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Quarterly Unaudited Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Unaudited Financial Information | GIBRALTAR INDUSTRIES, INC. QUARTERLY UNAUDITED FINANCIAL DATA (in thousands, except per share data)
| 2017 Quarters Ended
| March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales | $ | 206,605 |  |  | $ | 247,627 |  |  | $ | 274,574 |  |  | $ | 258,112 |  |  | $ | 986,918 |
Gross profit | $ | 49,255 |  |  | $ | 61,825 |  |  | $ | 68,735 |  |  | $ | 56,729 |  |  | $ | 236,544 |
Income from operations | $ | 9,679 |  |  | $ | 24,930 |  |  | $ | 35,693 |  |  | $ | 22,547 |  |  | $ | 92,849 |
Interest expense | $ | 3,576 |  |  | $ | 3,550 |  |  | $ | 3,486 |  |  | $ | 3,420 |  |  | $ | 14,032 |
Net income from continuing operations | $ | 3,996 |  |  | $ | 13,174 |  |  | $ | 20,619 |  |  | $ | 25,176 |  |  | $ | 62,965 |
Net loss from discontinued operations | $ | — |  |  | $ | (405 | ) |  | $ | — |  |  | $ | — |  |  | $ | (405 | )
Total net income | $ | 3,996 |  |  | $ | 12,769 |  |  | $ | 20,619 |  |  | $ | 25,176 |  |  | $ | 62,560 |
Income per share from continuing operations: |  |  |  |  |  |  |  |
Basic | $ | 0.13 |  |  | $ | 0.41 |  |  | $ | 0.65 |  |  | $ | 0.79 |  |  | $ | 1.98 |
Diluted | $ | 0.12 |  |  | $ | 0.41 |  |  | $ | 0.64 |  |  | $ | 0.78 |  |  | $ | 1.95 |
Loss per share from discontinued operations: |  |  |  |  |  |  |  |
Basic | $ | — |  |  | $ | (0.01 | ) |  | $ | — |  |  | $ | — |  |  | $ | (0.01 | )
Diluted | $ | — |  |  | $ | (0.01 | ) |  | $ | — |  |  | $ | — |  |  | $ | (0.01 | )
| 2016 Quarters Ended
| March 31 |  | June 30 |  | September 30 |  | December 31 |  | Total
Net sales | $ | 237,671 |  |  | $ | 265,738 |  |  | $ | 272,734 |  |  | $ | 231,838 |  |  | $ | 1,007,981 |
Gross profit | $ | 54,150 |  |  | $ | 68,843 |  |  | $ | 67,887 |  |  | $ | 53,882 |  |  | $ | 244,762 |
Income from operations | $ | 17,761 |  |  | $ | 28,576 |  |  | $ | 26,522 |  |  | $ | 629 |  |  | $ | 73,488 |
Interest expense | $ | 3,691 |  |  | $ | 3,666 |  |  | $ | 3,625 |  |  | $ | 3,595 |  |  | $ | 14,577 |
Net income (loss) from continuing operations | $ | 9,029 |  |  | $ | 18,612 |  |  | $ | 13,786 |  |  | $ | (7,708 | ) |  | $ | 33,719 |
Net loss from discontinued operations | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (44 | ) |  | $ | (44 | )
Total net income (loss) | $ | 9,029 |  |  | $ | 18,612 |  |  | $ | 13,786 |  |  | $ | (7,752 | ) |  | $ | 33,675 |
Income (loss) per share from continuing operations: |  |  |  |  |  |  |  |
Basic | $ | 0.29 |  |  | $ | 0.59 |  |  | $ | 0.44 |  |  | $ | (0.24 | ) |  | $ | 1.07 |
Diluted | $ | 0.28 |  |  | $ | 0.58 |  |  | $ | 0.43 |  |  | $ | (0.24 | ) |  | $ | 1.05 |
Loss per share from discontinued operations: |  |  |  |  |  |  |  |
Basic | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Diluted | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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