CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real estate:
Buildings and improvements	$ 10,877,248	$ 11,239,732
Development costs and construction in progress	537,643	447,976
Land	1,637,506	1,785,865
Accumulated depreciation and amortization	(2,842,947)	(2,741,695)
Net real estate	10,209,450	10,731,878
Net investment in direct financing leases	713,818	714,352
Loans receivable, net	62,998	313,326
Investments in and advances to unconsolidated joint ventures	540,088	800,840
Accounts receivable, net of allowance of $5,127 and $4,425, respectively	48,171	40,733
Cash and cash equivalents	110,790	55,306
Restricted cash	29,056	26,897
Intangible assets, net	305,079	410,082
Assets held for sale, net	108,086	417,014
Other assets, net	591,017	578,033
Total assets	12,718,553	14,088,461
LIABILITIES AND EQUITY
Bank line of credit	80,103	1,017,076
Term loan	0	228,288
Senior unsecured notes	5,258,550	6,396,451
Mortgage debt	138,470	144,486
Other debt	90,785	94,165
Intangible liabilities, net	54,663	52,579
Liabilities of assets held for sale, net	1,125	14,031
Accounts payable and accrued liabilities	391,583	401,738
Deferred revenue	190,683	144,709
Total liabilities	6,205,962	8,493,523
Commitments and contingencies
Common stock, $1.00 par value: 750,000,000 shares authorized; 477,496,499 and 469,435,678 shares issued and outstanding, respectively	477,496	469,436
Additional paid-in capital	8,398,847	8,226,113
Cumulative dividends in excess of earnings	(2,927,196)	(3,370,520)
Accumulated other comprehensive income (loss)	(4,708)	(24,024)
Total stockholders' equity	5,944,439	5,301,005
Joint venture partners	391,401	117,045
Non-managing member unitholders	176,751	176,888
Total noncontrolling interests	568,152	293,933
Total equity	6,512,591	5,594,938
Total liabilities and equity	$ 12,718,553	$ 14,088,461