Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Real estate assets:
Operating properties, net of accumulated depreciation of $217,925 and $215,856 in 2017 and 2016, respectively	$ 3,479,262	$ 3,432,522
Projects under development	203,562	162,387
Land	4,221	4,221
Total properties	3,687,045	3,599,130
Cash and cash equivalents	16,420	35,687
Restricted cash	8,139	15,634
Notes and accounts receivable, net of allowance for doubtful accounts of $1,425 and $1,167 in 2017 and 2016, respectively	20,530	27,683
Deferred rents receivable	47,240	39,464
Investment in unconsolidated joint ventures	101,532	179,397
Intangible assets, net of accumulated amortization of $85,341 and $53,483 in 2017 and 2016, respectively	225,860	245,529
Other assets	29,280	29,083
Total assets	4,136,046	4,171,607
Liabilities:
Notes payable	1,019,619	1,380,920
Accounts payable and accrued expenses	128,772	109,278
Deferred income	34,743	33,304
Intangible liabilities, net of accumulated amortization of $21,543 and $12,227 in 2017 and 2016, respectively	80,466	89,781
Other liabilities	42,769	44,084
Total liabilities	1,306,369	1,657,367
Commitments and contingencies
Stockholders' investment:
Preferred stock, $1 par value, 20,000,000 shares authorized, 6,867,357 shares issued and outstanding in 2017 and 2016	6,867	6,867
Common stock, $1 par value, 700,000,000 shares authorized, 430,296,523 and 403,746,938 shares issued in 2017 and 2016, respectively	430,297	403,747
Additional paid-in capital	3,604,036	3,407,430
Treasury stock at cost, 10,329,082 shares in 2017 and 2016	(148,373)	(148,373)
Distributions in excess of cumulative net income	(1,114,662)	(1,214,114)
Total stockholders' investment	2,778,165	2,455,557
Nonredeemable noncontrolling interests	51,512	58,683
Total equity	2,829,677	2,514,240
Total liabilities and equity	$ 4,136,046	$ 4,171,607