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Debt - Narrative (Details)
3 Months Ended
Jul. 30, 2020
USD ($)
property
Mar. 31, 2021
USD ($)
extension_option
Hollywood Media Portfolio | Investee    
Debt Instrument    
Notes receivable $ 107,800,000  
Blackstone | Hollywood Media Portfolio | Investee    
Debt Instrument    
Notes receivable 12,500,000  
Joint venture partner debt    
Debt Instrument    
Debt instrument, number of extension options | extension_option   2
Secured debt | Hollywood Media Portfolio Debt    
Debt Instrument    
Face amount $ 900,000,000.0  
Debt instrument, term 2 years  
Debt instrument, number of extension options | property 3  
Extension term 1 year  
Revolving credit facility    
Debt Instrument    
Increase in borrowings, net of draws   $ 0
Revolving credit facility | Unsecured debt    
Debt Instrument    
Extension term   1 year