Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
ASSETS
Operating (including $68,930 and $78,846 of consolidated variable interest entities, respectively)	$ 3,812,705	$ 3,695,848
Construction-in-progress	207,715	163,200
Assets held for sale/disposal (discontinued operations) (including $0 and $18,311 of consolidated variable interest entities, respectively)	4,203	36,894
Real Estate Investment Property, At Cost, Total	4,024,623	3,895,942
Less accumulated depreciation and amortization (including $4,727 and $4,431 of consolidated variable interest entities, respectively)	(1,102,997)	(1,035,204)
Net real estate	2,921,626	2,860,738
Cash and cash equivalents	22,070	15,797
Accounts and notes receivable, net	78,503	68,997
Mortgage notes receivable, net	56,076	44,813
Investment in real estate partnerships	57,828	51,606
Prepaid expenses and other assets	109,421	110,686
Debt issuance costs, net of accumulated amortization of $8,384 and $9,075, respectively	9,324	6,916
TOTAL ASSETS	3,254,848	3,159,553
Liabilities
Mortgages payable (including $22,287 and $22,785 of consolidated variable interest entities, respectively)	484,502	529,501
Capital lease obligations	63,455	59,940
Notes payable	178,232	97,881
Senior notes and debentures	1,004,686	1,079,827
Accounts payable and accrued expenses	89,623	102,574
Dividends payable	44,195	41,601
Security deposits payable	12,038	11,751
Other liabilities and deferred credits	54,990	55,348
Total liabilities	1,931,721	1,978,423
Commitments and contingencies (Note 8)
Shareholders' equity
Preferred shares, authorized 15,000,000 shares, $.01 par: 5.417% Series 1 Cumulative Convertible Preferred Shares, (stated at liquidation preference $25 per share), 399,896 shares issued and outstanding	9,997	9,997
Common shares of beneficial interest, $.01 par, 100,000,000 shares authorized, 63,494,277 and 61,526,418 shares issued and outstanding, respectively	635	615
Additional paid-in capital	1,824,254	1,666,803
Accumulated dividends in excess of net income	(542,480)	(527,582)
Total shareholders' equity of the Trust	1,292,406	1,149,833
Noncontrolling interests	30,721	31,297
Total shareholders' equity	1,323,127	1,181,130
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 3,254,848	$ 3,159,553