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Long-Term Debt (Boyd Bank Credit Facility Narrative) (Details) - Parent - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 775,000  
Revolving Credit Facility, Joinder Agreement [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Additional Available Borrowing Capacity 170,500  
Line of Credit Facility, Maximum Borrowing Capacity 945,500  
Line of Credit    
Line of Credit Facility [Line Items]    
Amount outstanding 1,363,477 $ 1,621,054
Line of Credit Facility, Remaining Borrowing Capacity 762,300  
Line of Credit | Term Loan A, Joinder Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding 248,400  
Long-term Line of Credit, Additional Available Borrowing Capacity 49,500  
Line of Credit | Term Loan A [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding 204,475 210,938
Line of Credit | Refinancing Term B Loans [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding 1,159,002 $ 1,170,016
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding $ 12,700