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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 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Basic and diluted shares outstanding                
Weighted average common shares - basic (in shares) 141,838,841     139,640,421     141,128,506 139,610,205
Weighted average DownREIT units outstanding (in shares) 0     7,500     4,670 7,500
Effect of dilutive securities (in shares) 359,258     334,038     315,499 346,467
Weighted average common shares - diluted (in shares) 142,198,099     139,981,959     141,448,675 139,964,172
Calculation of Earnings per Share - basic                
Net income attributable to common stockholders $ 172,031 $ 367,923 $ 146,902 $ 494,747 $ 138,691 $ 262,044 $ 686,856 $ 895,482
Net income allocated to unvested restricted shares (309)     (888)     (1,229) (1,662)
Net income attributable to common stockholders - basic $ 171,722     $ 493,859     $ 685,627 $ 893,820
Weighted average common shares - basic (in shares) 141,838,841     139,640,421     141,128,506 139,610,205
Earnings per common share - basic (in dollars per share) $ 1.21     $ 3.54     $ 4.86 $ 6.40
Calculation of Earnings per Share - diluted                
Net income attributable to common stockholders $ 172,031 $ 367,923 $ 146,902 $ 494,747 $ 138,691 $ 262,044 $ 686,856 $ 895,482
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations 0     12     25 36
Net income attributable to common stockholders - diluted $ 172,031     $ 494,759     $ 686,881 $ 895,518
Weighted average common shares - diluted (in shares) 142,198,099     139,981,959     141,448,675 139,964,172
Earnings per common share - diluted (in dollars per share) $ 1.21     $ 3.53     $ 4.86 $ 6.40
Antidilutive securities excluded from the computation of earnings per share (in shares)             25,537 9,793