CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Rental revenue	$ 702,819,000	$ 690,418,000	$ 679,015,000
Fee and other income	37,558,000	36,368,000	35,222,000
Total revenues	740,377,000	726,786,000	714,237,000
Expenses:
Operating	277,422,000	265,438,000	267,587,000
Depreciation and amortization	232,517,000	232,487,000	235,200,000
General and administrative	59,487,000	59,132,000	64,917,000
Transaction related costs	470,000	916,000	1,096,000
Total expenses	569,896,000	557,973,000	568,800,000
Other income (expense):
Loss from real estate related fund investments	(2,233,000)	0	0
(Loss) income from unconsolidated real estate funds	(1,239,000)	782,000	272,000
Loss from unconsolidated joint ventures	(53,251,000)	(24,896,000)	(18,619,000)
Interest and other income, net	5,174,000	3,017,000	4,490,000
Interest and debt expense	(143,864,000)	(142,014,000)	(144,208,000)
(Loss) income from continuing operations, before income taxes	(24,932,000)	5,702,000	(12,628,000)
Income tax expense	(3,265,000)	(3,643,000)	(1,493,000)
(Loss) income from continuing operations, net	(28,197,000)	2,059,000	(14,121,000)
Loss from discontinued operations, net	0	0	(5,075,000)
Net (loss) income	(28,197,000)	2,059,000	(19,196,000)
Less net (income) loss attributable to noncontrolling interests in:
Consolidated joint ventures	(13,981,000)	(21,538,000)	(9,257,000)
Consolidated real estate related funds	3,342,000	(2,893,000)	1,450,000
Operating Partnership	2,433,000	2,018,000	2,299,000
Net loss attributable to common stockholders	$ (36,403,000)	$ (20,354,000)	$ (24,704,000)
Loss per Common Share - Basic:
Loss from continuing operations, net	$ (0.16)	$ (0.09)	$ (0.09)
Loss from discontinued operations, net	0	0	(0.02)
Net loss per common share	$ (0.16)	$ (0.09)	$ (0.11)
Weighted average common shares outstanding	221,309,938	218,701,249	222,436,170
Loss per Common Share - Diluted:
Loss from continuing operations, net	$ (0.16)	$ (0.09)	$ (0.09)
Loss from discontinued operations, net	0	0	(0.02)
Net loss per common share	$ (0.16)	$ (0.09)	$ (0.11)
Weighted average common shares outstanding	221,309,938	218,701,249	222,436,170