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Long-Term Debt (Maximum Secured Leverage Ratio) (Details) | Dec. 31, 2017
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Line of Credit Facility [Line Items] |
Maximum secured leverage ratio | 4.50
Line of Credit Facility, Covenant Terms, Minimum Secured Leverage Ratio Allowed | 1.00
Boyd |
Line of Credit Facility [Line Items] |
Maximum secured leverage ratio | 4.25
Boyd | Four Fiscal Quarters Ending March 31, 2015 through December 31, 2016 |
Line of Credit Facility [Line Items] |
Maximum secured leverage ratio | 4.00
Line of Credit Facility, Covenant Terms, Minimum Secured Leverage Ratio Allowed | 1.00
Boyd | Four Fiscal Quarters Ended March 31, 2019 through December 31, 2019 [Member] |
Line of Credit Facility [Line Items] |
Maximum secured leverage ratio | 3.75
Line of Credit Facility, Covenant Terms, Minimum Secured Leverage Ratio Allowed | 1.00
Boyd | Four Fiscal Quarters Ended March 31, 2018 and Thereafter |
Line of Credit Facility [Line Items] |
Maximum secured leverage ratio | 3.50
Line of Credit Facility, Covenant Terms, Minimum Secured Leverage Ratio Allowed | 1.00

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