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Table of Contents

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 March 31, 2021
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 0-22462

GIBRALTAR INDUSTRIES, INC.
(Exact name of Registrant as specified in its charter)

Delaware |  | 16-1445150
(State or incorporation ) |  | (I.R.S. Employer Identification No.)
3556 Lake Shore Road | P.O. Box 2028 | Buffalo | New York |  | 14219-0228
(Address of principal executive offices) |  | (Zip Code)

Registrant’s telephone number, including area code: (716) 826-6500
Securities registered pursuant to Section 12(b) of the Act:

Title of each class |  | Trading Symbol |  | Name of each exchange on which registered
Common Stock, $0.01 par value per share |  | ROCK |  | NASDAQ Stock Market

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 every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

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. ☐
Indicated by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒
As of May 4, 2021, the number of common shares outstanding was: 32,629,646.

Table of Contents
GIBRALTAR INDUSTRIES, INC.
INDEX

| PAGE NUMBER
PART I. |  | FINANCIAL INFORMATION |
Item 1. |  | Financial Statements |
|  | Consolidated Statements of Income for the Three Months Ended March 3 1, 202 1 and 20 20 (unaudited) | 3
|  | Consolidated Statements of Comprehensive Income for the Three Months Ended March 3 1, 202 1 and 20 20 (unaudited) | 4
|  | Consolidated Balance Sheets as of March 3 1, 202 1 (unaudited) and December 31, 20 20 | 5
|  | Consolidated Statements of Cash Flows for the Three Months Ended March 3 1, 202 1 and 20 20 (unaudited) | 6
|  | Consolidated Statement of S tock holders’ Equity for the Three Months Ended March 3 1, 202 1 and 20 20 (unaudited) | 7
|  | Notes to Consolidated Financial Statements (unaudited) | 9
Item 2. |  | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 23
Item 3. |  | Quantitative and Qualitative Disclosures About Market Risk | 31
Item 4. |  | Controls and Procedures | 31
PART II. |  | OTHER INFORMATION |
Item 1. |  | Legal Proceedings | 31
Item 1A. |  | Risk Factors | 31
Item 2. |  | Unregistered Sales of Equity Securities and Use of Proceeds | 31
Item 3. |  | Defaults Upon Senior Securities | 31
Item 4. |  | Mine Safety Disclosures | 31
Item 5. |  | Other Information | 31
Item 6. |  | Exhibits | 32
|  | SIGNATURES | 33

2

Table of Contents
PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED STATEMENTS OF INCOME
(in thousands, except per share data)
(unaudited)

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Net Sales | $ | 287,592 |  |  | $ | 215,401 |  |  |  |  |
Cost of sales | 227,574 |  |  | 165,540 |  |  |  |  |
Gross profit | 60,018 |  |  | 49,861 |  |  |  |  |
Selling, general, and administrative expense | 47,203 |  |  | 37,084 |  |  |  |  |
Income from operations | 12,815 |  |  | 12,777 |  |  |  |  |
Interest expense | 444 |  |  | 44 |  |  |  |  |
Other expense | 315 |  |  | 518 |  |  |  |  |
Income before taxes | 12,056 |  |  | 12,215 |  |  |  |  |
Provision for income taxes | 1,560 |  |  | 2,313 |  |  |  |  |
Income from continuing operations | 10,496 |  |  | 9,902 |  |  |  |  |
Discontinued operations: |  |  |  |  |  |  |
Income before taxes | 2,570 |  |  | 2,830 |  |  |  |  |
Provision for income taxes | 304 |  |  | 673 |  |  |  |  |
Income from discontinued operations | 2,266 |  |  | 2,157 |  |  |  |  |
Net income | $ | 12,762 |  |  | $ | 12,059 |  |  |  |  |
Net earnings per share – Basic: |  |  |  |  |  |  |
Income from continuing operations | $ | 0.32 |  |  | $ | 0.30 |  |  |  |  |
Income from discontinued operations | 0.07 |  |  | 0.07 |  |  |  |  |
Net income | $ | 0.39 |  |  | $ | 0.37 |  |  |  |  |
Weighted average shares outstanding -- Basic | 32,771 |  |  | 32,586 |  |  |  |  |
Net earnings per share – Diluted: |  |  |  |  |  |  |
Income from continuing operations | $ | 0.32 |  |  | $ | 0.30 |  |  |  |  |
Income from discontinued operations | 0.07 |  |  | 0.07 |  |  |  |  |
Net income | $ | 0.39 |  |  | $ | 0.37 |  |  |  |  |
Weighted average shares outstanding -- Diluted | 33,104 |  |  | 32,883 |  |  |  |  |

See accompanying notes to consolidated financial statements.
3

Table of Contents
GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(in thousands)
(unaudited)

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Net income | $ | 12,762 |  |  | $ | 12,059 |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |  |  |
Foreign currency translation adjustment | 3,198 |  |  | (5,898) |  |  |  |  |
Minimum post retirement benefit plan adjustments | 27 |  |  | 18 |  |  |  |  |
Other comprehensive income (loss) | 3,225 |  |  | (5,880) |  |  |  |  |
Total comprehensive income | $ | 15,987 |  |  | $ | 6,179 |  |  |  |  |

See accompanying notes to consolidated financial statements.
4

Table of Contents
GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED BALANCE SHEETS
(in thousands, except per share data)

| March 31, 2021 |  | December 31, 2020
| (unaudited) |  |
Assets |  |  |
Current assets: |  |  |
Cash and cash equivalents | $ | 20,731 |  |  | $ | 32,054 |
Accounts receivable, net of allowance of $3,319 and $3,529 | 199,598 |  |  | 197,990 |
Inventories, net | 107,004 |  |  | 98,307 |
Prepaid expenses and other current assets | 24,684 |  |  | 19,671 |
Assets of discontinued operations | — |  |  | 77,438 |
Total current assets | 352,017 |  |  | 425,460 |
Property, plant, and equipment, net | 91,717 |  |  | 89,562 |
Operating lease assets | 23,465 |  |  | 25,229 |
Goodwill | 523,446 |  |  | 514,279 |
Acquired intangibles | 151,877 |  |  | 156,365 |
Other assets | 12,669 |  |  | 1,599 |
| $ | 1,155,191 |  |  | $ | 1,212,494 |
Liabilities and Stockholders’ Equity |  |  |
Current liabilities: |  |  |
Accounts payable | $ | 135,130 |  |  | $ | 134,738 |
Accrued expenses | 71,946 |  |  | 83,505 |
Billings in excess of cost | 51,591 |  |  | 34,702 |
Liabilities of discontinued operations | — |  |  | 49,295 |
Total current liabilities | 258,667 |  |  | 302,240 |
Long-term debt | 58,023 |  |  | 85,636 |
Deferred income taxes | 37,996 |  |  | 39,057 |
Non-current operating lease liabilities | 16,165 |  |  | 17,730 |
Other non-current liabilities | 25,932 |  |  | 24,026 |
Stockholders’ equity: |  |  |
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding | — |  |  | — |
Common stock, $0.01 par value; authorized 50,000 shares; 33,711 shares and 33,568 shares issued and outstanding in 2021 and 2020 | 337 |  |  | 336 |
Additional paid-in capital | 308,147 |  |  | 304,870 |
Retained earnings | 482,705 |  |  | 469,943 |
Accumulated other comprehensive income (loss) | 764 |  |  | (2,461) |
Cost of 1,082 and 1,028 common shares held in treasury in 2021 and 2020 | (33,545) |  |  | (28,883) |
Total stockholders’ equity | 758,408 |  |  | 743,805 |
| $ | 1,155,191 |  |  | $ | 1,212,494 |

See accompanying notes to consolidated financial statements.
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GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
(unaudited)

| Three Months Ended March 31,
| 2021 |  | 2020
Cash Flows from Operating Activities |  |  |
Net income | $ | 12,762 |  |  | $ | 12,059 |
Income from discontinued operations | 2,266 |  |  | 2,157 |
Income from continuing operations | 10,496 |  |  | 9,902 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 7,974 |  |  | 4,780 |
Stock compensation expense | 2,368 |  |  | 1,665 |
Exit activity costs, non-cash | 1,193 |  |  | — |
Benefit of deferred income taxes | — |  |  | (178) |
Other, net | (162) |  |  | 386 |
Changes in operating assets and liabilities, excluding the effects of acquisitions: |  |  |
Accounts receivable | (2,522) |  |  | (7,180) |
Inventories | (15,262) |  |  | (7,242) |
Other current assets and other assets | (435) |  |  | 6,218 |
Accounts payable | 1,470 |  |  | (18,909) |
Accrued expenses and other non-current liabilities | (6,334) |  |  | (33,268) |
Net cash used in operating activities of continuing operations | (1,214) |  |  | (43,826) |
Net cash (used in) provided by operating activities of discontinued operations | (2,011) |  |  | 814 |
Net cash used in operating activities | (3,225) |  |  | (43,012) |
Cash Flows from Investing Activities |  |  |
Purchases of property, plant, and equipment | (4,389) |  |  | (2,144) |
Acquisitions, net of cash acquired | (2) |  |  | (54,539) |
Net proceeds from sale of business | 26,991 |  |  | — |
Net proceeds from sale of property and equipment | — |  |  | 52 |
Net cash provided by (used in) investing activities of continuing operations | 22,600 |  |  | (56,631) |
Net cash used in investing activities of discontinued operations | (176) |  |  | (678) |
Net cash provided by (used in) investing activities | 22,424 |  |  | (57,309) |
Cash Flows from Financing Activities |  |  |
Proceeds from long-term debt | 20,000 |  |  | — |
Long-term debt payments | (46,636) |  |  | — |
Purchase of treasury stock at market prices | (4,662) |  |  | (4,184) |
Net proceeds from issuance of common stock | 910 |  |  | 24 |
Net cash used in financing activities | (30,388) |  |  | (4,160) |
Effect of exchange rate changes on cash | (134) |  |  | (916) |
Net decrease in cash and cash equivalents | (11,323) |  |  | (105,397) |
Cash and cash equivalents at beginning of year | 32,054 |  |  | 191,363 |
Cash and cash equivalents at end of period | $ | 20,731 |  |  | $ | 85,966 |

