		72,544			10,523
Other assets		2,981			1,972
Total assets	$	311,196		$	221,430
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	15,960		$	10,767
Accrued expenses and other liabilities		41,327			34,693
Accrued warranty		6,725			5,925
Billings in excess of revenues		1,353			—
Customer deposits		953			—
Total current liabilities		66,318			51,385
Deferred income taxes		894			894
Non-current accrued warranty		29,733			31,767
Other long-term liabilities		2,676			3,223
Total liabilities		99,621			87,269
Commitments and contingencies		—			—
Stockholders’ equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding		—			—
Common stock, $0.01 par value, 80,000,000 shares authorized; 34,918,427 and 34,894,233 shares issued and 29,424,746 and 29,400,552 shares outstanding at September 30, 2017 and December 31, 2016, respectively		349			349
Additional paid-in capital		120,667			120,082
Retained earnings		264,071			187,242
Treasury stock, at cost, 5,493,681 shares at September 30, 2017 and December 31, 2016		(173,512	)		(173,512	)
Total stockholders’ equity		211,575			134,161
Total liabilities and stockholders’ equity	$	311,196		$	221,430

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(In thousands)

	Nine Months Ended September 30,
	2017			2016
Operating Activities
Net income	$	76,829		$	55,217
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		12,065			10,893
Stock-based compensation		3,913			3,806
Loss (gain) on disposal of property, plant and equipment		1,720			(189	)
Other non-cash adjustments		(405	)		(285	)
Changes in operating assets and liabilities:
Accounts receivable		(14,407	)		1,580
Contract retainage		55			—
Inventories		4,860			6,597
Prepaid expenses and other assets		2,987			(771	)
Revenues in excess of billings		(1,243	)		—
Accounts payable		1,203			(6,761	)
Accrued expenses and other liabilities		(1,430	)		5,005
Billings in excess of revenues		(399	)		—
Customer deposits		(609	)		—
Income taxes receivable/payable		7,698			8,487
Net cash provided by operating activities		92,837			83,579
Investing Activities
Expenditures for property, plant and equipment		(11,108	)		(8,534	)
Proceeds from sales of property, plant and equipment		—			4,349
Acquisition of business		(71,523	)		—
Net cash used in investing activities		(82,631	)		(4,185	)
Financing Activities
Borrowings under line of credit		201,000			242,700
Principal payments under line of credit		(201,000	)		(249,700	)
Repurchases of common stock		(3,617	)		(55,185	)
Financing costs		—			(485	)
Proceeds from employee stock purchase and option plans		288			218
Net cash used in financing activities		(3,329	)		(62,452	)
Net increase in cash and cash equivalents		6,877			16,942
Cash and cash equivalents, beginning of period		18,664			5,995
Cash and cash equivalents, end of period	$	25,541		$	22,937
Supplemental Disclosure:
Cash paid for interest	$	416		$	849
Cash paid for income taxes, net	$	32,016		$	19,435

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Notes to Condensed Consolidated Financial Statements

For the Nine Months Ended September 30, 2017 and 2016

(Unaudited)

1. BUSINESS AND ORGANIZATION

Trex Company, Inc. (Company) is the world’s largest manufacturer of wood-alternative decking and railing products, with more than 25 years of product experience which are marketed under the brand name Trex^®. The Company manufactures and distributes high-performance, low-maintenance wood/plastic composite outdoor living products and related accessories. A majority of its products are manufactured in a proprietary process that combines reclaimed wood fibers and scrap polyethylene. On July 31, 2017, through its newly-formed, wholly-owned subsidiary, Trex Commercial Products, Inc., the Company acquired certain assets and assumed certain liabilities of Staging Concepts Acquisition, LLC (SC Company) and thus expanded its markets to also become a market leader for the design, engineering and marketing of modular and architectural railing systems and solutions for the commercial and multifamily markets, and a leading provider of staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. Additional information on the acquisition of SC Company is presented in Note 6. The Company is incorporated in Delaware. The principal executive offices are located at 160 Exeter Drive, Winchester, Virginia 22603, and the telephone number at that address is (540) 542-6300. Subsequent to the acquisition, the Company operates in two reportable segments, Trex Residential Products and Trex Commercial Products.

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X, and accordingly, the accompanying condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal and recurring adjustments except as otherwise described herein) considered necessary for a fair presentation have been included in the accompanying condensed consolidated financial statements.

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary, Trex Wood-Polymer Espana, S.L, for all periods presented. The Condensed Consolidated Statements of Comprehensive Income and the Condensed Consolidated Statements of Cash Flows of the Company include the operations and cash flows of Trex Commercial Products, Inc., its newly-formed, wholly-owned subsidiary, from July 31, 2017 through September 30, 2017. The Company’s Condensed Consolidated Balance Sheet includes the assets and liabilities of Trex Commercial Products, Inc. at September 30, 2017. Trex Commercial Products, Inc. was formed to acquire certain assets and assume certain liabilities of SC Company on July 31, 2017. Additional information on the acquisition of SC Company is presented in Note 6.

The consolidated results of operations for the nine months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of December 31, 2016 and 2015 and for each of the three years in the period ended December 31, 2016 included in the Annual Report of Trex Company, Inc. on Form 10-K, as filed with the U.S. Securities and Exchange Commission.

3. SIGNIFICANT ACCOUNTING POLICIES

In addition to the critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, the Company’s critical accounting policies also currently include the following policies implemented subsequent to and in connection with the SC Company acquisition:

Revenue Recognition

For Trex Commercial Products, the Company recognizes revenue using the percentage of completion method measured by the ratio of direct costs incurred to date to estimated total costs for each contract. Contract costs include all direct material, labor, subcontract and certain indirect costs. Administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are recognized when such losses are determined. Changes in job performance, conditions and estimated profitability may result in revisions to costs and income and are recognized in the period they are determined. Revenues recognized in excess of amounts billed are classified under current assets. Billings in excess of revenues are classified under current liabilities.

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Concentrations and Credit Risk

In addition to its trade receivables, the Company assesses the credit risk exposure of its customers’ contracts receivable by considering the length of time receivables may be past due, the customer’s financial condition and ability to repay the obligation, historical and expected credit loss experience, and other factors. Contracts receivable are carried at the original invoice amount in accounts receivable in the Company’s Condensed Consolidated Balance Sheet and are generally due when billed, and contract retainage is generally due at the completion of the construction contract.

4. RECENTLY ADOPTED ACCOUNTING STANDARD

In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard amends certain aspects of accounting for employee share-based payment transactions, including the accounting for income taxes related to those transactions and forfeitures. The standard requires recognizing excess tax benefits and deficiencies on share-based awards in the tax provision instead of in equity. Also, the standard requires these amounts to be classified as an operating activity, and shares withheld to satisfy employee taxes to be classified as a financing activity in the statement of cash flows, rather than as currently classified as financing and operating activities, respectively. The standard was effective for annual reporting periods beginning after December 15, 2016 and interim periods within that reporting period, with early adoption permitted. The Company elected to early adopt the standard in fiscal year 2016. The impact of the early adoption resulted in the following:

• The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. Additionally, the standard requires that excess tax benefits are now reported as an operating activity in the Company’s Consolidated Statements of Cash Flows, rather than as a financing activity as was previously reported. The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the three and nine months ended September 30, 2016 have been adjusted, as follows:

	Three Months Ended September 30, 2016
	As Reported		Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	3,591	$	2,702
Net Income	$	6,898	$	7,787
Basic net income per share	$	0.24	$	0.27
Diluted net income per share	$	0.23	$	0.26
Diluted weighted average common shares outstanding		29,457,653		29,516,718

	Nine Months Ended September 30, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	29,510		$	27,871
Net Income	$	53,578		$	55,217
Basic net income per share	$	1.82		$	1.88
Diluted net income per share	$	1.81		$	1.86
Diluted weighted average common shares outstanding		29,581,578			29,635,796
Cash flows provided by operating activities	$	81,880		$	83,579
Cash flows used in financing activities	$	(60,573	)	$	(62,452	)

• The Company elected to change its policy on accounting for forfeitures and recognize forfeitures as they occur. The Company applied this guidance on a modified retrospective transition method. The Company determined that the cumulative effect of applying the guidance under the modified retrospective transition method was not material to its Consolidated Financial Statements.

6

• The standard requires the presentation of employee taxes as a financing activity in the Consolidated Statements of Cash Flows. This provision did not impact the Company’s Consolidated Financial Statements as the Company previously presented employee taxes as a financing activity in its Consolidated Statements of Cash Flows.

The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of diluted earnings per share for 2016, which did not materially increase the diluted weighted average common shares outstanding.

5. NEW ACCOUNTING STANDARDS NOT YET ADOPTED

In May 2017, the FASB issued ASU No. 2017-09, “Compensation—Stock Compensation (Topic 718), Scope Modification Accounting.” The guidance clarified when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value (or calculated intrinsic value, if those amounts are being used to measure the award under ASC 718), the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The guidance is effective prospectively for annual periods beginning on or after December 15, 2017. Early adoption is permitted. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test and eliminates the need to determine the fair value of individual assets and liabilities to measure goodwill impairment. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The guidance is to be applied prospectively, and is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed on testing dates after January 1, 2017. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” The guidance is intended to reduce diversity in practice across all industries in how certain transactions are classified in the statement of cash flows. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance requires application using a retrospective transition method. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” The standard requires lessees to recognize leases on the balance sheet as a right-of-use asset and a lease liability, other than leases that meet the definition of a short-term lease. The liability will be equal to the present value of the lease payments. The asset will be based on the liability, subject to adjustment. Currently, under existing U.S. generally accepted accounting standards, the Company does not recognize on the balance sheet a right-of-use asset or lease liability related to its operating leases. For income statement purposes, the leases will continue to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) and finance leases will result in a front-loaded expense pattern (similar to current capital leases). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The standard must be adopted using the modified retrospective transition method and provides for the option to elect a package of practical expedients upon adoption. The Company intends to adopt the standard in the first quarter of fiscal 2019 and is assessing the impact of adoption of the standard on its consolidated financial statements and related note disclosures. The Company has not made any decision on the option to elect adoption of the practical expedients.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” and issued subsequent amendments to the initial guidance in August 2015 within ASU No. 2015-14, in March 2016 within ASU No. 2016-08, in April 2016 within ASU No. 2016-10, in May 2016 within ASU No. 2016-12, and in December 2016 within ASU No. 2016-20 (collectively, the new standard). The new standard provides a single, comprehensive model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. The new standard requires an entity to recognize revenue when it satisfies a performance obligation at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring control of goods or services to a customer. The Company intends to adopt the new standard in the first quarter of fiscal 2018. Currently, the Company intends to use the retrospective application to each reporting period presented, with the option to elect certain practical expedients as defined in the new standard. The Company has substantially completed evaluation of its Trex Residential Products segment and believes that

7

adoption of the new standard will not have a significant impact on that segment. The Company continues to evaluate the impact of the new standard on its recently acquired Trex Commercial Products segment and expects to complete the evaluation during the fourth quarter of 2017. The Company expects expanded financial statement note disclosure. The Company continues to evaluate the impacts of the pending adoption. As such, the Company’s preliminary assessments are subject to change.

6. ACQUISITION

On July 31, 2017, through its newly-formed, wholly-owned subsidiary, Trex Commercial Products, the Company acquired certain assets and assumed certain liabilities of SC Company for $71.8 million in cash, subject to adjustment pending final determination of working capital at closing. The Company used cash on hand and $30.0 million of funding from its existing revolving credit facility, which was fully paid on August 17, 2017, to acquire the assets. The acquired business designs, engineers and markets modular architectural railing systems and solutions for the commercial and multifamily markets, and provides staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. As a result of the purchase, the Company gained access to growing commercial markets, expanded its custom design and engineering capabilities, and added the contract architect and specifier communities as new channels for its products.

The acquisition was accounted for using the acquisition method of accounting under U.S. Generally Accepted Accounting Principles, which requires, among other things, that the assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The fair values of consideration transferred and net assets acquired were determined using a combination of Level 2 and Level 3 inputs as specified in the fair value hierarchy in ASC 820, “Fair Value Measurements and Disclosures.” The Company believes that the fair values assigned to the assets acquired and liabilities assumed are based on reasonable assumptions. The Company’s consolidated results of operations for the quarterly and nine-month period ended September 30, 2017 include the operating results of the acquired business from the date of acquisition through quarter end. The Company’s consolidated balance sheet at September 30, 2017 includes the acquired assets and any liabilities assumed.

Based on the Company’s preliminary valuation, a total estimated consideration of $71.8 million has been allocated on a preliminary basis to the assets acquired and liabilities assumed, as follows (in thousands). A final determination of the purchase price and adjustment to the fair values of assets acquired and liabilities assumed and finalization of the valuation report will be completed upon the final determination of working capital at closing:

Accounts receivable, net	$	8,357
Contract retainage		1,948
Inventories, net		2,344
Prepaid expenses and other assets		1,223
Revenues in excess of billings		3,463
Fixed assets, net		1,264
Intangible assets		4,900
Goodwill		57,938
Accounts payable		(3,990	)
Accrued liabilities and other expenses		(2,329	)
Billings in excess of revenues		(1,752	)
Customer Deposits		(1,562	)
Total estimated consideration	$	71,804

8

The preliminary goodwill of $57.9 million is primarily attributable to the potential opportunity for the Company to offer full service railing systems in the growing commercial and multi-family markets, access to a complementary product category with a track record of substantial revenue growth, the ability to achieve economies of scale around raw material procurement, an increase in the range of products the Company may offer its core customers, and intangible assets that do not qualify for separable or legal criterion, such as an assembled workforce. The amount of goodwill that is expected to be amortized and deductible for tax purposes in 2017 is $1.1 million. All of the goodwill was recorded to the Trex Commercial Products reportable segment. The fair value attributed to intangible assets, which consists of production backlog and trade names and trademarks, is being amortized straight line over 12 months and is based on the estimated economics of the assets. The fair value attributed to the intangible assets acquired and goodwill was based on assumptions and other information compiled by management, including independent valuations that utilized established valuation techniques.

From July 31, 2017, through September 31, 2017, Trex Commercial Products generated $9.2 million of revenue and incurred a net loss of $75 thousand. The Company incurred $0.5 million of acquisition-related expenses during the nine months ended September 30, 2017, which are included in selling, general and administrative expense.

