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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Segment information
 
Pennsylvania
Suburbs
 
Philadelphia
CBD
 
Metropolitan, D.C.
 
New Jersey/Delaware
 
Richmond,
Virginia
 
Austin, Texas
 
California
 
Corporate
 
Total
2012:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Real estate investments, at cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating properties
$
1,178,730

 
$
988,590

 
$
1,193,200

 
$
546,644

 
$
309,923

 
$
285,346

 
$
223,736

 
$
—

 
$
4,726,169

Construction-in-progress
 
 
 
 
 
 
 
 
 
 
 
 
 
 
48,950

 
48,950

Land inventory
 
 
 
 
 
 
 
 
 
 
 
 
 
 
102,439

 
102,439

Total revenue
$
151,784

 
$
131,594

 
$
107,656

 
$
82,395

 
$
35,701

 
$
32,380

 
$
20,005

 
$
(1,682
)
 
$
559,833

Property operating expenses, real estate taxes and third party management expenses
53,392

 
50,790

 
41,487

 
37,968

 
14,485

 
13,952

 
10,050

 
(1,732
)
 
220,392

Net operating income
$
98,392

 
$
80,804

 
$
66,169

 
$
44,427

 
$
21,216

 
$
18,428

 
$
9,955

 
$
50

 
$
339,441

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
$
150,611

 
$
125,366

 
$
119,255

 
$
80,894

 
$
36,789

 
$
30,894

 
$
19,192

 
$
(1,248
)
 
$
561,753

Property operating expenses, real estate taxes and third party management expenses
55,558

 
48,832

 
45,136

 
40,218

 
14,739

 
13,058

 
10,483

 
(1,186
)
 
226,838

Net operating income
$
95,053

 
$
76,534

 
$
74,119

 
$
40,676

 
$
22,050

 
$
17,836

 
$
8,709

 
$
(62
)
 
$
334,915

2010:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
$
144,792

 
$
92,110

 
$
128,823

 
$
87,011

 
$
36,032

 
$
32,050

 
$
20,414

 
$
(800
)
 
$
540,432

Property operating expenses, real estate taxes and third party management expenses
59,537

 
37,890

 
46,104

 
43,780

 
14,008

 
13,399

 
10,827

 
(4,458
)
 
221,087

Net operating income
$
85,255

 
$
54,220

 
$
82,719

 
$
43,231

 
$
22,024

 
$
18,651

 
$
9,587

 
$
3,658

 
$
319,345
Reconciliation of consolidated net operating income
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(amounts in thousands)
Consolidated net operating income
$
339,441

 
$
334,915

 
$
319,345

Less:
 
 
 
 
 
Interest expense
(132,939
)
 
(131,405
)
 
(132,640
)
Deferred financing costs
(6,208
)
 
(4,991
)
 
(3,770
)
Depreciation and amortization
(195,841
)
 
(210,334
)
 
(203,345
)
Administrative expenses
(25,413
)
 
(24,602
)
 
(23,306
)
Plus:
 
 
 
 
 
Interest income
3,012

 
1,813

 
3,218

Historic tax credit transaction income
11,840

 
12,026

 
—

Recognized hedge activity
(2,985
)
 
—

 
—

Interest expense - financing obligation
(850
)
 
—

 
—

Equity in income of real estate ventures
2,741

 
3,775

 
5,305

Net gain (loss) on sales of interests in real estate
—

 
2,791

 
(22
)
Net gain on sale of undepreciated real estate
—

 
45

 
—

Loss on real estate venture formation
(950
)
 
(222
)
 
—

Loss on early extinguishment of debt
(22,002
)
 
(2,776
)
 
(2,110
)
Income (loss) from continuing operations
(30,154
)
 
(18,965
)
 
(37,325
)
Income from discontinued operations
36,683

 
14,250

 
19,719

Net income (loss)
$
6,529

 
$
(4,715
)
 
$
(17,606
)