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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Line Items]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
 
Year Ended December 31,
 
2012
 
2011
 
2010
Numerator for net income per share – basic:
 

 
 

 
 

Income (loss) from continuing operations
$
311,555

 
$
57,794

 
$
(103,108
)
Allocation to Noncontrolling Interests – Operating Partnership, net
(13,178
)
 
(1,912
)
 
5,419

Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties
(844
)
 
(832
)
 
726

Preferred distributions
(10,355
)
 
(13,865
)
 
(14,368
)
Premium on redemption of Preferred Shares
(5,152
)
 
—

 
—

Income (loss) from continuing operations available to Common Shares, net of
  Noncontrolling Interests
282,026

 
41,185

 
(111,331
)
Discontinued operations, net of Noncontrolling Interests
544,186

 
838,535

 
380,573

Numerator for net income per share – basic
$
826,212

 
$
879,720

 
$
269,242

Numerator for net income per share – diluted (1):
 
 
 
 
 
Income from continuing operations
$
311,555

 
$
57,794

 
 
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties
(844
)
 
(832
)
 
 
Preferred distributions
(10,355
)
 
(13,865
)
 
 
Premium on redemption of Preferred Shares
(5,152
)
 
—

 
 
Income from continuing operations available to Common Shares
295,204

 
43,097

 
 
Discontinued operations, net
569,649

 
877,403

 
 
Numerator for net income per share – diluted (1)
$
864,853

 
$
920,500

 
$
269,242

Denominator for net income per share – basic and diluted (1):
 
 
 
 
 
Denominator for net income per share – basic
302,701

 
294,856

 
282,888

Effect of dilutive securities:
 
 
 
 
 
OP Units
13,853

 
13,206

 
 
Long-term compensation shares/units
3,212

 
4,003

 
 
Denominator for net income per share – diluted (1)
319,766

 
312,065

 
282,888

Net income per share – basic
$
2.73

 
$
2.98

 
$
0.95

Net income per share – diluted
$
2.70

 
$
2.95

 
$
0.95

Net income per share – basic:
 

 
 

 
 

Income (loss) from continuing operations available to Common Shares, net of
  Noncontrolling Interests
$
0.932

 
$
0.140

 
$
(0.393
)
Discontinued operations, net of Noncontrolling Interests
1.797

 
2.844

 
1.345

Net income per share – basic
$
2.729

 
$
2.984

 
$
0.952

Net income per share – diluted (1):
 

 
 

 
 

Income (loss) from continuing operations available to Common Shares
$
0.923

 
$
0.138

 
$
(0.393
)
Discontinued operations, net
1.782

 
2.812

 
1.345

Net income per share – diluted
$
2.705

 
$
2.950

 
$
0.952

Distributions declared per Common Share outstanding
$
1.78

 
$
1.58

 
$
1.47



(1)
Potential common shares issuable from the assumed conversion of OP Units and the exercise/vesting of long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per share calculation as the Company had a loss from continuing operations for the year ended December 31, 2010.
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,
 
2012
 
2011
 
2010
Numerator for net income per Unit – basic and diluted (1):
 

 
 

 
 

Income (loss) from continuing operations
$
311,555

 
$
57,794

 
$
(103,108
)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties
(844
)
 
(832
)
 
726

Allocation to Preference Units
(10,355
)
 
(13,865
)
 
(14,368
)
Allocation to premium on redemption of Preference Units
(5,152
)
 
—

 
—

Income (loss) from continuing operations available to Units
295,204

 
43,097

 
(116,750
)
Discontinued operations, net
569,649

 
877,403

 
399,091

Numerator for net income per Unit – basic and diluted (1)
$
864,853

 
$
920,500

 
$
282,341

Denominator for net income per Unit – basic and diluted (1):
 
 
 
 
 
Denominator for net income per Unit – basic
316,554

 
308,062

 
296,527

Effect of dilutive securities:
 
 
 
 
 
Dilution for Units issuable upon assumed exercise/vesting of the Company's
    long-term compensation shares/units
3,212

 
4,003

 
 
Denominator for net income per Unit – diluted (1)
319,766

 
312,065

 
296,527

Net income per Unit – basic
$
2.73

 
$
2.98

 
$
0.95

Net income per Unit – diluted
$
2.70

 
$
2.95

 
$
0.95

Net income per Unit – basic:
 

 
 

 
 

Income (loss) from continuing operations available to Units
$
0.932

 
$
0.140

 
$
(0.393
)
Discontinued operations, net
1.797

 
2.844

 
1.345

Net income per Unit – basic
$
2.729

 
$
2.984

 
$
0.952

Net income per Unit – diluted (1):
 

 
 

 
 

Income (loss) from continuing operations available to Units
$
0.923

 
$
0.138

 
$
(0.393
)
Discontinued operations, net
1.782

 
2.812

 
1.345

Net income per Unit – diluted
$
2.705

 
$
2.950

 
$
0.952

Distributions declared per Unit outstanding
$
1.78

 
$
1.58

 
$
1.47



(1)
Potential Units issuable from the assumed exercise/vesting of the Company's long-term compensation shares/units are automatically anti-dilutive and therefore excluded from the diluted earnings per Unit calculation as the Operating Partnership had a loss from continuing operations for the year ended December 31, 2010.