Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Real estate assets:
Operating properties, net of accumulated depreciation of $459,423 and $421,495 in 2019 and 2018, respectively	$ 3,714,115	$ 3,603,011
Projects under development	35,282	24,217
Land	35,868	72,563
Total real estate assets	3,785,265	3,699,791
Cash and cash equivalents	3,456	2,547
Restricted cash	170	148
Notes and accounts receivable	10,558	13,821
Deferred rents receivable	91,240	83,116
Investment in unconsolidated joint ventures	167,429	161,907
Intangible assets, net	146,994	145,883
Other assets	46,081	39,083
Total assets	4,251,193	4,146,296
Liabilities:
Notes payable	1,116,474	1,062,570
Accounts payable and accrued expenses	91,477	110,159
Deferred income	55,074	41,266
Intangible liabilities, net of accumulated amortization of $45,545 and $42,473 in 2019 and 2018, respectively	53,869	56,941
Other liabilities	106,070	54,204
Total liabilities	1,422,964	1,325,140
Commitments and contingencies
Stockholders' investment:
Preferred stock, $1 par value, 20,000,000 shares authorized, 6,867,357 shares issued and outstanding in 2019 and 2018	6,867	6,867
Common stock, $1 par value, 700,000,000 shares authorized, 430,926,519 and 430,724,520 shares issued in 2019 and 2018, respectively	430,927	430,725
Additional paid-in capital	3,605,692	3,606,191
Treasury stock at cost, 10,339,735 shares in 2019 and 2018	(148,473)	(148,473)
Distributions in excess of cumulative net income	(1,124,596)	(1,129,445)
Total stockholders' investment	2,770,417	2,765,865
Nonredeemable noncontrolling interests	57,812	55,291
Total equity	2,828,229	2,821,156
Total liabilities and equity	$ 4,251,193	$ 4,146,296