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Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Summary on Revenues and Funds from Operations
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2010
 
2011
 
2010
Revenues
 
 
 
 
 
 
 
Rental Operations:
 
 
 
 
 
 
 
Office
$
111,376

 
$
124,397

 
$
340,483

 
$
371,206

Industrial
98,874

 
84,249

 
290,219

 
212,832

Non-reportable Rental Operations segments
20,334

 
16,495

 
59,698

 
49,453

General contractor and service fee revenue (“Service Operations”)
127,708

 
132,351

 
409,617

 
414,391

Total Segment Revenues
358,292

 
357,492

 
1,100,017

 
1,047,882

Other Revenue
2,971

 
3,158

 
8,219

 
8,998

Consolidated Revenue from continuing operations
361,263

 
360,650

 
1,108,236

 
1,056,880

Discontinued Operations
1,341

 
11,385

 
7,506

 
38,276

Consolidated Revenue
$
362,604

 
$
372,035

 
$
1,115,742

 
$
1,095,156

Reconciliation of Funds From Operations
 
 
 
 
 
 
 
Net earnings excluding depreciation and Non-Segment Items
 
 
 
 
 
 
 
Office
$
62,768

 
$
72,015

 
$
191,787

 
$
213,409

Industrial
72,006

 
62,716

 
208,925

 
158,395

Non-reportable Rental Operations segments
13,115

 
10,729

 
38,513

 
32,884

Service Operations
7,161

 
7,698

 
30,437

 
21,958

 
155,050

 
153,158

 
469,662

 
426,646

Non-Segment Items:
 
 
 
 
 
 
 
Interest expense
(66,875
)
 
(61,491
)
 
(199,269
)
 
(175,076
)
Impairment charges
—

 
(1,860
)
 
—

 
(9,834
)
Interest and other income
172

 
149

 
543

 
504

Other operating expenses
(60
)
 
(580
)
 
(171
)
 
(1,002
)
General and administrative expenses
(9,493
)
 
(8,476
)
 
(29,231
)
 
(31,171
)
Undeveloped land carrying costs
(2,259
)
 
(2,359
)
 
(7,021
)
 
(7,152
)
Loss on debt transactions
—

 
(167
)
 
—

 
(16,294
)
Acquisition-related activity
(342
)
 
57,513

 
(1,525
)
 
57,513

Income tax benefit
194

 
1,126

 
194

 
1,126

Other non-segment income
1,934

 
2,552

 
4,456

 
6,274

Net (income) loss attributable to noncontrolling interests
825

 
(993
)
 
532

 
562

Noncontrolling interest share of FFO adjustments
(2,835
)
 
(2,018
)
 
(6,206
)
 
(6,611
)
Joint venture items
11,635

 
7,916

 
30,597

 
32,488

Dividends on preferred shares
(14,399
)
 
(16,726
)
 
(46,347
)
 
(53,452
)
Adjustments for redemption/repurchase of preferred shares
(3,633
)
 
(5,652
)
 
(3,796
)
 
(10,144
)
Discontinued operations
390

 
3,801

 
1,648

 
13,170

FFO attributable to common shareholders
70,304

 
125,893

 
214,066

 
227,547

Depreciation and amortization on continuing operations
(96,909
)
 
(94,487
)
 
(290,751
)
 
(253,209
)
Depreciation and amortization on discontinued operations
(426
)
 
(3,426
)
 
(1,678
)
 
(10,877
)
Company’s share of joint venture adjustments
(8,531
)
 
(7,336
)
 
(24,798
)
 
(27,271
)
Earnings from depreciated property sales on continuing operations
(1,437
)
 
(125
)
 
66,910

 
6,917

Earnings from depreciated property sales on discontinued operations
2,088

 
11,527

 
16,405

 
24,383

Earnings from depreciated property sales—share of joint venture
—

 
—

 
91

 
2,308

Noncontrolling interest share of FFO adjustments
2,835

 
2,018

 
6,206

 
6,611

Net income (loss) attributable to common shareholders
$
(32,076
)
 
$
34,064

 
$
(13,549
)
 
$
(23,591
)
Reportable Segments Consolidated Assets
 
September 30,
2011
 
December 31,
2010
Assets
 
 
 
Rental Operations:
 
 
 
Office
$
2,759,739

 
$
3,122,565

Industrial
3,388,125

 
3,210,566

Non-reportable Rental Operations segments
640,885

 
627,491

Service Operations
175,839

 
231,662

Total Segment Assets
6,964,588

 
7,192,284

Non-Segment Assets
540,073

 
451,992

Consolidated Assets
$
7,504,661

 
$
7,644,276