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Supplemental Financial Information (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 258,112 | $ 274,574 | $ 247,627 | $ 206,605 | $ 231,838 | $ 272,734 | $ 265,738 | $ 237,671 | $ 986,918 | $ 1,007,981 | $ 1,040,873
Cost of sales |  |  |  |  |  |  |  |  | 750,374 | 763,219 | 853,897
Gross profit | 56,729 | 68,735 | 61,825 | 49,255 | 53,882 | 67,887 | 68,843 | 54,150 | 236,544 | 244,762 | 186,976
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 143,448 | 161,099 | 133,381
Intangible asset impairment |  |  |  |  |  |  |  |  | 247 | 10,175 | 4,863
Income from operations | 22,547 | 35,693 | 24,930 | 9,679 | 629 | 26,522 | 28,576 | 17,761 | 92,849 | 73,488 | 48,732
Interest expense | 3,420 | 3,486 | 3,550 | 3,576 | 3,595 | 3,625 | 3,666 | 3,691 | 14,032 | 14,577 | 15,003
Other expense (income) |  |  |  |  |  |  |  |  | 909 | 8,928 | (3,371)
Income before taxes |  |  |  |  |  |  |  |  | 77,908 | 49,983 | 37,100
Provision for income taxes |  |  |  |  |  |  |  |  | 14,943 | 16,264 | 13,624
Income from continuing operations | 25,176 | 20,619 | 13,174 | 3,996 | (7,708) | 13,786 | 18,612 | 9,029 | 62,965 | 33,719 | 23,476
Loss before taxes |  |  |  |  |  |  |  |  | (644) | (70) | (44)
Benefit of income taxes |  |  |  |  |  |  |  |  | (239) | (26) | (16)
Loss from discontinued operations | 0 | 0 | (405) | 0 | (44) | 0 | 0 | 0 | (405) | (44) | (28)
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | $ 25,176 | $ 20,619 | $ 12,769 | $ 3,996 | $ (7,752) | $ 13,786 | $ 18,612 | $ 9,029 | 62,560 | 33,675 | 23,448
Gibraltar Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross profit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 147 | 14,302 | 133
Intangible asset impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations |  |  |  |  |  |  |  |  | (147) | (14,302) | (133)
Interest expense |  |  |  |  |  |  |  |  | 13,609 | 13,609 | 13,609
Other expense (income) |  |  |  |  |  |  |  |  | 0 | 8,716 | 50
Income before taxes |  |  |  |  |  |  |  |  | (13,756) | (36,627) | (13,792)
Provision for income taxes |  |  |  |  |  |  |  |  | (5,079) | (11,768) | (4,427)
Income from continuing operations |  |  |  |  |  |  |  |  | (8,677) | (24,859) | (9,365)
Loss before taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit of income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 72,261 | 57,857 | 36,401
Net income |  |  |  |  |  |  |  |  | 63,584 | 32,998 | 27,036
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 947,604 | 950,945 | 960,614
Cost of sales |  |  |  |  |  |  |  |  | 719,587 | 722,315 | 785,085
Gross profit |  |  |  |  |  |  |  |  | 228,017 | 228,630 | 175,529
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 133,409 | 137,343 | 115,882
Intangible asset impairment |  |  |  |  |  |  |  |  | 200 | 7,980 | 4,863
Income from operations |  |  |  |  |  |  |  |  | 94,408 | 83,307 | 54,784
Interest expense |  |  |  |  |  |  |  |  | 512 | 1,042 | 1,469
Other expense (income) |  |  |  |  |  |  |  |  | 500 | 512 | (3,154)
Income before taxes |  |  |  |  |  |  |  |  | 93,396 | 81,753 | 56,469
Provision for income taxes |  |  |  |  |  |  |  |  | 19,787 | 27,551 | 18,827
Income from continuing operations |  |  |  |  |  |  |  |  | 73,609 | 54,202 | 37,642
Loss before taxes |  |  |  |  |  |  |  |  | (644) | (70) | (44)
Benefit of income taxes |  |  |  |  |  |  |  |  | (239) | (26) | (16)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (405) | (44) | (28)
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | (943) | 3,699 | (1,213)
Net income |  |  |  |  |  |  |  |  | 72,261 | 57,857 | 36,401
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 52,738 | 78,184 | 109,984
Cost of sales |  |  |  |  |  |  |  |  | 43,187 | 62,729 | 94,949
Gross profit |  |  |  |  |  |  |  |  | 9,551 | 15,455 | 15,035
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 9,892 | 9,454 | 17,366
Intangible asset impairment |  |  |  |  |  |  |  |  | 47 | 2,195 | 0
Income from operations |  |  |  |  |  |  |  |  | (388) | 3,806 | (2,331)
Interest expense |  |  |  |  |  |  |  |  | (89) | (74) | (75)
Other expense (income) |  |  |  |  |  |  |  |  | 409 | (300) | (267)
Income before taxes |  |  |  |  |  |  |  |  | (708) | 4,180 | (1,989)
Provision for income taxes |  |  |  |  |  |  |  |  | 235 | 481 | (776)
Income from continuing operations |  |  |  |  |  |  |  |  | (943) | 3,699 | (1,213)
Loss before taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit of income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | (943) | 3,699 | (1,213)
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (13,424) | (21,148) | (29,725)
Cost of sales |  |  |  |  |  |  |  |  | (12,400) | (21,825) | (26,137)
Gross profit |  |  |  |  |  |  |  |  | (1,024) | 677 | (3,588)
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intangible asset impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations |  |  |  |  |  |  |  |  | (1,024) | 677 | (3,588)
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before taxes |  |  |  |  |  |  |  |  | (1,024) | 677 | (3,588)
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from continuing operations |  |  |  |  |  |  |  |  | (1,024) | 677 | (3,588)
Loss before taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Benefit of income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | (71,318) | (61,556) | (35,188)
Net income |  |  |  |  |  |  |  |  | $ (72,342) | $ (60,879) | $ (38,776)

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