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Basis of Presentation - Covid 19 (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Apr. 23, 2020
Debt Instrument [Line Items]        
Cash and cash equivalents - unrestricted $ 53,155,000 $ 56,697,000 $ 52,162,000  
$800M Gaylord Rockies Term Loan [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Face amount 800,000,000      
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Remaining borrowing capacity $ 519,700,000      
Sixth Amended And Restated Credit Agreement [Member]        
Debt Instrument [Line Items]        
Dividends permitted amount per quarter       $ 0.01