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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Assets    
Land $ 768,016 $ 760,397
Buildings and improvements 4,751,654 4,680,361
Real estate assets, at cost, total 5,519,670 5,440,758
Accumulated depreciation (1,432,799) (1,292,924)
Net operating real estate assets 4,086,871 4,147,834
Properties under development, including land 299,870 206,919
Investments in joint ventures 44,844 27,632
Properties held for sale 11,131  
Total real estate assets 4,442,716 4,382,385
Accounts receivable - affiliates 31,035 31,895
Notes receivable - affiliates    3,194
Other assets, net 88,089 106,175
Cash and cash equivalents 55,159 170,575
Restricted cash 5,076 5,513
Total assets 4,622,075 4,699,737
Liabilities    
Unsecured notes payable 1,380,755 1,507,757
Secured notes payable 1,051,357 1,055,997
Accounts payable and accrued expenses 93,747 81,556
Accrued real estate taxes 21,883 22,338
Distributions payable 39,364 35,295
Other liabilities 109,276 141,496
Total liabilities 2,696,382 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; 87,377 and 85,130 issued; 84,517 and 82,386 outstanding at December 31, 2011 and 2010, respectively 845 824
Additional paid-in capital 2,901,024 2,775,625
Distributions in excess of net income attributable to common shareholders (690,466) (595,317)
Treasury shares, at cost (12,509 and 12,766 common shares, at December 31, 2011 and 2010, respectively) (452,003) (461,255)
Accumulated other comprehensive loss (683) (33,458)
Total common equity 1,758,717 1,686,419
Noncontrolling interests 69,051 70,954
Total equity 1,827,768 1,757,373
Total liabilities and equity $ 4,622,075 $ 4,699,737