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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
home
entity
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
community
entity
home
Jun. 30, 2020
USD ($)
Equity method investment        
Casualty and impairment loss $ 1,177 $ 0 $ 1,177 $ 0
Payments to Acquire Other Real Estate     $ 118,572 0
AC JV        
Equity method investment        
Number of Apartment Communities Sold | community     2  
Land Parcel [Member]        
Equity method investment        
Casualty and impairment loss 0 0 $ 0 0
The Park Loggia [Member]        
Equity method investment        
Casualty and impairment loss 0 $ 0 0 $ 0
Proceeds from Sale of Real Estate $ 38,392   53,001  
Avalon Arundel Crossing East        
Equity method investment        
Number of Apartment Homes Acquired | home 384      
Payments to Acquire Other Real Estate $ 119,000      
Avalon North Point and Avalon North Point Lofts | Notes Payable Maturities 2021 [Member] | Secured Debt [Member]        
Equity method investment        
Repayments of Secured Debt     $ 111,653  
Unconsolidated real estate entities        
Equity method investment        
Number of unconsolidated real estate entities | entity 8   8  
AC JV        
Equity method investment        
Proceeds from Sale of Real Estate     $ 325,000  
AC JV | Avalon North Point and Avalon North Point Lofts        
Equity method investment        
Number Of Apartment Homes Sold | home     529  
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 23,305  
Minimum | Unconsolidated real estate entities        
Equity method investment        
Ownership percentage 20.00%   20.00%  
Maximum | Unconsolidated real estate entities        
Equity method investment        
Ownership percentage 50.00%   50.00%