The following pro forma results are prepared for comparative purposes only and do not necessarily reflect the results that would have occurred had the acquisition occurred at the beginning of the years presented or the results which may occur in the future. The following unaudited pro forma results of operations assume the acquisition occurred on January 1, 2016 (in thousands, except per share amounts):

	Nine Months Ended September 30
	2017		2016		2017		2016
	Actual				Pro Forma
Net sales	$	442,941	$	384,294	$	475,076	$	427,043
Net income	$	76,829	$	55,217	$	77,570	$	54,978
Basic earnings per common share	$	2.61	$	1.88	$	2.64	$	1.87
Diluted earnings per common share	$	2.60	$	1.86	$	2.62	$	1.86

Significant pro forma adjustments included in the above pro forma information include an adjustment to amortization expense for the intangible assets acquired (see Note 9), elimination of transaction costs related to the acquisition as such costs are considered to be non-recurring in nature, an adjustment to compensation expense related to restricted stock units granted in connection with the acquisition, the income tax effects of the adjustments based on a blended statutory rate of 38.0%, and an adjustment to SC Company’s income taxes to the blended statutory rate, as SC Company was treated as a limited liability company for Federal and state income tax purposes.

7. INVENTORIES

Inventories valued at LIFO (last-in, first-out), consist of the following (in thousands):

	September 30, 2017			December 31, 2016
Finished goods	$	23,486		$	29,686
Raw materials		21,344			20,231
Total FIFO (first-in, first-out) inventories		44,830			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	23,459		$	28,546

The Company utilizes the LIFO method of accounting related to its wood-alternative decking and residential railing products, which generally provides for the matching of current costs with current revenues. However, under the LIFO method, reductions in annual inventory balances cause a portion of the Company’s cost of sales to be based on historical costs rather than current year costs (LIFO liquidation). Reductions in interim inventory balances expected to be replenished by year-end do not result in a LIFO liquidation. Accordingly, interim LIFO calculations are based, in part, on management’s estimates of expected year-end inventory levels and costs which may differ from actual results. Since inventory levels and costs are subject to factors beyond management’s control, interim results are subject to the final year-end LIFO inventory valuation. There were no LIFO inventory liquidations or related impact on cost of sales in the nine months ended September 30, 2017 or 2016.

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Inventories valued at lower of cost (FIFO method) and net realizable value consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Work-in-process	$	580	$	—
Raw materials		1,990		—
Total FIFO inventories	$	2,570	$	—

The Company utilizes the FIFO method of accounting related to its commercial railing and staging products. Work-in-process includes estimated production costs.

8. PREPAID EXPENSES AND OTHER ASSETS

Prepaid expenses and other assets consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Prepaid expenses	$	3,190	$	6,209
Income tax receivable		—		4,024
Other		722		167
Total prepaid expenses and other assets	$	3,912	$	10,400

9. GOODWILL AND OTHER INTANGIBLE ASSETS

The following table summarizes the activity related to the carrying amount of goodwill during the nine months ended September 30, 2017 (in thousands):

	2017
Beginning balance, January 1	$	10,523
Goodwill recognized from acquisition of SC Company		57,938
Ending balance, September 30	$	68,461

Intangible assets acquired from SC Company on July 31, 2017 consist of the following at September 30, 2017:

	Net Carrying Amount (in thousands)			Amortization Period
				(in months)
Intangible assets:
Customer backlog	$	4,000			12
Trade names and trademarks		900			12
Total intangible assets		4,900
Accumulated amortization:
Customer backlog		(683	)
Trade name		(134	)
Total accumulated amortization		(817	)
Intantible assets, net	$	4,083

Intangible asset amounts were determined based on the estimated economics of the asset and are amortized over the estimated useful lives on a straight-line bases, which approximates the pattern in which the economic benefits are expected to be received. Amortization expense for the quarterly period ended September 31, 2017 was $0.8 million.

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10. ACCRUED EXPENSES AND OTHER LIABILITIES

Accrued expenses and other liabilities consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Sales and marketing	$	21,013	$	16,707
Compensation and benefits		10,727		13,298
Income taxes		3,674		—
Manufacturing costs		1,215		1,799
Rent obligations		739		632
Other		3,959		2,257
Total accrued expenses and other liabilities	$	41,327	$	34,693

11. DEBT

The Company’s outstanding debt consists of a revolving credit facility.

Revolving Credit Facility

On January 12, 2016, the Company entered into a Third Amended and Restated Credit Agreement, as amended, with Bank of America, N.A. as Lender, Administrative Agent, Swing Line Lender and Letter of Credit Issuer, and certain other lenders including Citibank, N.A., Capital One, N.A., and SunTrust. The Third Amended Credit Agreement, as amended, provides the Company with one or more revolving loans in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021.

The Company had no outstanding borrowings under its revolving credit facility and remaining available borrowing capacity of $200 million at September 30, 2017.

Compliance with Debt Covenants and Restrictions

The Company’s ability to make scheduled principal and interest payments, borrow and repay amounts under any outstanding revolving credit facility and continue to comply with any loan covenants depends primarily on the Company’s ability to generate sufficient cash flow from operations.

As of September 30, 2017, the Company was in compliance with all of the covenants contained in its debt agreements. Failure to comply with the loan covenants might cause lenders to accelerate the repayment obligations under the credit facility, which may be declared payable immediately based on a default.

12. FINANCIAL INSTRUMENTS

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at September 30, 2017 and December 31, 2016.

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13. STOCKHOLDERS’ EQUITY

Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Numerator:
Net income available to common shareholders	$	20,098	$	7,787	$	76,829	$	55,217
Denominator:
Basic weighted average shares outstanding		29,404,049		29,295,284		29,385,722		29,419,958
Effect of dilutive securities:
Stock appreciation rights and options		97,315		116,803		98,905		133,907
Restricted stock		76,852		104,631		78,870		81,931
Diluted weighted average shares outstanding		29,578,216		29,516,718		29,563,497		29,635,796
Basic earnings per share	$	0.68	$	0.27	$	2.61	$	1.88
Diluted earnings per share	$	0.68	$	0.26	$	2.60	$	1.86

Diluted earnings per share is computed using the weighted average number of shares determined for the basic earnings per share computation plus the dilutive effect of common stock equivalents using the treasury stock method. The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights		17,957		—		14,156		6,174
Restricted stock		330		46		110		15

Stock Repurchase Programs

On October 22, 2015, the Board of Directors adopted a stock repurchase program of up to 3,150,000 shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company repurchased 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2,960,000 shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

14. STOCK-BASED COMPENSATION

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of September 30, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

The following table summarizes the Company’s stock-based compensation grants for the nine months ended September 30, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		36,105	$	72.50
Performance-based restricted stock units (a)		43,307	$	57.54
Stock appreciation rights		18,739	$	70.75

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(a) Includes 25,986 of target performance-based restricted stock unit awards granted during the nine months ended September 30, 2017, and adjustments of 1,071, 5,396 and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the nine months ended September 30, 2016. For SARs issued in the nine months ended September 30, 2017 the data and assumptions shown in the following table were used:

	Nine Months Ended September 30, 2017
Weighted-average fair value of grants	$	27.97
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42.2	%

The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights	$	28	$	—	$	220	$	184
Time-based restricted stock		417		368		1,557		1,847
Performance-based restricted stock		538		450		2,044		1,680
Employee stock purchase plan		54		43		92		95
Total stock-based compensation	$	1,037	$	861	$	3,913	$	3,806

Total unrecognized compensation cost related to unvested awards as of September 30, 2017 was $4.8 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

15. INCOME TAXES

The Company’s effective tax rate for the nine months ended September 30, 2017 and 2016 was 34.1% and 33.5%, respectively, which resulted in expense of $39.7 million and $27.9 million, respectively. The increase of 0.6% in the effective tax rate was primarily due to lower excess tax benefits in 2017 compared to 2016. In fiscal year 2016, the Company adopted FASB ASU No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The new standard requires excess tax benefits on share-based awards be recognized in the tax provision instead of in equity.

During the nine months ended September 30, 2017 and September 30, 2016, the Company realized $1.4 million and $1.7 million, respectively, of excess tax benefits from stock-based awards and recorded a corresponding benefit to income tax expense.

The Company analyzes its deferred tax assets each reporting period, considering all available positive and negative evidence in determining the expected realization of those deferred tax assets. As of September 30, 2017, the Company maintains a valuation allowance of $4.1 million against deferred tax assets primarily related to state tax credits it estimates will expire before they are realized.

The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of September 30, 2017, for certain tax jurisdictions tax years 2013 through 2016 remain subject to examination. Sales made to foreign distributors are not taxable in any foreign jurisdictions as the Company does not have a taxable presence in any foreign jurisdiction.

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16. SEGMENT INFORMATION

Prior to July 31, 2017, the Company operated in one reportable segment. Subsequent to the acquisition of certain assets and assumption of certain liabilities of SC Company on July 31, 2017, the Company operates in two reportable segments:

• Trex Residential Products manufactures wood-alternative decking and railing and related products marketed under the brand name Trex^®. The products are sold to its distributors and two national retailers who, in turn, sell primarily to the residential market, which includes replacement, remodeling and new construction related to outdoor living products.

• Trex Commercial Products designs, engineers, and markets modular and architectural railing systems and solutions for the commercial and multifamily markets, and staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. The segment’s products are sold through architects, specifiers, contractors, and others doing business within the segment’s commercial market.

The Company’s operating segments have been determined in accordance with its internal management structure, which is organized based on residential and commercial sales activities. The Company evaluates performance of each segment primarily based on net sales and earnings before interest, taxes, depreciation and amortization (EBITDA). The Company uses net sales to assess performance and allocate resources as this measure represents the amount of business the segment engaged in during a given period of time, is an indicator of market growth and acceptance of segment products, and represents the segment’s customers’ spending habits along with the amount of product the segment sells relative to its competitors. The Company uses EBITDA to assess performance and allocate resources because it believes that EBITDA facilitates performance comparison between the segments by eliminating interest, taxes, depreciation and amortization charges to income. The below segment data for the nine months ended September 30, 2017, includes data for Trex Residential Products for the nine-month period and data for Trex Commercial Products from the date of the acquisition of SC Company through September 30, 2017 (in thousands):

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	433,790	$	9,151		$	442,941
Net income (loss)	$	76,904	$	(75	)	$	76,829
EBITDA	$	128,221	$	806		$	129,027
Depreciation and amortization	$	11,087	$	881		$	11,968
Income tax expense	$	39,715	$	—		$	39,715
Capital expenditures	$	11,068	$	40		$	11,108
Total assets	$	232,663	$	78,533		$	311,196

Reconciliation of net income to EBITDA:

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	76,904	$	(75	)	$	76,829
Interest		515		—			515
Taxes		39,715		—			39,715
Depreciation and amortization		11,087		881			11,968
EBITDA	$	128,221	$	806		$	129,027
	Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	131,043	$	9,151		$	140,194
Net income (loss)	$	20,173	$	(75	)	$	20,098
EBITDA	$	34,079	$	806		$	34,885
Depreciation and amortization	$	3,639	$	881		$	4,520
Income tax expense	$	10,208	$	—		$	10,208
Capital expenditures	$	3,943	$	40		$	3,983
Total assets	$	232,663	$	78,533		$	311,196

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Reconciliation of net income to EBITDA:

	Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	20,173	$	(75	)	$	20,098
Interest		59		—			59
Taxes		10,208		—			10,208
Depreciation and amortization		3,639		881			4,520
EBITDA	$	34,079	$	806		$	34,885

17. SEASONALITY

The Company’s operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift demand for Trex products to a later period. As part of its normal business practice and consistent with industry practice, the Company has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of the Company’s product to meet anticipated seasonal consumer demand. The seasonal effects are often offset by the positive effect of the incentive programs.

18. COMMITMENTS AND CONTINGENCIES

Contract Termination Costs

The Company leases 55,047 square feet of office and storage space that it does not occupy, but has sublet all of the office space for the remainder of the term of its lease obligation, which ends June 30, 2019. The Company estimates that the future sublease receipts will be less than the remaining minimum lease payment obligations under its lease and has recorded a liability for the present value of the expected shortfall.

As of September 30, 2017, minimum payments remaining under the Company’s lease relating to its reconsidered corporate relocation over the years ending December 31, 2017, 2018, and 2019 are $0.5 million, $2.0 million and $1.0 million, respectively. Net minimum receipts remaining under the Company’s existing subleases over the years ending December 31, 2017, 2018 and 2019 are $0.3 million, $1.3 million and $0.7 million, respectively.

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(430	)		(536	)
Accretion of discount		78			113
Decrease in net estimated contract termination costs		(23	)		(85	)
Ending balance, September 30	$	1,100		$	1,598

Product Warranty

The Company warrants that its decking and residential railing products will be free from material defects in workmanship and materials for warranty periods ranging from 10 years to 25 years, depending on the product and its use. If there is a breach of such warranties, the Company has an obligation either to replace the defective product or refund the purchase price. The Company continues to receive and settle claims for products manufactured at its Nevada facility prior to 2007 that exhibit surface flaking and maintains a warranty reserve to provide for the settlement of these claims. Estimating the warranty reserve for surface flaking claims requires management to estimate (1) the number of claims to be settled with payment and (2) the average cost to settle each claim.

To estimate the number of claims to be settled with payment, the Company utilizes actuarial techniques to quantify both the expected number of claims to be received and the percentage of those claims that will ultimately require payment (collectively, elements). Estimates for these elements are quantified using a range of assumptions derived from claim count history and the identification of factors influencing the claim counts. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface

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defect and communications by the Company in 2013 informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured observable trends in historical claims activity. The cost per claim varies due to a number of factors, including the size of affected decks, the availability and type of replacement material used, the cost of production of replacement material and the method of claim settlement.

The Company monitors surface flaking claims activity each quarter for indications that its estimates require revision. Typically, a majority of surface flaking claims received in a year are received during the summer outdoor season, which spans the second and third quarters. It has been the Company’s practice to utilize the actuarial techniques discussed above during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. The number of claims received in the nine months ended September 30, 2017 was lower than claims received in the nine months ended September 30, 2016, continuing the historical year-over-year decline in incoming claims, and consistent with the Company’s expectations. The average settlement cost per claim experienced in the nine months ended September 30, 2017 was lower than the average settlement cost per claim experienced during the nine months ended September 30, 2016 and consistent with the Company’s expectations for 2017. The Company believes its reserve at September 30, 2017 is sufficient to cover future surface flaking obligations.

The Company’s analysis is based on currently known facts and a number of assumptions, as discussed above, and current expectations. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect the Company’s financial condition, results of operations or cash flows. The Company estimates that the annual number of claims received will continue to decline over time and that the average cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average cost per claim differs materially from expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flows in future periods. The Company estimates that a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims may result in approximately a $2.9 million change in the surface flaking warranty reserve.

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			9,835
Settlements made during the period		(4,425	)		(4,188	)
Ending balance, September 30	$	29,422		$	35,320

The remainder of the Company’s warranty reserve represents amounts accrued for non-surface flaking claims.

