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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 Loss
Non-controlling Interests
Perpetual Preferred Units
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 113,100,000     110,521,000     2,579,000 2,851,000
Other comprehensive income 16,000         16,000    
Common shares issued 604,459,000 99,000 604,360,000          
Net share awards 7,839,000   (6,182,000)   14,021,000      
Employee stock purchase plan 464,000   294,000   170,000      
Common share options exercised 9,161,000   2,307,000   6,854,000      
Conversions of operating partnership units 0 2,000 (450,000)       448,000  
Cash distributions declared to perpetual preferred units               (776,000)
Cash distributions declared to equity holders (97,899,000)     (94,276,000)     (3,623,000)  
Redemption of perpetual preferred units (100,000,000)             (100,000,000)
Other 0 (1,000) 1,000          
Ending Balance at Jun. 30, 2012 2,464,908,000 945,000 3,501,354,000 (674,221,000) (430,958,000) (667,000) 68,455,000  
Perpetual Preferred Units, Ending Balance at Jun. 30, 2012               0
Beginning Balance at Dec. 31, 2012 2,626,708,000 962,000 3,587,505,000 (598,951,000) (425,355,000) (1,062,000) 63,609,000  
Net income 139,370,000     135,648,000     3,722,000  
Other comprehensive income 27,000         27,000    
Common shares issued 40,182,000 6,000 40,176,000          
Net share awards 9,232,000 (1,000) (3,320,000)   12,553,000      
Employee stock purchase plan 367,000   187,000   180,000      
Common share options exercised 2,621,000   664,000   1,957,000      
Conversions of operating partnership units 0   71,000       (71,000)  
Cash distributions declared to equity holders (113,377,000)     (110,983,000)     (2,394,000)  
Redemption of perpetual preferred units 0              
Ending Balance at Jun. 30, 2013 $ 2,705,130,000 $ 967,000 $ 3,625,283,000 $ (574,286,000) $ (410,665,000) $ (1,035,000) $ 64,866,000