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Earnings Per OP Unit of MAALP (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Unit [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Unit [Table Text Block]
A reconciliation of the numerators and denominators of the basic and diluted earnings per OP Unit computations for the years ended December 31, 2017, 2016, and 2015 is presented below (dollars and units in thousands, except per unit amounts):
 
2017
 
2016
 
2015
 
Common Units Outstanding
 
 
 
 
 
 
Weighted average common units - basic
117,617

 
82,661

 
79,361

 
Effect of dilutive securities
280

 
298

 
—

(1) 
Weighted average common units - diluted
117,897

 
82,959

 
79,361

 
 
 
 
 
 
 
 
Calculation of Earnings per Common Unit - basic
 

 
 

 
 

 
Net income
$
340,536

 
$
224,402

 
$
350,745

 
Unvested restricted stock (allocation of earnings)
(535
)
 
(574
)
 
(772
)
 
Preferred unit distributions
(3,688
)
 
(307
)
 
—

 
Net income available for common unitholders, adjusted
$
336,313

 
$
223,521

 
$
349,973

 
 
 
 
 
 
 
 
Weighted average common units - basic
117,617

 
82,661

 
79,361

 
Earnings per common unit - basic:
$
2.86

 
$
2.70

 
$
4.41

 
 
 
 
 
 
 
 
Calculation of Earnings per Common Unit - diluted
 

 
 

 
 

 
Net income
$
340,536

 
$
224,402

 
$
350,745

 
Unvested restricted stock (allocation of earnings)
—

 
—

 
(772
)
(1) 
Preferred unit distributions
(3,688
)
 
(307
)
 
—

 
Net income available for common unitholders, adjusted
$
336,848

 
$
224,095

 
$
349,973

 
 
 
 
 
 
 
 
Weighted average common units - diluted
117,897

 
82,959

 
79,361

 
Earnings per common unit - diluted:
$
2.86

 
$
2.70

 
$
4.41

 

(1) For the year ended December 31, 2015, 0.1 million potentially dilutive securities and their related income are not included in the diluted earnings per unit calculations as they are not dilutive.