Legal Matters

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following management discussion should be read in conjunction with the Trex Company, Inc. (Company, we or our) Annual Report on Form 10-K for the year ended December 31, 2016 filed with the U.S. Securities and Exchange Commission (SEC) and the condensed consolidated financial statements and notes thereto included in Part I, Item 1. “Financial Statements” of this quarterly report.

NOTE ON FORWARD-LOOKING STATEMENTS

This management’s discussion and analysis contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements regarding our expected financial position and operating results, our business strategy, our financing plans, forecasted demographic and economic trends relating to our industry and similar matters are forward-looking statements. These statements can sometimes be identified by our use of forward-looking words such as “may,” “will,” “anticipate,” “estimate,” “expect,” “intend” or similar expressions. We cannot promise you that our expectations in such forward-looking statements will turn out to be correct. Our actual results could be materially different from our expectations because of various factors, including the factors discussed under “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2016 filed with the SEC. These statements are also subject to risks and uncertainties that could cause the Company’s actual operating results to differ materially. Such risks and uncertainties include, but are not limited to: the extent of market acceptance of the Company’s current and newly developed products; the costs associated with the development and launch of new products and the market acceptance of such new products; the sensitivity of the Company’s business to general economic conditions; the impact of seasonal and weather-related demand fluctuations on inventory levels in the distribution channel and sales of the Company’s products; the availability and cost of third-party transportation services for the Company’s products; the Company’s ability to obtain raw materials at acceptable prices; the Company’s ability to maintain product quality and product performance at an acceptable cost; the level of expenses associated with product replacement and consumer relations expenses related to product quality; and the highly competitive markets in which the Company operates.

OVERVIEW

Operations and Products: Trex Company, Inc. currently operates in two business segments: Trex Residential Products and Trex Commercial Products.

Trex Residential Products is the world’s largest manufacturer of high-performance composite decking and railing products, which are marketed under the brand name Trex^® and manufactured in the United States. We offer a comprehensive set of aesthetically appealing and durable, low-maintenance product offerings in the decking, railing, porch, fencing, trim, steel deck framing, and outdoor lighting categories. A majority of the products are eco-friendly and made in a proprietary process that combines reclaimed wood fibers and recycled polyethylene film. In addition to resisting fading and surface staining, Trex Residential products require no sanding and sealing, resist moisture damage, provide a splinter-free surface and do not require chemical treatment against rot or insect infestation. Combined, these aspects yield significant aesthetic advantages and lower maintenance than wood decking and railing and ultimately render Trex products less costly than wood over the life of the deck. Special characteristics (including resistance to splitting, the ability to bend, and ease and consistency of machining and finishing) facilitate installation, reduce contractor call-backs and afford consumers a wide range of design options. Trex Residential products are sold to distributors and two national retailers who, in turn, sell primarily to the residential market.

Trex Commercial Products is a leading national provider of custom-engineered railing systems and one of the leading suppliers of staging equipment. Trex Commercial Products designs and engineers custom railing solutions, which are prevalent in professional and collegiate sports facilities, standardized architectural and aluminum railing systems, which target commercial and high-rise applications, and portable staging equipment for the performing arts, sports, and event production and rental markets. With a team of devoted engineers, and industry-leading reputation for quality and dedication to customer service, Trex Commercial Products are sold through architects, specifiers, and contractors.

Trex Residential Products offers the following products:

Decking     Our principal decking products are Trex Transcend^®, Trex Enhance^® and Trex Select^®. Our eco-friendly composite decking products are comprised of a blend of 95 percent recycled wood and recycled plastic film and feature a protective polymer shell for enhanced protection against fading, staining, mold and scratching. We also offer Trex Hideaway^®, a hidden fastening system for grooved boards.  

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Railing	Our railing products are Trex Transcend Railing, Trex Select Railing, and Trex Signature® aluminum railing. Trex Transcend Railing is available in the colors of Trex Transcend decking and finishes that make it appropriate for use with Trex decking products as well as other decking materials, which we believe enhances the sales prospects of our railing products. Trex Select Railing is offered in a white finish and is ideal for consumers who desire a simple clean finished look for their deck. Trex Signature® aluminum railing is available in three colors and designed for consumers who want a sleek, contemporary look.
Porch	Our Trex Transcend Porch Flooring and Railing System is an integrated system of porch components and accessories.
Fencing	Our Trex Seclusions® fencing product is offered through two specialty distributors. This product consists of structural posts, bottom rail, pickets, top rail and decorative post caps.
Steel Deck Framing	Our triple-coated steel deck framing system called Trex Elevations® leverages the strength and dimensional stability of steel to create a flat surface for our decking. Trex Elevations provides consistency and reliability that wood does not and is fire resistant.
Outdoor Lighting	Our outdoor lighting systems are Trex DeckLighting™ and Trex LandscapeLighting™. Trex DeckLighting is a line of energy-efficient LED dimmable deck lighting, which is designed for use on posts, floors and steps. The line includes a post cap light, deck rail light, riser light and a recessed deck light. The Trex LandscapeLighting line includes an energy-efficient well light, path light, multifunction light and spotlight.

Trex Commercial Products offers the following products:

Architectural   Railing Systems	Our architectural railing systems are pre-engineered guardrails with options to accommodate styles ranging from classic and elegant wood top rail combined with sleek stainless components and glass infill, to modern and minimalist stainless cable and rod infill choices.
Aluminum Railing Systems	Our aluminum railings are a versatile, cost-effective and low-maintenance choice for a variety of interior and exterior applications that we believe blend form, function and style. They are often used in high-rise condominium and resort projects and offer safety and durability to stairs, public walkways and balconies. They are available in picket or glass infills with a selection of top cap styles, color finishes and mounting capabilities.
Custom Railing Options	Trex Commercial can design, engineer and manufacture custom railing systems tailored to the customer’s specific material, style and finish. Many railing styles are achievable, including glass, mesh, perforated railing and cable railing.
Portable Stage Platforms	Our advanced modular, lightweight custom staging systems include portable platforms, guardrails, stair units, barricades, camera platforms, VIP viewing decks, ADA infills, DJ booths, pool covers, and other custom applications. Our systems provide superior staging product solutions for facilities and venues with custom needs. Our equipment requires no tools, making it easy and efficient for set-up and take-down, and our staging products are designed to withstand the harshest of weather conditions. Our modular stages are designed to appear seamless, feel permanent, and maximize the functionality of the space.

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Highlights for the three months ended September 30, 2017:

◾ The acquisition of certain assets and the assumption of certain liabilities of Stadium Concepts Acquisition, LLC (SC Company) on July 31, 2017, by the Company’s newly-formed, wholly-owned subsidiary, Trex Commercial Products, Inc.

◾ Net sales of $140.2 million for the three months ended September 30, 2017, an increase of 32.0% over net sales of $106.2 million for the three months ended September 30, 2016.

◾ Gross profit as a percentage of net sales, gross margin, of 39.4% for the three months ended September 30, 2017, an increase of 11.2% over the gross margin of 28.2% for the three months ended September 30, 2016.

◾ Net income of $20.1 million for the three months ended September 30, 2017, or $0.68 per diluted share, compared to $7.8 million, or $0.26 per diluted share, for the same period in 2016.

Business Acquisition. On July 31, 2017, through our wholly-owned subsidiary, Trex Commercial Products, Inc., we entered into a definitive agreement with SC Company and on that date acquired certain assets and liabilities of SC Company for $71.8 million in cash. The purchase price is subject to adjustment pending final determination of working capital. We used cash on hand and $30.0 million from our existing revolving credit facility to acquire the business. The acquisition provides us with the opportunity to offer full service railing systems in the growing commercial and multi-family markets, access to a complementary product category with a track record of substantial revenue growth, the ability to achieve economies of scale around raw material procurement, and an increase in the range of products the Company may offer its core customers. The unaudited condensed consolidated financial statements include the accounts Trex Commercial Products from the date of acquisition through September 30, 2017.

Net Sales. Net sales consist of sales and freight, net of returns and discounts. The level of net sales is principally affected by sales volume and the prices paid for Trex products. Our branding and product differentiation strategy enables us to command premium prices. Our operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home and commercial improvement and residential and commercial construction and can shift demand for our products to a later period.

As part of our normal business practice and consistent with industry practices, we have historically provided our distributors and dealers of our Trex Residential Products incentives to build inventory levels before the start of the prime deck-building season to ensure adequate availability of our product to meet anticipated seasonal consumer demand and to enable production planning. These incentives include payment discounts and favorable payment terms. In addition, we offer price discounts or volume rebates on specified products and other incentives based on increases in purchases as part of specific promotional programs. The timing of sales incentive programs can significantly impact sales, receivables and inventory levels during the offering period. However, the timing and terms of the majority of our programs are generally consistent from year to year.

Gross Profit. Gross profit represents the difference between net sales and cost of sales. Cost of sales consists of raw materials costs, direct labor costs, manufacturing costs, subcontract costs and freight. Raw materials costs generally include the costs to purchase and transport reclaimed wood fiber, reclaimed polyethylene, pigmentation for coloring our products, and commodities used in the production of railing and staging. Direct labor costs include wages and benefits of personnel engaged in the manufacturing process. Manufacturing costs consist of costs of depreciation, utilities, maintenance supplies and repairs, indirect labor, including wages and benefits, and warehouse and equipment rental activities.

Product Warranty. We warrant that our Trex Residential products will be free from material defects in workmanship and materials for warranty periods ranging from 10 years to 25 years, depending on the product and its use. If there is a breach of such warranties, we have an obligation either to replace the defective product or refund the purchase price. We continue to receive and settle claims for products manufactured at our Nevada facility prior to 2007 that exhibit surface flaking and maintain a warranty reserve to provide for the settlement of these claims. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface defect and 2013 communications made by the Company informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured any observable trends in historical claims activity.

We monitor surface flaking claims activity each quarter for indications that our estimates require revision. Typically, a majority of surface flaking claims received in a fiscal year are received during the summer outdoor season, which spans the second and third fiscal quarters. It has been our practice to utilize actuarial techniques during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. Our actuarial analysis is based on currently known facts and a number of assumptions. Projecting future events such as the number of claims to be received, the

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number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect our financial condition, results of operations or cash flows. The number of claims received in the nine months ended September 30, 2017 was lower than the claims received in the nine months ended September 30, 2016, continuing the historical year-over-year decline in incoming claims, and consistent with our expectations. The average settlement cost per claim experienced in the nine months ended June 30, 2017 decreased compared to the average settlement cost per claim experienced during the nine months ended June 30, 2016, and was consistent with expectations for 2017. We believe that our reserve at September 30, 2017 is sufficient to cover future surface flaking obligations.

The following table details surface flaking claims activity related to our warranty:

	Nine Months Ended September 30,
	2017			2016
Claims open, beginning of period		2,755			2,500
Claims received (1)		1,931			2,257
Claims resolved (2)		(2,003	)		(1,774	)
Claims open, end of period		2,683			2,983
Average cost per claim (3)	$	2,553		$	2,670

(1) Claims received include new claims received or identified during the period.

(2) Claims resolved include all claims settled with or without payment and closed during the period.

(3) Average cost per claim represents the average settlement cost of claims closed with payment during the period.

Selling, General and Administrative Expenses. The largest component of selling, general and administrative expenses is personnel related costs, which include salaries, commissions, incentive compensation, and benefits of personnel engaged in sales and marketing, accounting, information technology, corporate operations, research and development, and other business functions. Another component of selling, general and administrative expenses is branding and other sales and marketing costs, which are used to build brand awareness. These costs consist primarily of advertising, merchandising, and other promotional costs. Other general and administrative expenses include professional fees, office occupancy costs attributable to the business functions previously referenced, and consumer relations expenses. As a percentage of net sales, selling, general and administrative expenses may vary from quarter to quarter due, in part, to the seasonality of our business.

RESULTS OF OPERATIONS

On July 31, 2017, Trex Commercial Products, our newly-formed, wholly-owned subsidiary, acquired certain assets and assumed certain liabilities of SC Company for $71.8 million in cash, subject to adjustment pending final determination of working capital at closing. The Company used cash on hand and $30.0 million of funding from its existing revolving credit facility to acquire the assets. The acquired business designs, engineers and markets modular architectural railing systems and solutions for the commercial and multifamily markets, and provides staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. As a result of the purchase, we will gain access to growing commercial markets, expand our custom design and engineering capabilities, and add the contract architect and specifier communities as new channels for its products. Our consolidated results of operations include the operating results of the acquired business following the date of acquisition. Our consolidated balance sheet at September 30, 2017 includes the acquired assets and any liabilities assumed.

Below is our discussion and analysis of our operating results and material changes in our operating results for the three months ended September 30, 2017 (2017 quarter) compared to the three months ended September 30, 2016 (2016 quarter), and for the nine months ended September 30, 2017 (2017 nine-month period) compared to the nine months ended September 30, 2016 (2016 nine-month period).

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Three Months Ended September 30, 2017 Compared To The Three Months September 30, 2016

Net Sales

	Three Months Ended September 30,				$ Change		% Change
	2017		2016
	(dollars in thousands)
Total net sales	$	140,194	$	106,168	$	34,026		32.0	%
Residential net sales	$	131,043	$	106,168	$	24,875		23.4	%
Commercial net sales	$	9,151		—	$	9,151		N/A

The 32.0% increase in net sales in the 2017 quarter compared to the 2016 quarter was due primarily to volume growth in our Trex branded decking and railing products. The volume growth was positively impacted by continued strength in the remodeling sector, our marketing programs aimed at taking market share from wood, and the healthy demand across our full suite of outdoor living products with decking and railing products as the major growth contributors. The remaining increase resulted from net sales of our recently acquired commercial products segment for the period from the date of acquisition of July 31, 2017 through quarter end.

Gross Profit

	Three Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Cost of sales	$	84,910		$	76,223		$	8,687		11.4	%
% of total net sales		60.6	%		71.8	%
Gross profit	$	55,284		$	29,945		$	25,339		84.6	%
Gross margin		39.4	%		28.2	%

Gross profit as a percentage of net sales, gross margin, increased to 39.4% in the 2017 quarter from 28.2% in the 2016 quarter, an improvement of 11.2%. Gross profit in the 2016 quarter included a $9.8 million increase to the warranty reserve related to surface flaking. Excluding this charge, the 2017 quarter gross margin increased by 2.0%, reflecting a 3.1% improvement in residential through cost reduction initiatives, lower sales of excess polyethylene film, lower cost raw materials and increased capacity utilization, partially offset by the gross margin contribution from commercial products.

Selling, General and Administrative Expenses

	Three Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Selling, general and administrative expenses	$	24,919		$	19,379		$	5,540		28.6	%
% of total net sales		17.8	%		18.3	%

The $5.5 million increase in selling, general and administrative expenses in the 2017 quarter compared to the 2016 quarter resulted primarily from an increase resulting from the SC Company acquisition and an increase in incentive compensation, and $1.2 million related to marketing, branding and advertising spend in support of our market growth strategies. As a percentage of net sales, total selling, general and administrative expenses decreased by 0.5% in the 2017 quarter compared to the 2016 quarter.

