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Investment in Consolidated and Unconsolidated Entities - Net Equity Investment and Share of Net Income (Details)
$ in Thousands, ft² in Millions
Mar. 31, 2018
USD ($)
Mar. 31, 2018
Properties
Mar. 31, 2018
ft²
Mar. 31, 2018
Dec. 31, 2017
USD ($)
ft²
Properties
Mar. 31, 2017
ft²
Schedule of net equity investment and share of net income or loss            
Carrying value of investment $ 188,714       $ 180,764  
Number of retail properties   14   2 15  
Square Feet | ft²     3.0   3.2 0.3
IAGM Retail Fund I, LLC            
Schedule of net equity investment and share of net income or loss            
Ownership %       55.00%    
Carrying value of investment 131,603       $ 123,693  
Downtown Railyard Venture, LLC            
Schedule of net equity investment and share of net income or loss            
Ownership %       90.00%    
Carrying value of investment 57,223       57,183  
Other unconsolidated entities            
Schedule of net equity investment and share of net income or loss            
Carrying value of investment $ (112)       $ (112)