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Summary of Significant Accounting Policies (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Number of Real Estate Properties 392  
Number of Units in Real Estate Property 109,347  
Noncontrolling Interests – Partially Owned Properties $ 4,643 $ 124,909
Partially Owned Properties [Member]    
Number of Real Estate Properties 19  
Number of Units in Real Estate Property 3,771  
Limited Life Partnership Properties [Member]    
Number of Real Estate Properties 6  
Noncontrolling Interests – Partially Owned Properties $ 10,997  
Noncontrolling Interests Settlement Value $ 71,800