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Acquisitions and Discontinued Operations (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2014
Jan. 31, 2014
acre
Dec. 31, 2013
acre
Jun. 30, 2013
acre
Dec. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2013
acre
Dec. 31, 2012
acre
Dec. 31, 2011
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]                        
Number of operating properties acquired                   3 7  
Number of apartment units in wholly owned property acquired         320 4,034       1,118 2,114  
Purchase price of operating properties acquired                   $ 225,000,000 $ 356,000,000  
Percentage of voting interests acquired         50.00% 80.00%   50.00%     50.00%  
Equity method investment ownership percentage     20.00%       20.00%     20.00%   20.00%
Number of unconsolidated equity method investments acquired         1              
Cash consideration         15,900,000 99,500,000            
Debt assumed         26,200,000 272,600,000   26,200,000     26,200,000  
Gain on acquisition of controlling interest in joint ventures         17,200,000 40,200,000   17,227,000 40,191,000 0 57,418,000 0
Acres of land acquired   2.9   38.8             22.6  
Purchase price of land acquired   15,600,000   25,800,000             33,600,000  
Pro Forma Property Revenues of Acquiree since Acquisition Date, Actual                   10,800,000 52,800,000  
Pro Forma Property Expenses of Acquiree since Acquisition Date, Actual                   4,500,000 21,000,000  
Number of apartment units in property of which noncontrolling ownership interests were acquired                     680  
Number of fully consolidated joint ventures acquired                   3    
Purchase of non-controlling interests                   0 16,482,000 0
Number of operating properties sold     2     12 2     16 11  
Number of apartment homes in operating properties sold 240   600       788     3,931 3,213  
Area of Land     3.7             3.7    
Proceeds from Sale of Land Held-for-investment                   6,600,000    
Gain on sale of properties, including land                   698,000 0 4,748,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual, included in Discontinued Operations                     6,400,000  
Business Combination Pro Forma Information Expenses of Acquiree since Acquisition Date, Actual included in Discontinued Operations                     $ 3,100,000