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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic and diluted shares outstanding            
Weighted average common shares - basic (in shares) 142,004,857   141,779,951   141,953,462 140,773,339
Weighted average DownREIT units outstanding (in shares) 0   6,511   0 7,005
Effect of dilutive securities (in shares) 385,009   337,655   352,848 293,620
Weighted average common shares - diluted (in shares) 142,389,866   142,124,117   142,306,310 141,073,964
Calculation of Earnings per Common Share - basic            
Net income attributable to common stockholders $ 253,934 $ 173,449 $ 367,923 $ 146,902 $ 427,383 $ 514,825
Net income allocated to unvested restricted shares (488)   (645)   (827) (919)
Net income attributable to common stockholders - basic $ 253,446   $ 367,278   $ 426,556 $ 513,906
Weighted average common shares - basic (in shares) 142,004,857   141,779,951   141,953,462 140,773,339
Earnings per common share - basic (in dollars per share) $ 1.78   $ 2.59   $ 3.00 $ 3.65
Calculation of Earnings per Common Share - diluted            
Net income attributable to common stockholders $ 253,934 $ 173,449 $ 367,923 $ 146,902 $ 427,383 $ 514,825
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations 0   13   0 25
Net income attributable to common stockholders - diluted $ 253,934   $ 367,936   $ 427,383 $ 514,850
Weighted average common shares - diluted (in shares) 142,389,866   142,124,117   142,306,310 141,073,964
Earnings per common share - diluted (in dollars per share) $ 1.78   $ 2.59   $ 3.00 $ 3.65
Antidilutive securities excluded from the computation of earnings per share (in shares)         38,231 303,784