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Long-Term Debt (Maximum Total Leverage Ratio) (Details)
Dec. 31, 2017
USD ($)
Boyd  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Maximum Consolidated Interest Coverage Ratio Required 1.75
Minimum consolidated interest coverage ratio required 1.00
Boyd | Four Fiscal Quarters Ended March 31, 2017 through December 31, 2017  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Minimum Total Leverage Ratio Allowed 1.00
Maximum total leverage ratio 7.00
Boyd | Four Fiscal Quarters Ending March 31, 2015 through December 31, 2016  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Minimum Total Leverage Ratio Allowed 1.00
Maximum total leverage ratio 6.25
Boyd | Four Fiscal Quarters Ended March 31, 2019 through December 31, 2019 [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Minimum Total Leverage Ratio Allowed 1.00
Maximum total leverage ratio 6.00
Boyd | Four Fiscal Quarters Ended March 31, 2020 through December 31, 2020 [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Minimum Total Leverage Ratio Allowed 1.00
Maximum total leverage ratio 5.75
Boyd | Four Fiscal Quarters Ended March 31, 2018 and Thereafter [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Covenant Terms, Minimum Total Leverage Ratio Allowed 1.00
Maximum total leverage ratio 5.5
Refinancing Term B Loans [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 1,264.5