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Earnings Per Common Share of MAA (Tables)
 6 Months Ended
Jun. 30, 2017
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 for MAA common shareholders by the weighted average number of shares outstanding during the period.  All outstanding unvested restricted share awards contain rights to non-forfeitable dividends and participate in undistributed earnings with common 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 our 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 they are dilutive to earnings per share. For the three and six months ended June 30, 2017 and 2016, MAA's basic earnings per share was 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 June 30,
 
Six months ended June 30,
 
 
2017
 
2016
 
2017
 
2016
 
Shares Outstanding
 
 
 
 
 
 
 
 
Weighted average common shares - basic
113,403

 
75,277

 
113,371

 
75,263

 
Weighted average partnership units outstanding
—

(1) 
—

(1) 
—

(1) 
—

(1) 
Effect of dilutive securities
211

 
—

(2) 
279

 
239

 
Weighted average common shares - diluted
113,614

 
75,277

 
113,650

 
75,502

 
 
 
 
 
 
 
 
 
 
Calculation of Earnings per Share - basic
 
 
 
 
 

 
 

 
Net Income
$
50,155

 
$
47,630

 
$
93,571

 
$
93,438

 
Net Income attributable to noncontrolling interests
(1,840
)
 
(2,486
)
 
(3,351
)
 
(4,881
)
 
Unvested restricted stock (allocation of earnings)
(76
)
 
(134
)
 
(149
)
 
(237
)
 
Preferred dividends
(922
)
 
—

 
(1,844
)
 
—

 
Net income available for common shareholders, adjusted
$
47,317

 
$
45,010

 
$
88,227

 
$
88,320

 
 
 
 
 
 
 
 
 
 
Weighted average common shares - basic
113,403

 
75,277

 
113,371

 
75,263

 
Earnings per share - basic
$
0.42

 
$
0.60

 
$
0.78

 
$
1.17

 
 
 
 
 
 
 
 
 
 
Calculation of Earnings per Share - diluted
 
 
 
 
 

 
 

 
Net Income
$
50,155

 
$
47,630

 
$
93,571

 
$
93,438

 
Net income attributable to noncontrolling interests
(1,840
)
(1) 
(2,486
)
(1) 
(3,351
)
(1) 
(4,881
)
(1) 
Unvested restricted stock (allocation of earnings)
—

 
(134
)
(2) 
—

 
—

 
Preferred dividends
(922
)
 
—

 
(1,844
)
 
—

 
Net income available for common shareholders, adjusted
$
47,393

 
$
45,010

 
$
88,376

 
$
88,557

 
 
 
 
 
 
 
 
 
 
Weighted average common shares - diluted
113,614

 
75,277

 
113,650

 
75,502

 
Earnings per share - diluted
$
0.42

 
$
0.60

 
$
0.78

 
$
1.17

 

(1) For both the three and six months ended June 30, 2017 and June 30, 2016, 4.2 million OP Units and their related income are not included in the diluted earnings per share calculations as they are not dilutive.