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Equity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
May 01, 2014
Jan. 30, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Equity          
Dividends declared per common share (in dollars per share) $ 0.545 $ 0.545 $ 0.545 $ 0.525  
Noncontrolling interests          
DownREIT unit, carrying value     $ 184,032,000   $ 184,105,000
Accumulated Other Comprehensive Loss          
Unrealized gains on available for sale securities     3,000    
Unrealized losses on cash flow hedges, net     (10,887,000)   (10,797,000)
Supplemental Executive Retirement Plan minimum liability     (2,856,000)   (2,910,000)
Cumulative foreign currency translation adjustment     (830,000)   (780,000)
Total accumulated other comprehensive loss     (14,570,000)   (14,487,000)
Common Stock
          
Company's common stock issuances          
Dividend Reinvestment and Stock Purchase Plan (in shares)     875 382  
Conversion of DownREIT units (in shares)     2 51  
Exercise of stock options (in shares)     4 796  
Vesting of restricted stock units (in shares)     411 17  
Total Noncontrolling Interests
          
Noncontrolling interests          
Non-managing members DownREIT units outstanding     4,000,000    
Number of DownREIT LLCs     4    
DownREIT unit, carrying value     184,000,000    
DownREIT unit, fair value     $ 232,000,000