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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Mar. 28, 2018
Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]        
Due (to) from related parties $ (827) $ (461)    
Other 2,361 556    
Investments in and advances to unconsolidated affiliates 372,478 262,410    
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,353 15,623    
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 $ 17 21    
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 $ 223 227    
Broughton St. Portfolio Savannah, GA        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 12,650 3,236    
Fund IV Other Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 14,353 14,540    
650 Bald Hill Road        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 12,504 12,880    
Fund IV        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 39,507 30,656    
Fund V Family Center at Riverdale        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 89.42%      
Equity method investments $ 13,818 $ 0    
Fund V        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 102,387      
Tri City Plaza        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 36,106      
Washington REIT Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 52,463      
Core Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 75.22% 61.11%   22.22%
Equity method investments $ 228,827 $ 231,432 $ 22,300 $ 61,600
Core Portfolio | Renaissance Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 20.00%      
Equity method investments $ 32,458 32,458    
Core Portfolio | Gotham Plaza        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 49.00%      
Equity method investments $ 29,463 29,550    
Core Portfolio | Town Center        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 75.22%      
Equity method investments $ 98,243 99,758    
Core Portfolio | Georgetown Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 4,738 4,653    
Core Portfolio | 840 N. Michigan        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 88.43%      
Equity method investments $ 63,925 65,013    
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 $ 15,353 $ 15,623