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Condensed Consolidated Balance Sheets (USD $)
In Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Assets    
Land $ 760,397 $ 760,397
Buildings and improvements 4,711,552 4,680,361
Real estate assets, at cost, total 5,471,949 5,440,758
Accumulated depreciation (1,378,630) (1,292,924)
Net operating real estate assets 4,093,319 4,147,834
Properties under development, including land 237,549 206,919
Investments in joint ventures 39,398 27,632
Total real estate assets 4,370,266 4,382,385
Accounts receivable - affiliates 30,401 31,895
Notes receivable - affiliates   3,194
Other assets, net 90,346 106,175
Cash and cash equivalents 63,148 170,575
Restricted cash 4,898 5,513
Total assets 4,559,059 4,699,737
Liabilities    
Total unsecured notes payable 1,380,368 1,507,757
Secured 1,053,699 1,055,997
Accounts payable and accrued expenses 78,460 81,556
Accrued real estate taxes 27,424 22,338
Distributions payable 38,966 35,295
Other liabilities 123,829 141,496
Total liabilities 2,702,746 2,844,439
Commitments and contingencies    
Perpetual preferred units 97,925 97,925
Equity    
Common shares of beneficial interest; $0.01 par value per share; 100,000 shares authorized; 86,262 and 85,130 issued; 83,364 and 82,386 outstanding at June 30, 2011 and December 31, 2010, respectively 834 824
Additional paid-in capital 2,823,690 2,775,625
Distributions in excess of net income attributable to common shareholders (676,367) (595,317)
Treasury shares, at cost (12,707 and 12,766 common shares at June 30, 2011 and December 31, 2010, respectively) (459,134) (461,255)
Accumulated other comprehensive income (loss) 93 (33,458)
Total common equity 1,689,116 1,686,419
Noncontrolling interests 69,272 70,954
Total equity 1,758,388 1,757,373
Total liabilities and equity $ 4,559,059 $ 4,699,737