XML 28 R11.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Earnings Per OP Unit of MAALP | 6 Months Ended
--- | ---
Jun. 30, 2017
Earnings Per OP Unit of MAALP [Abstract] |
Earnings Per Unit [Text Block] | Earnings per OP Unit of MAALP Basic earnings per OP Unit is computed by dividing net income available for common unitholders by the weighted average number of OP Units outstanding during the period. All outstanding unvested restricted unit awards contain rights to non-forfeitable distributions and participate in undistributed earnings with common unitholders and, accordingly, are considered participating securities that are included in the two-class method of computing basic earnings per OP unit. Diluted earnings per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units. A reconciliation of the numerators and denominators of the basic and diluted earnings per OP Unit computations for the three and six months ended June 30, 2017 and 2016 is presented below:
(dollars and units in thousands, except per unit amounts) | Three months ended June 30, |  | Six months ended June 30, |
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Units Outstanding |  |  |  |  |  |  |  |
Weighted average common units - basic | 117,619 |  |  | 79,436 |  |  | 117,589 |  |  | 79,424 |  |
Effect of dilutive securities | 211 |  |  | — |  | (1) | 279 |  |  | 239 |  |
Weighted average common units - diluted | 117,830 |  |  | 79,436 |  |  | 117,868 |  |  | 79,663 |  |
Calculation of Earnings per Unit - basic |  |  |  |  |  |  |  |  |  |
Net Income | $ | 50,155 |  |  | $ | 47,630 |  |  | $ | 93,571 |  |  | $ | 93,438 |  |
Unvested restricted stock (allocation of earnings) | (76 | ) |  | (134 | ) |  | (149 | ) |  | (237 | ) |
Preferred unit distributions | (922 | ) |  | — |  |  | (1,844 | ) |  | — |  |
Net income available for common unitholders, adjusted | $ | 49,157 |  |  | $ | 47,496 |  |  | $ | 91,578 |  |  | $ | 93,201 |  |
Weighted average common units - basic | 117,619 |  |  | 79,436 |  |  | 117,589 |  |  | 79,424 |  |
Earnings per common unit - basic | $ | 0.42 |  |  | $ | 0.60 |  |  | $ | 0.78 |  |  | $ | 1.17 |  |
Calculation of Earnings per Unit - diluted |  |  |  |  |  |  |  |  |  |
Net Income | $ | 50,155 |  |  | $ | 47,630 |  |  | $ | 93,571 |  |  | $ | 93,438 |  |
Unvested restricted stock (allocation of earnings) | — |  |  | (134 | ) | (1) | — |  |  | — |  |
Preferred unit distributions | (922 | ) |  | — |  |  | (1,844 | ) |  | — |  |
Net income available for common unitholders, adjusted | $ | 49,233 |  |  | $ | 47,496 |  |  | $ | 91,727 |  |  | $ | 93,438 |  |
Weighted average common units - diluted | 117,830 |  |  | 79,436 |  |  | 117,868 |  |  | 79,663 |  |
Earnings per common unit - diluted | $ | 0.42 |  |  | $ | 0.60 |  |  | $ | 0.78 |  |  | $ | 1.17 |  |
(1) For the three months ended June 30, 2016, 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.

X
- Definition Earnings Per OP Unit of MAALP [Abstract] + References No definition available. + Details
Name: | maa_EarningsPerOPUnitofMAALPAbstract
Namespace Prefix: | maa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Earnings Per Unit [Text Block] + References No definition available. + Details
Name: | maa_EarningsPerUnitTextBlock
Namespace Prefix: | maa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration