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Supplemental Financial Information (Consolidating Statements of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 231,838 | $ 272,734 | $ 265,738 | $ 237,671 | $ 282,093 | $ 304,994 | $ 253,171 | $ 200,615 | $ 1,007,981 | $ 1,040,873 | $ 862,087
Cost of sales |  |  |  |  |  |  |  |  | 763,219 | 853,897 | 722,042
Gross profit | 53,882 | 67,887 | 68,843 | 54,150 | 51,546 | 61,396 | 44,119 | 29,915 | 244,762 | 186,976 | 140,045
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 161,623 | 134,028 | 102,492
Intangible asset impairment |  |  |  |  |  |  |  |  | 10,175 | 4,863 | 107,970
Income (loss) from operations | 584 | 26,363 | 28,416 | 17,601 | 4,520 | 23,394 | 11,201 | 8,970 | 72,964 | 48,085 | (70,417)
Interest expense | 3,595 | 3,625 | 3,666 | 3,691 | 3,614 | 3,878 | 3,811 | 3,700 | 14,577 | 15,003 | 14,421
Other expense (income) |  |  |  |  |  |  |  |  | 8,404 | (4,018) | (88)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 49,983 | 37,100 | (84,750)
Provision for (benefit of) income taxes |  |  |  |  |  |  |  |  | 16,264 | 13,624 | (2,958)
Income (loss) from continuing operations | (7,708) | 13,786 | 18,612 | 9,029 | 220 | 13,632 | 4,087 | 5,537 | 33,719 | 23,476 | (81,792)
Loss before taxes |  |  |  |  |  |  |  |  | (70) | (44) | (51)
Benefit of income taxes |  |  |  |  |  |  |  |  | (26) | (16) | (19)
Loss from discontinued operations | (44) | 0 | 0 | 0 | 0 | 0 | 0 | (28) | (44) | (28) | (32)
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) | $ (7,752) | $ 13,786 | $ 18,612 | $ 9,029 | $ 220 | $ 13,632 | $ 4,087 | $ 5,509 | 33,675 | 23,448 | (81,824)
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 |  |  |  |  |  |  |  |  | 14,302 | 133 | 128
Intangible asset impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from operations |  |  |  |  |  |  |  |  | (14,302) | (133) | (128)
Interest expense |  |  |  |  |  |  |  |  | 13,609 | 13,609 | 13,568
Other expense (income) |  |  |  |  |  |  |  |  | 8,716 | 50 | 144
Income (loss) before taxes |  |  |  |  |  |  |  |  | (36,627) | (13,792) | (13,840)
Provision for (benefit of) income taxes |  |  |  |  |  |  |  |  | (11,768) | (4,427) | (4,381)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (24,859) | (9,365) | (9,459)
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 |  |  |  |  |  |  |  |  | 57,857 | 36,401 | (71,191)
Net income (loss) |  |  |  |  |  |  |  |  | 32,998 | 27,036 | (80,650)
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 950,945 | 960,614 | 792,078
Cost of sales |  |  |  |  |  |  |  |  | 722,315 | 785,085 | 661,041
Gross profit |  |  |  |  |  |  |  |  | 228,630 | 175,529 | 131,037
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 137,867 | 116,529 | 95,735
Intangible asset impairment |  |  |  |  |  |  |  |  | 7,980 | 4,863 | 107,970
Income (loss) from operations |  |  |  |  |  |  |  |  | 82,783 | 54,137 | (72,668)
Interest expense |  |  |  |  |  |  |  |  | 1,042 | 1,469 | 995
Other expense (income) |  |  |  |  |  |  |  |  | (12) | (3,801) | (328)
Income (loss) before taxes |  |  |  |  |  |  |  |  | 81,753 | 56,469 | (73,335)
Provision for (benefit of) income taxes |  |  |  |  |  |  |  |  | 27,551 | 18,827 | 753
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 54,202 | 37,642 | (74,088)
Loss before taxes |  |  |  |  |  |  |  |  | (70) | (44) | (51)
Benefit of income taxes |  |  |  |  |  |  |  |  | (26) | (16) | (19)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (44) | (28) | (32)
Equity in earnings from subsidiaries |  |  |  |  |  |  |  |  | 3,699 | (1,213) | 2,929
Net income (loss) |  |  |  |  |  |  |  |  | 57,857 | 36,401 | (71,191)
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 78,184 | 109,984 | 88,096
Cost of sales |  |  |  |  |  |  |  |  | 62,729 | 94,949 | 77,914
Gross profit |  |  |  |  |  |  |  |  | 15,455 | 15,035 | 10,182
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 9,454 | 17,366 | 6,629
Intangible asset impairment |  |  |  |  |  |  |  |  | 2,195 | 0 | 0
Income (loss) from operations |  |  |  |  |  |  |  |  | 3,806 | (2,331) | 3,553
Interest expense |  |  |  |  |  |  |  |  | (74) | (75) | (142)
Other expense (income) |  |  |  |  |  |  |  |  | (300) | (267) | 96
Income (loss) before taxes |  |  |  |  |  |  |  |  | 4,180 | (1,989) | 3,599
Provision for (benefit of) income taxes |  |  |  |  |  |  |  |  | 481 | (776) | 670
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 3,699 | (1,213) | 2,929
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 (loss) |  |  |  |  |  |  |  |  | 3,699 | (1,213) | 2,929
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (21,148) | (29,725) | (18,087)
Cost of sales |  |  |  |  |  |  |  |  | (21,825) | (26,137) | (16,913)
Gross profit |  |  |  |  |  |  |  |  | 677 | (3,588) | (1,174)
Selling, general, and administrative expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intangible asset impairment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from operations |  |  |  |  |  |  |  |  | 677 | (3,588) | (1,174)
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before taxes |  |  |  |  |  |  |  |  | 677 | (3,588) | (1,174)
Provision for (benefit of) income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 677 | (3,588) | (1,174)
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 |  |  |  |  |  |  |  |  | (61,556) | (35,188) | 68,262
Net income (loss) |  |  |  |  |  |  |  |  | $ (60,879) | $ (38,776) | $ 67,088

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