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Long-Term Debt (Schedule of Boyd Bank Credit Facility) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]          
Borrowings under Boyd Gaming bank credit facility     $ 396,100 $ 365,700  
Loss on early extinguishments of debt $ 30,962 $ 904 31,470 1,058  
Parent          
Line of Credit Facility [Line Items]          
Loss on early extinguishments of debt 30,008 $ 0 30,008 $ 0  
Bank Credit Facility | Swing Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 9,200   9,200   $ 6,400
Bank Credit Facility | Parent          
Line of Credit Facility [Line Items]          
Amount outstanding 1,104,000   1,104,000   1,387,425
Bank Credit Facility | Parent | Initial Term Loan          
Line of Credit Facility [Line Items]          
Amount outstanding 206,500   206,500   221,375
Bank Credit Facility | Parent | Incremental Term Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 813,000   813,000   840,750
Bank Credit Facility | Parent | Swing Loan [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding 24,500   24,500   25,300
Bank Credit Facility | Subsidiary, Peninsula Gaming [Member]          
Line of Credit Facility [Line Items]          
Amount outstanding $ 690,013   $ 690,013   $ 742,400