Provision for Income Taxes

	Three Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Provision for income taxes	$	10,208		$	2,702		$	7,506		278	%
Effective tax rate		33.7	%		25.8	%

The effective tax rate for the 2017 quarter increased by 7.9% compared to the effective tax rate for the 2016 quarter primarily due to the tax effects of higher excess tax benefits related to the settlement or vesting of restricted stock or restricted stock units recognized in income tax expense during the 2016 quarter compared to the 2017 quarter. In 2016, we adopted Financial Accounting Standards Board Accounting Standards Update No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. As a result of adoption of the standard, the provision for income taxes for the 2016 quarter was adjusted to $2.7 million from the $3.6 million previously reported.

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Net Income and Earnings Before Interest, Taxes, Depreciation and Amortization (EBITDA)¹ (in thousands)

Reconciliation of net income (GAAP) to EBITDA (non-GAAP):

Three Months Ended September 30	2017 Residential		2017 Commercial			2017 Total		2016 Total
Net income (loss)	$	20,173	$	(75	)	$	20,098	$	7,787
Interest		59		—			59		77
Taxes		10,208		—			10,208		2,702
Depreciation and amortization		3,639		881			4,520		3,444
EBITDA	$	34,079	$	806		$	34,885	$	14,010

	Three Months Ended September 30,				$ Change		% Change
	2017		2016
	(dollars in thousands)
Total EBITDA	$	34,885	$	14,010	$	20,875		149	%
Residential EBITDA	$	34,079	$	14,010	$	20,069		143	%
Commercial EBITDA	$	806		—	$	806		N/A

The Company uses EBITDA to assess performance as it believes EBITDA facilitates performance comparison between its reportable segments by eliminating interest, taxes, depreciation and amortization charges to income. Total EBITDA increased 149% to $34.9 million for the 2017 quarter compared to $14.0 million for the 2016 quarter. EBITDA in the 2016 quarter included a $9.8 million increase to warranty reserve related to surface flaking. Excluding this charge, the 2017 quarter increase in Total EBITDA was 46.5%, with Residential EBITDA growth of 43.1% and Commercial EBITDA contributing 3.4%. The 43.1% Residential EBITDA growth was driven by increased revenue and EBITDA margin expansion.

Nine Months Ended September 30, 2017 Compared To The Nine Months Ended September 30, 2016

Net Sales

	Nine Months Ended September 30,				$ Change		% Change
	2017		2016
	(dollars in thousands)
Total net sales	$	442,941	$	384,294	$	58,647		15.3	%
Residential net sales	$	433,790	$	384,294	$	49,496		12.9	%
Commercial net sales	$	9,151		—	$	9,151		N/A

The 15.3% increase in total net sales in the 2017 nine-month period compared to the 2016 nine-month period was primarily due to volume growth of our Trex branded decking and railing products. Volume growth was positively impacted by continued strength in the remodeling sector and the healthy demand across our full suite of outdoor living products, which we believe resulted from our marketing programs aimed at taking market share from wood. The increase in net sales from volume growth of our decking and railing products was offset by the ongoing reduction in the sale of recycled polyethylene film.

Gross Profit

	Nine Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Cost of sales	$	250,473		$	235,312		$	15,161		6.4	%
% of net sales		56.5	%		61.2	%

¹  EBITDA represents net income before interest, income taxes, depreciation and amortization. EBITDA is not a measurement of financial performance under accounting principles generally accepted in the United States (GAAP). We have included data with respect to EBITDA because management evaluates the performance of the business using several measures, including EBITDA. Management considers EBITDA to be an important supplemental indicator of our core operating performance because it eliminates interest, taxes, depreciation and amortization charges to net income or loss. For these reasons, management believes that EBITDA provides important supplemental information to investors regarding the operating performance of the Company. Total EBITDA may be considered a non-GAAP measure and should be considered in addition to, not as a substitute for, net income.

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Gross profit	$	192,468		$	148,982		$	43,486	29.2	%
Gross margin		43.5	%		38.8	%

Gross profit as a percentage of net sales, gross margin, increased to 43.5% in the 2017 nine-month period compared to 38.8% in the 2016 nine-month period, an improvement of 4.7%. Gross profit in the 2016 nine-month period included a $9.8 million increase to the warranty reserve related to surface flaking. Excluding this charge, the 2017 nine-month gross margin increased 2.2% reflecting a 2.6% improvement in residential through cost reduction initiatives, lower sales of excess polyethylene film, lower cost raw materials and increased capacity utilization, partially offset by the gross margin contribution from commercial products.

Selling, General and Administrative Expenses

	Nine Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Selling, general and administrative expenses	$	75,409		$	64,786		$	10,623		16.4	%
% of net sales		17.0	%		16.9	%

As a percentage of net sales, selling, general and administrative expenses increased minimally during the 2017 nine-month period compared to the 2016 nine-month period. The $10.6 million increase was primarily attributable to a $3.7 million increase in marketing, branding and advertising spend, a $1.5 million write off of research and development and other assets, $0.8 million increase in research and development as we continue to support growth, and an increase resulting from the SC Company acquisition.

Provision for Income Taxes

	Nine Months Ended September 30,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Provision for income taxes	$	39,715		$	27,871		$	11,844		42.5	%
Effective tax rate		34.1	%		33.5	%

The effective tax rate increased 0.6% during the 2017 nine-month period compared to the effective tax rate during the 2016 nine-month period primarily due to the effect of lower excess tax benefits in the 2017 nine-month period compared to the 2016 nine-month period.

Reconciliation of net income (GAAP) to EBITDA (non-GAAP):

Nine Months Ended September 30	2017 Residential		2017 Commercial			2017 Total		2016 Total
Net income (loss)	$	76,904	$	(75	)	$	76,829	$	55,217
Interest		515		—			515		1,108
Taxes		39,715		—			39,715		27,871
Depreciation and amortization		11,087		881			11,968		10,609
EBITDA	$	128,221	$	806		$	129,027	$	94,805

Net Income and Earnings Before Interest, Taxes, Depreciation and Amortization (EBITDA) (in thousands)

	Nine Months Ended September 30,				$ Change		% Change
	2017		2016
	(dollars in thousands)
Total EBITDA	$	129,027	$	94,805	$	34,222		36.1	%
Residential EBITDA	$	128,221	$	94,805	$	33,416		35.2	%
Commercial EBITDA	$	806	$	—	$	806		N/A

The Company uses EBITDA to assess performance as it believes EBITDA facilitates performance comparison between its reportable segments by eliminating interest, taxes, depreciation and amortization charges to income. Total EBITDA increased 36.1% to $129.0 million for the 2017 nine-month period compared to $94.8 million for the 2016 nine-month period. EBITDA in the 2016 nine-month period included a $9.8 million increase to warranty reserve related to surface flaking. Excluding this charge, the 2017 nine-month period increase in Total EBITDA was 23.3%, with Residential EBITDA growth of 22.5% and Commercial EBITDA contributing 0.8%. The 22.5% Residential EBITDA growth was driven by increased revenue and EBITDA margin expansion.

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LIQUIDITY AND CAPITAL RESOURCES

We finance operations and growth primarily with cash flows from operations, borrowings under our revolving credit facility, operating leases and normal trade credit terms from operating activities.

At September 30, 2017, we had $25.5 million of cash and cash equivalents.

Sources and Uses of Cash. The following table summarizes our cash flows from operating, investing and financing activities (in thousands):

	Nine Months Ended September 30,
	2017			2016
Net cash provided by operating activities	$	92,837		$	83,579
Net cash used in investing activities	$	(82,631	)	$	(4,185	)
Net cash used in financing activities	$	(3,329	)	$	(62,452	)
Net increase in cash and cash equivalents	$	6,877		$	16,942

Operating Activities

Net cash provided by operating activities was $92.8 million in the 2017 nine-month period compared to net cash provided by operating activities of $83.6 million in the 2016 nine-month period. The net increase in cash provided by operating activities in the 2017 nine-month period compared to the 2016 nine-month period was primarily due to an increase in working capital of $12.3 million. This increase was offset by a $21.6 million increase in net income.

Investing Activities

Capital expenditures in the 2017 nine-month period were $11.1 million, consisting primarily of $8.1 million for general plant cost reduction initiatives, and $2.2 million for equipment and new product development. Capital expenditures in the 2016 nine-month period were $8.5 million primarily consisting of $3.3 million for the purchase of equipment, land adjacent to our Winchester, Virginia manufacturing facility, and Trex University (our state-of-the-art training facility), $2.6 million for general plant cost reduction initiatives, and $2.3 million for process and productivity improvement. Also, in January 2016, the Company sold a portion of the Olive Branch, Mississippi, facility that contained the buildings for $4.2 million.

On July 31, 2017, through its newly-formed, wholly-owned subsidiary, Trex Commercial Products, the Company acquired certain assets and assumed certain liabilities of SC Company for $71.8 million in cash, subject to adjustment pending final determination of working capital at closing. The Company used cash on hand and $30 million of funding from its existing revolving credit facility to acquire the assets.

Financing Activities

Net cash used in financing activities was $3.3 million in the 2017 nine-month period compared to net cash used in financing activities of $62.5 million in the 2016 nine-month period. The $59.1 million decrease was primarily due to $54.7 million in stock repurchase activity in the 2016 nine-month period.

Stock Repurchase Programs.

On October 22, 2015, the Board of Directors adopted a new stock repurchase program of up to 3.15 million shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company repurchased a total of 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2.96 million shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

Indebtedness. Our Third Amended and Restated Credit Agreement, as amended, provides us with revolving loan capacity in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021. At September 30, 2017, we had no outstanding indebtedness under the revolving credit facility and borrowing capacity under the facility of $200 million.

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Debt Covenants. To remain in compliance with covenants contained within our debt agreements, we must maintain specified financial ratios based on levels of debt, fixed charges, and earnings (excluding extraordinary gains and extraordinary non-cash losses) before interest, taxes, depreciation and amortization. At September 30, 2017, we were in compliance with these covenants. Failure to comply with our loan covenants might cause our lenders to accelerate our repayment obligations under our credit facility, which may be declared payable immediately based on a default.

We believe that cash on hand, cash from operations and borrowings expected to be available under our revolving credit facility will provide sufficient funds to fund planned capital expenditures, make scheduled principal and interest payments, fund warranty payments, and meet other cash requirements. We currently expect to fund future capital expenditures from operations and financing activities. The actual amount and timing of future capital requirements may differ materially from our estimate depending on the demand for Trex products and new market developments and opportunities.

Capital Requirements. We currently estimate that our capital expenditures in 2017 will be $15 to $20 million. Our capital allocation priorities include expenditures for internal growth opportunities, manufacturing cost reductions, acquisitions which fit out long-term outdoor products growth strategy as we continue to evaluate opportunities that would be a good strategic fit for Trex, and return of capital to shareholders.

Inventory in Distribution Channels. We sell our decking and residential railing products through a tiered distribution system. We have over 50 distributors worldwide and two national retail merchandisers to which we sell our products. The distributors in turn sell the products to dealers and retail locations who in turn sell the products to end users. Significant increases in inventory levels in the distribution channel without a corresponding change in end-use demand could have an adverse effect on future sales. We cannot definitively determine the level of inventory in the distribution channels at any time. We are not aware of significant changes in the levels of inventory in the distribution channels at September 30, 2017 compared to inventory levels at September 30, 2016.

Product Warranty. We continue to receive and settle claims related to products manufactured at our Nevada facility prior to 2007 that exhibit surface flaking, which has had a material adverse effect on cash flow from operations, and regularly monitor the adequacy of the warranty reserve.

In the 2017 nine-month period and the 2016 nine-month period we paid $4.4 million and $4.2 million, respectively, to settle surface flaking claims. We estimate that the number of claims received will continue to decline over time and that the average settlement cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average settlement cost per claim differs materially from our expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flow in future periods.

Business Acquisition. On July 31, 2017, through our wholly-owned subsidiary, Trex Commercial Products, Inc., we entered into a definitive agreement with SC Company and on that date acquired certain assets and liabilities of SC Company for $71.8 million in cash. The purchase price is subject to adjustment pending final determination of working capital. We used cash on hand and $30.0 million from our existing revolving credit facility to acquire the business.

Seasonality. Our operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift demand for our products to a later period. As part of our normal business practice and consistent with industry practice, we have historically offered incentive programs to our distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of our product to meet anticipated seasonal consumer demand. The seasonal effects are often offset by the positive effect of the incentive programs.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

In addition to the critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, critical accounting policies and estimates also include the following policies subsequent to and in connection with the SC Company acquisition:

Revenue Recognition

We recognize revenue using the percentage of completion method measured by the ratio of direct costs incurred to date to estimated total costs for each contract. Contract costs include all direct material, labor, subcontract and certain indirect costs. Administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are recognized when such losses are determined. Changes in job performance, conditions and estimated profitability may result

25

in revisions to costs and income and are recognized in the period they are determined. Revenues recognized in excess of amounts billed are classified under current assets as costs and estimated earnings in excess of billings. Billings in excess of revenues are classified under current liabilities as billings in excess of costs and estimated earnings.

Goodwill

The Company evaluates the recoverability of goodwill in accordance with Accounting Standard Codification Topic 350, “Intangibles – Goodwill and Other,” annually or more frequently if an event occurs or circumstances change in the interim that would more likely than not reduce the fair value of the asset below its carrying amount. Goodwill is considered to be impaired when the net book value of the reporting unit exceeds its estimated fair value. The Company first assesses qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is less than its carrying amount to determine if it should proceed with the evaluation of goodwill for impairment. If the Company proceeds with the two-step impairment test, the Company first compares the fair value of the reporting unit to its carrying value. If the carrying value of a reporting unit exceeds its fair value, the goodwill of that reporting unit is potentially impaired and step two of the impairment analysis is performed. In step two of the analysis, an impairment loss is recorded equal to the excess of the carrying value of the reporting unit’s goodwill over its implied fair value should such a circumstance arise. The Company measures fair value of the reporting unit based on a present value of future discounted cash flows and a market valuation approach.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

For information regarding our exposure to certain market risks, see “Quantitative and Qualitative Disclosures about Market Risk,” in Part II, Item 7A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. There were no material changes to the Company’s market risk exposure during the nine months ended September 30, 2017.