See accompanying notes to consolidated financial statements.
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GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY
(in thousands)
(unaudited)

| Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Accumulated Other Comprehensive (Loss) Income |  | Treasury Stock |  | Total Stockholders’ Equity
| Shares |  | Amount |  |  |  |  | Shares |  | Amount |
Balance at December 31, 2020 | 33,568 |  |  | $ | 336 |  |  | $ | 304,870 |  |  | $ | 469,943 |  |  | $ | (2,461) |  |  | 1,028 |  |  | $ | (28,883) |  |  | $ | 743,805 |
Net income | — |  |  | — |  |  | — |  |  | 12,762 |  |  | — |  |  | — |  |  | — |  |  | 12,762 |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | 3,198 |  |  | — |  |  | — |  |  | 3,198 |
Minimum post retirement benefit plan adjustments, net of taxes of $10 | — |  |  | — |  |  | — |  |  | — |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Stock compensation expense | — |  |  | — |  |  | 2,368 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,368 |
Stock options exercised | 25 |  |  | — |  |  | 910 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 910 |
Net settlement of restricted stock units | 118 |  |  | 1 |  |  | (1) |  |  | — |  |  | — |  |  | 54 |  |  | (4,662) |  |  | (4,662) |
Balance at March 31, 2021 | 33,711 |  |  | $ | 337 |  |  | $ | 308,147 |  |  | $ | 482,705 |  |  | $ | 764 |  |  | 1,082 |  |  | $ | (33,545) |  |  | $ | 758,408 |

See accompanying notes to consolidated financial statements.
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GIBRALTAR INDUSTRIES, INC.
CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY
(in thousands)
(unaudited)

| Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Accumulated Other Comprehensive Loss |  | Treasury Stock |  | Total Stockholders’ Equity |
| Shares |  | Amount |  |  |  |  | Shares |  | Amount |  |
Balance at December 31, 2019 | 33,192 |  |  | $ | 332 |  |  | $ | 295,582 |  |  | $ | 405,668 |  |  | $ | (5,391) |  |  | 906 |  |  | $ | (22,227) |  |  | $ | 673,964 |  |
Net income | — |  |  | — |  |  | — |  |  | 12,059 |  |  | — |  |  | — |  |  | — |  |  | 12,059 |  |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | (5,898) |  |  | — |  |  | — |  |  | (5,898) |  |
Minimum post retirement benefit plan adjustments, net of taxes of $7 | — |  |  | — |  |  | — |  |  | — |  |  | 18 |  |  | — |  |  | — |  |  | 18 |  |
Stock compensation expense | — |  |  | — |  |  | 1,665 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,665 |  |
Cumulative effect of accounting change | — |  |  | — |  |  | — |  |  | (291) |  |  | — |  |  | — |  |  | — |  |  | (291) |  |
Stock options exercised | 3 |  |  | — |  |  | 24 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 24 |  |
Net settlement of restricted stock units | 193 |  |  | 2 |  |  | (2) |  |  | — |  |  | — |  |  | 80 |  |  | (4,184) |  |  | (4,184) |  |
Balance at March 31, 2020 | 33,388 |  |  | $ | 334 |  |  | $ | 297,269 |  |  | $ | 417,436 |  |  | $ | (11,271) |  |  | 986 |  |  | $ | (26,411) |  |  | $ | 677,357 |  |

See accompanying notes to consolidated financial statements.
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GIBRALTAR INDUSTRIES, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(unaudited)
(1) CONSOLIDATED FINANCIAL STATEMENTS
The accompanying unaudited consolidated financial statements of Gibraltar Industries, Inc. (the "Company") have been prepared by management in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments consisting of normal recurring adjustments considered necessary for the fair presentation of results for the interim period have been included. The Company's operations are seasonal; for this and other reasons, such as the impact of the COVID-19 pandemic, financial results for any interim period are not necessarily indicative of the results expected for any subsequent interim period or for the full year. The accompanying unaudited consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in our annual Form 10-K for the year ended December 31, 2020.
The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date, but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.
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(2) RECENT ACCOUNTING PRONOUNCEMENTS
Recent Accounting Pronouncements Adopted

Standard |  | Description |  | Financial Statement Effect or Other Significant Matters
ASU No. 2019-12 Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes |  | The amendments in this update simplify the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and improve consistent application by clarifying and amending existing guidance. The amendments of this standard are effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. |  | The standard is effective for the Company as of January 1, 2021. The Company adopted the amendments in this update and the adoption did not have a material impact to the Company’s financial statements. Date of adoption: Q1 2021

(3) ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS
Accounts receivable consists of the following (in thousands):

| March 31, 2021 |  | December 31, 2020
Trade accounts receivable | $ | 175,277 |  |  | $ | 174,604 |
Costs in excess of billings | 27,640 |  |  | 26,915 |
Total accounts receivables | 202,917 |  |  | 201,519 |
Less allowance for doubtful accounts and contract assets | (3,319) |  |  | (3,529) |
Accounts receivable, net | $ | 199,598 |  |  | $ | 197,990 |

Refer to Note 4 "Revenue" concerning the Company's costs in excess of billings.
The following table provides a roll-forward of the allowance for credit losses, for the three month period ended March 31, 2021, that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected.

Beginning balance as of January 1, 2021 | $ | 3,529 |
Bad debt expense, net of recoveries | (159) |
Accounts written off against allowance and other adjustments | (51) |
Ending balance as of March 31, 2021 | $ | 3,319 |

(4) REVENUE
Sales includes revenue from contracts with customers for: designing, engineering, manufacturing and installation of solar racking systems and greenhouse structures; electrical balance of systems; extraction systems; roof and foundation ventilation products; centralized mail systems and electronic package solutions; rain dispersion products and roofing accessories; retractable awnings; gutter guards; expansion joints and structural bearings.
Refer to Note 15 "Segment Information" for additional information related to revenue recognized by timing of transfer of control by reportable segment.
As of March 31, 2021, the Company's remaining performance obligations are part of contracts that have an original expected duration of one year or less.
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Contract assets consist of costs in excess of billings. Contract liabilities consist of billings in excess of cost and unearned revenue. Unearned revenue as of March 31, 2021 and December 31, 2020 was $13.1 million and $21.3 million, respectively. Revenue recognized during the three months ended March 31, 2021 and 2020 that was in contract liabilities at the beginning of the respective periods was $40.7 million and $38.1 million, respectively.
(5) INVENTORIES
Inventories consist of the following (in thousands):

| March 31, 2021 |  | December 31, 2020
Raw material | $ | 73,364 |  |  | $ | 66,018 |
Work-in-process | 4,844 |  |  | 5,382 |
Finished goods | 32,757 |  |  | 31,205 |
Gross inventory | $ | 110,965 |  |  | $ | 102,605 |
Less reserves | (3,961) |  |  | (4,298) |
Total inventories, net | $ | 107,004 |  |  | $ | 98,307 |

(6) ACQUISITIONS
2020 Acquisitions
During the year ended December 31, 2020, the Company acquired five businesses in separate transactions, two of which are included within our Renewables segment, two in our Agtech segment, and one in our Residential segment. The purchase consideration for each acquisition was allocated to the assets acquired and liabilities assumed based upon their respective fair values.
On December 31, 2020, the Company purchased all the outstanding membership interests of TerraSmart LLC ("TerraSmart"), a leading provider of screw-based, ground-mount solar racking technology, particularly used for solar projects installed on challenging terrain. The results of TerraSmart have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewables segment. The preliminary purchase consideration for the acquisition of TerraSmart was $223.7 million, which includes a preliminary working capital adjustment and certain other adjustments provided for in the stock purchase agreement.
The purchase price for the TerraSmart acquisition was preliminarily allocated to the assets acquired and liabilities assumed based upon their respective fair values estimated as of the date of acquisition. The Company has commenced the process to confirm the existence, condition and completeness of the assets acquired and liabilities assumed to establish fair values of such acquired assets and assumed liabilities and to determine the amount of goodwill to be recognized as of the date of acquisition. Due to the timing of the acquisition, we continue to gather information supporting the acquired assets and assumed liabilities. Accordingly, all amounts recorded are provisional. These provisional amounts are subject to change if new information is obtained concerning facts and circumstances that existed as of the acquisition date that, if known, would have affected the measurement of the amounts recognized as of that date. The final determination of the fair value of certain assets and liabilities will be completed within a measurement period of up to one year from the date of acquisition. The final values may also result in changes to depreciation and amortization expense related to certain assets such as property, plant and equipment and acquired intangible assets. The preliminary excess consideration was recorded as goodwill and approximated $153.7 million, all of which is deductible for tax purposes. Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and increased presence in the domestic solar energy market. The final purchase price allocation will be completed no later than December 31, 2021.
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The preliminary allocation of the TerraSmart purchase consideration to the estimated fair value of the assets acquired and liabilities assumed is as follows as of the date of the acquisition (in thousands):

