CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Real estate properties, at cost:
Land	$ 1,453,399	$ 1,360,773
Buildings, improvements and equipment	5,445,710	4,879,908
Total real estate properties, gross	6,899,109	6,240,681
Accumulated depreciation	(1,551,160)	(1,367,868)
Total real estate properties, net	5,347,949	4,872,813
Properties held for sale		18,440
Cash and cash equivalents	20,049	8,303
Restricted cash (FF&E reserve escrow)	40,744	50,196
Other assets, net	226,383	183,821
Total assets	5,635,125	5,133,573
LIABILITIES AND SHAREHOLDERS' EQUITY
Unsecured revolving credit facility	320,000	149,000
Unsecured term loan	400,000
Senior notes, net of discounts	1,993,880	1,887,891
Convertible senior notes, net of discount	8,478	78,823
Security deposits	26,577	106,422
Accounts payable and other liabilities	132,032	103,668
Due to related persons	13,696	3,713
Dividends payable	6,664	4,754
Total liabilities	2,901,327	2,334,271
Commitments and contingencies
Preferred shares of beneficial interest, no par value, 100,000,000 shares authorized:
Common shares of beneficial interest, $.01 par value; 200,000,000 shares authorized; 123,637,424 and 123,521,535 issued and outstanding, respectively	1,236	1,235
Additional paid in capital	3,458,144	3,463,534
Cumulative net income	2,384,876	2,232,953
Cumulative other comprehensive income	2,770	1,605
Cumulative preferred distributions	(253,426)	(213,281)
Cumulative common distributions	(3,301,782)	(3,076,883)
Total shareholders' equity	2,733,798	2,799,302
Total liabilities and shareholders' equity	5,635,125	5,133,573
Series B
Preferred shares of beneficial interest, no par value, 100,000,000 shares authorized:
Preferred shares		83,306
Series C
Preferred shares of beneficial interest, no par value, 100,000,000 shares authorized:
Preferred shares	161,873	306,833
Series D
Preferred shares of beneficial interest, no par value, 100,000,000 shares authorized:
Preferred shares	$ 280,107