CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Real Estate:
Buildings and improvements	$ 11,052,578	$ 11,692,654
Development costs and construction in progress	429,459	400,619
Land	1,752,890	1,881,487
Accumulated depreciation and amortization	(2,699,174)	(2,648,930)
Net real estate	10,535,753	11,325,830
Net investment in direct financing leases	715,104	752,589
Loans receivable, net	402,152	807,954
Investments in and advances to unconsolidated joint ventures	822,369	571,491
Accounts receivable, net of allowance of $4,312 and $4,459, respectively	34,571	45,116
Cash and cash equivalents	133,887	94,730
Restricted cash	27,135	42,260
Intangible assets, net	400,867	479,805
Assets held for sale, net	216,074	927,866
Other assets, net	616,169	711,624
Total assets	13,904,081	15,759,265
LIABILITIES AND EQUITY
Bank line of credit	605,837	899,718
Term loans	226,205	440,062
Senior unsecured notes	6,393,926	7,133,538
Mortgage debt	145,417	623,792
Other debt	94,818	92,385
Intangible liabilities, net	53,427	58,145
Liabilities of assets held for sale, net	8,653	3,776
Accounts payable and accrued liabilities	381,189	417,360
Deferred revenue	140,378	149,181
Total liabilities	8,049,850	9,817,957
Commitments and contingencies
Common stock, $1.00 par value: 750,000,000 shares authorized; 469,034,877 and 468,081,489 shares issued and outstanding, respectively	469,035	468,081
Additional paid-in capital	8,224,531	8,198,890
Cumulative dividends in excess of earnings	(3,137,642)	(3,089,734)
Accumulated other comprehensive income (loss)	(24,491)	(29,642)
Total stockholders' equity	5,531,433	5,547,595
Joint venture partners	145,496	214,377
Non-managing member unitholders	177,302	179,336
Total noncontrolling interests	322,798	393,713
Total equity	5,854,231	5,941,308
Total liabilities and equity	$ 13,904,081	$ 15,759,265