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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Deferred Costs [Line Items]        
Amortization expense related to deferred leasing costs $ 5,600 $ 5,900    
Rental revenue related to amortization of below-market leases, net of above-market leases 654 908    
Goodwill 491,479   $ 491,479  
Observatory        
Deferred Costs [Line Items]        
Fair value in excess of carrying value (less than) (as a percent)       10.00%
Observatory        
Deferred Costs [Line Items]        
Goodwill 227,500      
Real estate        
Deferred Costs [Line Items]        
Goodwill 264,000      
Lease agreements        
Deferred Costs [Line Items]        
Amortization expense related to acquired lease intangibles 1,700 $ 2,000    
Unsecured revolving credit facility | Revolving credit facility        
Deferred Costs [Line Items]        
Net deferred financing costs $ 8,900   $ 2,100