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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle      
Short-term investments $ 0   $ 19,973
Customer Concentration Risk | Sales Revenue, Net | Caesars Entertainment Corporation      
New Accounting Pronouncements or Change in Accounting Principle      
Concentration risk, percentage 86.00% 82.00%  
Property, Las Vegas Strip | Geographic Concentration Risk | Sales Revenue, Net      
New Accounting Pronouncements or Change in Accounting Principle      
Concentration risk, percentage 32.00% 29.00%  
Harrah’s Joliet LandCo LLC      
New Accounting Pronouncements or Change in Accounting Principle      
Ownership percentage by noncontrolling owners 20.00%