Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
ASSETS
Operating (including $281,960 and $265,138 of consolidated variable interest entities, respectively)	$ 5,052,378	$ 4,618,258
Construction-in-progress	484,414	531,205
Real Estate Investment Property, at Cost, total	5,536,792	5,149,463
Less accumulated depreciation and amortization (including $24,714 and $19,086 of consolidated variable interest entities, respectively)	1,431,466	1,350,471
Net real estate	4,105,326	3,798,992
Cash and cash equivalents	23,917	88,927
Accounts and notes receivable, net	104,746	84,838
Mortgage notes receivable, net	51,191	55,155
Investment in real estate partnership	32,717	32,264
Prepaid expenses and other assets	148,427	145,062
Debt issuance costs, net of accumulated amortization of $11,653 and $9,535, respectively	13,074	14,056
TOTAL ASSETS	4,479,398	4,219,294
Liabilities
Mortgages payable (including $188,189 and $202,782 of consolidated variable interest entities)	630,261	588,456
Capital lease obligations	71,653	71,671
Notes payable	301,556	300,822
Senior notes and debentures	1,361,466	1,360,913
Accounts payable and accrued expenses	160,205	156,270
Dividends payable	60,205	52,385
Security deposits payable	13,729	12,772
Other liabilities and deferred credits	107,859	100,283
Total liabilities	2,706,934	2,643,572
Commitments and contingencies (Note 7)
Redeemable noncontrolling interests	110,865	104,425
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, 68,128,519 and 66,701,422 shares issued and outstanding, respectively	682	667
Additional paid-in capital	2,223,737	2,062,708
Accumulated dividends in excess of net income	(659,334)	(623,795)
Accumulated other comprehensive loss	(1,760)	(1,417)
Total shareholders’ equity of the Trust	1,573,322	1,448,160
Noncontrolling interests	88,277	23,137
Total shareholders’ equity	1,661,599	1,471,297
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 4,479,398	$ 4,219,294