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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details)
$ in Thousands, ft² in Millions
3 Months Ended 12 Months Ended
Jan. 04, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 28, 2021
USD ($)
Apr. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 08, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule Of Equity Method Investments [Line Items]                    
Notes receivable, net   $ 100,882   $ 153,886 $ 100,882     $ 114,943   $ 111,775
Investment Owned At Cost   $ 1,881   3,811 $ 1,881          
Acadia Brandywine Holdings, LLC                    
Schedule Of Equity Method Investments [Line Items]                    
Equity method investment, ownership percentage   22.22%     22.22%          
Riverdale                    
Schedule Of Equity Method Investments [Line Items]                    
Venture Capital Gain (Loss), Net       3,200            
Proceeds from sale of property $ 10,500                  
Repayment related to mortgage 7,900                  
Recognized gain in shares amount 600                  
1238 Wisconsin Avenue                    
Schedule Of Equity Method Investments [Line Items]                    
Construction loan commitment           $ 12,800        
Origination fee           $ 100        
Subscription Agreement [Member]                    
Schedule Of Equity Method Investments [Line Items]                    
General Partners' Contributed Capital       5,400            
Increase in Investment       1,900            
Investment Owned At Cost       7,500            
Core Portfolio                    
Schedule Of Equity Method Investments [Line Items]                    
Equity method investments   $ 121,011   119,150 $ 121,011     $ 200 $ 1,800  
Increase in Investment       1,900 $ 400          
Investment Owned At Cost       $ 3,700            
Impairment of Investment     $ 400              
Total Commitment                 $ 5,000  
Core Portfolio | Brandywine Portfolio                    
Schedule Of Equity Method Investments [Line Items]                    
Note receivable exchanged $ 38,700                  
Note receivable accrued interest             $ 2,000      
Equity method investment, controlling interest percentage             100.00%      
Square footage of real estate property (in square feet) | ft²       1            
Equity method investment, ownership percentage       100.00%            
Cost method investment ownership percentage             24.78%      
Debt Conversion, Converted Instrument, Amount       $ 140,000            
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P.                    
Schedule Of Equity Method Investments [Line Items]                    
Investment Owned At Cost             $ 400      
Impairment of Investment   $ 400                
Core Portfolio | Town Center                    
Schedule Of Equity Method Investments [Line Items]                    
Equity method investment, ownership percentage by third party             24.78%