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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Deferred Costs [Line Items]      
Amortization of deferred leasing costs $ 6,200 $ 5,800  
Revenue related to amortization of acquired above- and below-market leases, net 1,428 4,231  
Goodwill 491,479   $ 491,479
Lease Agreements      
Deferred Costs [Line Items]      
Amortization expense related to acquired lease intangibles 4,400 $ 7,700  
Observatory      
Deferred Costs [Line Items]      
Goodwill 227,500    
Real Estate      
Deferred Costs [Line Items]      
Goodwill 264,000    
Revolving Credit Facility | Unsecured Revolving Credit Facility      
Deferred Costs [Line Items]      
Net deferred financing costs $ 4,000