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Investment in Consolidated and Unconsolidated Entities - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Variable Interest Entity [Line Items]        
Investment in unconsolidated entities, impairment loss $ 29,933,000 $ 0 $ 0  
Investment in unconsolidated entities $ 156,132,000 180,764,000    
Realized gain (loss) on disposal     1,434,000  
Number of retail properties impaired | property 3      
Proceeds from sale and transfer of investment properties, net $ 430,514,000 233,686,000 1,580,994,000  
Provision for asset impairment 3,510,000 27,754,000 117,722,000  
Unconsolidated Entity 1        
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    
IAGM Retail Fund I, LLC | Bryant Square        
Variable Interest Entity [Line Items]        
Proceeds from sale and transfer of investment properties, net 2,274,000      
Provision for asset impairment $ 2,020,000      
IAGM Retail Fund I, LLC | Bryant Square | Retail        
Variable Interest Entity [Line Items]        
Number of retail properties impaired | property 2      
Proceeds from sale and transfer of investment properties, net $ 4,135,000      
Unconsolidated Entities        
Variable Interest Entity [Line Items]        
Investment in unconsolidated entities, impairment loss 29,933,000 0 $ 0  
Investment in unconsolidated entities 156,132,000 180,764,000    
Unconsolidated Entities | Downtown Railyard Venture, LLC        
Variable Interest Entity [Line Items]        
Investment in unconsolidated entities, impairment loss 29,933,000      
Investment in unconsolidated entities 30,049,000 57,183,000   $ 46,174,000
Unconsolidated Entities | IAGM Retail Fund I, LLC        
Variable Interest Entity [Line Items]        
Investment in unconsolidated entities, impairment loss 3,673,000      
Investment in unconsolidated entities $ 126,195,000 123,693,000    
Number of retail properties impaired | property 3      
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