Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Real estate assets:
Operating properties, net of accumulated depreciation of $803,073 and $577,139 in 2020 and 2019, respectively	$ 6,232,546	$ 5,669,324
Projects under development	57,389	410,097
Land	162,406	116,860
Total properties	6,452,341	6,196,281
Real estate assets and other assets held for sale, net of accumulated depreciation and amortization of $14,188 and $61,093 in 2020 and 2019, respectively	125,746	360,582
Cash and cash equivalents	4,290	15,603
Restricted cash	1,848	2,005
Notes and accounts receivable	20,248	23,680
Deferred rents receivable	138,341	102,314
Investment in unconsolidated joint ventures	125,481	133,884
Intangible assets, net	189,164	257,649
Other assets	49,939	59,449
Total assets	7,107,398	7,151,447
Liabilities:
Notes payable	2,162,719	2,222,975
Accounts payable and accrued expenses	186,267	209,904
Deferred income	62,319	52,269
Intangible liabilities, net of accumulated amortization of $73,967 and $55,798 in 2020 and 2019, respectively	69,846	83,105
Other liabilities	118,103	134,128
Liabilities of real estate assets held for sale, net of accumulated amortization of $1,205 and $7,771 in 2020 and 2019, respectively	12,606	21,231
Total liabilities	2,611,860	2,723,612
Commitments and contingencies
Stockholders' investment:
Preferred stock, $1 par value, 20,000,000 shares authorized, 1,716,837 shares issued and outstanding in 2019; no shares were issued or outstanding in 2020	0	1,717
Common stock, $1 par value, 300,000,000 shares authorized, and 151,149,289 and 149,347,382 shares issued and outstanding in 2020 and 2019, respectively	151,149	149,347
Additional paid-in capital	5,542,762	5,493,883
Treasury stock at cost, 2,584,933 shares in 2020 and 2019	(148,473)	(148,473)
Distributions in excess of cumulative net income	(1,078,304)	(1,137,200)
Total stockholders' investment	4,467,134	4,359,274
Nonredeemable noncontrolling interests	28,404	68,561
Total equity	4,495,538	4,427,835
Total liabilities and equity	$ 7,107,398	$ 7,151,447