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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2011
Segment Reporting [Abstract]  
Segment information

 
Pennsylvania
Suburbs
 
Philadelphia
CBD
 
Metropolitan,
D.C.
 
New Jersey
/Delaware
 
Richmond,
Virginia
 
Austin, Texas
 
California
 
Corporate
 
Total
2011:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate investments, at cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating properties
$
1,218,071

 
$
953,870

 
$
1,255,803

 
$
545,657

 
$
307,698

 
$
257,694

 
$
254,287

 
$
—

 
$
4,793,080

Construction-in-progress
 
 
 
 
 
 
 
 
 
 
 
 
 
 
25,083

 
$
25,083

Land inventory
 
 
 
 
 
 
 
 
 
 
 
 
 
 
109,008

 
$
109,008

Total revenue
158,248

 
125,366

 
128,456

 
81,629

 
36,789

 
30,895

 
21,670

 
(1,248
)
 
581,805

Property operating expenses, real estate taxes and third party management expenses
58,440

 
48,792

 
47,786

 
40,500

 
14,727

 
13,048

 
11,507

 
(989
)
 
233,811

Net operating income
$
99,808

 
$
76,574

 
$
80,670

 
$
41,129

 
$
22,062

 
$
17,847

 
$
10,163

 
$
(259
)
 
$
347,994

2010:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate investments, at cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating properties
$
1,199,957

 
$
911,354

 
$
1,359,776

 
$
568,413

 
$
294,406

 
$
254,019

 
$
246,186

 
$
—

 
$
4,834,111

Construction-in-progress
—

 
—

 
—

 
—

 
—

 
—

 
—

 
33,322

 
33,322

Land inventory
—

 
—

 
—

 
—

 
—

 
—

 
—

 
110,055

 
110,055

Total revenue
152,380

 
92,110

 
137,923

 
87,711

 
36,032

 
32,049

 
22,551

 
(800
)
 
559,956

Property operating expenses, real estate taxes and third party management expenses
59,065

 
37,896

 
48,318

 
44,137

 
14,010

 
13,401

 
11,852

 
(1,338
)
 
227,341

Net operating income
$
93,315

 
$
54,214

 
$
89,605

 
$
43,574

 
$
22,022

 
$
18,648

 
$
10,699

 
$
538

 
$
332,615

2009:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate investments, at cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating properties
$
1,219,391

 
$
490,602

 
$
1,372,213

 
$
605,181

 
$
301,474

 
$
268,806

 
$
254,951

 
$
—

 
$
4,512,618

Construction-in-progress
—

 
 
 
—

 
—

 
—

 
—

 
—

 
271,962

 
271,962

Land inventory
—

 
 
 
—

 
—

 
—

 
—

 
—

 
97,368

 
97,368

Total revenue
157,616

 
73,534

 
140,438

 
98,344

 
36,201

 
31,311

 
29,283

 
1,193

 
567,920

Property operating expenses, real estate taxes and third party management expenses
56,297

 
31,479

 
52,899

 
45,421

 
13,871

 
14,351

 
14,735

 
(1,893
)
 
227,160

Net operating income
$
101,319

 
$
42,055

 
$
87,539

 
$
52,923

 
$
22,330

 
$
16,960

 
$
14,548

 
$
3,086

 
$
340,760
Reconciliation of consolidated net operating income
 
Year Ended December 31,
 
2011
 
2010
 
2009
 
(amounts in thousands)
Consolidated net operating income
$
347,994

 
$
332,615

 
$
340,760

Less:
 
 
 
 
 
Interest expense
(131,405
)
 
(132,640
)
 
(135,740
)
Deferred financing costs
(4,991
)
 
(3,770
)
 
(5,864
)
Depreciation and amortization
(217,680
)
 
(210,592
)
 
(203,572
)
Administrative expenses
(24,602
)
 
(23,306
)
 
(20,821
)
Recognized Hedge Activity
—

 
—

 
(916
)
Plus:
 
 
 
 
 
Interest income
1,813

 
3,222

 
2,499

Historic tax credit transaction income
12,026

 
—

 
—

Equity in income of real estate ventures
3,775

 
5,305

 
4,069

Net gain on sales of interests in real estate ventures
2,791

 
—

 
(3
)
Net gain on sale of undepreciated real estate
45

 
—

 
—

Loss on real estate venture formation
(222
)
 
—

 
—

Gain (loss) on early extinguishment of debt
(2,776
)
 
(2,110
)
 
23,176

Income (loss) from continuing operations
(13,232
)
 
(31,276
)
 
3,588

Income from discontinued operations
8,517

 
13,670

 
4,501

Net income (loss)
$
(4,715
)
 
$
(17,606
)
 
$
8,089