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Long-Term Debt (Boyd Credit Agreement - Narrative) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 14, 2013
USD ($)
Line of Credit Facility [Line Items]        
Prepayment fee, percentage 1.00%      
Fixed quarterly amortization of principal, percentage 5.00%      
Loss on early extinguishment of debt $ 42,364,000 $ 40,733,000 $ 1,536,000  
Maximum secured leverage ratio 4.50      
Amortization of debt financing costs and discounts on debt $ 14,870,000 21,308,000 $ 22,377,000  
Boyd        
Line of Credit Facility [Line Items]        
Maximum secured leverage ratio 4.25      
Minimum consolidated interest coverage ratio required 1.00      
Boyd | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 775,000,000
Revolving Credit Facility and Term Loan | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Additional available borrowing capacity $ 550,000,000      
Revolving Credit Facility [Member] | Boyd        
Line of Credit Facility [Line Items]        
Maximum secured leverage ratio 1.00      
Term Loan B-2 [Member] | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       1,000,000,000.0
Term Loan A | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 225,000,000
Amortization of debt financing costs and discounts on debt $ 0.0500      
Term Loan B | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Amortization of debt financing costs and discounts on debt $ 0.0100      
Senior Secured Notes | Boyd        
Line of Credit Facility [Line Items]        
Debt Instrument, Covenant Terms, Maximum Required Coverage Ratio 1.0      
Letter of Credit | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding $ 12,000,000      
Bank Credit Facility | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 1,782,538,000 1,209,725,000    
Remaining borrowing capacity $ 471,900,000      
Bank Credit Facility | Initial Term Loan | Boyd        
Line of Credit Facility [Line Items]        
Fixed quarterly amortization of principal, percentage 1.00%      
Amount outstanding $ 222,188,000 183,275,000    
Bank Credit Facility | Revolving Credit Facility [Member] | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 245,000,000 240,000,000    
Bank Credit Facility | Term Loan B-2 [Member] | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 997,500,000 0    
Bank Credit Facility | Term Loan B | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding $ 271,750,000 $ 730,750,000    
Eurodollar | Term Loan B | Maximum | Boyd        
Line of Credit Facility [Line Items]        
Applicable margin 3.00%      
Eurodollar | Term Loan B | Minimum | Boyd        
Line of Credit Facility [Line Items]        
Applicable margin 1.00%      
Eurodollar | Term Loan B-2 [Member] | Maximum | Boyd        
Line of Credit Facility [Line Items]        
Applicable margin 3.00%      
Eurodollar | Term Loan B-2 [Member] | Minimum | Boyd        
Line of Credit Facility [Line Items]        
Applicable margin 0.00%      
Base Rate | Term Loan B | Boyd        
Line of Credit Facility [Line Items]        
Applicable margin 2.00%      
Base Rate | Term Loan B-2 [Member]        
Line of Credit Facility [Line Items]        
Applicable margin 2.00%