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Condensed Consolidated Statements of Equity (USD $)
In Thousands
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 Income (Loss) [Member]
Noncontrolling Interests [Member]
Perpetual Preferred Units [Member]
Total
Perpetual preferred units, Beginning Balance at Dec. 31, 2009               $ 97,925  
Beginning Balance at Dec. 31, 2009 770 2,525,656 (492,571) (101) (462,188) (41,155) 78,602   1,609,013
Net income (loss)     4,419       110 3,500 4,529
Less income allocated to perpetual preferred units                 3,500
Other comprehensive income           (2,563)     (2,563)
Common shares issued 23 106,399             106,422
Net share awards 4 6,021             6,025
Employee stock purchase plan   (190)     671       481
Common share options exercised 1 2,131             2,132
Conversions of operating partnership units 2 1,335         (1,337)    
Distributions to perpetual preferred units               (3,500)  
Cash distributions declared to equity holders     (61,887)       (2,573)   (64,460)
Other (2) 2   (1)         (1)
Perpetual preferred units, Ending Balance at Jun. 30, 2010               97,925  
Ending Balance at Jun. 30, 2010 798 2,641,354 (550,039) (102) (461,517) (43,718) 74,802   1,661,578
Perpetual preferred units, Beginning Balance at Dec. 31, 2010               97,925 97,925
Beginning Balance at Dec. 31, 2010 824 2,775,625 (595,317)   (461,255) (33,458) 70,954   1,757,373
Net income (loss)     (9,311)       1,357 3,500 (7,954)
Less income allocated to perpetual preferred units                 3,500
Other comprehensive income           33,551     33,551
Common shares issued 6 37,120             37,126
Net share awards 4 6,346     525       6,875
Employee stock purchase plan   232     788       1,020
Common share options exercised 1 3,774     808       4,583
Conversions of operating partnership units 1 591         (592)    
Distributions to perpetual preferred units               (3,500)  
Cash distributions declared to equity holders     (71,739)       (2,447)   (74,186)
Other (2) 2              
Perpetual preferred units, Ending Balance at Jun. 30, 2011               97,925 97,925
Ending Balance at Jun. 30, 2011 $ 834 $ 2,823,690 $ (676,367)   $ (459,134) $ 93 $ 69,272   $ 1,758,388