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Earnings Per Share and Earnings Per Unit (Tables)
 6 Months Ended
Jun. 30, 2011
Earnings Per Share and Earnings Per Unit [Abstract]  
Computation of net income per share - basic and net income per share - diluted
                                 
    Six Months Ended June 30,     Quarter Ended June 30,  
    2011     2010     2011     2010  
Numerator for net income per share — basic:
                               
Income (loss) from continuing operations
  $ 16,495     $ (29,153 )   $ 21,195     $ (9,945 )
Allocation to Noncontrolling Interests — Operating Partnership, net
    (457 )     1,725       (814 )     628  
Net (income) loss attributable to Noncontrolling Interests — Partially Owned Properties
    (31 )     435       (71 )     185  
Preferred distributions
    (6,933 )     (7,238 )     (3,467 )     (3,618 )
 
                       
 
                               
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests
    9,074       (34,231 )     16,843       (12,750 )
Discontinued operations, net of Noncontrolling Interests
    667,248       92,437       535,614       19,093  
 
                       
 
                               
Numerator for net income per share — basic
  $ 676,322     $ 58,206     $ 552,457     $ 6,343  
 
                       
 
                               
Numerator for net income per share — diluted (1):
                               
Income from continuing operations
  $ 16,495             $ 21,195          
Net (income) attributable to Noncontrolling Interests — Partially Owned Properties
    (31 )             (71 )        
Preferred distributions
    (6,933 )             (3,467 )        
 
                           
 
                               
Income from continuing operations available to Common Shares
    9,531               17,657          
Discontinued operations, net
    698,324               560,558          
 
                           
 
                               
Numerator for net income per share — diluted (1)
  $ 707,855     $ 58,206     $ 578,215     $ 6,343  
 
                       
 
                               
Denominator for net income per share — basic and diluted (1):
                               
Denominator for net income per share — basic
    293,784       281,435       294,663       282,217  
Effect of dilutive securities:
                               
OP Units
    13,322               13,291          
Long-term compensation shares/units
    4,274               4,245          
 
                           
 
                               
Denominator for net income per share — diluted (1)
    311,380       281,435       312,199       282,217  
 
                       
 
                               
Net income per share — basic
  $ 2.30     $ 0.21     $ 1.88     $ 0.02  
 
                       
 
                               
Net income per share — diluted
  $ 2.27     $ 0.21     $ 1.85     $ 0.02  
 
                       
 
                               
Net income per share — basic:
                               
Income (loss) from continuing operations available to Common Shares, net of Noncontrolling Interests
  $ 0.031     $ (0.121 )   $ 0.057     $ (0.045 )
Discontinued operations, net of Noncontrolling Interests
    2.271       0.328       1.818       0.067  
 
                       
 
                               
Net income per share — basic
  $ 2.302     $ 0.207     $ 1.875     $ 0.022  
 
                       
 
                               
Net income per share — diluted (1):
                               
Income (loss) from continuing operations available to Common Shares
  $ 0.031     $ (0.121 )   $ 0.057     $ (0.045 )
Discontinued operations, net
    2.242       0.328       1.795       0.067  
 
                       
 
                               
Net income per share — diluted
  $ 2.273     $ 0.207     $ 1.852     $ 0.022  
 
                       
 
(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 six months and quarter ended June 30, 2010.
Computation of net income per Unit - basic and net income per Unit - diluted
                                 
    Six Months Ended June 30,     Quarter Ended June 30,  
    2011     2010     2011     2010  
Numerator for net income per Unit — basic and diluted (1):
                               
Income (loss) from continuing operations
  $ 16,495     $ (29,153 )   $ 21,195     $ (9,945 )
Net (income) loss attributable to Noncontrolling Interests — Partially Owned Properties
    (31 )     435       (71 )     185  
Allocation to Preference Units
    (6,933 )     (7,238 )     (3,467 )     (3,618 )
 
                       
 
                               
Income (loss) from continuing operations available to Units
    9,531       (35,956 )     17,657       (13,378 )
Discontinued operations, net
    698,324       97,098       560,558       20,034  
 
                       
 
                               
Numerator for net income per Unit — basic and diluted (1)
  $ 707,855     $ 61,142     $ 578,215     $ 6,656  
 
                       
 
                               
Denominator for net income per Unit — basic and diluted (1):
                               
Denominator for net income per Unit — basic
    307,106       295,177       307,954       295,898  
Effect of dilutive securities:
                               
Dilution for Units issuable upon assumed exercise/vesting of the Company’s long-term compensation shares/units
    4,274               4,245          
 
                           
 
                               
Denominator for net income per Unit — diluted (1)
    311,380       295,177       312,199       295,898  
 
                       
 
                               
Net income per Unit — basic
  $ 2.30     $ 0.21     $ 1.88     $ 0.02  
 
                       
 
                               
Net income per Unit — diluted
  $ 2.27     $ 0.21     $ 1.85     $ 0.02  
 
                       
 
                               
Net income per Unit — basic:
                               
Income (loss) from continuing operations available to Units
  $ 0.031     $ (0.121 )   $ 0.057     $ (0.045 )
Discontinued operations, net
    2.271       0.328       1.818       0.067  
 
                       
 
                               
Net income per Unit — basic
  $ 2.302     $ 0.207     $ 1.875     $ 0.022  
 
                       
 
                               
Net income per Unit — diluted (1):
                               
Income (loss) from continuing operations available to Units
  $ 0.031     $ (0.121 )   $ 0.057     $ (0.045 )
Discontinued operations, net
    2.242       0.328       1.795       0.067  
 
                       
 
                               
Net income per Unit — diluted
  $ 2.273     $ 0.207     $ 1.852     $ 0.022  
 
                       
 
                               
 
(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 six months and quarter ended June 30, 2010.