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Equity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2014
May 01, 2014
Jan. 30, 2014
Oct. 30, 2013
Oct. 02, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Equity                    
Dividends declared per common share (in dollars per share) $ 0.545 $ 0.545 $ 0.545 $ 0.545   $ 0.545 $ 0.525 $ 1.635 $ 1.575  
Noncontrolling interests                    
DownREIT unit, carrying value           $ 189,072,000   $ 189,072,000   $ 184,105,000
Severance-related charges                    
Severance Costs         26,400,000          
Increase in Deferred Compensation         16,700,000          
Severance Payments and Other Costs         9,700,000          
Accumulated Other Comprehensive Loss                    
Unrealized losses on available for sale securities           (5,000)   (5,000)    
Unrealized losses on cash flow hedges, net           (9,734,000)   (9,734,000)   (10,797,000)
Supplemental Executive Retirement Plan minimum liability           (2,747,000)   (2,747,000)   (2,910,000)
Cumulative foreign currency translation adjustment           (4,978,000)   (4,978,000)   (780,000)
Total accumulated other comprehensive loss           (17,464,000)   (17,464,000)   (14,487,000)
Common Stock
                    
Company's common stock issuances                    
Dividend Reinvestment and Stock Purchase Plan (in shares)               1,775 1,681  
Conversion of DownREIT units (in shares)               2 85  
Exercise of stock options (in shares)               131 875  
Vesting of restricted stock units (in shares)               575 110  
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           $ 242,000,000   $ 242,000,000