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Earnings Per Common Share of MAA (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Common Share of MAA [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | Basic earnings per share is computed by dividing net income available to MAA common shareholders by the weighted average number of common shares outstanding during the period. All outstanding unvested restricted share awards contain rights to non-forfeitable dividends and participate in undistributed earnings with shareholders and, accordingly, are considered participating securities that are included in the two-class method of computing basic earnings per share. Both the unvested restricted shares and other potentially dilutive common shares, and the related impact to earnings, are considered when calculating earnings per share on a diluted basis with diluted earnings per share being the more dilutive of the treasury stock or two-class methods. OP Units are included in dilutive earnings per share calculations when the units are dilutive to earnings per share. For the three months ended March 31, 2018 and 2017, MAA's basic earnings per share is computed using the two-class method, and MAA's diluted earnings per share was computed using the more dilutive of the treasury stock method or two-class method, as presented below (dollars and shares in thousands, except per share amounts):
| Three months ended March 31,
| 2018 |  | 2017
Common Shares Outstanding |  |  |
Weighted average common shares - basic | 113,507 |  |  | 113,338 |
Weighted average partnership units outstanding | — |  | (1) | 4,219 |
Effect of dilutive securities | — |  | (2) | 307 |
Weighted average common shares - diluted | 113,507 |  |  | 117,864 |
Calculation of Earnings per Common Share - basic |  |  |
Net income | $ | 50,820 |  |  | $ | 43,416 |
Net income attributable to noncontrolling interests | (1,801 | ) |  | (1,511 | )
Unvested restricted stock (allocation of earnings) | (79 | ) |  | (73 | )
Preferred dividends | (922 | ) |  | (922 | )
Net income available for common shareholders, adjusted | $ | 48,018 |  |  | $ | 40,910 |
Weighted average common shares - basic | 113,507 |  |  | 113,338 |
Earnings per common share - basic | $ | 0.42 |  |  | $ | 0.36 |
Calculation of Earnings per Common Share - diluted |  |  |
Net income | $ | 50,820 |  |  | $ | 43,416 |
Net income attributable to noncontrolling interests | (1,801 | ) | (1) | — |
Unvested restricted stock (allocation of earnings) | (79 | ) | (2) | — |
Preferred dividends | (922 | ) |  | (922 | )
Net income available for common shareholders, adjusted | $ | 48,018 |  |  | $ | 42,494 |
Weighted average common shares - diluted | 113,507 |  |  | 117,864 |
Earnings per common share - diluted | $ | 0.42 |  |  | $ | 0.36 |
(1) For the three months ended March 31, 2018, 4.2 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive. (2) For the three months ended March 31, 2018, 0.2 million potentially dilutive securities and their related income are not included in the diluted earnings per share calculations as they are not dilutive.

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- Definition Earnings Per Common Share of MAA [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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