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Supplemental Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 15, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by operating activities |  | $ 70,070 | $ 123,987 | $ 87,221
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant, and equipment |  | (11,399) | (10,779) | (12,373)
Acquisitions, net of cash acquired |  | (18,494) | (23,412) | (140,621)
Net proceeds from sale of property and equipment |  | 13,096 | 953 | 26,500
Net proceeds from sale of business | $ 8,300 | 0 | 8,250 | 0
Net cash used in investing activities |  | (16,797) | (23,870) | (125,340)
Other, net |  | 0 | 1,118 | 1,154
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | (400) | (400) | (73,642)
Proceeds from long-term debt |  | 0 | 0 | 73,242
Payment of debt issuance costs |  | 0 | (54) | (1,166)
Purchase of treasury stock at market prices |  | (2,872) | (1,539) | (956)
Intercompany financing |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  | 674 | 3,341 | 1,801
Net cash (used in) provided by financing activities |  | (2,598) | 1,348 | (721)
Effect of exchange rate changes on cash |  | 1,428 | (146) | (2,912)
Net increase (decrease) in cash and cash equivalents |  | 52,103 | 101,319 | (41,752)
Cash and cash equivalents at beginning of year |  | 170,177 | 68,858 | 110,610
Cash and cash equivalents at end of year |  | 222,280 | 170,177 | 68,858
Gibraltar Industries, Inc. |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by operating activities |  | (15,172) | (34,243) | (13,309)
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant, and equipment |  | 0 | 0 | 0
Acquisitions, net of cash acquired |  | 0 | 0 | 0
Net proceeds from sale of property and equipment |  | 0 | 0 | 0
Net proceeds from sale of business |  |  | 0 |
Net cash used in investing activities |  | 0 | 0 | 0
Other, net |  |  | 0 | 0
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Proceeds from long-term debt |  |  |  | 0
Payment of debt issuance costs |  |  | 0 | 0
Purchase of treasury stock at market prices |  | (2,872) | (1,539) | (956)
Intercompany financing |  | 17,370 | 32,441 | 12,464
Net proceeds from issuance of common stock |  | 674 | 3,341 | 1,801
Net cash (used in) provided by financing activities |  | 15,172 | 34,243 | 13,309
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 0 | 0 | 0
Cash and cash equivalents at beginning of year |  | 0 | 0 | 0
Cash and cash equivalents at end of year |  | 0 | 0 | 0
Guarantor Subsidiaries |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by operating activities |  | 83,114 | 140,890 | 94,977
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant, and equipment |  | (11,026) | (10,321) | (11,754)
Acquisitions, net of cash acquired |  | (18,494) | (23,412) | (114,145)
Net proceeds from sale of property and equipment |  | 12,905 | 230 | 26,500
Net proceeds from sale of business |  |  | 0 |
Net cash used in investing activities |  | (16,615) | (32,385) | (98,245)
Other, net |  |  | 1,118 | 1,154
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | (400) | (400) | (73,642)
Proceeds from long-term debt |  |  |  | 73,242
Payment of debt issuance costs |  |  | (54) | (1,166)
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | (17,321) | (3,822) | (47,035)
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash (used in) provided by financing activities |  | (17,721) | (4,276) | (48,601)
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 48,778 | 104,229 | (51,869)
Cash and cash equivalents at beginning of year |  | 143,826 | 39,597 | 91,466
Cash and cash equivalents at end of year |  | 192,604 | 143,826 | 39,597
Non-Guarantor Subsidiaries |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by operating activities |  | 2,128 | 17,340 | 5,553
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant, and equipment |  | (373) | (458) | (619)
Acquisitions, net of cash acquired |  | 0 | 0 | (26,476)
Net proceeds from sale of property and equipment |  | 191 | 723 | 0
Net proceeds from sale of business |  |  | 8,250 |
Net cash used in investing activities |  | (182) | 8,515 | (27,095)
Other, net |  |  | 0 |
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Payment of debt issuance costs |  |  | 0 | 0
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | (49) | (28,619) | 34,571
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash (used in) provided by financing activities |  | (49) | (28,619) | 34,571
Effect of exchange rate changes on cash |  | 1,428 | (146) | (2,912)
Net increase (decrease) in cash and cash equivalents |  | 3,325 | (2,910) | 10,117
Cash and cash equivalents at beginning of year |  | 26,351 | 29,261 | 19,144
Cash and cash equivalents at end of year |  | 29,676 | 26,351 | 29,261
Eliminations |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash provided by operating activities |  | 0 | 0 | 0
Cash Flows from Investing Activities |  |  |  |
Purchases of property, plant, and equipment |  | 0 | 0 | 0
Acquisitions, net of cash acquired |  | 0 | 0 | 0
Net proceeds from sale of property and equipment |  | 0 | 0 | 0
Net proceeds from sale of business |  |  | 0 |
Net cash used in investing activities |  | 0 | 0 | 0
Other, net |  |  | 0 |
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Payment of debt issuance costs |  |  | 0 | 0
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash (used in) provided by financing activities |  | 0 | 0 | 0
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 0 | 0 | 0
Cash and cash equivalents at beginning of year |  | 0 | 0 | 0
Cash and cash equivalents at end of year |  | $ 0 | $ 0 | $ 0

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