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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
$
211,055

 
$
(24,826
)
 
$
(164,135
)
Allocation to Noncontrolling Interests – Operating Partnership, net
(8,685
)
 
1,749

 
8,250

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
186,019

 
(37,774
)
 
(169,527
)
Discontinued operations, net of Noncontrolling Interests
640,193

 
917,494

 
438,769

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
$
211,055

 

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

 
 
Preferred distributions
(10,355
)
 

 
 
Premium on redemption of Preferred Shares
(5,152
)
 

 
 
Income from continuing operations available to Common Shares
194,704

 

 
 
Discontinued operations, net
670,149

 

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

 
$
879,720

 
$
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

 

 
 
Long-term compensation shares/units
3,212

 

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

 
294,856

 
282,888

Net income per share – basic
$
2.73

 
$
2.98

 
$
0.95

Net income per share – diluted
$
2.70

 
$
2.98

 
$
0.95

Net income per share – basic:
 
 
 
 
 
Income (loss) from continuing operations available to Common Shares, net of
Noncontrolling Interests
$
0.614

 
$
(0.128
)
 
$
(0.599
)
Discontinued operations, net of Noncontrolling Interests
2.115

 
3.112

 
1.551

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
$
0.609

 
$
(0.128
)
 
$
(0.599
)
Discontinued operations, net
2.096

 
3.112

 
1.551

Net income per share – diluted
$
2.705

 
$
2.984

 
$
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 years ended December 31, 2011 and 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
$
211,055

 
$
(24,826
)
 
$
(164,135
)
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
194,704

 
(39,523
)
 
(177,777
)
Discontinued operations, net
670,149

 
960,023

 
460,118

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

 


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

 
308,062

 
296,527

Net income per Unit – basic
$
2.73

 
$
2.98

 
$
0.95

Net income per Unit – diluted
$
2.70

 
$
2.98

 
$
0.95

Net income per Unit – basic:
 

 
 

 
 

Income (loss) from continuing operations available to Units
$
0.614

 
$
(0.128
)
 
$
(0.599
)
Discontinued operations, net
2.115

 
3.112

 
1.551

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
$
0.609

 
$
(0.128
)
 
$
(0.599
)
Discontinued operations, net
2.096

 
3.112

 
1.551

Net income per Unit – diluted
$
2.705

 
$
2.984

 
$
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 years ended December 31, 2011 and 2010.