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Organization, Basis of Presentation and Significant Accounting Policies (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic and diluted shares outstanding            
Weighted average common shares - basic (in shares) 139,373,963   140,450,744   139,332,575 140,413,857
Weighted average DownREIT units outstanding (in shares) 7,500   7,500   7,500 7,500
Effect of dilutive securities (in shares) 269,176   279,916   261,451 330,974
Weighted average common shares - diluted (in shares) 139,650,639   140,738,160   139,601,526 140,752,331
Calculation of Earnings per Share - basic            
Net income attributable to common stockholders $ 447,953 $ 142,223 $ 170,828 $ 167,971 $ 590,176 $ 338,799
Net income allocated to unvested restricted shares (902)   (390)   (1,267) (817)
Net income attributable to common stockholders, adjusted $ 447,051   $ 170,438   $ 588,909 $ 337,982
Weighted average common shares - basic (in shares) 139,373,963   140,450,744   139,332,575 140,413,857
Earnings per common share - basic (in dollars per share) $ 3.21   $ 1.21   $ 4.23 $ 2.41
Calculation of Earnings per Share - diluted            
Net income attributable to common stockholders $ 447,953 $ 142,223 $ 170,828 $ 167,971 $ 590,176 $ 338,799
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships 12   12   24 24
Adjusted net income attributable to common stockholders $ 447,965   $ 170,840   $ 590,200 $ 338,823
Weighted average common shares - diluted (in shares) 139,650,639   140,738,160   139,601,526 140,752,331
Earnings per common share - diluted (in dollars per share) $ 3.21   $ 1.21   $ 4.23 $ 2.41
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount         292,544