CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Real estate:
Buildings and improvements	$ 10,956,474	$ 11,239,732
Development costs and construction in progress	442,007	447,976
Land	1,663,069	1,785,865
Accumulated depreciation and amortization	(2,825,850)	(2,741,695)
Net real estate	10,235,700	10,731,878
Net investment in direct financing leases	714,709	714,352
Loans receivable, net	41,302	313,326
Investments in and advances to unconsolidated joint ventures	623,255	800,840
Accounts receivable, net of allowance of $4,552 and $4,425, respectively	48,701	40,733
Cash and cash equivalents	78,864	55,306
Restricted cash	29,877	26,897
Intangible assets, net	305,805	410,082
Assets held for sale, net	423,063	417,014
Other assets, net	582,682	578,033
Total assets	13,083,958	14,088,461
LIABILITIES AND EQUITY
Bank line of credit	636,709	1,017,076
Term loan	223,468	228,288
Senior unsecured notes	5,706,181	6,396,451
Mortgage debt	139,401	144,486
Other debt	92,494	94,165
Intangible liabilities, net	56,871	52,579
Liabilities of assets held for sale, net	3,146	14,031
Accounts payable and accrued liabilities	410,804	401,738
Deferred revenue	174,509	144,709
Total liabilities	7,443,583	8,493,523
Commitments and contingencies
Common stock, $1.00 par value: 750,000,000 shares authorized; 469,916,246 and 469,435,678 shares issued and outstanding, respectively	469,916	469,436
Additional paid-in capital	8,189,946	8,226,113
Cumulative dividends in excess of earnings	(3,584,397)	(3,370,520)
Accumulated other comprehensive income (loss)	(4,297)	(24,024)
Total stockholders' equity	5,071,168	5,301,005
Joint venture partners	392,319	117,045
Non-managing member unitholders	176,888	176,888
Total noncontrolling interests	569,207	293,933
Total equity	5,640,375	5,594,938
Total liabilities and equity	$ 13,083,958	$ 14,088,461