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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Deferred Costs [Line Items]          
Amortization expense related to deferred leasing costs $ 10,400 $ 5,400 $ 22,100 $ 17,700  
Amortization expense related to acquired lease intangibles     8,300 5,900  
Rental revenue related to amortization of below-market leases, net of above-market leases 4,200 $ 700 5,615 $ 2,953  
Goodwill 491,479   491,479   $ 491,479
Observatory          
Deferred Costs [Line Items]          
Fair value in excess of carrying value (less than) (as a percent)   15.00%   15.00%  
Observatory          
Deferred Costs [Line Items]          
Goodwill 227,500   227,500    
Real estate          
Deferred Costs [Line Items]          
Goodwill 264,000   264,000    
Lease agreements          
Deferred Costs [Line Items]          
Amortization expense related to acquired lease intangibles 5,000 $ 1,500      
Unsecured revolving credit facility | Revolving credit facility          
Deferred Costs [Line Items]          
Net deferred financing costs $ 7,800   $ 7,800   $ 2,100