Cash | $ | 1,491 |
Working capital | 7,158 |
Property, plant and equipment | 9,396 |
Acquired intangible assets | 51,700 |
Other assets | 1,855 |
Other liabilities | (1,636) |
Goodwill | 153,690 |
Fair value of purchase consideration | $ | 223,654 |

The intangible assets acquired in the TerraSmart acquisition consisted of the following (in thousands):

| Fair Value |  | Weighted-Average Amortization Period
Trademarks | $ | 16,400 |  |  | Indefinite
Trademarks | 300 |  |  | 7 years
Technology | 2,500 |  |  | 15 years
Customer relationships | 24,000 |  |  | 10 years
Non-compete agreements | 2,200 |  |  | 5 years
Backlog | 6,300 |  |  | Less than 1 year
Total | $ | 51,700 |  |  |

On December 11, 2020, the Company purchased all the outstanding stock of Sunfig Corporation ("Sunfig"), a provider of software solutions that optimize solar energy investments through upstream design, performance and financial modeling, for a preliminary purchase consideration of $3.8 million, which includes a preliminary working capital adjustment and certain other adjustments provided for in the stock purchase agreement. The results of Sunfig have been included in the Company's consolidated financial results since the date of acquisition within the Company's Renewables segment. The excess consideration was recorded as goodwill and approximated $3.2 million, all of which is deductible for tax purposes.
On October 15, 2020, the Company purchased substantially all of the assets of Architectural Mailboxes LLC ("Architectural Mailboxes"), a complementary addition to the Company's existing mail and package solutions business within the Residential segment, for a preliminary purchase consideration of $26.9 million, which includes a working capital adjustment and certain other adjustments provided for in the asset purchase agreement. The results of Architectural Mailboxes have been included in the Company's consolidated financial results since the date of acquisition within the Company's Residential segment. The excess consideration was recorded as goodwill and approximated $7.4 million, all of which is deductible for tax purposes.
On February 13, 2020, the Company purchased substantially all of the assets of Delta Separations, LLC and Teaching Tech, LLC (collectively, "Delta Separations") for a purchase consideration of $47.1 million, which includes a working capital adjustment and certain other adjustments provided for in the asset purchase agreement. Delta Separations was a privately-held engineering company primarily engaged in the assembly and sale of centrifugal ethanol-based extraction systems. The results of Delta Separations have been included in the Company's consolidated financial results since the date of acquisition within the Company's Agtech segment. The excess consideration was recorded as goodwill and approximated $32.2 million, all of which is deductible for tax purposes.
On January 15, 2020, the Company purchased substantially all of the assets of Thermo Energy Systems Inc. ("Thermo"), a Canadian-based, privately held provider of commercial greenhouse solutions in North America providing growing infrastructure for the plant based organic food market, for a purchase consideration of $7.3 million. The results of Thermo have been included in the Company's consolidated financial results since the date of acquisition within the Company's Agtech segment. Goodwill of approximately $18.7 million was recorded, all of which is deductible for tax purposes.
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The preliminary allocation of the purchase price for Sunfig and Architectural Mailboxes remains subject to adjustments during the measurement period as third-party valuations are finalized. The preliminary and final allocation of the purchase consideration to the estimated fair value of the assets acquired and liabilities assumed in the acquisitions of Sunfig, Architectural Mailboxes, Delta Separations and Thermo is as follows as of the respective date of the acquisition (in thousands):

Cash | $ | 200 |  |  |
Working capital | (14,957) |  |  |
Property, plant and equipment | 1,740 |  |  |
Acquired intangible assets | 38,296 |  |  |
Other current assets | 1,528 |  |  |
Other assets | 2,381 |  |  |
Other liabilities | (5,508) |  |  |
Goodwill | 61,422 |  |  |
Fair value of purchase consideration | $ | 85,102 |  |  |

Goodwill represents future economic benefits arising from other assets acquired that could not be individually identified including workforce additions, growth opportunities, and increased presence in the respective markets.
The intangible assets acquired in the acquisitions of Sunfig, Architectural Mailboxes, Delta Separations and Thermo consisted of the following (in thousands):

| Fair Value |  | Weighted-Average Amortization Period
Trademarks | $ | 8,200 |  |  | Indefinite
Trademarks | 1,177 |  |  | 3 years
Technology | 8,175 |  |  | 7 - 15 years
Customer relationships | 18,780 |  |  | 5 - 13 years
Non-compete agreements | 1,036 |  |  | 5 years
Backlog | 928 |  |  | Less than 1 year
Total | $ | 38,296 |  |  |

In determining the allocation of the purchase price to the assets acquired and the liabilities assumed, the Company uses all available information to make fair value determinations using Level 3 unobservable inputs in which little or no market data exists, and therefore, engages independent valuation specialists to assist in the fair value determination of the acquired long-lived assets.
The acquisition of TerraSmart was financed through a combination of cash on hand and borrowings under the Company's revolving credit facility. The acquisitions of Sunfig, Architectural Mailboxes, Delta Separations and Thermo were funded from available cash on hand.
The Company incurred certain acquisition-related costs composed of legal and consulting fees. These costs were recognized as a component of selling, general, and administrative expenses in the consolidated statement of operations. During the three months ended March 31, 2021 and 2020, the Company incurred $0.9 million and $1.3 million, respectively, in acquisition-related costs. The Company did not recognize acquisition-related costs as a component of cost of sales for the three months ended March 31, 2021 and 2020, respectively.
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(7) GOODWILL AND RELATED INTANGIBLE ASSETS
Goodwill
The changes in the carrying amount of goodwill for the three months ended March 31, 2021 are as follows (in thousands):

| Renewables |  | Residential |  | Agtech |  | Infrastructure |  | Total
Balance at December 31, 2020 | $ | 192,527 |  |  | $ | 205,452 |  |  | $ | 84,622 |  |  | $ | 31,678 |  |  | $ | 514,279 |
Adjustments to prior year acquisitions | 9,951 |  |  | — |  |  | — |  |  |  |  | 9,951 |
Foreign currency translation | (989) |  |  | — |  |  | 205 |  |  | — |  |  | (784) |
Balance at March 31, 2021 | $ | 201,489 |  |  | $ | 205,452 |  |  | $ | 84,827 |  |  | $ | 31,678 |  |  | $ | 523,446 |

The Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. The Company determined that a triggering event has not occurred which would require an interim impairment test to be performed.
Acquired Intangible Assets
Acquired intangible assets consist of the following (in thousands):

| March 31, 2021 |  | December 31, 2020 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 56,670 |  |  | $ | — |  |  | $ | 56,570 |  |  | $ | — |  |  |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 5,831 |  |  | 3,574 |  |  | 5,818 |  |  | 3,385 |  |  |
Unpatented technology | 38,892 |  |  | 18,479 |  |  | 38,752 |  |  | 17,765 |  |  |
Customer relationships | 98,135 |  |  | 33,298 |  |  | 98,500 |  |  | 31,580 |  |  |
Non-compete agreements | 4,888 |  |  | 1,913 |  |  | 4,885 |  |  | 1,747 |  |  |
Backlog | 7,235 |  |  | 2,510 |  |  | 7,228 |  |  | 911 |  |  |
| 154,981 |  |  | 59,774 |  |  | 155,183 |  |  | 55,388 |  |  |
Total acquired intangible assets | $ | 211,651 |  |  | $ | 59,774 |  |  | $ | 211,753 |  |  | $ | 55,388 |  |  |

The following table summarizes the acquired intangible asset amortization expense for the three months ended March 31 (in thousands):

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Amortization expense | $ | 4,743 |  |  | $ | 1,984 |  |  |  |  |

Amortization expense related to acquired intangible assets for the remainder of fiscal 2021 and the next five years thereafter is estimated as follows (in thousands):

| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Amortization expense | $ | 14,140 |  |  | $ | 12,120 |  |  | $ | 11,195 |  |  | $ | 11,014 |  |  | $ | 10,780 |  |  | $ | 8,700 |

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(8) LONG-TERM DEBT
Long-term debt consists of the following (in thousands):

| March 31, 2021 |  | December 31, 2020
Revolving credit facility | $ | 59,000 |  |  | $ | 85,000 |
Other debt | — |  |  | 636 |
Less unamortized debt issuance costs | (977) |  |  | — |
Total debt | $ | 58,023 |  |  | $ | 85,636 |