Item 4. Controls and Procedures

The Company’s management, with the participation of its President and Chief Executive Officer, who is the Company’s principal executive officer, and its Vice President and Chief Financial Officer, who is the Company’s principal financial officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures as of September 30, 2017. We have excluded Trex Commercial Products, Inc., our wholly-owned subsidiary which is included in our consolidated financial statements, from our assessment of internal control over financial reporting as of September 30, 2017, because it was formed to acquire certain assets and assume certain liabilities of Staging Concepts Acquisition, LLC and Stadium Consolidation, LLC in a business combination on July 31, 2017. Based on this evaluation, the President and Chief Executive Officer and the Vice President and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures are effective. In addition, there have been no changes in the Company’s internal control over financial reporting during the nine-month period ended September 30, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1. Legal Proceedings

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(c) The following table provides information relating to the purchases of our common stock during the quarter ended September 30, 2017 in accordance with Item 703 of Regulation S-K:

Period	(a) Total Number of Shares (or Units) Purchased (1)		(b) Average Price Paid per Share (or Unit) ($)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum number of Shares (or Units) that May Yet Be Purchased Under the Plan or Program
July 1, 2017 – July 31, 2017		—		—	Not applicable	Not applicable
August 1, 2017 – August 31, 2017		918	$	73.76	Not applicable	Not applicable
September 1, 2017 – September 30, 2017		—		—	Not applicable	Not applicable
Quarter ended September 30, 2017		918			Not applicable

(1) Shares withheld by, or delivered to, the Company pursuant to provisions in agreements with recipients of restricted stock granted under the Company’s 2014 Stock Incentive Plan allowing the Company to withhold, or the recipient to deliver to the Company, the number of shares having the fair value equal to tax withholding due.

Item 5. Other Information

N/A

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Item 6. Exhibits

The number and description of the following exhibits coincide with Item 601 of Regulation S-K:

2.1	Asset Purchase Agreement by and among Trex Commercial Products, Inc., Staging Concepts Acquisition, LLC, and Stadium Consolidation, LLC. Filed as Exhibit 2.1 to the Company’s Current Report on Form 8-K filed July 31, 2017 and incorporated herein by reference.
3.1	Restated Certificate of Incorporation of Trex Company, Inc. (Company). Filed as Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (No. 333-63287) and incorporated herein by reference.
3.2	Certificate of Amendment to the Restated Certificate of Incorporation of Trex Company, Inc. dated April  30, 2014. Filed as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014 and incorporated herein by reference.
3.3	Amended and Restated By-Laws of the Company. Filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed May 7, 2008 and incorporated herein by reference.
31.1	Certification of Chief Executive Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
31.2	Certification of Chief Financial Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
32	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350). Furnished herewith.
101.INS	XBRL Instance Document. Filed.
101.SCH	XBRL Taxonomy Extension Schema Document. Filed.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document. Filed.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document. Filed.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document. Filed.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document. Filed.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	TREX COMPANY, INC.
Date: October 30, 2017	By:	/s/ Bryan H. Fairbanks
		Bryan H. Fairbanks
		Vice President and Chief Financial Officer
		(Duly Authorized Officer and Principal Financial Officer)

EXHIBIT INDEX

Exhibit   Number	Exhibit Description
2.1	Asset Purchase Agreement by and among Trex Commercial Products, Inc., Staging Concepts Acquisition, LLC, and Stadium Consolidation, LLC. Filed as Exhibit 2.1 to the Company’s Current Report on Form 8-K filed July 31, 2017 and incorporated herein by reference.
3.1	Restated Certificate of Incorporation of Trex Company, Inc. (Company). Filed as Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (No. 333-63287) and incorporated herein by reference.
3.2	Certificate of Amendment to the Restated Certificate of Incorporation of Trex Company, Inc. dated April  30, 2014. Filed as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014 and incorporated herein by reference.
3.3	Amended and Restated By-Laws of the Company. Filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed May 7, 2008 and incorporated herein by reference.
31.1	Certification of Chief Executive Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
31.2	Certification of Chief Financial Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
32	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350). Furnished herewith.
101.INS	XBRL Instance Document. Filed.
101.SCH	XBRL Taxonomy Extension Schema Document. Filed.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document. Filed.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document. Filed.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document. Filed.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document. Filed.

EX-31.1

Exhibit 31.1

CERTIFICATION

I, James E. Cline, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Trex Company, Inc.;

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

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

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

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

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

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

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

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

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

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

Date: October 30, 2017

/s/ James E. Cline

James E. Cline

President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Bryan H. Fairbanks, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Trex Company, Inc.;

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

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

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

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

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

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

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

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

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

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

Date: October 30, 2017

/s/ Bryan H. Fairbanks

Bryan H. Fairbanks

Vice President and Chief Financial Officer

(Principal Financial Officer)

EX-32

Exhibit 32

Certifications of Chief Executive Officer and Chief Financial Officer

Pursuant to Section 906

of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the President and Chief Executive Officer and the Vice President and Chief Financial Officer of Trex Company, Inc. (the “Company”), each hereby certifies that, on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended September 30, 2017 filed on the date hereof with the U.S. Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

Date: October 30, 2017	/s/ James E. Cline
	James E. Cline
	President and Chief Executive Officer
Date: October 30, 2017	/s/ Bryan H. Fairbanks
	Bryan H. Fairbanks
	Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 17, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	TREX
Entity Registrant Name	TREX CO INC
Entity Central Index Key	0001069878
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		29,424,889

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 140,194	$ 106,168	$ 442,941	$ 384,294
Cost of sales	84,910	76,223	250,473	235,312
Gross profit	55,284	29,945	192,468	148,982
Selling, general and administrative expenses	24,919	19,379	75,409	64,786
Income from operations	30,365	10,566	117,059	84,196
Interest expense, net	59	77	515	1,108
Income before income taxes	30,306	10,489	116,544	83,088
Provision for income taxes	10,208	2,702	39,715	27,871
Net income	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Basic earnings per common share	$ 0.68	$ 0.27	$ 2.61	$ 1.88
Basic weighted average common shares outstanding	29,404,049	29,295,284	29,385,722	29,419,958
Diluted earnings per common share	$ 0.68	$ 0.26	$ 2.60	$ 1.86
Diluted weighted average common shares outstanding	29,578,216	29,516,718	29,563,497	29,635,796
Comprehensive income	$ 20,098	$ 7,787	$ 76,829	$ 55,217

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 25,541	$ 18,664
Accounts receivable, net	70,802	48,039
Contract retainage	1,893
Inventories	26,029	28,546
Prepaid expenses and other assets	3,912	10,400
Revenues in excess of billings	4,706
Total current assets	132,883	105,649
Property, plant and equipment, net	102,788	103,286
Goodwill and other intangibles	72,544	10,523
Other assets	2,981	1,972
Total assets	311,196	221,430
Current liabilities:
Accounts payable	15,960	10,767
Accrued expenses and other liabilities	41,327	34,693
Accrued warranty	6,725	5,925
Billings in excess of revenues	1,353
Customer deposits	953
Total current liabilities	66,318	51,385
Deferred income taxes	894	894
Non-current accrued warranty	29,733	31,767
Other long-term liabilities	2,676	3,223
Total liabilities	99,621	87,269
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 80,000,000 shares authorized; 34,918,427 and 34,894,233 shares issued and 29,424,746 and 29,400,552 shares outstanding at September 30, 2017 and December 31, 2016, respectively	349	349
Additional paid-in capital	120,667	120,082
Retained earnings	264,071	187,242
Treasury stock, at cost, 5,493,681 shares at September 30, 2017 and December 31, 2016	(173,512)	(173,512)
Total stockholders' equity	211,575	134,161
Total liabilities and stockholders' equity	$ 311,196	$ 221,430

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	34,918,427	34,894,233
Common stock, shares outstanding	29,424,746	29,400,552
Treasury stock, shares	5,493,681	5,493,681

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income	$ 76,829	$ 55,217
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,065	10,893
Stock-based compensation	3,913	3,806
Loss (gain) on disposal of property, plant and equipment	1,720	(189)
Other non-cash adjustments	(405)	(285)
Changes in operating assets and liabilities:
Accounts receivable	(14,407)	1,580
Contract retainage	55
Inventories	4,860	6,597
Prepaid expenses and other assets	2,987	(771)
Revenues in excess of billings	(1,243)
Accounts payable	1,203	(6,761)
Accrued expenses and other liabilities	(1,430)	5,005
Billings in excess of revenues	(399)
Customer deposits	(609)
Income taxes receivable/payable	7,698	8,487
Net cash provided by operating activities	92,837	83,579
Investing Activities
Expenditures for property, plant and equipment	(11,108)	(8,534)
Proceeds from sales of property, plant and equipment		4,349
Acquisition of business	(71,523)
Net cash used in investing activities	(82,631)	(4,185)
Financing Activities
Borrowings under line of credit	201,000	242,700
Principal payments under line of credit	(201,000)	(249,700)
Repurchases of common stock	(3,617)	(55,185)
Financing costs		(485)
Proceeds from employee stock purchase and option plans	288	218
Net cash used in financing activities	(3,329)	(62,452)
Net increase in cash and cash equivalents	6,877	16,942
Cash and cash equivalents, beginning of period	18,664	5,995
Cash and cash equivalents, end of period	25,541	22,937
Supplemental Disclosure:
Cash paid for interest	416	849
Cash paid for income taxes, net	$ 32,016	$ 19,435

XML

Business and Organization

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business and Organization

1. BUSINESS AND ORGANIZATION

Trex Company, Inc. (Company) is the world’s largest manufacturer of wood-alternative decking and railing products, with more than 25 years of product experience which are marketed under the brand name Trex^®. The Company manufactures and distributes high-performance, low-maintenance wood/plastic composite outdoor living products and related accessories. A majority of its products are manufactured in a proprietary process that combines reclaimed wood fibers and scrap polyethylene. On July 31, 2017, through its newly-formed, wholly-owned subsidiary, Trex Commercial Products, Inc., the Company acquired certain assets and assumed certain liabilities of Staging Concepts Acquisition, LLC (SC Company) and thus expanded its markets to also become a market leader for the design, engineering and marketing of modular and architectural railing systems and solutions for the commercial and multifamily markets, and a leading provider of staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. Additional information on the acquisition of SC Company is presented in Note 6. The Company is incorporated in Delaware. The principal executive offices are located at 160 Exeter Drive, Winchester, Virginia 22603, and the telephone number at that address is (540) 542-6300. Subsequent to the acquisition, the Company operates in two reportable segments, Trex Residential Products and Trex Commercial Products.

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Basis of Presentation

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X, and accordingly, the accompanying condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal and recurring adjustments except as otherwise described herein) considered necessary for a fair presentation have been included in the accompanying condensed consolidated financial statements.

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary, Trex Wood-Polymer Espana, S.L, for all periods presented. The Condensed Consolidated Statements of Comprehensive Income and the Condensed Consolidated Statements of Cash Flows of the Company include the operations and cash flows of Trex Commercial Products, Inc., its newly-formed, wholly-owned subsidiary, from July 31, 2017 through September 30, 2017. The Company’s Condensed Consolidated Balance Sheet includes the assets and liabilities of Trex Commercial Products, Inc. at September 30, 2017. Trex Commercial Products, Inc. was formed to acquire certain assets and assume certain liabilities of SC Company on July 31, 2017. Additional information on the acquisition of SC Company is presented in Note 6.

The consolidated results of operations for the nine months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of December 31, 2016 and 2015 and for each of the three years in the period ended December 31, 2016 included in the Annual Report of Trex Company, Inc. on Form 10-K, as filed with the U.S. Securities and Exchange Commission.

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Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Significant Accounting Policies

3. SIGNIFICANT ACCOUNTING POLICIES

In addition to the critical accounting policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, the Company’s critical accounting policies also currently include the following policies implemented subsequent to and in connection with the SC Company acquisition:

Revenue Recognition

For Trex Commercial Products, the Company recognizes revenue using the percentage of completion method measured by the ratio of direct costs incurred to date to estimated total costs for each contract. Contract costs include all direct material, labor, subcontract and certain indirect costs. Administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are recognized when such losses are determined. Changes in job performance, conditions and estimated profitability may result in revisions to costs and income and are recognized in the period they are determined. Revenues recognized in excess of amounts billed are classified under current assets. Billings in excess of revenues are classified under current liabilities.

Concentrations and Credit Risk

In addition to its trade receivables, the Company assesses the credit risk exposure of its customers’ contracts receivable by considering the length of time receivables may be past due, the customer’s financial condition and ability to repay the obligation, historical and expected credit loss experience, and other factors. Contracts receivable are carried at the original invoice amount in accounts receivable in the Company’s Condensed Consolidated Balance Sheet and are generally due when billed, and contract retainage is generally due at the completion of the construction contract.

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Recently Adopted Accounting Standard

9 Months Ended

Sep. 30, 2017

Accounting Changes and Error Corrections [Abstract]

Recently Adopted Accounting Standard

4. RECENTLY ADOPTED ACCOUNTING STANDARD

In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard amends certain aspects of accounting for employee share-based payment transactions, including the accounting for income taxes related to those transactions and forfeitures. The standard requires recognizing excess tax benefits and deficiencies on share-based awards in the tax provision instead of in equity. Also, the standard requires these amounts to be classified as an operating activity, and shares withheld to satisfy employee taxes to be classified as a financing activity in the statement of cash flows, rather than as currently classified as financing and operating activities, respectively. The standard was effective for annual reporting periods beginning after December 15, 2016 and interim periods within that reporting period, with early adoption permitted. The Company elected to early adopt the standard in fiscal year 2016. The impact of the early adoption resulted in the following:

• The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. Additionally, the standard requires that excess tax benefits are now reported as an operating activity in the Company’s Consolidated Statements of Cash Flows, rather than as a financing activity as was previously reported. The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the three and nine months ended September 30, 2016 have been adjusted, as follows:

	Three Months Ended September 30, 2016
	As Reported		Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	3,591	$	2,702
Net Income	$	6,898	$	7,787
Basic net income per share	$	0.24	$	0.27
Diluted net income per share	$	0.23	$	0.26
Diluted weighted average common shares outstanding		29,457,653		29,516,718

	Nine Months Ended September 30, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	29,510		$	27,871
Net Income	$	53,578		$	55,217
Basic net income per share	$	1.82		$	1.88
Diluted net income per share	$	1.81		$	1.86
Diluted weighted average common shares outstanding		29,581,578			29,635,796
Cash flows provided by operating activities	$	81,880		$	83,579
Cash flows used in financing activities	$	(60,573	)	$	(62,452	)

• The Company elected to change its policy on accounting for forfeitures and recognize forfeitures as they occur. The Company applied this guidance on a modified retrospective transition method. The Company determined that the cumulative effect of applying the guidance under the modified retrospective transition method was not material to its Consolidated Financial Statements.

• The standard requires the presentation of employee taxes as a financing activity in the Consolidated Statements of Cash Flows. This provision did not impact the Company’s Consolidated Financial Statements as the Company previously presented employee taxes as a financing activity in its Consolidated Statements of Cash Flows.

