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Related Party Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Amounts due from/to related parties            
Due from joint ventures $ 1,240 $ 16,736   $ 16,736    
Other 14,616 7,332   7,332    
Related party receivables $ 15,856 24,068   24,068    
Alliance Building Services            
Related Party Transactions            
Profit participation from related party   1,000 $ 800 3,000 $ 2,600  
Payments made for services   5,700 5,300 16,000 16,100  
Entity with Stephen L Green ownership interest            
Related Party Transactions            
Property management fees from related party   100 $ 100 400 $ 300  
One Vanderbilt            
Related Party Transactions            
Due from related party, percentage received (as a percentage) 50.00%          
One Vanderbilt | Marc Holliday            
Related Party Transactions            
Due from related party   1,400   1,400    
One Vanderbilt | Andrew Mathias            
Related Party Transactions            
Due from related party   $ 1,000   $ 1,000    
One Vanderbilt | Minimum | Marc Holliday            
Related Party Transactions            
Percentage of profits due to investors (as a percentage) 1.50%          
One Vanderbilt | Minimum | Andrew Mathias            
Related Party Transactions            
Percentage of profits due to investors (as a percentage) 1.00%          
One Vanderbilt | Maximum | Marc Holliday            
Related Party Transactions            
Percentage of profits due to investors (as a percentage) 1.80%          
One Vanderbilt | Maximum | Andrew Mathias            
Related Party Transactions            
Percentage of profits due to investors (as a percentage) 1.20%          
Scenario, Forecast | One Vanderbilt            
Related Party Transactions            
Due from related party, percentage received (as a percentage)           50.00%