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Equity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2014
May 01, 2014
Jan. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Equity                
Dividends declared per common share (in dollars per share) $ 0.545 $ 0.545 $ 0.545 $ 0.545 $ 0.525 $ 1.09 $ 1.05  
Noncontrolling interests                
DownREIT unit, carrying value       $ 189,072,000   $ 189,072,000   $ 184,105,000
Accumulated Other Comprehensive Loss                
Unrealized losses on available for sale securities       (4,000)   (4,000)    
Unrealized losses on cash flow hedges, net       (10,846,000)   (10,846,000)   (10,797,000)
Supplemental Executive Retirement Plan minimum liability       (2,802,000)   (2,802,000)   (2,910,000)
Cumulative foreign currency translation adjustment       1,983,000   1,983,000   (780,000)
Total accumulated other comprehensive loss       (11,669,000)   (11,669,000)   (14,487,000)
Common Stock
                
Company's common stock issuances                
Dividend Reinvestment and Stock Purchase Plan (in shares)           1,386 925  
Conversion of DownREIT units (in shares)           2 85  
Exercise of stock options (in shares)           111 852  
Vesting of restricted stock units (in shares)           567 103  
Total Noncontrolling Interests
                
Noncontrolling interests                
Non-managing members DownREIT units outstanding       4,000,000   4,000,000    
Number of DownREIT LLCs       5   5    
DownREIT unit, carrying value       189,000,000   189,000,000    
DownREIT unit, fair value       $ 253,000,000   $ 253,000,000