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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2019
USD ($)
home
Mar. 31, 2019
USD ($)
entity
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Equity method investment        
Equity method investment, difference between carrying amount and underlying equity   $ 30,866   $ 31,188
Payments to Acquire Other Real Estate   $ 91,548 $ 0  
Unconsolidated real estate entities        
Equity method investment        
Number of unconsolidated real estate entities | entity   6    
Avalon Brooklyn Bay        
Equity method investment        
Variable interest entity, qualitative or quantitative information, ownership percentage   70.00%    
Variable interest entity, ownership interest by partner   30.00%    
Due from related parties   $ 11,925   $ 12,819
Avalon Brooklyn Bay Rental Apartments [Member]        
Equity method investment        
Variable interest entity, qualitative or quantitative information, ownership percentage   100.00%    
Avalon Brooklyn Bay Condominiums [Member]        
Equity method investment        
Variable interest entity, ownership interest by partner   100.00%    
Minimum | Unconsolidated real estate entities        
Equity method investment        
Equity Method Investment, Ownership Percentage   20.00%    
Maximum | Unconsolidated real estate entities        
Equity method investment        
Equity Method Investment, Ownership Percentage   55.00%    
Ridge at Wheatlands [Member]        
Equity method investment        
Number of Apartment Homes Acquired | home 338      
Payments to Acquire Other Real Estate $ 91,250