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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
ft²
property
Apr. 29, 2016
USD ($)
Jan. 31, 2016
USD ($)
ft²
shares
Dec. 31, 2016
USD ($)
ft²
shares
Dec. 31, 2015
USD ($)
shares
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage           65.00%
Purchase Price       $ 756,842 $ 451,220  
Common Shares            
Schedule of Equity Method Investments [Line Items]            
Issuance of Common Shares, net of issuance costs (in Shares) | shares       4,830,000 1,600,000  
Gotham Plaza [Member] | Common Shares            
Schedule of Equity Method Investments [Line Items]            
Issuance of Common Shares, net of issuance costs (in Shares) | shares     442,478      
Gotham Plaza [Member] | Preferred OP Units [Member]            
Schedule of Equity Method Investments [Line Items]            
Issuance of Common Shares, net of issuance costs (in Shares) | shares     141,593      
Core Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Purchase Price       $ 519,592 $ 204,243  
Core Portfolio [Member] | Crossroads [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       49.00%    
Square footage of real estate property (in square feet) | ft²       311    
Core Portfolio [Member] | Georgetown Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       50.00%    
Square footage of real estate property (in square feet) | ft²       28    
Core Portfolio [Member] | Gotham Plaza [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       49.00%    
Square footage of real estate property (in square feet) | ft²     123      
Percentage of voting interests acquired     49.00%      
Purchase Price     $ 39,800      
Percentage of long-term debt assumed     49.00%      
Long-term debt assumed     $ 21,400      
Core Portfolio [Member] | Gotham Plaza [Member] | Common Shares            
Schedule of Equity Method Investments [Line Items]            
Issuance of Common Shares, net of issuance costs (in Shares) | shares     442,478      
Core Portfolio [Member] | Gotham Plaza [Member] | Preferred OP Units [Member]            
Schedule of Equity Method Investments [Line Items]            
Issuance of Common Shares, net of issuance costs (in Shares) | shares     141,593      
Core Portfolio [Member] | Renaissance Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       20.00%    
Square footage of real estate property (in square feet) | ft² 211          
Percentage of voting interests acquired 20.00%          
Purchase Price $ 67,600          
Long-term debt assumed $ 20,000          
Number of businesses acquired | property 17          
Core Portfolio [Member] | Brandywine Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       22.22%    
Square footage of real estate property (in square feet) | ft²       1,000    
Repayments of debt   $ 140,000        
Core Portfolio [Member] | Chicago, Illinois [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage       88.43%    
Square footage of real estate property (in square feet) | ft²       87    
Core Portfolio [Member] | Washington D.C. [Member] | Renaissance Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of businesses acquired | property 16          
Core Portfolio [Member] | Alexandria, Virginia [Member] | Renaissance Portfolio [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of businesses acquired | property 1