Senior Credit Agreement
On January 24, 2019, the Company entered into a Sixth Amended and Restated Credit Agreement ("Senior Credit Agreement"), which amended and restated the Company’s Fifth Amended and Restated Credit Agreement dated December 9, 2015, and provides for a revolving credit facility and letters of credit in an aggregate amount equal to $400 million. The Company can request additional financing from the lenders to increase the revolving credit facility to $700 million or enter into a term loan of up to $300 million subject to conditions set forth in the Senior Credit Agreement. The Senior Credit Agreement contains three financial covenants. As of March 31, 2021, the Company was in compliance with all three covenants.
Interest rates on the revolving credit facility are based on LIBOR plus an additional margin that ranges from 1.125% to 2.00%. In addition, the revolving credit facility is subject to an undrawn commitment fee ranging between 0.15% and 0.25% based on the Total Leverage Ratio (as defined in the Senior Credit Agreement) and the daily average undrawn balance. The Senior Credit Agreement terminates on January 23, 2024.
Borrowings under the Senior Credit Agreement are secured by the trade receivables, inventory, personal property, equipment, and general intangibles of the Company’s significant domestic subsidiaries.
Standby letters of credit of $6.2 million have been issued under the Senior Credit Agreement on behalf of the Company as of March 31, 2021. These letters of credit reduce the amount otherwise available under the revolving credit facility. The Company had $334.8 million and $309.2 million of availability under the revolving credit facility at March 31, 2021 and December 31, 2020, respectively.
(9) ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
The following tables summarize the cumulative balance of each component of accumulated other comprehensive loss, net of tax, for the three months ended March 31, (in thousands):

| Foreign Currency Translation Adjustment |  | Minimum post retirement benefit plan adjustments |  | Total Pre-Tax Amount |  | Tax (Benefit) Expense |  | Accumulated Other Comprehensive (Loss) Income |  |
Balance at December 31, 2020 | $ | (872) |  |  | $ | (2,426) |  |  | $ | (3,298) |  |  | $ | (837) |  |  | $ | (2,461) |  |  |
Minimum post retirement health care plan adjustments | — |  |  | 37 |  |  | 37 |  |  | 10 |  |  | 27 |  |  |
Foreign currency translation adjustment | 3,198 |  |  | — |  |  | 3,198 |  |  | — |  |  | 3,198 |  |  |
Balance at March 31, 2021 | $ | 2,326 |  |  | $ | (2,389) |  |  | $ | (63) |  |  | $ | (827) |  |  | $ | 764 |  |  |

| Foreign Currency Translation Adjustment |  | Minimum post retirement benefit plan adjustments |  | Total Pre-Tax Amount |  | Tax (Benefit) Expense |  | Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2019 | $ | (4,173) |  |  | $ | (1,939) |  |  | $ | (6,112) |  |  | $ | (721) |  |  | $ | (5,391) |
Minimum post retirement health care plan adjustments | — |  |  | 25 |  |  | 25 |  |  | 7 |  |  | 18 |
Foreign currency translation adjustment | (5,898) |  |  | — |  |  | (5,898) |  |  | — |  |  | (5,898) |
Balance at March 31, 2020 | $ | (10,071) |  |  | $ | (1,914) |  |  | $ | (11,985) |  |  | $ | (714) |  |  | $ | (11,271) |

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The realized adjustments relating to the Company’s minimum post retirement health care costs were reclassified from accumulated other comprehensive loss and included in other expense in the consolidated statements of income.
(10) EQUITY-BASED COMPENSATION
On May 4, 2018, the stockholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2018 Equity Incentive Plan (the "2018 Plan"). The 2018 Plan provides for the issuance of up to 1,000,000 shares of common stock and supplements the remaining shares available for issuance under the Gibraltar Industries, Inc. 2015 Equity Incentive Plan (the "2015 Plan"). Both the 2018 Plan and the 2015 Plan allow the Company to grant equity-based incentive compensation awards, in the form of non-qualified options, restricted shares, restricted stock units, performance shares, performance stock units, and stock rights to eligible participants.
In 2016, the stockholders of the Company approved the adoption of the Gibraltar Industries, Inc. 2016 Stock Plan for Non-Employee Directors ("Non-Employee Directors Plan") which allows the Company to grant awards of shares of the Company's common stock to non-employee Directors of the Company and permits the Directors to defer receipt of such shares pursuant to the terms of the Non-Employee Directors Plan.
Equity Based Awards - Settled in Stock
The following table sets forth the number of equity-based awards granted during the three months ended March 31, which will convert to shares upon vesting, along with the weighted average grant date fair values:

| 2021 |  | 2020
Awards | Number of Awards |  | Weighted Average Grant Date Fair Value |  | Number of Awards (2) |  | Weighted Average Grant Date Fair Value
Performance stock units (1) | 62,778 |  |  | $ | 87.84 |  |  | 123,870 |  |  | $ | 53.29 |
Restricted stock units | 33,187 |  |  | $ | 87.91 |  |  | 42,101 |  |  | $ | 52.31 |

(1) The Company’s performance stock units (“PSUs”) represent shares granted for which the final number of shares earned depends on financial performance or market conditions. The number of shares to be issued may vary between 0% and 200% of the number of performance stock units granted depending on the relative achievement to targeted thresholds. The Company's PSUs with a financial performance condition are based on either the Company’s return on invested capital (“ROIC”) over a one-year performance period or revenue, gross profit and operating profit thresholds over a twoc or three-year performance period. The Company's PSUs with a market condition are based on the ranking of the Company’s total stockholder return (“TSR”) performance, on a percentile basis, over a three year performance period compared to the S&P Small Cap Industrial sector, over the same three year performance period.
(2) PSUs granted in the first quarter of 2020 include 72,239 units that will be converted to shares and issued to recipients in the first quarter of 2023 at 109.5% of the target amount granted, based on the Company’s actual ROIC compared to ROIC target for the performance period ended December 31, 2020.
Equity Based Awards - Settled in Cash
The Company's equity-based liability is comprised of awards under a management stock purchase plan. As of March 31, 2021, the Company's total share-based liabilities recorded on the consolidated balance sheet were $19.3 million, of which $16.4 million was included in non-current liabilities. The share-based liabilities as of December 31, 2020 were $18.2 million, of which $14.7 million was included in non-current liabilities.
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The Management Stock Purchase Plan ("MSPP") provides participants the ability to defer a portion of their compensation, convertible to unrestricted investments, restricted stock units, or a combination of both, or defer a portion of their directors’ fees, convertible to restricted stock units. Employees eligible to defer a portion of their compensation also receive a company-matching award in restricted stock units equal to a percentage of their compensation.
The deferrals and related company match are credited to an account that represents a share-based liability. The portion of the account deferred to unrestricted investments is measured at fair market value of the unrestricted investments, and the portion of the account deferred to restricted stock units and company-matching restricted stock units is measured at a 200-day average of the Company’s stock price. The account will be converted to and settled in cash payable to participants upon retirement or a termination of their service to the Company.
The following table provides the number of restricted stock units credited to active participant accounts and the payments made with respect to restricted stock units issued under the MSPP during the three months ended March 31,:

| 2021 |  | 2020
Restricted stock units credited | 24,085 |  |  | 52,411 |
Share-based liabilities paid (in thousands) | $ | 3,510 |  |  | $ | 4,433 |

(11) DISCONTINUED OPERATIONS
On February 23, 2021, the Company sold the stock of its Industrial business which had been classified as held for sale and reported as a discontinued operation in the Company’s consolidated financial statements for the year ended December 31, 2020. Net proceeds of $38 million, consisting of cash and a $13 million seller note, resulted in an estimated pre-tax loss of $30 million, subject to working capital and other adjustments, of which $29.6 million was recorded when the assets of the Industrial business were written down to fair market value during the fourth quarter of 2020.
The results of operations and financial position of the Industrial business have been presented as a discontinued operation in the Company's consolidated financial statements for all periods presented. The Company allocates interest to its discontinued operations in accordance with ASC Subtopic 205-20, “Presentation of Financial Statements – Discontinued Operations.” Interest was allocated based on the amount of net assets held by the discontinued operation in comparison to consolidated net assets.
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The following carrying amounts of the major classes of assets and liabilities included in discontinued operations related to the Industrial business has been segregated from the Company's continuing operations and are reported as assets and liabilities of discontinued operations, respectively, in the consolidated balance sheet at December 31, 2020 (in thousands):

| December 31, 2020 |  |  |  |
Assets |  |  |  |  |
Accounts receivable, net | $ | 11,261 |  |  |  |  |
Inventories, net | 13,041 |  |  |  |  |
Prepaid expenses and other current assets | 21,310 |  |  |  |  |
Total current assets (1) | 45,612 |  |  |  |  |
Property, plant, and equipment, net | 16,999 |  |  |  |  |
Operating lease assets | 6,470 |  |  |  |  |
Goodwill | 22,475 |  |  |  |  |
Acquired intangibles | 15,482 |  |  |  |  |
Loss recognized on classification as held for sale | (29,600) |  |  |  |  |
Total noncurrent assets (1) | 31,826 |  |  |  |  |
Total assets classified as held for sale | $ | 77,438 |  |  |  |  |
Liabilities |  |  |  |  |
Accounts payable | $ | 10,708 |  |  |  |  |
Accrued expenses | 9,274 |  |  |  |  |
Total current liabilities (1) | 19,982 |  |  |  |  |
Deferred income taxes | 24,657 |  |  |  |  |
Non-current operating lease liabilities | 4,639 |  |  |  |  |
Other non-current liabilities | 17 |  |  |  |  |
Total noncurrent liabilities (1) | 29,313 |  |  |  |  |
Total liabilities classified as held for sale | $ | 49,295 |  |  |  |  |

