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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
$
83,998

 
$
(83,426
)
 
$
(57,707
)
Allocation to Noncontrolling Interests – Operating Partnership, net
(3,072
)
 
4,505

 
3,969

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
66,229

 
(92,563
)
 
(67,668
)
Discontinued operations, net of Noncontrolling Interests
813,491

 
361,805

 
415,462

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
$
83,998

 
 
 
 
Net (income) attributable to Noncontrolling Interests – Partially Owned Properties
(832
)
 
 
 
 
Preferred distributions
(13,865
)
 
 
 
 
Income from continuing operations available to Common Shares
69,301

 
 
 
 
Discontinued operations, net
851,199

 
 
 
 
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
$
0.225

 
$
(0.327
)
 
$
(0.247
)
Discontinued operations, net of Noncontrolling Interests
2.759

 
1.279

 
1.518

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
$
0.222

 
$
(0.327
)
 
$
(0.247
)
Discontinued operations, net
2.728

 
1.279

 
1.518

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
$
83,998

 
$
(83,426
)
 
$
(57,707
)
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
69,301

 
(97,068
)
 
(71,637
)
Discontinued operations, net
851,199

 
379,409

 
439,736

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
$
0.225

 
$
(0.327
)
 
$
(0.247
)
Discontinued operations, net
2.759

 
1.279

 
1.518

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
$
0.222

 
$
(0.327
)
 
$
(0.247
)
Discontinued operations, net
2.728

 
1.279

 
1.518

Net income per Unit – diluted
$
2.950

 
$
0.952

 
$
1.271

Distributions declared per Unit outstanding
$
1.58

 
$
1.47

 
$
1.64