The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of diluted earnings per share for 2016, which did not materially increase the diluted weighted average common shares outstanding.

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New Accounting Standards Not Yet Adopted

9 Months Ended

Sep. 30, 2017

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards Not Yet Adopted

5. NEW ACCOUNTING STANDARDS NOT YET ADOPTED

In May 2017, the FASB issued ASU No. 2017-09, “Compensation—Stock Compensation (Topic 718), Scope Modification Accounting.” The guidance clarified when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value (or calculated intrinsic value, if those amounts are being used to measure the award under ASC 718), the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The guidance is effective prospectively for annual periods beginning on or after December 15, 2017. Early adoption is permitted. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test and eliminates the need to determine the fair value of individual assets and liabilities to measure goodwill impairment. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The guidance is to be applied prospectively, and is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed on testing dates after January 1, 2017. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” The guidance is intended to reduce diversity in practice across all industries in how certain transactions are classified in the statement of cash flows. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance requires application using a retrospective transition method. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” The standard requires lessees to recognize leases on the balance sheet as a right-of-use asset and a lease liability, other than leases that meet the definition of a short-term lease. The liability will be equal to the present value of the lease payments. The asset will be based on the liability, subject to adjustment. Currently, under existing U.S. generally accepted accounting standards, the Company does not recognize on the balance sheet a right-of-use asset or lease liability related to its operating leases. For income statement purposes, the leases will continue to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) and finance leases will result in a front-loaded expense pattern (similar to current capital leases). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The standard must be adopted using the modified retrospective transition method and provides for the option to elect a package of practical expedients upon adoption. The Company intends to adopt the standard in the first quarter of fiscal 2019 and is assessing the impact of adoption of the standard on its consolidated financial statements and related note disclosures. The Company has not made any decision on the option to elect adoption of the practical expedients.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” and issued subsequent amendments to the initial guidance in August 2015 within ASU No. 2015-14, in March 2016 within ASU No. 2016-08, in April 2016 within ASU No. 2016-10, in May 2016 within ASU No. 2016-12, and in December 2016 within ASU No. 2016-20 (collectively, the new standard). The new standard provides a single, comprehensive model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. The new standard requires an entity to recognize revenue when it satisfies a performance obligation at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring control of goods or services to a customer. The Company intends to adopt the new standard in the first quarter of fiscal 2018. Currently, the Company intends to use the retrospective application to each reporting period presented, with the option to elect certain practical expedients as defined in the new standard. The Company has substantially completed evaluation of its Trex Residential Products segment and believes that adoption of the new standard will not have a significant impact on that segment. The Company continues to evaluate the impact of the new standard on its recently acquired Trex Commercial Products segment and expects to complete the evaluation during the fourth quarter of 2017. The Company expects expanded financial statement note disclosure. The Company continues to evaluate the impacts of the pending adoption. As such, the Company’s preliminary assessments are subject to change.

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Acquisition

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Acquisition

6. ACQUISITION

On July 31, 2017, through its newly-formed, wholly-owned subsidiary, Trex Commercial Products, the Company acquired certain assets and assumed certain liabilities of SC Company for $71.8 million in cash, subject to adjustment pending final determination of working capital at closing. The Company used cash on hand and $30.0 million of funding from its existing revolving credit facility, which was fully paid on August 17, 2017, to acquire the assets. The acquired business designs, engineers and markets modular architectural railing systems and solutions for the commercial and multifamily markets, and provides staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. As a result of the purchase, the Company gained access to growing commercial markets, expanded its custom design and engineering capabilities, and added the contract architect and specifier communities as new channels for its products.

The acquisition was accounted for using the acquisition method of accounting under U.S. Generally Accepted Accounting Principles, which requires, among other things, that the assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. The fair values of consideration transferred and net assets acquired were determined using a combination of Level 2 and Level 3 inputs as specified in the fair value hierarchy in ASC 820, “Fair Value Measurements and Disclosures.” The Company believes that the fair values assigned to the assets acquired and liabilities assumed are based on reasonable assumptions. The Company’s consolidated results of operations for the quarterly and nine-month period ended September 30, 2017 include the operating results of the acquired business from the date of acquisition through quarter end. The Company’s consolidated balance sheet at September 30, 2017 includes the acquired assets and any liabilities assumed.

Based on the Company’s preliminary valuation, a total estimated consideration of $71.8 million has been allocated on a preliminary basis to the assets acquired and liabilities assumed, as follows (in thousands). A final determination of the purchase price and adjustment to the fair values of assets acquired and liabilities assumed and finalization of the valuation report will be completed upon the final determination of working capital at closing:

Accounts receivable, net	$	8,357
Contract retainage		1,948
Inventories, net		2,344
Prepaid expenses and other assets		1,223
Revenues in excess of billings		3,463
Fixed assets, net		1,264
Intangible assets		4,900
Goodwill		57,938
Accounts payable		(3,990	)
Accrued liabilities and other expenses		(2,329	)
Billings in excess of revenues		(1,752	)
Customer Deposits		(1,562	)
Total estimated consideration	$	71,804

The preliminary goodwill of $57.9 million is primarily attributable to the potential opportunity for the Company to offer full service railing systems in the growing commercial and multi-family markets, access to a complementary product category with a track record of substantial revenue growth, the ability to achieve economies of scale around raw material procurement, an increase in the range of products the Company may offer its core customers, and intangible assets that do not qualify for separable or legal criterion, such as an assembled workforce. The amount of goodwill that is expected to be amortized and deductible for tax purposes in 2017 is $1.1 million. All of the goodwill was recorded to the Trex Commercial Products reportable segment. The fair value attributed to intangible assets, which consists of production backlog and trade names and trademarks, is being amortized straight line over 12 months and is based on the estimated economics of the assets. The fair value attributed to the intangible assets acquired and goodwill was based on assumptions and other information compiled by management, including independent valuations that utilized established valuation techniques.

From July 31, 2017, through September 31, 2017, Trex Commercial Products generated $9.2 million of revenue and incurred a net loss of $75 thousand. The Company incurred $0.5 million of acquisition-related expenses during the nine months ended September 30, 2017, which are included in selling, general and administrative expense.

The following pro forma results are prepared for comparative purposes only and do not necessarily reflect the results that would have occurred had the acquisition occurred at the beginning of the years presented or the results which may occur in the future. The following unaudited pro forma results of operations assume the acquisition occurred on January 1, 2016 (in thousands, except per share amounts):

	Nine Months Ended September 30
	2017		2016		2017		2016
	Actual				Pro Forma
Net sales	$	442,941	$	384,294	$	475,076	$	427,043
Net income	$	76,829	$	55,217	$	77,570	$	54,978
Basic earnings per common share	$	2.61	$	1.88	$	2.64	$	1.87
Diluted earnings per common share	$	2.60	$	1.86	$	2.62	$	1.86

Significant pro forma adjustments included in the above pro forma information include an adjustment to amortization expense for the intangible assets acquired (see Note 9), elimination of transaction costs related to the acquisition as such costs are considered to be non-recurring in nature, an adjustment to compensation expense related to restricted stock units granted in connection with the acquisition, the income tax effects of the adjustments based on a blended statutory rate of 38.0%, and an adjustment to SC Company’s income taxes to the blended statutory rate, as SC Company was treated as a limited liability company for Federal and state income tax purposes.

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Inventories

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Inventories

7. INVENTORIES

Inventories valued at LIFO (last-in, first-out), consist of the following (in thousands):

	September 30, 2017			December 31, 2016
Finished goods	$	23,486		$	29,686
Raw materials		21,344			20,231
Total FIFO (first-in, first-out) inventories		44,830			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	23,459		$	28,546

The Company utilizes the LIFO method of accounting related to its wood-alternative decking and residential railing products, which generally provides for the matching of current costs with current revenues. However, under the LIFO method, reductions in annual inventory balances cause a portion of the Company’s cost of sales to be based on historical costs rather than current year costs (LIFO liquidation). Reductions in interim inventory balances expected to be replenished by year-end do not result in a LIFO liquidation. Accordingly, interim LIFO calculations are based, in part, on management’s estimates of expected year-end inventory levels and costs which may differ from actual results. Since inventory levels and costs are subject to factors beyond management’s control, interim results are subject to the final year-end LIFO inventory valuation. There were no LIFO inventory liquidations or related impact on cost of sales in the nine months ended September 30, 2017 or 2016.

Inventories valued at lower of cost (FIFO method) and net realizable value consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Work-in-process	$	580	$	—
Raw materials		1,990		—
Total FIFO inventories	$	2,570	$	—

The Company utilizes the FIFO method of accounting related to its commercial railing and staging products. Work-in-process includes estimated production costs.

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Prepaid Expenses and Other Assets

9 Months Ended

Sep. 30, 2017

Text Block [Abstract]

Prepaid Expenses and Other Assets

8. PREPAID EXPENSES AND OTHER ASSETS

Prepaid expenses and other assets consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Prepaid expenses	$	3,190	$	6,209
Income tax receivable		—		4,024
Other		722		167
Total prepaid expenses and other assets	$	3,912	$	10,400

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Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

9. GOODWILL AND OTHER INTANGIBLE ASSETS

The following table summarizes the activity related to the carrying amount of goodwill during the nine months ended September 30, 2017 (in thousands):

	2017
Beginning balance, January 1	$	10,523
Goodwill recognized from acquisition of SC Company		57,938
Ending balance, September 30	$	68,461

Intangible assets acquired from SC Company on July 31, 2017 consist of the following at September 30, 2017:

	Net Carrying Amount (in thousands)			Amortization Period
				(in months)
Intangible assets:
Customer backlog	$	4,000			12
Trade names and trademarks		900			12
Total intangible assets		4,900
Accumulated amortization:
Customer backlog		(683	)
Trade name		(134	)
Total accumulated amortization		(817	)
Intantible assets, net	$	4,083

Intangible asset amounts were determined based on the estimated economics of the asset and are amortized over the estimated useful lives on a straight-line bases, which approximates the pattern in which the economic benefits are expected to be received. Amortization expense for the quarterly period ended September 31, 2017 was $0.8 million.

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Accrued Expenses and Other Liabilities

9 Months Ended

Sep. 30, 2017

Payables and Accruals [Abstract]

Accrued Expenses and Other Liabilities

10. ACCRUED EXPENSES AND OTHER LIABILITIES

Accrued expenses and other liabilities consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Sales and marketing	$	21,013	$	16,707
Compensation and benefits		10,727		13,298
Income taxes		3,674		—
Manufacturing costs		1,215		1,799
Rent obligations		739		632
Other		3,959		2,257
Total accrued expenses and other liabilities	$	41,327	$	34,693

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Debt

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

11. DEBT

The Company’s outstanding debt consists of a revolving credit facility.

Revolving Credit Facility

On January 12, 2016, the Company entered into a Third Amended and Restated Credit Agreement, as amended, with Bank of America, N.A. as Lender, Administrative Agent, Swing Line Lender and Letter of Credit Issuer, and certain other lenders including Citibank, N.A., Capital One, N.A., and SunTrust. The Third Amended Credit Agreement, as amended, provides the Company with one or more revolving loans in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021.

The Company had no outstanding borrowings under its revolving credit facility and remaining available borrowing capacity of $200 million at September 30, 2017.

Compliance with Debt Covenants and Restrictions

The Company’s ability to make scheduled principal and interest payments, borrow and repay amounts under any outstanding revolving credit facility and continue to comply with any loan covenants depends primarily on the Company’s ability to generate sufficient cash flow from operations.

As of September 30, 2017, the Company was in compliance with all of the covenants contained in its debt agreements. Failure to comply with the loan covenants might cause lenders to accelerate the repayment obligations under the credit facility, which may be declared payable immediately based on a default.

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Financial Instruments

9 Months Ended

Sep. 30, 2017

Investments, All Other Investments [Abstract]

Financial Instruments

12. FINANCIAL INSTRUMENTS

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at September 30, 2017 and December 31, 2016.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Stockholders' Equity

13. STOCKHOLDERS’ EQUITY

Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Numerator:
Net income available to common shareholders	$	20,098	$	7,787	$	76,829	$	55,217
Denominator:
Basic weighted average shares outstanding		29,404,049		29,295,284		29,385,722		29,419,958
Effect of dilutive securities:
Stock appreciation rights and options		97,315		116,803		98,905		133,907
Restricted stock		76,852		104,631		78,870		81,931
Diluted weighted average shares outstanding		29,578,216		29,516,718		29,563,497		29,635,796
Basic earnings per share	$	0.68	$	0.27	$	2.61	$	1.88
Diluted earnings per share	$	0.68	$	0.26	$	2.60	$	1.86

Diluted earnings per share is computed using the weighted average number of shares determined for the basic earnings per share computation plus the dilutive effect of common stock equivalents using the treasury stock method. The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights		17,957		—		14,156		6,174
Restricted stock		330		46		110		15

Stock Repurchase Programs

On October 22, 2015, the Board of Directors adopted a stock repurchase program of up to 3,150,000 shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company repurchased 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2,960,000 shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

14. STOCK-BASED COMPENSATION

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of September 30, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

The following table summarizes the Company’s stock-based compensation grants for the nine months ended September 30, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		36,105	$	72.50
Performance-based restricted stock units (a)		43,307	$	57.54
Stock appreciation rights		18,739	$	70.75

(a) Includes 25,986 of target performance-based restricted stock unit awards granted during the nine months ended September 30, 2017, and adjustments of 1,071, 5,396 and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the nine months ended September 30, 2016. For SARs issued in the nine months ended September 30, 2017 the data and assumptions shown in the following table were used:

	Nine Months Ended September 30, 2017
Weighted-average fair value of grants	$	27.97
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42.2	%

The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights	$	28	$	—	$	220	$	184
Time-based restricted stock		417		368		1,557		1,847
Performance-based restricted stock		538		450		2,044		1,680
Employee stock purchase plan		54		43		92		95
Total stock-based compensation	$	1,037	$	861	$	3,913	$	3,806

Total unrecognized compensation cost related to unvested awards as of September 30, 2017 was $4.8 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

15. INCOME TAXES

The Company’s effective tax rate for the nine months ended September 30, 2017 and 2016 was 34.1% and 33.5%, respectively, which resulted in expense of $39.7 million and $27.9 million, respectively. The increase of 0.6% in the effective tax rate was primarily due to lower excess tax benefits in 2017 compared to 2016. In fiscal year 2016, the Company adopted FASB ASU No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The new standard requires excess tax benefits on share-based awards be recognized in the tax provision instead of in equity.

During the nine months ended September 30, 2017 and September 30, 2016, the Company realized $1.4 million and $1.7 million, respectively, of excess tax benefits from stock-based awards and recorded a corresponding benefit to income tax expense.