(1) The assets and liabilities of the discontinued operations were classified as current on the December 31, 2020 consolidated balance sheet, as it was probable that the sale would occur and proceeds will be collected within one year.
Components of income from discontinued operations before taxes, including the interest allocated to discontinued operations, for the three months ended March 31 are as follows (in thousands):

| 2021 |  | 2020 |  |  |  |
Net sales | $ | 20,391 |  |  | $ | 34,038 |  |  |  |  |
Operating expenses | 17,493 |  |  | 31,202 |  |  |  |  |
Adjustment to loss on disposal | 328 |  |  | — |  |  |  |  |
Interest expense allocation | — |  |  | 6 |  |  |  |  |
Income from discontinued operations before taxes | $ | 2,570 |  |  | $ | 2,830 |  |  |  |  |

(12) EXIT ACTIVITY COSTS AND ASSET IMPAIRMENTS
The Company has incurred exit activity costs and asset impairment charges as a result of its 80/20 simplification and portfolio management initiatives. These initiatives have resulted in the identification of low-volume, low margin, internally-produced products which have been or will be outsourced or discontinued, the simplification of processes, the sale and exiting of less profitable businesses or product lines, and a reduction in our manufacturing footprint.
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Exit activity costs were incurred during the three months ended March 31, 2021 which related to moving and closing costs, contract terminations, and severance, along with asset impairment charges related to the write-down of inventory and impairment of machinery and equipment associated with discontinued product lines, as a result of process simplification initiatives. In conjunction with these initiatives, the Company closed two facilities during the three months ended March 31, 2021. Exit activity costs were incurred from the above initiatives for the three months ended March 31, 2020. No facilities were closed as a result of these initiatives during the three months ended March 31, 2020.
The following tables set forth the asset impairment charges and exit activity costs incurred by segment during the three months ended March 31, related to the restructuring activities described above (in thousands):

| Three months ended March 31,
| 2021 |  | 2020
| Asset impairment charges |  | Exit activity costs (recoveries), net |  | Total |  | Asset impairment charges |  | Exit activity costs |  | Total
Renewables | $ | 1,193 |  |  | $ | 3,778 |  |  | $ | 4,971 |  |  | $ | — |  |  | $ | 18 |  |  | $ | 18 |
Residential | — |  |  | 65 |  |  | 65 |  |  | — |  |  | 221 |  |  | 221 |
Agtech | — |  |  | 204 |  |  | 204 |  |  | — |  |  | — |  |  | — |
Infrastructure | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Corporate | — |  |  | — |  |  | — |  |  | — |  |  | 54 |  |  | 54 |
Total exit activity costs & asset impairments | $ | 1,193 |  |  | $ | 4,047 |  |  | $ | 5,240 |  |  | $ | — |  |  | $ | 293 |  |  | $ | 293 |

The following table provides a summary of where the asset impairments and exit activity costs were recorded in the consolidated statements of income for the three months ended March 31, (in thousands):

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Cost of sales | $ | 5,047 |  |  | $ | 69 |  |  |  |  |
Selling, general, and administrative expense | 193 |  |  | 224 |  |  |  |  |
Total asset impairment and exit activity charges | $ | 5,240 |  |  | $ | 293 |  |  |  |  |

The following table reconciles the beginning and ending liability for exit activity costs relating to the Company’s facility consolidation efforts (in thousands):

| 2021 |  | 2020
Balance at January 1 | $ | 1,030 |  |  | $ | 2,083 |
Exit activity costs recognized | 4,047 |  |  | 293 |
Cash payments | (1,464) |  |  | (1,365) |
Balance at March 31 | $ | 3,613 |  |  | $ | 1,011 |

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(13) INCOME TAXES
The following table summarizes the provision for income taxes for continuing operations (in thousands) for the three months ended March 31, and the applicable effective tax rates:

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Provision for income taxes | $ | 1,560 |  |  | $ | 2,313 |  |  |  |  |
Effective tax rate | 12.9 | % |  | 18.9 | % |  |  |  |

The effective tax rate for the three months ended March 31, 2021 and 2020, respectively, was less than the U.S. federal statutory rate of 21% due to favorable discrete items due to an excess tax benefit on stock-based compensation, partially offset by state taxes and nondeductible permanent differences.
(14) EARNINGS PER SHARE
Basic earnings and weighted-average of diluted shares outstanding are as follows for the three months ended March 31, (in thousands):

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Numerator: |  |  |  |  |  |  |
Income from continuing operations | $ | 10,496 |  |  | $ | 9,902 |  |  |  |  |
Income from discontinued operations | 2,266 |  |  | 2,157 |  |  |  |  |
Net income available to common stockholders | $ | 12,762 |  |  | $ | 12,059 |  |  |  |  |
Denominator for basic earnings per share: |  |  |  |  |  |  |
Weighted average shares outstanding | 32,771 |  |  | 32,586 |  |  |  |  |
Denominator for diluted earnings per share: |  |  |  |  |  |  |
Weighted average shares outstanding | 32,771 |  |  | 32,586 |  |  |  |  |
Common stock options and stock units | 333 |  |  | 297 |  |  |  |  |
Weighted average shares and conversions | 33,104 |  |  | 32,883 |  |  |  |  |

The weighted average number of diluted shares does not include potential anti-dilutive common shares issuable pursuant to equity based incentive compensation awards. There were no anti-dilutive shares outstanding for the three months ended March 31, 2021 and 18,000 for the three months ended March 31, 2020.
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(15) SEGMENT INFORMATION
The Company is organized into four reportable segments on the basis of the production processes, products and services provided by each segment, identified as follows:
(i)Renewables, which primarily includes designing, engineering, manufacturing and installation of solar racking and electrical balance of systems;
(ii)Residential, which primarily includes roof and foundation ventilation products, centralized mail systems and electronic package solutions, retractable awnings and gutter guards, and rain dispersion products, trims and flashings and other accessories;
(iii)Agtech, which provides growing and processing solutions including the designing, engineering, manufacturing and installation of greenhouses, and botanical extraction systems; and
(iv)Infrastructure, which primarily includes structural bearings, expansion joints and pavement sealant for bridges, airport runways and roadways, elastomeric concrete, and bridge cable protection systems.
When determining the reportable segments, the Company aggregated operating segments based on their similar economic and operating characteristics. During the first quarter of 2021, the Company reassessed its reportable segments. As a result, the Company's former Renewable Energy and Conservation segment was divided into two reportable segments: Renewables and Agtech.
The following table illustrates certain measurements used by management to assess performance of the segments described above for the three months ended March 31, (in thousands):

| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Net sales: |  |  |  |  |  |  |
Renewables | $ | 85,512 |  |  | $ | 47,263 |  |  |  |  |
Residential | 140,217 |  |  | 103,419 |  |  |  |  |
Agtech | 46,739 |  |  | 49,234 |  |  |  |  |
Infrastructure | 15,124 |  |  | 15,485 |  |  |  |  |
Total net sales | $ | 287,592 |  |  | $ | 215,401 |  |  |  |  |
Income from operations: |  |  |  |  |  |  |
Renewables | $ | (521) |  |  | $ | 4,359 |  |  |  |  |
Residential | 22,934 |  |  | 13,725 |  |  |  |  |
Agtech | 929 |  |  | 1,340 |  |  |  |  |
Infrastructure | 2,037 |  |  | 1,576 |  |  |  |  |
Unallocated Corporate Expenses | (12,564) |  |  | (8,223) |  |  |  |  |
Total income from operations | $ | 12,815 |  |  | $ | 12,777 |  |  |  |  |

| March 31, 2021 |  | December 31, 2020
Total assets: |  |  |
Renewables | $ | 393,499 |  |  | $ | 402,796 |
Residential | 427,894 |  |  | 407,132 |
Agtech | 212,507 |  |  | 216,275 |
Infrastructure | 82,833 |  |  | 80,796 |
Unallocated corporate assets | 38,458 |  |  | 28,057 |
Assets of discontinued operations | — |  |  | 77,438 |
| $ | 1,155,191 |  |  | $ | 1,212,494 |

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The following tables illustrate segment revenue disaggregated by timing of transfer of control to the customer for the three months ended March 31 (in thousands):

| Three Months Ended March 31, 2021
| Renewables |  | Residential |  | Agtech |  | Infrastructure |  | Total
Net sales: |  |  |  |  |  |  |  |  |
Point in Time | 6,971 |  |  | 139,019 |  |  | 5,143 |  |  | 5,470 |  |  | $ | 156,603 |
Over Time | 78,541 |  |  | 1,198 |  |  | 41,596 |  |  | 9,654 |  |  | 130,989 |
Total net sales | $ | 85,512 |  |  | $ | 140,217 |  |  | $ | 46,739 |  |  | $ | 15,124 |  |  | $ | 287,592 |

| Three Months Ended March 31, 2020
| Renewables |  | Residential |  | Agtech |  | Infrastructure |  | Total
Net sales: |  |  |  |  |  |  |  |  |
Point in Time | $ | 3,696 |  |  | $ | 102,331 |  |  | $ | 14,096 |  |  | $ | 5,457 |  |  | $ | 125,580 |
Over Time | 43,567 |  |  | 1,088 |  |  | 35,138 |  |  | 10,028 |  |  | 89,821 |
Total net sales | $ | 47,263 |  |  | $ | 103,419 |  |  | $ | 49,234 |  |  | $ | 15,485 |  |  | $ | 215,401 |

