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Acquisitions (Details)
$ in Thousands
May 20, 2016
USD ($)
ft²
Extensions
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Mortgages payable   $ 9,867,550 $ 9,513,713
Houston Street | Office and retail building | Joint Venture      
Business Acquisition [Line Items]      
Business Acquisition Cost Of Acquired Entity $ 19,650    
Equity method ownership percentage 50.00%    
Square Footage Of Real Estate Property | ft² 33,000    
Estimated Development Cost $ 104,000    
Mortgages payable $ 65,000 $ 22,500  
Debt Instrument Maturity May 2019    
Number Of Extensions Available | Extensions 2    
Length Of Extension Available 1 year    
Houston Street | Office and retail building | Joint Venture | London Interbank Offered Rate (LIBOR)      
Business Acquisition [Line Items]      
Spread Over LIBOR (in percentage) 3.00%    
Interest Rate, End of Period (in percentage)   3.52%