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Long-Term Debt (Boyd Credit Agreement - Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 14, 2013
Line of Credit Facility [Line Items]        
Loss on early extinguishment of debt $ 40,733,000 $ 1,536,000 $ 28,346,000  
Amortization of debt financing costs and discounts on debt $ 21,308,000 22,377,000 $ 34,126,000  
Boyd        
Line of Credit Facility [Line Items]        
Loss on early extinguishment of debt   20,800,000    
Maximum secured leverage ratio 4.25      
Line of Credit Facility, Covenant Terms, Minimum Secured Leverage Ratio Allowed 1.00      
Debt Instrument, Annual Principal Payment $ 21,500,000 21,500,000    
Debt Instrument, Optional Annual Principal Payment $ 126,600,000 61,000,000    
Line of Credit Facility, Covenant Terms, Minimum Consolidated Interest Coverage Ratio Required 1.00      
Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 600,000,000
Revolving Credit Facility and Term Loan | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Additional available borrowing capacity $ 400,000,000      
Revolving Credit Facility | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Additional available borrowing capacity 150,000,000      
Swing Loan | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       100,000,000
Term Loan A | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       250,000,000
Amortization of debt financing costs and discounts on debt 0.0500      
Term Loan B | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 900,000,000
Amortization of debt financing costs and discounts on debt 0.0100      
Letter of Credit | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 7,100,000      
Bank Credit Facility | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 1,209,725,000 1,387,425,000    
Remaining borrowing capacity $ 297,200,000      
Bank Credit Facility | Incremental Term Loan | Boyd        
Line of Credit Facility [Line Items]        
Fixed quarterly amortization of principal, percentage 0.25%      
Amount outstanding $ 730,750,000 840,750,000    
Bank Credit Facility | Initial Term Loan | Boyd        
Line of Credit Facility [Line Items]        
Fixed quarterly amortization of principal, percentage 1.25%      
Amount outstanding $ 183,275,000 221,375,000    
Bank Credit Facility | Revolving Credit Facility | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 240,000,000 300,000,000    
Bank Credit Facility | Swing Loan | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding $ 55,700,000 $ 25,300,000