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Activity for Real Estate Investments and Accumulated Depreciation
 12 Months Ended
Dec. 31, 2012
Real Estate and Accumulated Depreciation Disclosure [Abstract]  
Summary and rollforward of real estate investments and accumulated depreciation
Mid-America Apartments, L.P.
Schedule III
Real Estate and Accumulated Depreciation
A summary of activity for real estate investments and accumulated depreciation is as follows (dollars in thousands):

 
Year Ended December 31,
 
2012
 
2011
 
2010
Real estate investments:
 

 
 

 
 

Balance at beginning of year
$
3,057,999

 
$
2,670,832

 
$
2,433,526

Acquisitions (1)
344,869

 
334,650

 
284,486

Less:  FMV of Leases included in Acquisitions
(3,144
)
 
(3,522
)
 
(1,764
)
Improvement and development
111,354

 
80,993

 
45,544

Disposition of real estate assets (2)
(126,066
)
 
(24,954
)
 
(90,960
)
Balance at end of year
$
3,385,012

 
$
3,057,999

 
$
2,670,832

 
 
 
 
 
 
Accumulated depreciation:
 

 
 

 
 

Balance at beginning of year
$
858,276

 
$
769,066

 
$
675,679

Depreciation
113,110

 
102,713

 
94,138

Disposition of real estate assets (2)
(57,345
)
 
(13,503
)
 
(751
)
Balance at end of year
$
914,041

 
$
858,276

 
$
769,066

 
MAALP's consolidated balance sheet at December 31, 2012, 2011, and 2010, includes accumulated depreciation of $12,556,000, $11,105,000, and $9,967,000, respectively, in the caption "Commercial properties, net".

(1) Includes $32 million of non-cash activity related to fair market value of debt assumed.
(2) Includes assets sold, casualty losses, and removal of certain fully depreciated assets.