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Earnings Per Common Share of MAA - Schedule of Computation of Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share Disclosure [Line Items]        
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 87,047 $ 62,036 $ 359,786 $ 177,716
Income from continuing operations attributable to noncontrolling interests (2,568) (2,126) (11,636) (6,096)
Income from continuing operations allocated to unvested restricted shares (80) (78) (359) (229)
Dividends on preferred stock (922) (922) (2,766) (2,766)
Income from continuing operations available for common shareholders, adjusted $ 83,477 $ 58,910 $ 345,025 $ 168,625
Weighted average common shares - basic 114,933 114,216 114,568 114,177
Earnings per share - basic $ 0.73 $ 0.52 $ 3.01 $ 1.48
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 87,047 $ 62,036 $ 359,786 $ 177,716
Income from continuing operations attributable to noncontrolling interests [1] (2,568) (2,126) (11,636) (6,096)
Net income available for MAA common shareholders, adjusted $ 83,557 $ 58,988 $ 345,384 $ 168,854
Effect of dilutive securities 296 252 305 310
Weighted average common shares - diluted 115,229 114,468 114,873 114,487
Earnings per common share - diluted $ 0.73 $ 0.52 $ 3.01 $ 1.47
Limited Partnership Units [Member]        
Earnings Per Share Disclosure [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,500 4,100 3,800 4,100
[1] For the three and nine months ended September 30, 2021 3.5 million OP Units and 3.8 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the three and nine months ended September 30, 2020, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.