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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Line Items]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
 
Year Ended December 31,
 
2011
 
2010
 
2009
Numerator for net income per share – basic:
 

 
 

 
 

Income (loss) from continuing operations
$
76,443

 
$
(88,299
)
 
$
(63,220
)
Allocation to Noncontrolling Interests – Operating Partnership, net
(2,738
)
 
4,732

 
4,273

Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties
(832
)
 
726

 
558

Net income attributable to Preference Interests and Units
—

 
—

 
(9
)
Preferred distributions
(13,865
)
 
(14,368
)
 
(14,479
)
Income (loss) from continuing operations available to Common Shares, net of
  Noncontrolling Interests
59,008

 
(97,209
)
 
(72,877
)
Discontinued operations, net of Noncontrolling Interests
820,712

 
366,451

 
420,671

Numerator for net income per share – basic
$
879,720

 
$
269,242

 
$
347,794

Numerator for net income per share – diluted (1):
 
 
 
 
 
Income from continuing operations
$
76,443

 
 
 
 
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties
(832
)
 
 
 
 
Preferred distributions
(13,865
)
 
 
 
 
Income from continuing operations available to Common Shares
61,746

 
 
 
 
Discontinued operations, net
858,754

 
 
 
 
Numerator for net income per share – diluted (1)
$
920,500

 
$
269,242

 
$
347,794

Denominator for net income per share – basic and diluted (1):
 
 
 
 
 
Denominator for net income per share – basic
294,856

 
282,888

 
273,609

Effect of dilutive securities:
 
 
 
 
 
OP Units
13,206

 
 
 
 
Long-term compensation shares/units
4,003

 
 
 
 
Denominator for net income per share – diluted (1)
312,065

 
282,888

 
273,609

Net income per share – basic
$
2.98

 
$
0.95

 
$
1.27

Net income per share – diluted
$
2.95

 
$
0.95

 
$
1.27

Net income per share – basic:
 

 
 

 
 

Income (loss) from continuing operations available to Common Shares, net of
  Noncontrolling Interests
$
0.200

 
$
(0.344
)
 
$
(0.266
)
Discontinued operations, net of Noncontrolling Interests
2.784

 
1.296

 
1.537

Net income per share – basic
$
2.984

 
$
0.952

 
$
1.271

Net income per share – diluted (1):
 

 
 

 
 

Income (loss) from continuing operations available to Common Shares
$
0.198

 
$
(0.344
)
 
$
(0.266
)
Discontinued operations, net
2.752

 
1.296

 
1.537

Net income per share – diluted
$
2.950

 
$
0.952

 
$
1.271

Distributions declared per Common Share outstanding
$
1.58

 
$
1.47

 
$
1.64
Operating Partnership [Member]
  
Earnings Per Share [Line Items]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
 
Year Ended December 31,
 
2011
 
2010
 
2009
Numerator for net income per Unit – basic and diluted (1):
 

 
 

 
 

Income (loss) from continuing operations
$
76,443

 
$
(88,299
)
 
$
(63,220
)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties
(832
)
 
726

 
558

Allocation to Preference Units
(13,865
)
 
(14,368
)
 
(14,479
)
Allocation to Preference Interests and Junior Preference Units
—

 
—

 
(9
)
Income (loss) from continuing operations available to Units
61,746

 
(101,941
)
 
(77,150
)
Discontinued operations, net
858,754

 
384,282

 
445,249

Numerator for net income per Unit – basic and diluted (1)
$
920,500

 
$
282,341

 
$
368,099

Denominator for net income per Unit – basic and diluted (1):
 
 
 
 
 
Denominator for net income per Unit – basic
308,062

 
296,527

 
289,167

Effect of dilutive securities:
 
 
 
 
 
Dilution for Units issuable upon assumed exercise/vesting of the Company's
    long-term compensation shares/units
4,003

 
 
 
 
Denominator for net income per Unit – diluted (1)
312,065

 
296,527

 
289,167

Net income per Unit – basic
$
2.98

 
$
0.95

 
$
1.27

Net income per Unit – diluted
$
2.95

 
$
0.95

 
$
1.27

Net income per Unit – basic:
 

 
 

 
 

Income (loss) from continuing operations available to Units
$
0.200

 
$
(0.344
)
 
$
(0.266
)
Discontinued operations, net
2.784

 
1.296

 
1.537

Net income per Unit – basic
$
2.984

 
$
0.952

 
$
1.271

Net income per Unit – diluted (1):
 

 
 

 
 

Income (loss) from continuing operations available to Units
$
0.198

 
$
(0.344
)
 
$
(0.266
)
Discontinued operations, net
2.752

 
1.296

 
1.537

Net income per Unit – diluted
$
2.950

 
$
0.952

 
$
1.271

Distributions declared per Unit outstanding
$
1.58

 
$
1.47

 
$
1.64