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Investments In Joint Ventures (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
May 31, 2013
Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Jun. 30, 2013
Sale of 14 operating properties within an unconsolidated joint venture in May 2013 [Member]
Number of joint ventures accounted for under equity method investments         4            
Equity method investment ownership percentage               15.00% 20.00%    
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures     $ 0   $ 0            
Fees earned for property and asset management, construction, development, and other services to joint ventures     2,400,000 3,300,000 5,100,000 6,100,000          
Number of operating properties sold 1 1         11     14  
Number of apartment homes in operating properties sold 526 770         3,213     3,098  
Proceeds from Sale of Property, Plant, and Equipment                   200,200,000  
Gain (loss) on sale of unconsolidated JV property                   13,000,000  
Promoted equity interest in assets sold during period                     $ 3,800,000