Organization and Basis of Presentation	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	ORGANIZATION AND BASIS OF PRESENTATION Organization Boyd Gaming Corporation (and together with its subsidiaries, the "Company," "Boyd Gaming," "we" or "us") was incorporated in the state of Nevada in 1988 and has been operating since 1975. The Company's common stock is traded on the New York Stock Exchange under the symbol "BYD." We are a diversified operator of 22 wholly owned gaming entertainment properties. Headquartered in Las Vegas, we have gaming operations in Nevada, Illinois, Indiana, Iowa, Kansas, Louisiana and Mississippi. Basis of Presentation The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all information and footnote disclosures necessary for complete financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP"). These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the U.S. Securities and Exchange Commission ("SEC") on February 25, 2016. The results for the periods indicated are unaudited, but reflect all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of financial position, results of operations and cash flows. Results of operations and cash flows for the interim periods presented herein are not necessarily indicative of the results that would be achieved during a full year of operations or in future periods. On September 27, 2016, we completed our previously announced acquisition of ALST Casino Holdco, LLC ("ALST"), pursuant to an Agreement and Plan of Merger (the "Merger Agreement"), dated as of April 21, 2016, as amended on September 26, 2016, by and among Boyd Gaming, Boyd TCII Acquisition, LLC, a wholly-owned subsidiary of Boyd Gaming ("Merger Sub"), and ALST. The net purchase price, after adjustment for working capital and other items, was $372.3 million. The acquired assets and liabilities of ALST are included in our condensed consolidated balance sheet as of September 30, 2016, and the results of its operations and cash flows are reported in our condensed consolidated statements of operations and cash flows from September 27, 2016 through September 30, 2016. See Note 3, Acquisitions and Divestitures, for further information. We have not disclosed the pro forma impact of this acquisition to the results of operations for the three and nine months ended September 30, 2016, as the pro forma impact was deemed immaterial. The accompanying condensed consolidated financial statements include the accounts of Boyd Gaming and its wholly owned subsidiaries. Investments in unconsolidated affiliates, which do not meet the consolidation criteria of the authoritative accounting guidance for voting interest, controlling interest or variable interest entities, are accounted for under the equity method. All significant intercompany accounts and transactions have been eliminated in consolidation. On May 31, 2016, we announced that we had entered into an Equity Purchase Agreement (the "Purchase Agreement") to sell our 50% equity interest in Marina District Development Holding Company, LLC ("MDDHC"), the parent company of Borgata Hotel Casino & Spa ("Borgata"), to MGM Resorts International ("MGM"), and the transaction closed on August 1, 2016. (See Note 3, Acquisitions and Divestitures.) We account for our investment in Borgata applying the equity method and report its results as discontinued operations for all periods presented in these condensed consolidated financial statements. Revisions and Reclassifications The financial information for the three and nine months ended September 30, 2015 is derived from our condensed consolidated financial statements and footnotes included in the Quarterly Report on Form 10-Q for the quarter ended September 30, 2015 and has been revised to reflect the results of operations and cash flows of our equity investment in Borgata as discontinued operations. (See Note 3, Acquisitions and Divestitures.) Asset transaction costs that were previously disaggregated in our condensed consolidated statement of operations for the three and nine months ended September 30, 2015 were accumulated with preopening expenses. This reclassification had no effect on our retained earnings or net income as previously reported. Amortization of debt financing costs and amortization of discounts on debt, which were previously disaggregated in our condensed consolidated statement of cash flows for the nine months ended September 30, 2015, were combined. This reclassification had no effect on our cash provided by operating activities as previously reported.

ORGANIZATION AND BASIS OF PRESENTATION

Organization

Boyd Gaming Corporation (and together with its subsidiaries, the "Company," "Boyd Gaming," "we" or "us") was incorporated in the state of Nevada in 1988 and has been operating since 1975. The Company's common stock is traded on the New York Stock Exchange under the symbol "BYD."

We are a diversified operator of 22 wholly owned gaming entertainment properties. Headquartered in Las Vegas, we have gaming operations in Nevada, Illinois, Indiana, Iowa, Kansas, Louisiana and Mississippi.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared in accordance with the instructions to the Quarterly Report on Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all information and footnote disclosures necessary for complete financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP"). These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the U.S. Securities and Exchange Commission ("SEC") on February 25, 2016.

The results for the periods indicated are unaudited, but reflect all adjustments (consisting only of normal recurring adjustments) that management considers necessary for a fair presentation of financial position, results of operations and cash flows. Results of operations and cash flows for the interim periods presented herein are not necessarily indicative of the results that would be achieved during a full year of operations or in future periods.

On September 27, 2016, we completed our previously announced acquisition of ALST Casino Holdco, LLC ("ALST"), pursuant to an Agreement and Plan of Merger (the "Merger Agreement"), dated as of April 21, 2016, as amended on September 26, 2016, by and among Boyd Gaming, Boyd TCII Acquisition, LLC, a wholly-owned subsidiary of Boyd Gaming ("Merger Sub"), and ALST. The net purchase price, after adjustment for working capital and other items, was $372.3 million. The acquired assets and liabilities of ALST are included in our condensed consolidated balance sheet as of September 30, 2016, and the results of its operations and cash flows are reported in our condensed consolidated statements of operations and cash flows from September 27, 2016 through September 30, 2016. See Note 3, Acquisitions and Divestitures, for further information. We have not disclosed the pro forma impact of this acquisition to the results of operations for the three and nine months ended September 30, 2016, as the pro forma impact was deemed immaterial.

The accompanying condensed consolidated financial statements include the accounts of Boyd Gaming and its wholly owned subsidiaries. Investments in unconsolidated affiliates, which do not meet the consolidation criteria of the authoritative accounting guidance for voting interest, controlling interest or variable interest entities, are accounted for under the equity method. All significant intercompany accounts and transactions have been eliminated in consolidation. On May 31, 2016, we announced that we had entered into an Equity Purchase Agreement (the "Purchase Agreement") to sell our 50% equity interest in Marina District Development Holding Company, LLC ("MDDHC"), the parent company of Borgata Hotel Casino & Spa ("Borgata"), to MGM Resorts International ("MGM"), and the transaction closed on August 1, 2016. (See Note 3, Acquisitions and Divestitures.) We account for our investment in Borgata applying the equity method and report its results as discontinued operations for all periods presented in these condensed consolidated financial statements.

Revisions and Reclassifications

The financial information for the three and nine months ended September 30, 2015 is derived from our condensed consolidated financial statements and footnotes included in the Quarterly Report on Form 10-Q for the quarter ended September 30, 2015 and has been revised to reflect the results of operations and cash flows of our equity investment in Borgata as discontinued operations. (See Note 3, Acquisitions and Divestitures.)

Asset transaction costs that were previously disaggregated in our condensed consolidated statement of operations for the three and nine months ended September 30, 2015 were accumulated with preopening expenses. This reclassification had no effect on our retained earnings or net income as previously reported.

Amortization of debt financing costs and amortization of discounts on debt, which were previously disaggregated in our condensed consolidated statement of cash flows for the nine months ended September 30, 2015, were combined. This reclassification had no effect on our cash provided by operating activities as previously reported.