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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets    
Land $ 893,910 $ 768,016
Buildings and improvements 5,203,675 4,751,654
Real estate assets, at cost, total 6,097,585 5,519,670
Accumulated depreciation (1,505,862) (1,432,799)
Net operating real estate assets 4,591,723 4,086,871
Properties under development, including land 297,712 299,870
Investments in joint ventures 47,776 44,844
Properties held for sale 0 11,131
Total real estate assets 4,937,211 4,442,716
Accounts receivable - affiliates 29,940 31,035
Other assets, net 88,002 88,089
Cash and cash equivalents 52,126 55,159
Restricted cash 5,295 5,076
Total assets 5,112,574 4,622,075
Liabilities    
Unsecured notes payable 1,381,152 1,380,755
Secured notes payable 1,015,260 1,051,357
Accounts payable and accrued expenses 87,041 93,747
Accrued real estate taxes 31,607 21,883
Distributions payable 49,135 39,364
Other liabilities 83,471 109,276
Total liabilities 2,647,666 2,696,382
Commitments and contingencies      
Perpetual preferred units 0 97,925
Equity    
Common shares of beneficial interest; $0.01 par value per share; 175,000 shares authorized; 97,497 and 87,377 issued; 94,534 and 84,517 outstanding at June 30, 2012 and December 31, 2011, respectively 945 845
Additional paid-in capital 3,501,354 2,901,024
Distributions in excess of net income attributable to common shareholders (674,221) (690,466)
Treasury shares, at cost (11,926 and 12,509 common shares at June 30, 2012 and December 31, 2011, respectively) (430,958) (452,003)
Accumulated other comprehensive loss (667) (683)
Total common equity 2,396,453 1,758,717
Noncontrolling interests 68,455 69,051
Total equity 2,464,908 1,827,768
Total liabilities and equity $ 5,112,574 $ 4,622,075