Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Real estate assets:
Operating properties, net of accumulated depreciation of $791,431 and $803,073 in 2021 and 2020, respectively	$ 5,917,710	$ 6,232,546
Projects under development	113,841	57,389
Land	153,938	162,406
Total properties	6,185,489	6,452,341
Real estate assets and other assets held for sale, net	260,247	125,746
Cash and cash equivalents	9,792	4,290
Restricted cash	1,256	1,848
Accounts receivable	22,626	20,248
Deferred rents receivable	146,712	138,341
Investment in unconsolidated joint ventures	112,718	125,481
Intangible assets, net	155,918	189,164
Other assets	51,212	49,939
Total assets	6,945,970	7,107,398
Liabilities:
Notes payable	2,050,173	2,162,719
Accounts payable and accrued expenses	172,172	186,267
Deferred income	78,331	62,319
Intangible liabilities, net	55,313	69,846
Other liabilities	111,695	118,103
Liabilities of real estate assets held for sale, net	10,882	12,606
Total liabilities	2,478,566	2,611,860
Commitments and contingencies
Stockholders' investment:
Common stock, $1 par value per share, 300,000,000 shares authorized, 151,272,969 and 151,149,289 shares issued and outstanding in 2021 and 2020, respectively	151,273	151,149
Additional paid-in capital	5,546,336	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	(1,113,273)	(1,078,304)
Total stockholders' investment	4,435,863	4,467,134
Nonredeemable noncontrolling interests	31,541	28,404
Total equity	4,467,404	4,495,538
Total liabilities and equity	$ 6,945,970	$ 7,107,398