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Equity and Redeemable Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2010
Equity and Redeemable Noncontrolling Interests (Tables) [Abstract]  
Common shares and units rollforward
                         
    2010     2009     2008  
Common Shares
                       
Common Shares outstanding at January 1,
    279,959,048       272,786,760       269,554,661  
 
       
Common Shares Issued:
                       
Conversion of Series E Preferred Shares
    328,363       612       36,830  
Conversion of Series H Preferred Shares
    32,516       —       2,750  
Conversion of OP Units
    884,472       2,676,002       1,759,560  
Issuance of Common Shares
    6,151,198       3,497,300       —  
Exercise of share options
    2,506,645       422,713       995,129  
Employee Share Purchase Plan (ESPP)
    157,363       324,394       195,961  
Restricted share grants, net
    235,767       298,717       461,954  
 
                       
Common Shares Other:
                       
Repurchased and retired
    (58,130 )     (47,450 )     (220,085 )
 
                 
Common Shares outstanding at December 31,
    290,197,242       279,959,048       272,786,760  
 
                 
 
                       
Units
                       
Units outstanding at January 1,
    14,197,969       16,679,777       18,420,320  
LTIP Units, net
    92,892       154,616       —  
OP Units issued through acquisitions/consolidations
    205,648       32,061       19,017  
Conversion of Series B Junior Preference Units
    —       7,517       —  
Conversion of OP Units to Common Shares
    (884,472 )     (2,676,002 )     (1,759,560 )
 
                 
Units outstanding at December 31,
    13,612,037       14,197,969       16,679,777  
 
                 
Total Common Shares and Units outstanding at December 31,
    303,809,279       294,157,017       289,466,537  
 
                 
Units Ownership Interest in Operating Partnership
    4.5 %     4.8 %     5.8 %
 
                       
LTIP Units Issued:
                       
Issuance — per unit
    —     $ 0.50       —  
Issuance — contribution valuation
    —     $ 0.1 million     —  
 
                       
OP Units Issued:
                       
Acquisitions/consolidations — per unit
  $ 40.09     $ 26.50     $ 44.64  
Acquisitions/consolidations — valuation
  $ 8.2 million     $ 0.8 million     $ 0.8 million  
 
                       
Conversion of Series B Junior Preference Units — per unit
    —     $ 24.50       —  
Conversion of Series B Junior Preference Units — valuation
    —     $ 0.2 million       —  
Redeemable noncontrolling interests rollforward
                         
    2010     2009     2008  
Balance at January 1,
  $ 258,280     $ 264,394     $ 345,165  
Change in market value
    129,918       14,544       (65,524 )
Change in carrying value
    (4,658 )     (20,658 )     (15,247 )
 
                 
Balance at December 31,
  $ 383,540     $ 258,280     $ 264,394  
 
                 
Preferred shares schedule
                                         
                            Amounts in thousands  
                    Annual              
    Redemption     Conversion     Dividend per     December 31,     December 31,  
    Date (1) (2)     Rate (2)     Share (3)     2010     2009  
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized:
                                       
 
                                       
7.00% Series E Cumulative Convertible Preferred; liquidation value $25 per share; 0 and 328,466 shares issued and outstanding at December 31, 2010 and December 31, 2009, respectively
    11/1/98       1.1128     $ 1.75     $ —     $ 8,212  
 
                                       
7.00% Series H Cumulative Convertible Preferred; liquidation value $25 per share; 0 and 22,459 shares issued and outstanding at December 31, 2010 and December 31, 2009, respectively
    6/30/98       1.4480     $ 1.75       —       561  
 
                                       
8.29% Series K Cumulative Redeemable Preferred; liquidation value $50 per share; 1,000,000 shares issued and outstanding at December 31, 2010 and December 31, 2009
    12/10/26       N/A     $ 4.145       50,000       50,000  
 
                                       
6.48% Series N Cumulative Redeemable Preferred; liquidation value $250 per share; 600,000 shares issued and outstanding at December 31, 2010 and December 31, 2009 (4)
    6/19/08       N/A     $ 16.20       150,000       150,000  
 
                                   
 
                          $ 200,000     $ 208,773  
 
                                   
 
(1)   On or after the redemption date, redeemable preferred shares (Series K and N) may be redeemed for cash at the option of the Company, in whole or in part, at a redemption price equal to the liquidation price per share, plus accrued and unpaid distributions, if any.
 
(2)   On or after the redemption date, convertible preferred shares (Series E and H) may be redeemed under certain circumstances at the option of the Company for cash (in the case of Series E) or Common Shares (in the case of Series H), in whole or in part, at various redemption prices per share based upon the contractual conversion rate, plus accrued and unpaid distributions, if any. On November 1, 2010, the Company redeemed its Series E and Series H Cumulative Convertible Preferred Shares for cash consideration of $0.8 million and 355,539 Common Shares.
 
(3)   Dividends on all series of Preferred Shares are payable quarterly at various pay dates. The dividend listed for Series N is a Preferred Share rate and the equivalent Depositary Share annual dividend is $1.62 per share.
(4)   The Series N Preferred Shares have a corresponding depositary share that consists of ten times the number of shares and one-tenth the liquidation value and dividend per share.