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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Variable Interest Entity [Line Items]        
Acquisition date fair value $ 566,194,000 $ 439,335,000    
Land 125,990,000 154,737,000    
Building and other improvements 440,204,000 284,598,000    
Investment in unconsolidated entities 180,764,000 178,728,000    
Realized gain (loss) on disposal   1,434,000    
Gain, (loss) and (impairment) of investment in unconsolidated entities, net 0 1,434,000 $ 326,000  
PLAZA MIDTOWN Atlanta, GL        
Variable Interest Entity [Line Items]        
Acquisition date fair value 10,790,000      
Land 1,963,000      
Building and other improvements 8,827,000      
Unconsolidated Entity 1 [Member]        
Variable Interest Entity [Line Items]        
Proceeds from equity method investment, dividends or distributions, return of capital 366,000      
Investment in unconsolidated entities 0      
Realized gain (loss) on disposal 0      
Unconsolidated Entities [Member]        
Variable Interest Entity [Line Items]        
Equity method investment, other than temporary impairment 0 0 0  
Investment in unconsolidated entities 180,764,000 178,728,000    
Gain, (loss) and (impairment) of investment in unconsolidated entities, net     326,000  
Debt, net 312,233,000      
Unconsolidated Entities [Member] | Downtown Railyard Venture, LLC [Member]        
Variable Interest Entity [Line Items]        
Proceeds from equity method investment, dividends or distributions, return of capital     $ 4,092,000  
Investment in unconsolidated entities 57,183,000 $ 52,365,000   $ 46,174,000
IAGM Retail Fund I, LLC [Member]        
Variable Interest Entity [Line Items]        
Recourse debt $ 23,000,000