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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share Disclosure [Line Items]        
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 64,141 $ 61,981 $ 130,099 $ 112,801
Income from continuing operations attributable to noncontrolling interests (2,224) (2,174) (4,522) (3,975)
Income from continuing operations allocated to unvested restricted shares (96) (78) (184) (142)
Dividends, Preferred Stock, Cash (922) (922) (1,844) (1,844)
Income from continuing operations available for common shareholders, adjusted $ 60,899 $ 58,807 $ 123,549 $ 106,840
Weighted average common shares - basic 113,838 113,646 113,783 113,595
Earnings per share - basic $ 0.53 $ 0.52 $ 1.09 $ 0.94
Income from Continuing Operations, Including Portion Attributable to Noncontrolling Interest $ 64,141 $ 61,981 $ 130,099 $ 112,801
Income from continuing operations attributable to noncontrolling interests [1] (2,224) (2,174) (4,522) (3,975)
Adjusted Income (Loss) from Continuing Operations Available for Common Shareholders, Diluted $ 60,995 $ 58,885 $ 123,733 $ 106,982
Effect of dilutive securities 249 207 211 174
Weighted average common shares - diluted 114,087 113,853 113,994 113,769
Earnings per share - diluted $ 0.53 $ 0.52 $ 1.09 $ 0.94
Limited Partnership Units [Member]        
Earnings Per Share Disclosure [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,100 4,100 4,100 4,200
[1] For the three months ended June 30, 2019 and June 30, 2018, 4.1 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive. For the six months ended June 30, 2019 and June 30, 2018, 4.1 million OP Units and 4.2 million OP Units, respectively, and their related income are not included in the diluted earnings per share calculations as they are not dilutive.