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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 28, 2018
Dec. 31, 2017
Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]        
Due from related parties $ 113   $ 2,415  
Other 556   556  
Investments in and advances to unconsolidated affiliates 301,717   302,070  
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,596   15,292  
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 $ 166   167  
Self Storage Management        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 95.00%      
Equity method investments $ 206   206  
Fund III        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 372   373  
Broughton St. Portfolio Savannah, GA        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 38,764   48,335  
Fund IV Other Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 15,648   20,199  
650 Bald Hill Road        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 12,993   13,609  
Fund IV        
Schedule of Equity Method Investments [Line Items]        
Equity method investments 67,405   82,143  
Core Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 233,271   216,583  
Core Portfolio | 840 N. Michigan        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 88.43%      
Equity method investments $ 66,632   69,846  
Core Portfolio | Renaissance Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 20.00%      
Equity method investments $ 32,495   35,041  
Core Portfolio | Gotham Plaza        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 49.00%      
Equity method investments $ 29,788   $ 29,416  
Core Portfolio | Town Center        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 75.22%   61.11% 22.22%
Equity method investments $ 99,741 $ 22,300 $ 78,801 $ 61,600
Core Portfolio | Georgetown Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 4,615   3,479  
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 $ 15,596   $ 15,292