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Organization, Basis of Presentation and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic and diluted shares outstanding            
Weighted average common shares - basic (in shares) 139,630,291   139,373,963   139,595,098 139,332,575
Weighted average DownREIT units outstanding (in shares) 7,500   7,500   7,500 7,500
Effect of dilutive securities (in shares) 296,687   269,176   352,682 261,451
Weighted average common shares - diluted (in shares) 139,934,478   139,650,639   139,955,280 139,601,526
Calculation of Earnings per Share - basic            
Net income attributable to common stockholders $ 138,691 $ 262,044 $ 447,953 $ 142,223 $ 400,735 $ 590,176
Net income allocated to unvested restricted shares (247)   (902)   (756) (1,267)
Net income attributable to common stockholders, adjusted $ 138,444   $ 447,051   $ 399,979 $ 588,909
Weighted average common shares - basic (in shares) 139,630,291   139,373,963   139,595,098 139,332,575
Earnings per common share - basic (in dollars per share) $ 0.99   $ 3.21   $ 2.87 $ 4.23
Calculation of Earnings per Share - diluted            
Net income attributable to common stockholders $ 138,691 $ 262,044 $ 447,953 $ 142,223 $ 400,735 $ 590,176
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations 12   12   24 24
Adjusted net income attributable to common stockholders $ 138,703   $ 447,965   $ 400,759 $ 590,200
Weighted average common shares - diluted (in shares) 139,934,478   139,650,639   139,955,280 139,601,526
Earnings per common share - diluted (in dollars per share) $ 0.99   $ 3.21   $ 2.86 $ 4.23
Antidilutive securities excluded from the computation of earnings per share (in shares)         8,222 292,544