The Company analyzes its deferred tax assets each reporting period, considering all available positive and negative evidence in determining the expected realization of those deferred tax assets. As of September 30, 2017, the Company maintains a valuation allowance of $4.1 million against deferred tax assets primarily related to state tax credits it estimates will expire before they are realized.

The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of September 30, 2017, for certain tax jurisdictions tax years 2013 through 2016 remain subject to examination. Sales made to foreign distributors are not taxable in any foreign jurisdictions as the Company does not have a taxable presence in any foreign jurisdiction.

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Segment Information

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment Information

16. SEGMENT INFORMATION

Prior to July 31, 2017, the Company operated in one reportable segment. Subsequent to the acquisition of certain assets and assumption of certain liabilities of SC Company on July 31, 2017, the Company operates in two reportable segments:

• Trex Residential Products manufactures wood-alternative decking and railing and related products marketed under the brand name Trex^®. The products are sold to its distributors and two national retailers who, in turn, sell primarily to the residential market, which includes replacement, remodeling and new construction related to outdoor living products.

• Trex Commercial Products designs, engineers, and markets modular and architectural railing systems and solutions for the commercial and multifamily markets, and staging, acoustical and seating systems for commercial markets, including sports stadiums and performing arts venues. The segment’s products are sold through architects, specifiers, contractors, and others doing business within the segment’s commercial market.

The Company’s operating segments have been determined in accordance with its internal management structure, which is organized based on residential and commercial sales activities. The Company evaluates performance of each segment primarily based on net sales and earnings before interest, taxes, depreciation and amortization (EBITDA). The Company uses net sales to assess performance and allocate resources as this measure represents the amount of business the segment engaged in during a given period of time, is an indicator of market growth and acceptance of segment products, and represents the segment’s customers’ spending habits along with the amount of product the segment sells relative to its competitors. The Company uses EBITDA to assess performance and allocate resources because it believes that EBITDA facilitates performance comparison between the segments by eliminating interest, taxes, depreciation and amortization charges to income. The below segment data for the nine months ended September 30, 2017, includes data for Trex Residential Products for the nine-month period and data for Trex Commercial Products from the date of the acquisition of SC Company through September 30, 2017 (in thousands):

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	433,790	$	9,151		$	442,941
Net income (loss)	$	76,904	$	(75	)	$	76,829
EBITDA	$	128,221	$	806		$	129,027
Depreciation and amortization	$	11,087	$	881		$	11,968
Income tax expense	$	39,715	$	—		$	39,715
Capital expenditures	$	11,068	$	40		$	11,108
Total assets	$	232,663	$	78,533		$	311,196

Reconciliation of net income to EBITDA:

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	76,904	$	(75	)	$	76,829
Interest		515		—			515
Taxes		39,715		—			39,715
Depreciation and amortization		11,087		881			11,968
EBITDA	$	128,221	$	806		$	129,027
	Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	131,043	$	9,151		$	140,194
Net income (loss)	$	20,173	$	(75	)	$	20,098
EBITDA	$	34,079	$	806		$	34,885
Depreciation and amortization	$	3,639	$	881		$	4,520
Income tax expense	$	10,208	$	—		$	10,208
Capital expenditures	$	3,943	$	40		$	3,983
Total assets	$	232,663	$	78,533		$	311,196

Reconciliation of net income to EBITDA:

	Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	20,173	$	(75	)	$	20,098
Interest		59		—			59
Taxes		10,208		—			10,208
Depreciation and amortization		3,639		881			4,520
EBITDA	$	34,079	$	806		$	34,885

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Seasonality

9 Months Ended

Sep. 30, 2017

Text Block [Abstract]

Seasonality

17. SEASONALITY

The Company’s operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift demand for Trex products to a later period. As part of its normal business practice and consistent with industry practice, the Company has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of the Company’s product to meet anticipated seasonal consumer demand. The seasonal effects are often offset by the positive effect of the incentive programs.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

18. COMMITMENTS AND CONTINGENCIES

Contract Termination Costs

The Company leases 55,047 square feet of office and storage space that it does not occupy, but has sublet all of the office space for the remainder of the term of its lease obligation, which ends June 30, 2019. The Company estimates that the future sublease receipts will be less than the remaining minimum lease payment obligations under its lease and has recorded a liability for the present value of the expected shortfall.

As of September 30, 2017, minimum payments remaining under the Company’s lease relating to its reconsidered corporate relocation over the years ending December 31, 2017, 2018, and 2019 are $0.5 million, $2.0 million and $1.0 million, respectively. Net minimum receipts remaining under the Company’s existing subleases over the years ending December 31, 2017, 2018 and 2019 are $0.3 million, $1.3 million and $0.7 million, respectively.

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(430	)		(536	)
Accretion of discount		78			113
Decrease in net estimated contract termination costs		(23	)		(85	)
Ending balance, September 30	$	1,100		$	1,598

Product Warranty

The Company warrants that its decking and residential railing products will be free from material defects in workmanship and materials for warranty periods ranging from 10 years to 25 years, depending on the product and its use. If there is a breach of such warranties, the Company has an obligation either to replace the defective product or refund the purchase price. The Company continues to receive and settle claims for products manufactured at its Nevada facility prior to 2007 that exhibit surface flaking and maintains a warranty reserve to provide for the settlement of these claims. Estimating the warranty reserve for surface flaking claims requires management to estimate (1) the number of claims to be settled with payment and (2) the average cost to settle each claim.

To estimate the number of claims to be settled with payment, the Company utilizes actuarial techniques to quantify both the expected number of claims to be received and the percentage of those claims that will ultimately require payment (collectively, elements). Estimates for these elements are quantified using a range of assumptions derived from claim count history and the identification of factors influencing the claim counts. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface defect and communications by the Company in 2013 informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured observable trends in historical claims activity. The cost per claim varies due to a number of factors, including the size of affected decks, the availability and type of replacement material used, the cost of production of replacement material and the method of claim settlement.

The Company monitors surface flaking claims activity each quarter for indications that its estimates require revision. Typically, a majority of surface flaking claims received in a year are received during the summer outdoor season, which spans the second and third quarters. It has been the Company’s practice to utilize the actuarial techniques discussed above during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. The number of claims received in the nine months ended September 30, 2017 was lower than claims received in the nine months ended September 30, 2016, continuing the historical year-over-year decline in incoming claims, and consistent with the Company’s expectations. The average settlement cost per claim experienced in the nine months ended September 30, 2017 was lower than the average settlement cost per claim experienced during the nine months ended September 30, 2016 and consistent with the Company’s expectations for 2017. The Company believes its reserve at September 30, 2017 is sufficient to cover future surface flaking obligations.

The Company’s analysis is based on currently known facts and a number of assumptions, as discussed above, and current expectations. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect the Company’s financial condition, results of operations or cash flows. The Company estimates that the annual number of claims received will continue to decline over time and that the average cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average cost per claim differs materially from expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flows in future periods. The Company estimates that a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims may result in approximately a $2.9 million change in the surface flaking warranty reserve.

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			9,835
Settlements made during the period		(4,425	)		(4,188	)
Ending balance, September 30	$	29,422		$	35,320

The remainder of the Company’s warranty reserve represents amounts accrued for non-surface flaking claims.

Legal Matters

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

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Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Revenue Recognition

Revenue Recognition

For Trex Commercial Products, the Company recognizes revenue using the percentage of completion method measured by the ratio of direct costs incurred to date to estimated total costs for each contract. Contract costs include all direct material, labor, subcontract and certain indirect costs. Administrative costs are charged to expense as incurred. Provisions for estimated losses on uncompleted contracts are recognized when such losses are determined. Changes in job performance, conditions and estimated profitability may result in revisions to costs and income and are recognized in the period they are determined. Revenues recognized in excess of amounts billed are classified under current assets. Billings in excess of revenues are classified under current liabilities.

Concentrations and Credit Risk

Concentrations and Credit Risk

In addition to its trade receivables, the Company assesses the credit risk exposure of its customers’ contracts receivable by considering the length of time receivables may be past due, the customer’s financial condition and ability to repay the obligation, historical and expected credit loss experience, and other factors. Contracts receivable are carried at the original invoice amount in accounts receivable in the Company’s Condensed Consolidated Balance Sheet and are generally due when billed, and contract retainage is generally due at the completion of the construction contract.

Financial Instruments

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at September 30, 2017 and December 31, 2016.

Share-based Compensation

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of September 30, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

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Recently Adopted Accounting Standard (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Changes and Error Corrections [Abstract]

Schedule of Previously Reported Quarterly Data

• The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. Additionally, the standard requires that excess tax benefits are now reported as an operating activity in the Company’s Consolidated Statements of Cash Flows, rather than as a financing activity as was previously reported. The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the three and nine months ended September 30, 2016 have been adjusted, as follows:

	Three Months Ended September 30, 2016
	As Reported		Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	3,591	$	2,702
Net Income	$	6,898	$	7,787
Basic net income per share	$	0.24	$	0.27
Diluted net income per share	$	0.23	$	0.26
Diluted weighted average common shares outstanding		29,457,653		29,516,718

	Nine Months Ended September 30, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	29,510		$	27,871
Net Income	$	53,578		$	55,217
Basic net income per share	$	1.82		$	1.88
Diluted net income per share	$	1.81		$	1.86
Diluted weighted average common shares outstanding		29,581,578			29,635,796
Cash flows provided by operating activities	$	81,880		$	83,579
Cash flows used in financing activities	$	(60,573	)	$	(62,452	)

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Acquisition (Tables)

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Summary of Estimated Consideration Allocated on a Preliminary Basis to Assets Acquired and Liabilities Assumed

Based on the Company’s preliminary valuation, a total estimated consideration of $71.8 million has been allocated on a preliminary basis to the assets acquired and liabilities assumed, as follows (in thousands). 

Accounts receivable, net	$	8,357
Contract retainage		1,948
Inventories, net		2,344
Prepaid expenses and other assets		1,223
Revenues in excess of billings		3,463
Fixed assets, net		1,264
Intangible assets		4,900
Goodwill		57,938
Accounts payable		(3,990	)
Accrued liabilities and other expenses		(2,329	)
Billings in excess of revenues		(1,752	)
Customer Deposits		(1,562	)
Total estimated consideration	$	71,804

Summary of Unaudited Pro Forma Results of Operations

The following unaudited pro forma results of operations assume the acquisition occurred on January 1, 2016 (in thousands, except per share amounts):

	Nine Months Ended September 30
	2017		2016		2017		2016
	Actual				Pro Forma
Net sales	$	442,941	$	384,294	$	475,076	$	427,043
Net income	$	76,829	$	55,217	$	77,570	$	54,978
Basic earnings per common share	$	2.61	$	1.88	$	2.64	$	1.87
Diluted earnings per common share	$	2.60	$	1.86	$	2.62	$	1.86

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Inventories (Tables)

9 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories valued at LIFO (last-in, first-out), consist of the following (in thousands):

	September 30, 2017			December 31, 2016
Finished goods	$	23,486		$	29,686
Raw materials		21,344			20,231
Total FIFO (first-in, first-out) inventories		44,830			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	23,459		$	28,546

Inventories valued at lower of cost (FIFO method) and net realizable value consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Work-in-process	$	580	$	—
Raw materials		1,990		—
Total FIFO inventories	$	2,570	$	—

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Prepaid Expenses and Other Assets (Tables)

9 Months Ended

Sep. 30, 2017

Text Block [Abstract]

Summary of Prepaid Expenses and Other Assets

Prepaid expenses and other assets consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Prepaid expenses	$	3,190	$	6,209
Income tax receivable		—		4,024
Other		722		167
Total prepaid expenses and other assets	$	3,912	$	10,400

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Activity Related to Carrying Amount of Goodwill

The following table summarizes the activity related to the carrying amount of goodwill during the nine months ended September 30, 2017 (in thousands):

	2017
Beginning balance, January 1	$	10,523
Goodwill recognized from acquisition of SC Company		57,938
Ending balance, September 30	$	68,461

Details of Intangible Assets Acquired

Intangible assets acquired from SC Company on July 31, 2017 consist of the following at September 30, 2017:

	Net Carrying Amount (in thousands)			Amortization Period
				(in months)
Intangible assets:
Customer backlog	$	4,000			12
Trade names and trademarks		900			12
Total intangible assets		4,900
Accumulated amortization:
Customer backlog		(683	)
Trade name		(134	)
Total accumulated amortization		(817	)
Intantible assets, net	$	4,083

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Accrued Expenses and Other Liabilities (Tables)

9 Months Ended

Sep. 30, 2017

Payables and Accruals [Abstract]

Summary of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consist of the following (in thousands):

	September 30, 2017		December 31, 2016
Sales and marketing	$	21,013	$	16,707
Compensation and benefits		10,727		13,298
Income taxes		3,674		—
Manufacturing costs		1,215		1,799
Rent obligations		739		632
Other		3,959		2,257
Total accrued expenses and other liabilities	$	41,327	$	34,693

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Numerator:
Net income available to common shareholders	$	20,098	$	7,787	$	76,829	$	55,217
Denominator:
Basic weighted average shares outstanding		29,404,049		29,295,284		29,385,722		29,419,958
Effect of dilutive securities:
Stock appreciation rights and options		97,315		116,803		98,905		133,907
Restricted stock		76,852		104,631		78,870		81,931
Diluted weighted average shares outstanding		29,578,216		29,516,718		29,563,497		29,635,796
Basic earnings per share	$	0.68	$	0.27	$	2.61	$	1.88
Diluted earnings per share	$	0.68	$	0.26	$	2.60	$	1.86

Antidilutive Securities Excluded from Computation of Earnings Per Share

The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights		17,957		—		14,156		6,174
Restricted stock		330		46		110		15

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Grants

The following table summarizes the Company’s stock-based compensation grants for the nine months ended September 30, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		36,105	$	72.50
Performance-based restricted stock units (a)		43,307	$	57.54
Stock appreciation rights		18,739	$	70.75

(a) Includes 25,986 of target performance-based restricted stock unit awards granted during the nine months ended September 30, 2017, and adjustments of 1,071, 5,396 and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

Summary of Assumptions Used to Estimate Fair Value of Each SAR

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the nine months ended September 30, 2016. For SARs issued in the nine months ended September 30, 2017 the data and assumptions shown in the following table were used:

	Nine Months Ended September 30, 2017
Weighted-average fair value of grants	$	27.97
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42.2	%

Summary of Stock-Based Compensation Expense

The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Stock appreciation rights	$	28	$	—	$	220	$	184
Time-based restricted stock		417		368		1,557		1,847
Performance-based restricted stock		538		450		2,044		1,680
Employee stock purchase plan		54		43		92		95
Total stock-based compensation	$	1,037	$	861	$	3,913	$	3,806

