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Real Estate Investments - Operating, Pre-Development, and Development Co-Investments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
unit
Dec. 31, 2017
USD ($)
unit
Dec. 31, 2019
USD ($)
unit
Dec. 31, 2015
USD ($)
unit
Real Estate Properties [Line Items]        
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures $ 1,018,010   $ 1,335,339  
Number of units to be developed | unit 1,853      
Total Operating Co-investments        
Real Estate Properties [Line Items]        
Number of apartments owned through joint ventures | unit 8,652   10,672  
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures $ 358,266   $ 743,461  
Total Development Co-Investments        
Real Estate Properties [Line Items]        
Number of apartments owned through joint ventures | unit 1,070   806  
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures $ 157,433   $ 146,944  
Mesa Village        
Real Estate Properties [Line Items]        
Number of units to be developed | unit 264      
Equity method investment, ownership percentage 51.00%      
Estimated cost active development projects $ 102,000      
Purchase commitment, funded amount $ 5,900      
Annualized preferred return rate 10.00%      
Ohlone Multi-Family Community        
Real Estate Properties [Line Items]        
Number of units to be developed | unit   269    
Equity method investment, ownership percentage   50.00%    
Estimated cost active development projects   $ 148,000    
Purchase commitment, funded amount   $ 28,900    
Annualized preferred return rate   10.00%    
Folsom 500        
Real Estate Properties [Line Items]        
Number of units to be developed | unit       537
Equity method investment, ownership percentage       50.00%
Estimated cost active development projects       $ 415,000