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Certain information set forth herein includes statements that express our opinions, expectations, beliefs, plans, objectives, assumptions or projections regarding future events or future results and, therefore are, or may be deemed to be, “forward-looking statements.” These forward-looking statements can generally be identified by the use of forward-looking terminology, including the terms “believes,” “anticipates,” "aspires," “expects,” “estimates,” “seeks,” “projects,” “intends,” “plans,” “may,” “will” or “should” or, in each case, their negative or other variations or comparable terminology. These forward-looking statements include all matters that are not historical facts. They include statements regarding our intentions, beliefs or current expectations concerning, among other things, our results of operations, financial condition, liquidity, prospects, growth, competition, strategies and the industries in which we operate. By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that may or may not occur in the future. We believe that these risks and uncertainties include, but are not limited to, those described in the “Risk Factors” disclosed in our Annual Report on Form 10-K along with Item 1A of this Form 10-Q. Although we base these forward-looking statements on assumptions that we believe are reasonable when made, we caution you that forward-looking statements are not guarantees of future performance and that our actual results of operations, financial condition, liquidity and the development of the industries in which we operate may differ materially from those made in or suggested by the forward-looking statements contained herein. In addition, even if our results of operations, financial condition, liquidity, and the development of the industries in which we operate are consistent with the forward-looking statements contained in this quarterly report, those results or developments may not be indicative of results or developments in subsequent periods. Given these risks and uncertainties, you are cautioned not to place undue reliance on these forward-looking statements. Any forward-looking statements that we make herein speak only as of the date of those statements, and we undertake no obligation to update those statements or to publicly announce the results of any revisions to any of those statements to reflect future events or developments. Comparisons of results for current and any prior periods are not intended to express any future trends or indications of future performance, unless expressed as such, and should only be viewed as historical data.
We use certain operating performance measures, specifically consolidated gross margin, operating margin by segment and consolidated operating margin, to manage our businesses, set operational goals, and establish performance targets for incentive compensation for our employees. We define consolidated gross margin as a percentage of total consolidated gross profit to total consolidated net sales. We define operating margin by segment as a percentage of total income from operations by segment to total net sales by segment and consolidated operating margin as a percentage of total consolidated income from operations to total consolidated net sales. We believe consolidated gross margin, operating margin and consolidated operating margin may be useful to investors in evaluating the profitability of our segments and Company on a consolidated basis.
Overview
Gibraltar Industries, Inc. (the "Company") is a leading manufacturer and provider of products and services for the renewable energy, residential, agtech, and infrastructure markets.
The Company operates and reports its results in the following four reporting segments:
•Renewables;
•Residential;
•Agtech; and
•Infrastructure.
The Company serves customers primarily in North America including renewable energy (solar) developers, home improvement retailers, wholesalers, distributors, institutional and commercial growers of food and plants, and contractors. As part of our continuing operations at March 31, 2021, we operated 36 facilities, comprised of 26 manufacturing facilities, one distribution center, and nine offices, which are located in 16 states, Canada, China, and Japan. Our operational infrastructure provides the necessary scale to support local, regional, and national customers in each of our markets.
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COVID-19 Update
While the Company continues to encounter challenges and uncertainty associated with COVID-19, the pandemic did not have a material adverse effect on our reported results during the first quarter of 2021. Our top priority continues to be focused on our organization - keeping our team and their families as safe as possible, maintaining the timely and effective functioning of our supply chain operating and providing a high level of responsiveness to customer needs. We continue to proactively execute our pandemic “playbook” in 2021 and make adjustments to our operating protocols as we navigate forward. The extent to which our operations will be impacted by the outbreak, including but not limited to the current impact of supply chain, transportation and labor challenges, along with new requirements or regulations mandated by government authorities, remains uncertain and challenging to predict, Refer to the Company's Outlook section in this management discussion and analysis for consideration relative to future periods.
Business Strategy
The Company's mission is to create compounding and sustainable value for our stockholders and other stakeholders with strong and relevant leadership positions in higher growth, profitable end markets focused on addressing some of the world's most challenging opportunities. The foundation of the Company's strategy is built on three core pillars: Business System, Portfolio Management, and Organization Development.
1.Business System reflects the necessary systems, processes, and management tools required to deliver consistent and continuous performance improvement, every day. Our Business System is a critical enabler to grow, scale, and deliver our plans. Our Business System is focused on deploying effective tools to drive growth, improve operating performance, and develop the organization. Our Business System challenges existing paradigms, drives day-to-day performance, forces prioritization of resources, challenges our business models, and brings focus to new product and services development and innovation.
2.Portfolio Management is focused on optimizing the Company’s business portfolio and ensures our financial capital and human resources are effectively and efficiently deployed to deliver sustainable, profitable growth while increasing our relevance with customers and shaping our markets. For a description of recent portfolio management activities, see the actions described below in the Recent Developments section.
3.Organization Development drives the Company’s continuous focus on strengthening and scaling the organization to execute the Company’s plans and meet commitments. The Company aspires to make our place of work the "Best Place to Work", where we focus on creating an environment for our people to have the best opportunity for success, continue to develop, grow, and learn. At core of this pillar is the Company’s development process focused on helping employees reach their potential, improve performance, develop career roadmaps, identify ongoing education requirements, and respective succession plans. We believe doing so helps us attract and retain the best people so we can execute our business plans.
We believe the key elements of our strategy have, and will continue to, enable us to respond timely to changes in the end markets we serve, including evolving changes due to COVID-19 and the challenges noted above. We have and expect to continue to examine the need for restructuring of our operations, including consolidation of facilities, reducing overhead costs, curtailing investments in inventory, and managing our business to generate incremental cash. We believe our enhanced strategy has enabled us to better react to volatility in commodity costs and fluctuations in customer demand, along with helping to improve margins. We have used the improved cash flows generated by these initiatives to pay down debt, improve our liquidity position, and invest in growth initiatives. Overall, we continue to strive to achieve stronger financial results, make more efficient use of capital, and deliver higher stockholder returns.
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Recent Developments
During the first quarter of 2021, the Company sold its Industrial business as a result of its Portfolio Management strategy to focus on participation in higher value and faster growing markets. The Industrial business, previously reported in the Company's Industrial and Infrastructure Products segment, was reported as discontinued operations as of December 31, 2020.
During 2020, the Company completed the following acquisitions:

Business Acquired | Date of Acquisition in 2020 | Purchase price ( in millions) 1 | Description
TerraSmart LLC | December 31 | $ | 223.7 |  | Provider of screw-based, ground-mount solar racking technology, particularly used for solar projects installed on challenging terrain
Sunfig Corporation | December 11 | $ | 3.8 |  | Provider of software solutions that optimize solar energy investments through upstream design, performance and financial modeling
Architectural Mailboxes | October 15 | $ | 26.9 |  | Provider, designer, and developer of decorative residential mailboxes and related products
Delta Separations | February 13 | $ | 47.1 |  | Provider of ethanol-based extraction systems manufacturer and training and laboratory design and operations consultative partner
Thermo Energy Systems | January 15 | $ | 7.3 |  | Provider of commercial greenhouse solutions in North America supporting the biologically grown organic food market

Note 1: Except for TerraSmart, which was financed through a combination of cash on hand and borrowings under the Company's revolving credit facility, all of the above 2020 acquisitions were funded from cash on hand. The purchase price for the acquisitions of TerraSmart, Sunfig, and Architectural Mailboxes represents the preliminary allocation to the assets acquired and liabilities assumed in each transaction. The purchase price shown above for Delta and Thermo represents the final purchase price in each transaction.
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Results of Operations
Three Months Ended March 31, 2021 Compared to the Three Months Ended March 31, 2020
The following table sets forth selected results of operations data and its percentage of net sales for the three months ended March 31 (in thousands):

| 2021 |  | 2020
Net sales | $ | 287,592 |  |  | 100.0 | % |  | $ | 215,401 |  |  | 100.0 | %
Cost of sales | 227,574 |  |  | 79.1 | % |  | 165,540 |  |  | 76.9 | %
Gross profit | 60,018 |  |  | 20.9 | % |  | 49,861 |  |  | 23.1 | %
Selling, general, and administrative expense | 47,203 |  |  | 16.4 | % |  | 37,084 |  |  | 17.2 | %
Income from operations | 12,815 |  |  | 4.5 | % |  | 12,777 |  |  | 5.9 | %
Interest expense | 444 |  |  | 0.2 | % |  | 44 |  |  | 0.0 | %
Other expense | 315 |  |  | 0.1 | % |  | 518 |  |  | 0.2 | %
Income before taxes | 12,056 |  |  | 4.2 | % |  | 12,215 |  |  | 5.7 | %
Provision for income taxes | 1,560 |  |  | 0.6 | % |  | 2,313 |  |  | 1.1 | %
Income from continuing operations | 10,496 |  |  | 3.6 | % |  | 9,902 |  |  | 4.6 | %
Income from discontinued operations | 2,266 |  |  | 0.8 | % |  | 2,157 |  |  | 1.0 | %
Net income | $ | 12,762 |  |  | 4.4 | % |  | $ | 12,059 |  |  | 5.6 | %

