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Property Acquisitions, Discontinued Operations, And Assets Held For Sale (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Glendale, California [Member]
A
Dec. 31, 2011
Atlanta, Georgia [Member]
A
Aug. 31, 2010
Irvine, California [Member]
Aug. 31, 2010
Irvine, California [Member]
Joint Venture Note Payable [Member]
Dec. 31, 2010
Houston, Texas And College Park, Maryland [Member]
Dec. 31, 2010
Houston, Texas And College Park, Maryland [Member]
Joint Venture Note Payable [Member]
Dec. 31, 2010
Houston, Texas And College Park, Maryland [Member]
Joint Venture Note Payable [Member]
Dec. 31, 2010
Houston, Texas And College Park, Maryland [Member]
Joint Venture Note Payable And Third Party [Member]
Aug. 31, 2010
Previous Ownership Percentage [Member]
Irvine, California [Member]
Dec. 31, 2010
Previous Ownership Percentage [Member]
Houston, Texas And College Park, Maryland [Member]
Aug. 31, 2010
New Ownership Percentage [Member]
Irvine, California [Member]
Dec. 31, 2010
New Ownership Percentage [Member]
Houston, Texas And College Park, Maryland [Member]
Jan. 31, 2012
Discontinued Operation or Asset Disposal [Member]
Dec. 31, 2011
Discontinued Operation or Asset Disposal [Member]
Dec. 31, 2010
Discontinued Operation or Asset Disposal [Member]
Dec. 31, 2009
Discontinued Operation or Asset Disposal [Member]
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Line Items]                                            
Acres of land acquired             2.2 30.1                            
Acquisitions of land             $ 21,400,000 $ 40,100,000                            
Number of joint ventures restructured         3       1   2                      
Equity method investment previous ownership percentage                             30.00% 30.00%            
Equity method investment new ownership percentage                                 99.99% 99.99%        
Increase in real estate assets                 92,700,000   146,200,000                      
Reduction to investments in joint ventures                 21,200,000   2,400,000                      
Decrease in notes receivable - affiliates                 20,700,000   14,300,000                      
Secured note, basis spread on variable rate                   2.25%   2.00% 2.00%                  
Term of secured credit agreement, years                   35                        
Proceeds from secured credit agreement   1,051,357,000 1,055,997,000 1,051,357,000 1,055,997,000         53,000,000   22,600,000 22,600,000                  
Assumed debt of the joint venture                       27,200,000                    
Secured notes payable   1,051,357,000 1,055,997,000 1,051,357,000 1,055,997,000         53,000,000   22,600,000 22,600,000                  
Repayments of assumed debt of joint venture                   52,100,000   4,600,000   108,800,000                
Notes payable, maturity date                         May 2019                  
Effective annual interest rate on secured credit                   4.35%   5.33% 5.33%                  
Contributed revenue         2,600,000                                  
Business Combination Pro Forma Information Operating Income Since Acquisition Date Actual         1,500,000                                  
Previously acquired joint venture operating income contributed in current year       12,600,000                                    
Previously acquired joint venture revenues contributed in current year       20,800,000                                    
Number of operating properties sold 1 4                                   2 2 1
Number of apartment homes sold                                     357 788    
Proceeds from the sale of property held for sale                                     24,500,000      
Impairment associated with land development activities           72,253,000                                
Costs capitalized and exit costs associated with land development joint venture           13,400,000                                
Impairment on technology investment     $ 1,000,000