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Commitments and Contingencies Boyd Commitments (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Commitments [Line Items]        
Purchase price   $ 1,200    
Project development, preopening and writedowns   45,698 $ 14,454 $ 22,107
Development Agreement        
Other Commitments [Line Items]        
Purchase price $ 24,500      
Project development, preopening and writedowns   8,900    
Minimum        
Other Commitments [Line Items]        
Obligation to fund certain pre-development costs, annual amount   1,000    
Maximum        
Other Commitments [Line Items]        
Obligation to fund certain pre-development costs, annual amount   $ 2,000