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Real Estate Investments Development Co-Investments (Details)
$ in Thousands
1 Months Ended
Jul. 31, 2014
USD ($)
apartment
Dec. 31, 2015
USD ($)
apartment
Aug. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
apartment
Dec. 31, 2014
USD ($)
apartment
Real Estate Properties [Line Items]            
Co-investment   $ 1,036,047 $ 20,400 $ 13,700   $ 1,042,423
Total development co investments [Member]            
Real Estate Properties [Line Items]            
Number Of apartments owned through joint ventures | apartment   1,676       2,296
Co-investment   $ 190,808       $ 121,655
Total development co investments [Member] | Minimum [Member]            
Real Estate Properties [Line Items]            
Equity method investment, ownership percentage   50.00%        
Total development co investments [Member] | Maximum [Member]            
Real Estate Properties [Line Items]            
Equity method investment, ownership percentage   55.00%        
Folsom 500 [Member]            
Real Estate Properties [Line Items]            
Equity method investment, ownership percentage         50.00%  
Number of units to be developed | apartment         545  
Estimated cost active development projects         $ 381,000  
Active development projects estimated costs to be expended   $ 319,200        
Remaining estimated cost to be contributed by Company   159,600        
Century Towers [Member]            
Real Estate Properties [Line Items]            
Equity method investment, ownership percentage 50.00%          
Number of units to be developed | apartment 376          
Estimated cost active development projects $ 172,100          
Active development projects estimated costs to be expended           $ 78,900
Remaining estimated cost to be contributed by Company   $ 39,400        
Co-investment $ 27,000          
Preferred stock dividend rate percentage 8.10%