CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Real estate properties:
Land	$ 286,186	$ 389,410
Buildings and improvements	2,570,704	3,497,942
Total real estate properties, at cost, gross	2,856,890	3,887,352
Accumulated depreciation	(755,255)	(898,939)
Total real estate properties, at cost, net	2,101,635	2,988,413
Acquired real estate leases, net	48,281	88,760
Cash and cash equivalents	2,094,674	1,802,729
Restricted cash	6,532	32,245
Rents receivable, net of allowance for doubtful accounts of $5,105 and $7,715, respectively	152,031	174,676
Other assets, net	122,922	144,341
Total assets	4,526,075	5,231,164
LIABILITIES AND SHAREHOLDERS’ EQUITY
Senior unsecured debt, net	1,063,950	1,450,606
Mortgage notes payable, net	77,717	246,510
Accounts payable and accrued expenses	95,395	123,587
Assumed real estate lease obligations, net	1,946	4,296
Rent collected in advance	18,460	27,340
Security deposits	8,160	10,338
Total liabilities	1,265,628	1,862,677
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; 123,994,465 and 126,349,914 shares issued and outstanding, respectively	1,240	1,263
Additional paid in capital	4,363,177	4,414,611
Cumulative net income	2,566,603	2,333,709
Cumulative other comprehensive loss	(208)	(3,687)
Cumulative common distributions	(3,111,868)	(3,111,868)
Cumulative preferred distributions	(677,760)	(650,195)
Total shareholders’ equity	3,260,447	3,368,487
Total liabilities and shareholders’ equity	4,526,075	5,231,164
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 shares issued and outstanding, respectively, aggregate liquidation preference of $122,880	119,263	119,263
Total shareholders’ equity	119,263	119,263
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; 0 and 11,000,000 shares issued and outstanding, respectively, aggregate liquidation preference $0 and $275,000, respectively	0	265,391
Total shareholders’ equity	$ 0	$ 265,391