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Long-Term Debt (Maximum Secured Leverage Ratio) (Details)
Dec. 31, 2017
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