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Details of Segment Information

The below segment data for the nine months ended September 30, 2017, includes data for Trex Residential Products for the nine-month period and data for Trex Commercial Products from the date of the acquisition of SC Company through September 30, 2017 (in thousands):

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	433,790	$	9,151		$	442,941
Net income (loss)	$	76,904	$	(75	)	$	76,829
EBITDA	$	128,221	$	806		$	129,027
Depreciation and amortization	$	11,087	$	881		$	11,968
Income tax expense	$	39,715	$	—		$	39,715
Capital expenditures	$	11,068	$	40		$	11,108
Total assets	$	232,663	$	78,533		$	311,196

Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net sales	$	131,043	$	9,151		$	140,194
Net income (loss)	$	20,173	$	(75	)	$	20,098
EBITDA	$	34,079	$	806		$	34,885
Depreciation and amortization	$	3,639	$	881		$	4,520
Income tax expense	$	10,208	$	—		$	10,208
Capital expenditures	$	3,943	$	40		$	3,983
Total assets	$	232,663	$	78,533		$	311,196

Schedule of Reconciliation of Net Income to EBITDA

Reconciliation of net income to EBITDA:

	Nine Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	76,904	$	(75	)	$	76,829
Interest		515		—			515
Taxes		39,715		—			39,715
Depreciation and amortization		11,087		881			11,968
EBITDA	$	128,221	$	806		$	129,027

Reconciliation of net income to EBITDA:

	Three Months Ended September 30, 2017
	Residential		Commercial			Total
Net income (loss)	$	20,173	$	(75	)	$	20,098
Interest		59		—			59
Taxes		10,208		—			10,208
Depreciation and amortization		3,639		881			4,520
EBITDA	$	34,079	$	806		$	34,885

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Liability Related to Lease

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(430	)		(536	)
Accretion of discount		78			113
Decrease in net estimated contract termination costs		(23	)		(85	)
Ending balance, September 30	$	1,100		$	1,598

Summary of Reconciliation of Company's Warranty Reserve that Represents Amounts Accrued for Surface Flaking Claims

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			9,835
Settlements made during the period		(4,425	)		(4,188	)
Ending balance, September 30	$	29,422		$	35,320

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Business and Organization - Additional Information (Detail) - Segment	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017
Business And Organization [Line Items]
Number of reportable segments	1	2
Minimum [Member]
Business And Organization [Line Items]
Number of years of product experience		25 years

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Recently Adopted Accounting Standard - Schedule of Previously Reported Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes	$ 10,208	$ 2,702	$ 39,715	$ 27,871
Net income	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Basic net income per share	$ 0.68	$ 0.27	$ 2.61	$ 1.88
Diluted net income per share	$ 0.68	$ 0.26	$ 2.60	$ 1.86
Diluted weighted average common shares outstanding	29,578,216	29,516,718	29,563,497	29,635,796
Cash flows provided by operating activities			$ 92,837	$ 83,579
Cash flows used in financing activities			$ (3,329)	(62,452)
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes		$ 3,591		29,510
Net income		$ 6,898		$ 53,578
Basic net income per share		$ 0.24		$ 1.82
Diluted net income per share		$ 0.23		$ 1.81
Diluted weighted average common shares outstanding		29,457,653		29,581,578
Cash flows provided by operating activities				$ 81,880
Cash flows used in financing activities				$ (60,573)

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Acquisition - Additional Information (Detail) - USD ($)			2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 17, 2017	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Fund used to acquire business from revolving credit facility			$ 0	$ 0		$ 0
Repayment of revolving credit facility						201,000,000	$ 249,700,000
Goodwill			68,461,000	68,461,000		68,461,000		$ 10,523,000
Net income (loss)				20,098,000	$ 7,787,000	76,829,000	$ 55,217,000
Acquisition-related expenses						$ 500,000
Blended statutory rate						38.00%
Trex Commercial Products, Inc. (TCP) [Member]
Business Acquisition [Line Items]
Revenue			9,200,000
Net income (loss)			(75,000)
Staging Concepts Acquisition, LLC [Member]
Business Acquisition [Line Items]
Certain assets and liabilities acquired in cash		$ 71,800,000
Estimated consideration			71,804,000	71,804,000		$ 71,804,000
Goodwill			57,938,000	57,938,000		57,938,000
Goodwill expected to be amortized and deductible for tax purposes			$ 1,100,000	$ 1,100,000		$ 1,100,000
Amortization period for intangible assets						12 months
Staging Concepts Acquisition, LLC [Member] | Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Fund used to acquire business from revolving credit facility		$ 30,000,000
Repayment of revolving credit facility	$ 30,000,000

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Acquisition - Summary of Estimated Consideration Allocated on a Preliminary Basis to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 68,461	$ 10,523
Staging Concepts Acquisition, LLC [Member]
Business Acquisition [Line Items]
Accounts receivable, net	8,357
Contract retainage	1,948
Inventories, net	2,344
Prepaid expenses and other assets	1,223
Revenues in excess of billings	3,463
Fixed assets, net	1,264
Intangible assets	4,900
Goodwill	57,938
Accounts payable	(3,990)
Accrued liabilities and other expenses	(2,329)
Billings in excess of revenues	(1,752)
Customer Deposits	(1,562)
Total estimated consideration	$ 71,804

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Acquisition - Summary of Unaudited Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Combinations [Abstract]
Net sales	$ 140,194	$ 106,168	$ 442,941	$ 384,294
Net income	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Basic earnings per common share	$ 0.68	$ 0.27	$ 2.61	$ 1.88
Diluted earnings per common share	$ 0.68	$ 0.26	$ 2.60	$ 1.86
Pro Forma Net sales			$ 475,076	$ 427,043
Pro Forma Net income			$ 77,570	$ 54,978
Pro Forma Basic earnings per common share			$ 2.64	$ 1.87
Pro Forma Diluted earnings per common share			$ 2.62	$ 1.86

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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Inventory [Line Items]
Total LIFO inventories	$ 26,029	$ 28,546
LIFO [Member]
Inventory [Line Items]
Finished goods	23,486	29,686
Raw materials	21,344	20,231
Total FIFO (first-in,first-out) inventories	44,830	49,917
Reserve to adjust inventories to LIFO value	(21,371)	(21,371)
Total LIFO inventories	23,459	$ 28,546
FIFO [Member]
Inventory [Line Items]
Work-in-process	580
Raw materials	1,990
Total FIFO (first-in,first-out) inventories	$ 2,570

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Inventories - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Inventory Disclosure [Abstract]
LIFO inventory liquidations	$ 0	$ 0

XML

Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 3,190	$ 6,209
Income tax receivable		4,024
Other	722	167
Total prepaid expenses and other assets	$ 3,912	$ 10,400

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Goodwill and Other Intangible Assets - Summary of Activity Related to Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 10,523
Goodwill recognized from acquisition of SC Company	57,938
Ending balance	$ 68,461

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Goodwill and Other Intangible Assets - Details of Intangible Assets Acquired (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Net carrying amount,Intangible assets	$ 4,900
Net carrying amount, Accumulated amortization	(817)
Intantible assets, net	4,083
Customer Backlog [Member]
Indefinite-lived Intangible Assets [Line Items]
Net carrying amount,Intangible assets	4,000
Net carrying amount, Accumulated amortization	$ (683)
Amortization period	12 months
Trade Names and Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Net carrying amount,Intangible assets	$ 900
Amortization period	12 months
Trade Name [Member]
Indefinite-lived Intangible Assets [Line Items]
Net carrying amount, Accumulated amortization	$ (134)

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Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 0.8

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Accrued Expenses and Other Liabilities - Summary of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Sales and marketing	$ 21,013	$ 16,707
Compensation and benefits	10,727	13,298
Income taxes	3,674
Manufacturing costs	1,215	1,799
Rent obligations	739	632
Other	3,959	2,257
Total accrued expenses and other liabilities	$ 41,327	$ 34,693

XML

Debt - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings under the revolver loans	$ 0
Remaining available borrowing capacity	$ 200,000,000
Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination date of the Credit Agreement	Jan. 12, 2021
Revolver Loans Portion Effective January 1 through June 30 [Member] | Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	$ 250,000,000
Revolver Loans Portion Effective July 1 through December 31 [Member] | Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	$ 200,000,000

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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income available to common shareholders	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Denominator:
Basic weighted average shares outstanding	29,404,049	29,295,284	29,385,722	29,419,958
Effect of dilutive securities:
Diluted weighted average shares outstanding	29,578,216	29,516,718	29,563,497	29,635,796
Basic earnings per share	$ 0.68	$ 0.27	$ 2.61	$ 1.88
Diluted earnings per share	$ 0.68	$ 0.26	$ 2.60	$ 1.86
Stock Appreciation Rights and Options [Member]
Effect of dilutive securities:
Dilutive securities	97,315	116,803	98,905	133,907
Restricted Stock [Member]
Effect of dilutive securities:
Dilutive securities	76,852	104,631	78,870	81,931

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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock Appreciation Rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted earnings per share	17,957		14,156	6,174
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted earnings per share	330	46	110	15

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Feb. 16, 2017	Oct. 22, 2015
October 2015 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares			3,150,000
Common stock repurchase program, termination date	Dec. 31, 2016
Number of shares repurchased by the Company	1,578,952
Value of shares repurchased by the Company	$ 53.3
February 2017 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares		2,960,000
Number of shares repurchased by the Company	0

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Stock-Based Compensation - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) Plan shares	Sep. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock based compensation plans | Plan	1
Unrecognized compensation cost related to unvested awards | $	$ 4.8
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total aggregate number of shares of common stock that may be issued	6,420,000
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions method used	Black-Scholes option-pricing formula
Number of shares or rights issued	18,739	0

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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	36,105
Weighted-Average Grant Price Per Share	$ 72.50
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	43,307
Weighted-Average Grant Price Per Share	$ 57.54
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	18,739	0
Weighted-Average Grant Price Per Share	$ 70.75

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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Parenthetical) (Detail) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Performance Based Restricted Stock Unit Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	25,986
Performance Based Restricted Stock Unit Adjustment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted		10,854	5,396	1,071

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Stock-Based Compensation - Summary of Assumptions Used to Estimate Fair Value of Each SAR (Detail) - Stock Appreciation Rights [Member]	9 Months Ended
	Sep. 30, 2017 $ / shares
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions and Methodology [Line Items]
Weighted-average fair value of grants	$ 27.97
Dividend yield	0.00%
Average risk-free interest rate	2.00%
Expected term (years)	5 years
Expected volatility	42.20%

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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,037	$ 861	$ 3,913	$ 3,806
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	28		220	184
Time-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	417	368	1,557	1,847
Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	538	450	2,044	1,680
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 54	$ 43	$ 92	$ 95

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Contingency [Line Items]
Effective tax rate			34.10%	33.50%
Income tax expense (benefit)	$ 10,208	$ 2,702	$ 39,715	$ 27,871
Increase in effective tax rate due to increase in domestic production activities deduction			0.60%
Excess tax benefits from stock based awards			$ 1,400	$ 1,700
Valuation allowance	$ 4,100		$ 4,100
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2013
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2016

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Segment Information - Additional Information (Detail)	7 Months Ended	9 Months Ended
	Jul. 31, 2017 Segment	Sep. 30, 2017 Segment Retailer
Segment Reporting [Abstract]
Number of reportable segment | Segment	1	2
Number of national retailers | Retailer		2

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Segment Information - Details of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 140,194	$ 106,168	$ 442,941	$ 384,294
Net income (loss)	20,098	7,787	76,829	55,217
Depreciation and amortization			12,065	10,893
Income tax expense	10,208	$ 2,702	39,715	$ 27,871
Total assets	311,196		311,196		$ 221,430
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	140,194		442,941
Net income (loss)	20,098		76,829
EBITDA	34,885		129,027
Depreciation and amortization	4,520		11,968
Income tax expense	10,208		39,715
Capital expenditures	3,983		11,108
Total assets	311,196		311,196
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net sales	131,043		433,790
Net income (loss)	20,173		76,904
EBITDA	34,079		128,221
Depreciation and amortization	3,639		11,087
Income tax expense	10,208		39,715
Capital expenditures	3,943		11,068
Total assets	232,663		232,663
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net sales	9,151		9,151
Net income (loss)	(75)		(75)
EBITDA	806		806
Depreciation and amortization	881		881
Capital expenditures	40		40
Total assets	$ 78,533		$ 78,533

XML

Segment Information - Schedule of Reconciliation of Net Income to EBITDA (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net income (loss)	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Interest	59	77	515	1,108
Taxes	10,208	$ 2,702	39,715	27,871
Depreciation and amortization			12,065	$ 10,893
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income (loss)	20,098		76,829
Interest	59		515
Taxes	10,208		39,715
Depreciation and amortization	4,520		11,968
EBITDA	34,885		129,027
Operating Segments [Member] | Residential [Member]
Segment Reporting Information [Line Items]
Net income (loss)	20,173		76,904
Interest	59		515
Taxes	10,208		39,715
Depreciation and amortization	3,639		11,087
EBITDA	34,079		128,221
Operating Segments [Member] | Commercial [Member]
Segment Reporting Information [Line Items]
Net income (loss)	(75)		(75)
Depreciation and amortization	881		881
EBITDA	$ 806		$ 806

XML

Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) ft²
Schedule Of Commitments And Contingencies [Line Items]
Change in warranty reserve for disclosure purposes only	$ 2.9
Minimum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	10 years
Maximum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Surface Flaking Warranty Reserve [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage change in warranty claims used as a threshold for disclosure	10.00%
Sublease [Member]
Schedule Of Commitments And Contingencies [Line Items]
Net minimum receipts remaining under the Company's existing subleases for 2017	$ 0.3
Net minimum receipts remaining under the Company's existing subleases for 2018	1.3
Net minimum receipts remaining under the Company's existing subleases for 2019	$ 0.7
Contract Termination [Member]
Schedule Of Commitments And Contingencies [Line Items]
Lease square feet | ft²	55,047
Minimum payments, 2017	$ 0.5
Minimum payments, 2018	2.0
Minimum payments, 2019	$ 1.0

XML

Commitments and Contingencies - Summary of Liability Related to Lease (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Beginning balance	$ 1,475	$ 2,106
Net rental payments	(430)	(536)
Accretion of discount	78	113
Decrease in net estimated contract termination costs	(23)	(85)
Ending balance	$ 1,100	$ 1,598

XML

Commitments and Contingencies - Summary of Reconciliation of Company's Warranty Reserve that Represents Amounts Accrued for Surface Flaking Claims (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Product Warranty Liability [Line Items]
Beginning balance	$ 33,847	$ 29,673
Changes in estimates related to pre-existing warranties		9,835
Settlements made during the period	(4,425)	(4,188)
Ending balance	$ 29,422	$ 35,320