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Long-Term Debt (Schedule of Boyd Bank Credit Facility) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]          
Borrowings under Boyd Gaming bank credit facility     $ 627,000 $ 605,000  
Loss on early extinguishments of debt $ 863 $ 71 32,333 1,129  
Parent          
Line of Credit Facility [Line Items]          
Loss on early extinguishments of debt 444 $ 0 30,452 $ 0  
Bank Credit Facility | Swing Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 7,200   7,200   $ 6,400
Bank Credit Facility | Parent          
Line of Credit Facility [Line Items]          
Amount outstanding 1,064,725   1,064,725   1,387,425
Bank Credit Facility | Parent | Initial Term Loan          
Line of Credit Facility [Line Items]          
Amount outstanding 195,275   195,275   221,375
Bank Credit Facility | Parent | Incremental Term Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 778,750   778,750   840,750
Bank Credit Facility | Parent | Swing Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 20,700   20,700   25,300
Bank Credit Facility | Subsidiary, Peninsula Gaming [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding $ 668,950   $ 668,950   $ 742,400