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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage     65.00%
Due from related parties $ 2,415,000 $ 2,193,000  
Other 556,000 957,000  
Investments in and advances to unconsolidated affiliates 302,070,000 272,028,000  
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,292,000 13,691,000  
KLA Mervyns LLC      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 10.50%    
Equity method investments $ 0 0  
Fund III Other Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 167,000 8,108,000  
Self Storage Management      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 95.00%    
Equity method investments $ 206,000 241,000  
Fund III      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 373,000 8,349,000  
Broughton St. Portfolio Savannah, GA      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments $ 48,335,000 54,839,000  
Cumulative capital contribution, percentage 15.00%    
Cumulative capital contribution $ 15,400,000 14,500,000  
Preferred return percentage 9.00%    
Preferred return $ 36,800,000 45,400,000  
Fund IV Other Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 20,199,000 21,817,000  
650 Bald Hill Road      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 13,609,000 18,842,000  
Fund IV      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 82,143,000 95,498,000  
Core Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 216,583,000 165,031,000  
Core Portfolio | 840 N. Michigan      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 88.43%    
Equity method investments $ 69,846,000 74,131,000  
Core Portfolio | Renaissance Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 20.00%    
Equity method investments $ 35,041,000 36,437,000  
Core Portfolio | Gotham Plaza      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00%    
Equity method investments $ 29,416,000 29,421,000  
Core Portfolio | Market Square      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 100.00%    
Equity method investments $ 0 5,469,000  
Core Portfolio | Town Center      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 61.11%    
Equity method investments $ 78,801,000 15,286,000  
Core Portfolio | Georgetown Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments $ 3,479,000 4,287,000  
Core Portfolio | Crossroads      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00%    
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,292,000 $ 13,691,000