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Long-Term Debt (Boyd Credit Agreement - Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
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 $ 1,582 $ 42,364 $ 40,733  
Maximum secured leverage ratio 4.50      
Amortization of debt financing costs and discounts on debt $ 9,845 14,870 $ 21,308  
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
Revolving Credit Facility and Term Loan | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Additional available borrowing capacity $ 550,000      
Revolving Credit Facility [Member] | Boyd        
Line of Credit Facility [Line Items]        
Maximum secured leverage ratio 1.00      
Term Loan A | Boyd | Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 225,000
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 $ 12,900      
Bank Credit Facility | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 1,621,054 1,782,538    
Remaining borrowing capacity 522,000      
Bank Credit Facility | Initial Term Loan | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 210,938 222,188    
Bank Credit Facility | Revolving Credit Facility [Member] | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 170,000 245,000    
Bank Credit Facility | Term Loan B-2 [Member] | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding 0 997,500    
Bank Credit Facility | Term Loan B | Boyd        
Line of Credit Facility [Line Items]        
Amount outstanding $ 0 $ 271,750