Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Real estate assets:
Operating properties, net of accumulated depreciation of $863,365 and $803,073 in 2021 and 2020, respectively	$ 6,197,447	$ 6,232,546
Projects under development	74,485	57,389
Land	170,579	162,406
Total properties	6,442,511	6,452,341
Real estate assets and other assets held for sale, net	134,184	125,746
Cash and cash equivalents	14,576	4,290
Restricted cash	1,256	1,848
Accounts receivable	21,679	20,248
Deferred rents receivable	145,433	138,341
Investment in unconsolidated joint ventures	113,353	125,481
Intangible assets, net	177,146	189,164
Other assets	56,044	49,939
Total assets	7,106,182	7,107,398
Liabilities:
Notes payable	2,214,692	2,162,719
Accounts payable and accrued expenses	141,948	186,267
Deferred income	76,033	62,319
Intangible liabilities, net of accumulated amortization of $77,891 and $73,967 in 2021 and 2020, respectively	65,922	69,846
Other liabilities	115,895	118,103
Liabilities of real estate assets held for sale, net	10,444	12,606
Total liabilities	2,624,934	2,611,860
Commitments and contingencies
Stockholders' investment:
Common stock, $1 par value per share, 300,000,000 shares authorized, 151,239,770 and 151,149,289 shares issued and outstanding in 2021 and 2020, respectively	151,240	151,149
Additional paid-in capital	5,543,549	5,542,762
Treasury stock at cost, 2,584,933 shares in 2021 and 2020	(148,473)	(148,473)
Distributions in excess of cumulative net income	(1,095,361)	(1,078,304)
Total stockholders' investment	4,450,955	4,467,134
Nonredeemable noncontrolling interests	30,293	28,404
Total equity	4,481,248	4,495,538
Total liabilities and equity	$ 7,106,182	$ 7,107,398