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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 28, 2018
Dec. 31, 2017
Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]          
Due from related parties $ (701) $ (461)      
Other 556 556      
Investments in and advances to unconsolidated affiliates 309,349 262,410      
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,415 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 $ 3,149 3,236      
Fund IV Other Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 13,922 14,540      
650 Bald Hill Road          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 12,704 12,880      
Fund IV          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 29,775 30,656      
Fund V Family Center at Riverdale          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 48,610 0      
Core Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 230,886 231,432      
Core Portfolio | 840 N. Michigan          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 88.43%        
Equity method investments $ 64,561 65,013      
Core Portfolio | Renaissance Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 20.00%        
Equity method investments $ 33,059 32,458      
Core Portfolio | Gotham Plaza          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 49.00%        
Equity method investments $ 29,399 29,550      
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 $ 99,106 99,758 $ 22,300   $ 61,600
Core Portfolio | Georgetown Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%        
Equity method investments $ 4,761 4,653      
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 $ 15,415 $ 15,623