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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 28, 2018
Nov. 16, 2017
Schedule of Equity Method Investments [Line Items]          
Due from (to) Related Parties $ 363 $ (1,902)      
Other 1,881 1,932      
Investments in and advances to unconsolidated affiliates 249,807 305,097      
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,616 15,362      
KLA/ABS          
Schedule of Equity Method Investments [Line Items]          
Cost method investment, ownership percentage 36.70%        
Cost Method Investment $ 72,391 402      
Fund III Other Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 94.23%        
Equity method investments   17      
Self Storage Management          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 95.00%        
Equity method investments $ 207 207      
Fund III          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 207 224      
Broughton St. Portfolio Savannah, GA          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 100.00%        
Equity method investments   12,702      
Fund IV Other Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 98.57%        
Equity method investments $ 11,719 14,733      
650 Bald Hill Road          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 12,550 12,450      
Fund IV          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 24,269 39,885      
Fund V Family Center at Riverdale          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 89.42%        
Equity method investments $ 11,824 13,329      
Tri City Plaza          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 7,024 10,250      
Frederick County Acquisitions          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 90.00%        
Equity method investments $ 10,837 15,070      
Fund V          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 29,685 38,649      
Core Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 75.22%   61.11%   22.22%
Equity method investments $ 121,011 225,907   $ 22,300 $ 61,600
Other $ 1,700        
Core Portfolio | 840 N. Michigan          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 88.43%        
Equity method investments $ 55,863 61,260      
Core Portfolio | Renaissance Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 20.00%        
Equity method investments $ 29,270 31,815      
Core Portfolio | Gotham Plaza          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 49.00%        
Equity method investments $ 28,683 29,466      
Core Portfolio | Town Center          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 100.00%        
Equity method investments   97,674      
Core Portfolio | Georgetown Portfolio          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%        
Equity method investments $ 4,624 4,498      
Core Portfolio | 1238 Wisconsin Avenue          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 80.00%        
Equity method investments $ 2,571 1,194      
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 $ 15,616 $ 15,362