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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2020
USD ($)
Aug. 08, 2019
USD ($)
Jan. 24, 2019
USD ($)
ft²
Mar. 28, 2018
USD ($)
Nov. 16, 2017
USD ($)
May 01, 2017
USD ($)
Apr. 29, 2016
USD ($)
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                        
Purchase Price                 $ 172,152,000 $ 324,339,000    
Cost method investments               $ 1,881,000 1,881,000 1,932,000    
Gain (loss) on investment                 113,930,000 6,947,000    
Notes receivable, net               $ 101,450,000 $ 101,450,000 114,943,000 $ 111,775,000 $ 160,991,000
Acadia Brandywine Holdings, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership percentage               22.22% 22.22%      
Core Portfolio                        
Schedule of Equity Method Investments [Line Items]                        
Purchase Price                 $ 158,143,000 146,435,000    
Cost method investments               $ 1,700,000 1,700,000      
Impairment of Investment               $ 400,000        
Gain (loss) on investment                 $ 0      
Equity method investment, ownership percentage by third party       14.11% 38.89%              
Equity method investment, ownership percentage         22.22%     75.22% 75.22%   61.11%  
Equity method investments       $ 22,300,000 $ 61,600,000     $ 121,011,000 $ 121,011,000 225,907,000    
Gain on equity method investment       12,700,000 34,500,000              
Core Portfolio | Renaissance Portfolio                        
Schedule of Equity Method Investments [Line Items]                        
Percentage of voting interests acquired     20.00%                  
Equity method investment, ownership percentage               20.00% 20.00%      
Equity method investments               $ 29,270,000 $ 29,270,000 31,815,000    
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P.                        
Schedule of Equity Method Investments [Line Items]                        
Cost method investments   $ 1,800,000           $ 200,000 $ 200,000      
Maximum amount commitment to invest   $ 5,000,000.0                    
Cost method investment ownership percentage   5.00%                    
Core Portfolio | Brandywine Portfolio                        
Schedule of Equity Method Investments [Line Items]                        
Square footage of real estate property (in square feet) | ft²               1,000,000 1,000,000      
Repayments of debt             $ 140,000,000.0          
Note receivable exchanged $ 38,700,000     22,000,000.0   $ 16,000,000.0            
Notes receivable, net           153,400,000            
Note receivable accrued interest $ 2,000,000.0     $ 300,000   $ 300,000            
Equity method investment, ownership percentage by third party 24.78%                      
Equity method investment, controlling interest percentage 100.00%                      
Core Portfolio | Brandywine Portfolio | Exchange Transaction One                        
Schedule of Equity Method Investments [Line Items]                        
Note receivable exchanged         16,000,000.0              
Note receivable accrued interest         600,000              
Core Portfolio | Brandywine Portfolio | Exchange Transaction Two                        
Schedule of Equity Method Investments [Line Items]                        
Note receivable exchanged         60,700,000              
Note receivable accrued interest         $ 900,000              
Core Portfolio | Market Square                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership percentage by third party         38.89% 38.89%            
Equity method investment, ownership percentage         22.22% 61.11%            
Equity method investments           $ 16,300,000            
Gain on equity method investment           $ 9,800,000            
Core Portfolio | Town Center                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership percentage by third party 24.78%                      
Equity method investment, ownership percentage               100.00% 100.00%      
Equity method investments                   $ 97,674,000    
Equity method investment, controlling interest percentage           100.00%            
Core Portfolio | Washington, D.C. | Renaissance Portfolio                        
Schedule of Equity Method Investments [Line Items]                        
Square footage of real estate property (in square feet) | ft²     7,300                  
Purchase Price     $ 10,700,000                  
Purchase price less the assumption of the outstanding mortgage     $ 4,700,000