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Condensed Consolidated Statements Of Equity And Perpetual Preferred Units (USD $)
Total
Common Shares Of Beneficial Interest
Additional Paid-In Capital
Distributions In Excess Of Net Income
Treasury Shares, At Cost
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Perpetual Preferred Units
Beginning Balance at Dec. 31, 2010 $ 1,757,373,000 $ 824,000 $ 2,775,625,000 $ (595,317,000) $ (461,255,000) $ (33,458,000) $ 70,954,000  
Perpetual Preferred Units, Beginning Balance at Dec. 31, 2010               97,925,000
Net income 4,647,000     2,529,000     2,118,000 5,250,000
Other comprehensive income 33,659,000         33,659,000    
Common shares issued 69,863,000 11,000 69,852,000          
Net share awards 10,304,000 4,000 9,597,000   703,000      
Employee stock purchase plan 1,817,000   482,000   1,335,000      
Common share options exercised 11,964,000 1,000 4,990,000   6,973,000      
Conversions of operating partnership units   1,000 591,000       (592,000)  
Cash distributions declared to perpetual preferred units               (5,250,000)
Cash distributions declared to equity holders (111,778,000)     (108,109,000)     (3,669,000)  
Redemption of perpetual preferred units 0              
Other   (2,000) 2,000          
Ending Balance at Sep. 30, 2011 1,777,849,000 839,000 2,861,139,000 (700,897,000) (452,244,000) 201,000 68,811,000  
Perpetual Preferred Units, Ending Balance at Sep. 30, 2011               97,925,000
Beginning Balance at Dec. 31, 2011 1,827,768,000 845,000 2,901,024,000 (690,466,000) (452,003,000) (683,000) 69,051,000  
Perpetual Preferred Units, Beginning Balance at Dec. 31, 2011               97,925,000
Net income 144,903,000     141,224,000     3,679,000 2,851,000
Other comprehensive income 23,000         23,000    
Common shares issued 693,375,000 112,000 693,263,000          
Net share awards 11,619,000   (2,477,000)   14,096,000      
Employee stock purchase plan 1,331,000   613,000   718,000      
Common share options exercised 13,273,000   1,840,000   11,433,000      
Conversions of operating partnership units    2,000 (450,000)       448,000  
Cash distributions declared to perpetual preferred units               (776,000)
Cash distributions declared to equity holders (148,943,000)     (142,993,000)     (5,950,000)  
Redemption of perpetual preferred units 100,000,000             (100,000,000)
Purchase of noncontrolling interests (10,241,000)   (13,285,000)       3,044,000  
Ending Balance at Sep. 30, 2012 2,533,108,000 959,000 3,580,528,000 (692,235,000) (425,756,000) (660,000) 70,272,000  
Perpetual Preferred Units, Ending Balance at Sep. 30, 2012               $ 0