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Long-Term Debt (Maximum Total Leverage Ratio) (Details) - Boyd
$ in Millions
Dec. 31, 2018
USD ($)
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
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
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
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
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
Amended Credit Facility | Revolving Credit Facility and Term Loan  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Additional Available Borrowing Capacity $ 550.0