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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

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