The following table sets forth the Company’s net sales by reportable segment for the three months ended March 31, (in thousands):

|  |  |  |  |  |  |  |  | Change due to
| 2021 |  | 2020 |  | Total Change |  |  |  | Acquisitions |  | Operations
Net sales: |  |  |  |  |  |  |  |  |  |  |
Renewables | $ | 85,512 |  |  | $ | 47,263 |  |  | $ | 38,249 |  |  |  |  | $ | 37,256 |  |  | $ | 993 |
Residential | 140,217 |  |  | 103,419 |  |  | 36,798 |  |  |  |  | 8,734 |  |  | 28,064 |
Agtech | 46,739 |  |  | 49,234 |  |  | (2,495) |  |  |  |  | 4,600 |  |  | (7,095) |
Infrastructure | 15,124 |  |  | 15,485 |  |  | (361) |  |  |  |  | — |  |  | (361) |
Consolidated | $ | 287,592 |  |  | $ | 215,401 |  |  | $ | 72,191 |  |  |  |  | $ | 50,590 |  |  | $ | 21,601 |

Consolidated net sales increased by $72.2 million, or 33.5%, to $287.6 million for the three months ended March 31, 2021 compared to the three months ended March 31, 2020. The 33.5% increase in revenue was driven by the Renewables and Residential segments. Sales generated from our prior year acquisitions of TerraSmart, Thermo, Delta Separations and Architectural Mailboxes contributed 23.5%, or $50.6 million to the growth from the prior year quarter. The $21.6 million, or 10.0% increase, in organic growth during the current year quarter was primarily the result of increased volume in both our Residential and Renewables segments, which more than offset the organic volume declines in both our Agtech and our Infrastructure segments.
Net sales in our Renewables segment increased $38.2 million, or 80.8%, to $85.5 million for the three months ended March 31, 2021 compared to $47.3 million for the three months ended March 31, 2020. Sales generated from the prior year acquisition of TerraSmart of $37.3 million, primarily contributed to the increase in the current year quarter. Organic revenue increased 2.1% during the quarter as strong execution on continued demand for solar solutions was partially offset by projects impacted by the pandemic-related scheduling delays, inclement weather, ongoing supply chain dynamics including reduced customers' access to solar panels, as well as, a decline in safe-harbor related demand due to the extension of the investment tax credit in late 2020. Backlog improved 138% year over year, or 23% on an organic basis for this segment.
Net sales in our Residential segment increased 35.6%, or $36.8 million, to $140.2 million for the three months ended March 31, 2021 compared to $103.4 million for the three months ended March 31, 2020. The increase from the prior year quarter was largely due to continued strong activity across all residential businesses along with
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participation gains across that offset challenges from inclement weather, supply chain dynamics. Sales from the prior year acquisition of Architectural Mailboxes also contributed $8.7 million to the increase in the current year quarter.
Net sales in our Agtech segment decreased 5.1%, or $2.5 million, to $46.7 million for the three months ended March 31, 2021 compared to $49.2 million for the three months ended March 31, 2020. Organic revenue decreased $7.1 million, impacted by the pandemic, inclement weather, supply chain dynamics, along with slower but improving market conditions for greenhouse structure and processing extraction equipment serving the cannabis and hemp markets. Partially offsetting these impacts was continued growth and momentum in the produce market. Sales generated from Thermo and Delta Separations acquired in the first quarter of 2020, contributed $4.6 million, partially offsetting the decrease in this segment. While backlog decreased 12% year over year, due to the 2020 slowdown in the cannabis and hemp markets, which are improving but not fully recovered, sequentially, backlog increased 5% due primarily to strength in the produce business offsetting the impact of the slower demand in the cannabis and hemp markets.
Net sales in our Infrastructure segment decreased 2.6%, or $0.4 million, to $15.1 million for the three months ended March 31, 2021 compared to $15.5 million for the three months ended March 31, 2020. While revenue was down modestly driven by delays in customer delivery schedules related to the timing of state and federal funding, backlog remained strong increasing 15% compared to the prior year quarter.
Our consolidated gross margin decreased to 20.9% for the three months ended March 31, 2021 compared to 23.1% for the three months ended March 31, 2020. This decrease was partly the result of costs incurred during the current year quarter related to the planned discontinuation of our organic solar tracker solution as we migrate towards the solution offered by our recently acquired TerraSmart business. Additionally, lower gross margins generated from our recent acquisitions contributed to the decline as we continue to integrate them operationally. Partially offsetting the decrease was improved operating execution in all our core businesses compared to the prior year quarter.
Selling, general, and administrative ("SG&A") expenses increased by $10.1 million, or 27.3%, to $47.2 million for the three months ended March 31, 2021 from $37.1 million for the three months ended March 31, 2020. The $10.1 million increase was primarily due to $5.5 million of incremental SG&A expenses recorded quarter over quarter for our recent acquisitions and transaction costs to complete those acquisitions, along with $3.3 million of higher performance-based compensation expenses as compared to the prior year quarter. Despite the above increases, SG&A expenses as a percentage of net sales decreased to 16.4% for the three months ended March 31, 2021 compared to 17.2% for the three months ended March 31, 2020.
The following table sets forth the Company’s income from operations and income from operations as a percentage of net sales by reportable segment for the three months ended March 31, (in thousands):

| 2021 |  | 2020 |  | Total Change |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewables | $ | (521) |  |  | (0.6) | % |  | $ | 4,359 |  |  | 9.2 | % |  | $ | (4,880) |  |  |  |  |  |  |  |  |
Residential | 22,934 |  |  | 16.4 | % |  | 13,725 |  |  | 13.3 | % |  | 9,209 |  |  |  |  |  |  |  |  |
Agtech | 929 |  |  | 2.0 | % |  | 1,340 |  |  | 2.7 | % |  | (411) |  |  |  |  |  |  |  |  |
Infrastructure | 2,037 |  |  | 13.5 | % |  | 1,576 |  |  | 10.2 | % |  | 461 |  |  |  |  |  |  |  |  |
Unallocated Corporate Expenses | (12,564) |  |  | (4.4) | % |  | (8,223) |  |  | (3.8) | % |  | (4,341) |  |  |  |  |  |  |  |  |
Consolidated income from operations | $ | 12,815 |  |  | 4.5 | % |  | $ | 12,777 |  |  | 5.9 | % |  | $ | 38 |  |  |  |  |  |  |  |  |

The Renewables segment generated an operating margin of (0.6)% in the current year quarter compared to 9.2% in the prior year quarter. The decrease in operating margin was the combined result of costs incurred during the current year quarter related to the discontinuation of our organic solar tracker solution along with expected lower margins generated by our recent acquisitions, the result of backlog amortization and integration costs, as we continue to integrate them operationally. Partially offsetting the lower margin is improvement in our core business resulting from continued strong execution in our manufacturing facilities and field operations and diligent price to cost management initiatives. Our acquisition integration plans remain on schedule and we expect to see margins expand during 2021.
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The Residential segment generated an operating margin of 16.4% in the current year quarter compared to 13.3% in the prior year quarter. The increase in operating margin was the result of volume leverage, solid management of price to input costs, and continued benefits from 80/20 simplification initiatives offsetting higher costs for materials, labor and logistics management challenges incurred during the current year quarter.
Our Agtech segment generated an operating margin of 2.0% during the three months ended March 31, 2021 compared to 2.7% during the three months ended March 31, 2020. The decrease in operating margin was the combined result of the continued slower greenhouse structures and processing equipment market for cannabis and hemp that impacted mix in the quarter. Integration of Thermo continues to be impacted by the closure of the US Canadian border. We have completed the bulk of those lower margin projects that we acquired, substantially completed the integration of the processing businesses, and expect to see margins expand throughout the course of 2021.
Our Infrastructure segment generated an operating margin of 13.5% during the three months ended March 31, 2021 compared to 10.2% during the three months ended March 31, 2020. The increase resulted from continued strong execution in our fabricated products sales along with higher margin mix resulting from increased non-fabricated product volumes.
Unallocated corporate expenses increased $4.3 million from $8.2 million during the three months ended March 31, 2020 to $12.6 million during the three months ended March 31, 2021. The increase in expense was primarily the result of $2.9 million of higher performance-based compensation expenses as compared to the prior year quarter.
Interest expense of $0.4 million for the three months ended March 31, 2021 was primarily the result of outstanding balances on the Company's revolving credit facility during the quarter, of which $58.0 million was outstanding as of March 31, 2021. Interest expense incurred for the three months ended March 31, 2020 was negligible. No amounts were outstanding under our revolving credit facility during the three months ended March 31, 2020.
We recognized a provision for income taxes of $1.6 million and $2.3 million, with effective tax rates of 12.9% and 18.9% for the three months ended March 31, 2021, and 2020, respectively. The effective tax rates for the three months ended March 31, 2021 and 2020, respectively, were lower than the U.S. federal statutory rate of 21% due to favorable discrete items due to an excess tax benefit on stock-based compensation, partially offset by state taxes and nondeductible permanent differences.
Outlook
While we have solid end market demand and strong order backlog, general market challenges remain including but not limited to the pandemic, general inflation, labor availability, and supply chain dynamics .We will remain focused on execution, continue to work on our businesses, and use our strong balance sheet to invest in both organic and inorganic initiatives.
The Company is maintaining its full year guidance of revenues in the range of $1.30 billion and $1.35 billion, up from $1.03 billion in 2020 and GAAP EPS between $2.78 and $2.95, compared with $2.53 in 2020.
Liquidity and Capital Resources
Our principal capital requirements are to fund our operations' working capital and capital improvements and to provide capital for acquisitions. We will continue to invest in growth opportunities as appropriate while focusing on working capital efficiency and profit improvement opportunities to minimize the cash invested to operate our business. The following table sets forth our liquidity position as of:

