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Reportable Segments (Tables)
 12 Months Ended
Dec. 31, 2012
Reportable Segments (Tables) [Abstracts]  
Reportable Segments Schedule
 
Year Ended December 31, 2012
 
Northeast
 
Northwest
 
Southeast
 
Southwest
 
Other (3)
 
Total
Rental income:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
$
708,009

 
$
386,813

 
$
332,185

 
$
441,911

 
$
—

 
$
1,868,918

Non-same store/other (2) (3)
110,060

 
54,414

 
19,853

 
60,962

 
(65
)
 
245,224

Total rental income
818,069

 
441,227

 
352,038

 
502,873

 
(65
)
 
2,114,142

Operating expenses:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
251,538

 
127,213

 
127,279

 
143,884

 
—

 
649,914

Non-same store/other (2) (3)
33,423

 
24,755

 
7,550

 
20,837

 
3,285

 
89,850

Total operating expenses
284,961

 
151,968

 
134,829

 
164,721

 
3,285

 
739,764

NOI:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
456,471

 
259,600

 
204,906

 
298,027

 
—

 
1,219,004

Non-same store/other (2) (3)
76,637

 
29,659

 
12,303

 
40,125

 
(3,350
)
 
155,374

Total NOI
$
533,108

 
$
289,259

 
$
217,209

 
$
338,152

 
$
(3,350
)
 
$
1,374,378

 
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
6,972,992

 
$
2,953,700

 
$
2,268,805

 
$
3,191,403

 
$
1,814,100

 
$
17,201,000

 
 
 
 
 
 
 
 
 
 
 
 
Capital expenditures
$
58,298

 
$
35,650

 
$
27,521

 
$
28,505

 
$
2,854

 
$
152,828


(1)
Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2011, less properties subsequently sold, which represented 98,577 apartment units.
(2)
Non-same store primarily includes properties acquired after January 1, 2011, plus any properties in lease-up and not stabilized as of January 1, 2011.
(3)
Other includes development and other corporate operations.

 
Year Ended December 31, 2011
 
Northeast
 
Northwest
 
Southeast
 
Southwest
 
Other (3)
 
Total
Rental income:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
$
671,633

 
$
356,822

 
$
317,205

 
$
425,789

 
$
—

 
$
1,771,449

Non-same store/other (2) (3)
51,566

 
9,900

 
14,488

 
30,539

 
(3,477
)
 
103,016

Total rental income
723,199

 
366,722

 
331,693

 
456,328

 
(3,477
)
 
1,874,465

Operating expenses:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
245,166

 
125,008

 
123,720

 
144,777

 
—

 
638,671

Non-same store/other (2) (3)
14,101

 
3,946

 
5,165

 
12,144

 
7,326

 
42,682

Total operating expenses
259,267

 
128,954

 
128,885

 
156,921

 
7,326

 
681,353

NOI:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
426,467

 
231,814

 
193,485

 
281,012

 
—

 
1,132,778

Non-same store/other (2) (3)
37,465

 
5,954

 
9,323

 
18,395

 
(10,803
)
 
60,334

Total NOI
$
463,932

 
$
237,768

 
$
202,808

 
$
299,407

 
$
(10,803
)
 
$
1,193,112

 
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
6,550,979

 
$
2,816,078

 
$
2,340,902

 
$
3,238,164

 
$
1,713,180

 
$
16,659,303

 
 
 
 
 
 
 
 
 
 
 
 
Capital expenditures
$
51,203

 
$
32,522

 
$
24,813

 
$
27,792

 
$
8,122

 
$
144,452


(1)
Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2011, less properties subsequently sold, which represented 98,577 apartment units.
(2)
Non-same store primarily includes properties acquired after January 1, 2011, plus any properties in lease-up and not stabilized as of January 1, 2011.
(3)
Other includes development, condominium conversion overhead of $0.4 million and other corporate operations.
 
Year Ended December 31, 2010
 
Northeast
 
Northwest
 
Southeast
 
Southwest
 
Other (3)
 
Total
Rental income:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
$
553,561

 
$
322,427

 
$
342,080

 
$
412,414

 
$
—

 
$
1,630,482

Non-same store/other (2) (3)
95,493

 
18,825

 
9,009

 
13,587

 
(3,604
)
 
133,310

Properties sold in 2012 (4)
—

 
—

 
—

 
—

 
(98,559
)
 
(98,559
)
Total rental income
649,054

 
341,252

 
351,089

 
426,001

 
(102,163
)
 
1,665,233

Operating expenses:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
207,131

 
119,797

 
139,550

 
147,732

 
—

 
614,210

Non-same store/other (2) (3)
48,119

 
8,300

 
3,729

 
7,198

 
12,230

 
79,576

Properties sold in 2012 (4)
—

 
—

 
—

 
—

 
(39,015
)
 
(39,015
)
Total operating expenses
255,250

 
128,097

 
143,279

 
154,930

 
(26,785
)
 
654,771

NOI:
 

 
 

 
 

 
 

 
 

 
 

Same store (1)
346,430

 
202,630

 
202,530

 
264,682

 
—

 
1,016,272

Non-same store/other (2) (3)
47,374

 
10,525

 
5,280

 
6,389

 
(15,834
)
 
53,734

Properties sold in 2012 (4)
—

 
—

 
—

 
—

 
(59,544
)
 
(59,544
)
Total NOI
$
393,804

 
$
213,155

 
$
207,810

 
$
271,071

 
$
(75,378
)
 
$
1,010,462


(1)
Same store primarily includes all properties acquired or completed and stabilized prior to January 1, 2010, less properties subsequently sold, which represented 101,312 apartment units.
(2)
Non-same store primarily includes properties acquired after January 1, 2010, plus any properties in lease-up and not stabilized as of January 1, 2010.
(3)
Other includes development, condominium conversion overhead of $0.6 million and other corporate operations.
(4)
Reflects discontinued operations for properties sold during 2012.
Reconciliation of NOI
 
Year Ended December 31,
 
2012
 
2011
 
2010
Rental income
$
2,114,142

 
$
1,874,465

 
$
1,665,233

Property and maintenance expense
(415,986
)
 
(387,968
)
 
(374,135
)
Real estate taxes and insurance expense
(241,876
)
 
(211,518
)
 
(200,779
)
Property management expense
(81,902
)
 
(81,867
)
 
(79,857
)
Total operating expenses
(739,764
)
 
(681,353
)
 
(654,771
)
Net operating income
$
1,374,378

 
$
1,193,112

 
$
1,010,462