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Consolidated Statements Of Equity And Perpetual Preferred Units (USD $)
Common Shares Of Beneficial Interest [Member]
Additional Paid-In Capital [Member]
Distributions In Excess Of Net Income [Member]
Notes Receivable Secured By Common Shares [Member]
Treasury Shares, At Cost [Member]
Accumulated Other Comprehensive Loss [Member]
Noncontrolling Interests [Member]
Perpetual Preferred Units [Member]
Total
Perpetual preferred units, Beginning Balance at Dec. 31, 2008               $ 97,925,000  
Beginning Balance at Dec. 31, 2008 660,000 2,237,703,000 (312,309,000) (295,000) (463,209,000) (51,056,000) 89,862,000   1,501,356,000
Net income (loss)     (50,800,000)       (403,000) 7,000,000 (51,203,000)
Other comprehensive income           9,901,000     9,901,000
Common shares issued 104,000 272,008,000             272,112,000
Net share awards 2,000 10,157,000             10,159,000
Employee share purchase plan   105,000     1,027,000       1,132,000
Repayment of employee notes receivable, net       194,000         194,000
Common share options exercised   1,275,000             1,275,000
Conversions and redemptions of operating partnership units 2,000 3,759,000         (3,777,000)   (16,000)
Common shares repurchased         (6,000)       (6,000)
Purchase of noncontrolling interests   647,000         (748,000)   (101,000)
Cash distributions declared to perpetual preferred units               (7,000,000)  
Cash distributions declared to equity holders     (129,462,000)       (6,332,000)   (135,794,000)
Other 2,000 2,000             4,000
Perpetual preferred units, Ending Balance at Dec. 31, 2009               97,925,000  
Ending Balance at Dec. 31, 2009 770,000 2,525,656,000 (492,571,000) (101,000) (462,188,000) (41,155,000) 78,602,000   1,609,013,000
Net income (loss)     23,216,000       926,000 7,000,000 24,142,000
Other comprehensive income           7,697,000     7,697,000
Common shares issued 49,000 231,602,000             231,651,000
Net share awards 4,000 11,609,000             11,613,000
Employee share purchase plan   232,000     933,000       1,165,000
Repayment of employee notes receivable, net       101,000         101,000
Common share options exercised   2,997,000             2,997,000
Conversions and redemptions of operating partnership units 3,000 3,525,000         (3,553,000)   (25,000)
Cash distributions declared to perpetual preferred units               (7,000,000)  
Cash distributions declared to equity holders     (125,962,000)       (5,046,000)   (131,008,000)
Other (2,000) 4,000         25,000   27,000
Perpetual preferred units, Ending Balance at Dec. 31, 2010               97,925,000 97,925,000
Ending Balance at Dec. 31, 2010 824,000 2,775,625,000 (595,317,000)   (461,255,000) (33,458,000) 70,954,000   1,757,373,000
Net income (loss)     49,379,000       3,582,000 7,000,000 52,961,000
Other comprehensive income           32,775,000     32,775,000
Common shares issued 18,000 106,553,000             106,571,000
Net share awards 3,000 12,592,000     812,000       13,407,000
Employee share purchase plan   446,000     1,334,000       1,780,000
Common share options exercised   5,216,000     7,106,000       12,322,000
Conversions and redemptions of operating partnership units 1,000 591,000         (592,000)    
Cash distributions declared to perpetual preferred units               (7,000,000)  
Cash distributions declared to equity holders     (144,528,000)       (4,893,000)   (149,421,000)
Other (1,000) 1,000              
Perpetual preferred units, Ending Balance at Dec. 31, 2011               97,925,000 97,925,000
Ending Balance at Dec. 31, 2011 $ 845,000 $ 2,901,024,000 $ (690,466,000)   $ (452,003,000) $ (683,000) $ 69,051,000   $ 1,827,768,000