(in thousands) |  | March 31, 2021 |  | December 31, 2020
Cash and cash equivalents |  | $ | 20,731 |  |  | $ | 32,054 |
Availability on revolving credit facility |  | 334,780 |  |  | 309,175 |
|  | $ | 355,511 |  |  | $ | 341,229 |

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We believe that our cash on hand and available borrowing capacity provided under our Sixth Amended and Restated Credit Agreement (the "Senior Credit Agreement") provide us with ample liquidity and capital resources to weather the economic impacts of the COVID-19 pandemic while continuing to invest in operational excellence, growth initiatives and the development of our organization. After pausing in early 2020 as the COVID-19 pandemic unfolded, we continued with our strategic initiatives to invest in opportunities that strengthen our business platforms for the markets we serve through the acquisitions of Architectural Mailboxes, Sunfig and TerraSmart in the fourth quarter of 2020. We continue to remain focused on managing our working capital, closely monitoring customer credit and collection activities, and working to extend payment terms. We believe our liquidity, together with the cash expected to be generated from operations, should be sufficient to fund working capital needs and growth initiatives.
Our Senior Credit Agreement provides us with liquidity and capital resources for use by our U.S. operations. Historically, our foreign operations have generated cash flow from operations sufficient to invest in working capital and fund their capital improvements. As of March 31, 2021, our foreign subsidiaries held $15.2 million of cash in U.S. dollars.
During 2020, we opted to defer remittance of the employer portion of Social Security tax as provided in the Coronavirus, Aid, Relief and Economic Security Act ("CARES Act"), which allowed us to retain $4.4 million in cash during 2020 that would have otherwise been remitted to the federal government. The deferred tax payments will be repaid equally in 2021 and 2022.
Over the long-term, we expect that future investments, including strategic business opportunities such as acquisitions, may be financed through a number of sources, including internally available cash, availability under our revolving credit facility, new debt financing, the issuance of equity securities, or any combination of the above. All potential acquisitions are evaluated based on our acquisition strategy, which includes the enhancement of our existing products, operations, or capabilities, expanding our access to new products, markets, and customers, with the goal of creating compounding and sustainable stockholder value.
These expectations are forward-looking statements based upon currently available plans and information and may change if conditions in the credit and equity markets deteriorate or other circumstances change. To the extent that operating cash flows are lower than current or expected levels, or sources of financing are not available or not available at acceptable terms, our future liquidity may be adversely affected.
Cash Flows
The following table sets forth selected cash flow data for the three months ended March 31, (in thousands):

| 2021 |  | 2020
Cash (used in) provided by: |  |  |
Operating activities of continuing operations | $ | (1,214) |  |  | $ | (43,826) |
Investing activities of continuing operations | 22,600 |  |  | (56,631) |
Financing activities of continuing operations | (30,388) |  |  | (4,160) |
Discontinued operations | (2,187) |  |  | 136 |
Effect of foreign exchange rate changes | (134) |  |  | (916) |
Net decrease in cash and cash equivalents | $ | (11,323) |  |  | $ | (105,397) |

Operating Activities
Net cash used in operating activities of continuing operations for the three months ended March 31, 2021 of $1.2 million consisted of income from continuing operations of $10.5 million and non-cash net charges totaling $11.4 million, which include depreciation, amortization, stock compensation, exit activity costs and other non-cash charges, offset by a $23.1 million investment in working capital and other net assets. The investment in net working capital and other net assets was largely driven by an increase in inventory due to strong sales demand in our Residential segment and rising raw material prices, along with a decrease in accrued expenses correlated to payments made during the quarter under the Company's performance based incentive programs.
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Net cash used in operating activities of continuing operations for the three months ended March 31, 2020 of $43.8 million consisted of income from continuing operations of $9.9 million, non-cash net charges totaling $6.7 million, which include depreciation, amortization, stock compensation, and other non-cash charges, and an investment in working capital and other net assets of $60.4 million. The working capital investment was largely comprised of nearly $40 million related to our acquisition of Thermo, which was undercapitalized at the time of purchase in the first quarter of 2020.
Investing Activities
Net cash provided by investing activities of continuing operations for the three months ended March 31, 2021 of $22.6 million was primarily due to $27.0 million in net proceeds received from the sale of the Company's Industrial business and capital expenditures of $4.4 million.
Net cash used in investing activities of continuing operations for the three months ended March 31, 2020 of $56.6 million primarily consisted of net cash paid for the acquisitions of Delta Separations of $47.2 million and Thermo of $7.3 million and capital expenditures of $2.1 million.
Financing Activities
Net cash used in financing activities of continuing operations for the three months ended March 31, 2021 of $30.4 million was primarily the result of $46.6 million in payments on long-term debt and $4.7 million of purchases of treasury stock related to the net settlement of tax obligations for participants in the Company's equity incentive plans, offset by $20.0 million in proceeds from long-term debt and $0.9 million from the issuance of common stock from stock option exercises during the period.
Net cash used in financing activities of continuing operations for the three months ended March 31, 2020 of $4.2 million was primarily the result of purchases of treasury stock related to the net settlement of tax obligations for participants in the Company's equity incentive plans.
See Note 8 to the Company's consolidated financial statements in Part I, Item 1, Financial Statements, of this Form 10-Q for further information on the Company’s Senior Credit Agreement.
Off Balance Sheet Financing Arrangements
We have no off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures, or capital resources that is material to investors.
Contractual Obligations
Our contractual obligations have not changed materially from the disclosures included in Item 7 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020.
Critical Accounting Estimates
In the current year, there have been no changes to our critical accounting estimates from those disclosed in the consolidated financial statements and accompanying notes contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2020.
Recent Accounting Pronouncements
See Note 2 to the Company's consolidated financial statements in Part I, Item 1 of this Form 10-Q for further information on recent accounting pronouncements.
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Item 3. Qualitative and Quantitative Disclosures About Market Risk
In the ordinary course of business, the Company is exposed to various market risk factors, including changes in general economic conditions, competition, foreign exchange rates, and raw materials pricing and availability. In addition, the Company is exposed to other financial market risks, primarily related to its foreign operations. Refer to Item 7A in the Company's Form 10-K for the year ended December 31, 2020 for more information about the Company's exposure to market risk.
Item 4. Controls and Procedures
(a)Evaluation of Disclosure Controls and Procedures
The Company maintains a system of disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934). The Company’s Chief Executive Officer and the Chief Financial Officer evaluated the effectiveness of the Company’s disclosure controls as of the end of the period covered in this report. Based upon that evaluation and the definition of disclosure controls and procedures contained in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that as of the end of such period the Company’s disclosure controls and procedures were effective.
(b)Changes in Internal Control over Financial Reporting
There have been no changes in the Company’s internal control over financial reporting (as defined by Rule 13a-15(f) or 15d-15(f)) that occurred during the period covered by this Quarterly Report on Form 10-Q that have materially affected the Company’s internal control over financial reporting.
PART II. OTHER INFORMATION
Item 1. Legal Proceedings
Not applicable.
Item 1A. Risk Factors
In addition to the other information set forth in this report, you should carefully consider the risks discussed in “Part I, Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. These risks and uncertainties have the potential to materially affect our business, financial condition, results of operation, cash flows, and future prospects. Additional risks and uncertainties not currently known to us or that we currently deem immaterial may materially adversely impact our business, financial condition, or operating results. We believe there have been no material changes from the risk factors previously disclosed in our Form 10-K.
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Not applicable.
Item 3. Defaults Upon Senior Securities
Not applicable.
Item 4. Mine Safety Disclosures
Not applicable.
Item 5. Other Information
Not applicable.
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Item 6. Exhibits
(a) Exhibits

| 31.1 | Certification of President and Chief Executive Officer pursuant to Section 302 of the Sarbanes–Oxley Act of 2002.
| 31.2 | Certification of Senior Vice President and Chief Financial Officer pursuant to Section 302 of the Sarbanes–Oxley Act of 2002.
| 32.1 | Certification of the President and Chief Executive Officer pursuant to Title 18, United States Code, Section 1350, as adopted pursuant to Section 906 of the Sarbanes–Oxley Act of 2002.
| 32.2 | Certification of the Senior Vice President and Chief Financial Officer pursuant to Title 18, United States Code, Section 1350, as adopted pursuant to Section 906 of the Sarbanes–Oxley Act of 2002.
| 101.INS | XBRL Instance Document *
| 101.SCH | XBRL Taxonomy Extension Schema Document *
| 101.CAL | XBRL Taxonomy Extension Calculation Linkbase Document *
| 101.LAB | XBRL Taxonomy Extension Label Linkbase Document *
| 101.PRA | XBRL Taxonomy Extension Presentation Linkbase Document *
| 101.DEF | XBRL Taxonomy Extension Definition Linkbase Document *

* | Submitted electronically with this Quarterly Report on Form 10-Q.

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SIGNATURES
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.
GIBRALTAR INDUSTRIES, INC.
(Registrant)

/s/ William T. Bosway
William T. Bosway
President and Chief Executive Officer

/s/ Timothy F. Murphy
Timothy F. Murphy
Senior Vice President and Chief Financial Officer

Date: May 5, 2021
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