Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Real estate assets:
Operating properties, net of accumulated depreciation of $384,097 and $275,977 in 2018 and 2017, respectively	$ 3,499,741	$ 3,332,619
Projects under development	128,580	280,982
Land	4,221	4,221
Total properties	3,632,542	3,617,822
Cash and cash equivalents	82,706	148,929
Restricted cash	419	56,816
Notes and accounts receivable, net of allowance for doubtful accounts of $456 and $535 in 2018 and 2017, respectively	10,400	14,420
Deferred rents receivable	76,494	58,158
Investment in unconsolidated joint ventures	154,070	101,414
Intangible assets, net	155,025	186,206
Other assets	31,943	20,854
Total assets	4,143,599	4,204,619
Liabilities:
Notes payable	1,065,012	1,093,228
Accounts payable and accrued expenses	114,229	137,909
Deferred income	40,035	37,383
Intangible liabilities, net of accumulated amortization of $39,332 and $28,960 in 2018 and 2017, respectively	60,082	70,454
Other liabilities	39,786	40,534
Total liabilities	1,319,144	1,379,508
Commitments and contingencies
Stockholders' investment:
Preferred stock, $1 par value, 20,000,000 shares authorized, 6,867,357 shares issued and outstanding in 2018 and 2017	6,867	6,867
Common stock, $1 par value, 700,000,000 shares authorized, 430,724,520 and 430,349,620 shares issued in 2018 and 2017, respectively	430,725	430,350
Additional paid-in capital	3,605,617	3,604,776
Treasury stock at cost, 10,339,735 and 10,329,082 shares in 2018 and 2017, respectively	(148,473)	(148,373)
Distributions in excess of cumulative net income	(1,124,518)	(1,121,647)
Total stockholders' investment	2,770,218	2,771,973
Nonredeemable noncontrolling interests	54,237	53,138
Total equity	2,824,455	2,825,111
Total liabilities and equity	$ 4,143,599	$ 4,204,619