CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate properties:
Land	$ 389,410	$ 714,238
Buildings and improvements	3,497,942	5,014,205
Total real estate properties, at cost, gross	3,887,352	5,728,443
Accumulated depreciation	(898,939)	(1,030,445)
Total real estate properties, at cost, net	2,988,413	4,697,998
Acquired real estate leases, net	88,760	198,287
Cash and cash equivalents	1,802,729	364,516
Restricted cash	32,245	32,257
Rents receivable, net of allowance for doubtful accounts of $7,715 and $6,565, respectively	174,676	248,101
Other assets, net	157,549	220,480
Total assets	5,244,372	5,761,639
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	1,460,592	1,598,416
Mortgage notes payable, net	249,732	609,249
Accounts payable and accrued expenses	123,587	162,204
Assumed real estate lease obligations, net	4,296	26,784
Rent collected in advance	27,340	31,359
Security deposits	10,338	14,044
Total liabilities	$ 1,875,885	$ 2,442,056
Commitments and Contingencies
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Common shares of beneficial interest, $0.01 par value: 350,000,000 shares authorized; 126,349,914 and 129,607,279 shares issued and outstanding, respectively	$ 1,263	$ 1,296
Additional paid in capital	4,414,611	4,487,133
Cumulative net income	2,333,709	2,233,852
Cumulative other comprehensive loss	(3,687)	(53,216)
Cumulative common distributions	(3,111,868)	(3,111,868)
Cumulative preferred distributions	(650,195)	(622,271)
Total shareholders’ equity	3,368,487	3,319,583
Total liabilities and shareholders’ equity	5,244,372	5,761,639
Series D
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series D preferred shares; 6 1/2% cumulative convertible; 4,915,196 and 4,915,497 shares issued and outstanding, respectively, aggregate liquidation preference of $122,880 and $122,887, respectively	119,263	119,266
Total shareholders’ equity	119,263	119,266
Series E
Preferred shares of beneficial interest, $0.01 par value: 50,000,000 shares authorized;
Series E preferred shares; 7 1/4% cumulative redeemable on or after May 15, 2016; 11,000,000 shares issued and outstanding, aggregate liquidation preference $275,000	265,391	265,391
Total shareholders’ equity	$ 265,391	$ 265,391