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MAALP Capital (Tables)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
MAALP Capital [Abstract]    
Partners' Capital [Table Text Block]
Total capital and its components for the nine-month periods ended September 30, 2015 and 2014 were as follows (dollars in thousands, except per unit data):

  
Mid-America Apartments, L.P. Unitholders
 
 
 
Limited Partner
 
General Partner
 
Accumulated
Other
Comprehensive
Income (Loss)
 
Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2014
$
161,310

 
$
2,890,858

 
$
(376
)
 
$
3,051,792

Net income
16,078

 
289,300

 
 
 
305,378

Other comprehensive loss - derivative instruments (cash flow hedges)
 
 
 
 
(6,222
)
 
(6,222
)
Issuance of units
 
 
326

 
 
 
326

Units repurchased and retired
 
 
(957
)
 
 
 
(957
)
Exercise of unit options
 
 
420

 
 
 
420

General partner units issued in exchange for limited partner units
(236
)
 
236

 
 
 
—

Redeemable units fair market value adjustment
 
 
(614
)
 
 
 
(614
)
Adjustment for limited partners' capital at redemption value
58

 
(58
)
 
 
 
—

Amortization of unearned compensation
 
 
4,950

 
 
 
4,950

Distributions ($2.31 per unit)
(9,671
)
 
(174,100
)
 
 
 
(183,771
)
CAPITAL BALANCE SEPTEMBER 30, 2015
$
167,539

 
$
3,010,361

 
$
(6,598
)
 
$
3,171,302
  
Mid-America Apartments, L.P. Unitholders
 
 
 
Limited Partner
 
General Partner
 
Accumulated
Other
Comprehensive
Income (Loss)
 
Total Partnership Capital
CAPITAL BALANCE DECEMBER 31, 2013
$
166,746

 
$
2,946,598

 
$
174

 
$
3,113,518

Net income
6,364

 
113,455

 
 
 
119,819

Other comprehensive income - derivative instruments (cash flow hedges)
 
 
 
 
303

 
303

Issuance of units
 
 
728

 
 
 
728

Units repurchased and retired
 
 
(456
)
 
 
 
(456
)
Exercise of unit options
 
 
11,916

 
 
 
11,916

General partner units issued in exchange for limited partner units
(992
)
 
992

 
 
 
—

Units issued in exchange for redeemable units
 
 
998

 
 
 
998

Redeemable units fair market value adjustment
 
 
(286
)
 
 
 
(286
)
Adjustment for limited partners capital at redemption value
28

 
(28
)
 
 
 
—

Amortization of unearned compensation
 
 
3,180

 
 
 
3,180

Distributions ($2.19 per unit)
(9,209
)
 
(164,598
)
 
 
 
(173,807
)
CAPITAL BALANCE SEPTEMBER 30, 2014
$
162,937

 
$
2,912,499

 
$
477

 
$
3,075,913