Consolidated Financial Statements	6 Months Ended
Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated Financial Statements	CONSOLIDATED FINANCIAL STATEMENTS The accompanying consolidated financial statements have been prepared by Gibraltar Industries, Inc. (the Company) without audit. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) necessary to present fairly the results of operations and other comprehensive income for the three and six months ended June 30, 2015 and 2014, the financial position at June 30, 2015 and December 31, 2014, the statements of cash flow for the six months ended June 30, 2015 and 2014, and the statement of shareholders’ equity for the six months ended June 30, 2015 have been included therein in accordance with U.S. Securities and Exchange Commission (SEC) rules and regulations and prepared using the same accounting principles as are used for our annual audited financial statements. Certain information and footnote disclosures, including significant accounting policies normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted in accordance with the prescribed SEC rules. It is suggested that these consolidated financial statements be read in conjunction with the consolidated financial statements and footnotes included in the Company’s Annual Report for the year ended December 31, 2014 as filed on Form 10-K along with any new disclosures provided below. The consolidated balance sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The results of operations for the three and six month periods ended June 30, 2015 are not necessarily indicative of the results to be expected for the full year. The Company is subject to seasonal fluctuations in its businesses primarily due to reduced activity in the first and fourth quarters for the end markets which we serve due to inclement weather. Revenue Recognition In addition to the revenue recognition policies disclosed in our 2014 annual report, the Company has begun to record revenues from contracts using percentage of completion accounting as calculated by the cost-to-cost measurement method as a result of the Company's acquisition of RBI Solar, Inc., Rough Brothers Manufacturing, Inc., and affiliates (collectively "RBI") on June 9, 2015. This method of revenue recognition only pertains to the activities of RBI. Revenue from contracts using the percentage of completion method of accounting is recognized as work progresses toward completion as determined by the ratio of cumulative costs incurred to date to estimated total contract costs at completion, multiplied by the total contract revenue, less cumulative revenue recognized in prior periods. Changes in estimates affecting sales, costs and profits are recognized in the period in which the change becomes known using the cumulative catch-up method of accounting, resulting in the cumulative effect of changes reflected in the period. Estimates are reviewed and updated quarterly for substantially all contracts. A significant change in an estimate on one or more contracts could have a material effect on our results of operations. Contract costs include all direct costs related to contract performance. Selling and administrative expenses are charged to operations as incurred. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Because of inherent uncertainties in estimating costs, it is reasonably possible that changes in performance could result in revisions to cost and income, which are recognized in the period when the revisions are determined. For the three and six months ended June 30, 2015, 6.7% and 3.8%, respectively, of revenue was recognized under the percentage of completion method. In conjunction with the percentage of completion method of accounting, the differences between costs and customer billings on uncompleted contracts are included on the balance sheet. Costs in excess of billings of $14,041,000 are included in accounts receivable, and billings in excess of costs of $21,133,000 are included in accrued expenses at June 30, 2015. Sale-Leaseback Transaction During the first quarter of 2015, in order to capitalize on favorable real estate market conditions, the Company entered into a transaction to sell one of its real estate properties to an independent third party for $26,373,000. The Company leased back the entire property under a five year operating lease agreement. In accordance with U.S. generally accepted accounting principles, the Company accounted for the transaction as a sale-leaseback. The net present value of the Company's future minimum lease payments of $5,765,000 were less than the gain on sale of $13,144,000. As such, the portion of the gain equal to the fair value of the future minimum lease payments was deferred and is being amortized on a straight-line basis over the five year life of the lease. The gain exceeding the fair value of the minimum lease payments of $7,379,000 was recognized during the quarter ended March 31, 2015 as a component of selling, general, and administrative expenses. The minimum lease payment for each of the five years is $1,378,000.

CONSOLIDATED FINANCIAL STATEMENTS

The accompanying consolidated financial statements have been prepared by Gibraltar Industries, Inc. (the Company) without audit. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) necessary to present fairly the results of operations and other comprehensive income for the three and six months ended June 30, 2015 and 2014, the financial position at June 30, 2015 and December 31, 2014, the statements of cash flow for the six months ended June 30, 2015 and 2014, and the statement of shareholders’ equity for the six months ended June 30, 2015 have been included therein in accordance with U.S. Securities and Exchange Commission (SEC) rules and regulations and prepared using the same accounting principles as are used for our annual audited financial statements.

Certain information and footnote disclosures, including significant accounting policies normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted in accordance with the prescribed SEC rules. It is suggested that these consolidated financial statements be read in conjunction with the consolidated financial statements and footnotes included in the Company’s Annual Report for the year ended December 31, 2014 as filed on Form 10-K along with any new disclosures provided below.

The consolidated balance sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

The results of operations for the three and six month periods ended June 30, 2015 are not necessarily indicative of the results to be expected for the full year. The Company is subject to seasonal fluctuations in its businesses primarily due to reduced activity in the first and fourth quarters for the end markets which we serve due to inclement weather.

Revenue Recognition

In addition to the revenue recognition policies disclosed in our 2014 annual report, the Company has begun to record revenues from contracts using percentage of completion accounting as calculated by the cost-to-cost measurement method as a result of the Company's acquisition of RBI Solar, Inc., Rough Brothers Manufacturing, Inc., and affiliates (collectively "RBI") on June 9, 2015. This method of revenue recognition only pertains to the activities of RBI.

Revenue from contracts using the percentage of completion method of accounting is recognized as work progresses toward completion as determined by the ratio of cumulative costs incurred to date to estimated total contract costs at completion, multiplied by the total contract revenue, less cumulative revenue recognized in prior periods. Changes in estimates affecting sales, costs and profits are recognized in the period in which the change becomes known using the cumulative catch-up method of accounting, resulting in the cumulative effect of changes reflected in the period. Estimates are reviewed and updated quarterly for substantially all contracts. A significant change in an estimate on one or more contracts could have a material effect on our results of operations.

Contract costs include all direct costs related to contract performance. Selling and administrative expenses are charged to operations as incurred. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. Because of inherent uncertainties in estimating costs, it is reasonably possible that changes in performance could result in revisions to cost and income, which are recognized in the period when the revisions are determined.

For the three and six months ended June 30, 2015, 6.7% and 3.8%, respectively, of revenue was recognized under the percentage of completion method.

In conjunction with the percentage of completion method of accounting, the differences between costs and customer billings on uncompleted contracts are included on the balance sheet. Costs in excess of billings of $14,041,000 are included in accounts receivable, and billings in excess of costs of $21,133,000 are included in accrued expenses at June 30, 2015.

Sale-Leaseback Transaction

During the first quarter of 2015, in order to capitalize on favorable real estate market conditions, the Company entered into a transaction to sell one of its real estate properties to an independent third party for $26,373,000. The Company leased back the entire property under a five year operating lease agreement. In accordance with U.S. generally accepted accounting principles, the Company accounted for the transaction as a sale-leaseback. The net present value of the Company's future minimum lease payments of $5,765,000 were less than the gain on sale of $13,144,000. As such, the portion of the gain equal to the fair value of the future minimum lease payments was deferred and is being amortized on a straight-line basis over the five year life of the lease. The gain exceeding the fair value of the minimum lease payments of $7,379,000 was recognized during the quarter ended March 31, 2015 as a component of selling, general, and administrative expenses. The minimum lease payment for each of the five years is $1,378,000.