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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue Recognition, New Accounting Pronouncement, Material Effect, Description 21.9      
Amortization of Below Market Lease     $ 100  
Average amortization period for below market leases and in-place leases 6 months   8 months  
Capitalized interest $ 15,200 $ 18,200 $ 19,300  
Capitalized real estate taxes 2,400 4,500 3,600  
Outstanding notes receivable $ 18,790 $ 17,224 $ 13,161 $ 3,395
Weighted average interest rate on outstanding notes receivable 4.00% 4.00%    
Percentage Of Rental Revenue And Other Income From Leasing Of Apartment Homes 99.00% 99.00% 99.00%  
Amortization of in-place leases $ 1,300   $ 500