Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Lease income	$ 266,357	$ 274,537
Other property income	1,953	2,305
Management, transaction, and other fees	6,393	6,816
Total revenues	274,703	283,658
Operating expenses:
Depreciation and amortization	77,259	89,295
Operating and maintenance	45,582	42,369
General and administrative	21,287	13,705
Real estate taxes	36,166	35,887
Other operating expenses	698	1,337
Total operating expenses	180,992	182,593
Other expense (income):
Interest expense, net	36,936	37,436
Goodwill impairment		132,128
Provision for impairment of real estate, net of tax		784
Gain on sale of real estate, net of tax	(11,698)	(38,005)
Net investment (income) loss	(1,486)	4,923
Total other expense (income)	23,752	137,266
Income (loss) from operations before equity in income of investments in real estate partnerships	69,959	(36,201)
Equity in income of investments in real estate partnerships	11,666	11,418
Net income (loss)	81,625	(24,783)
Noncontrolling interests:
Exchangeable operating partnership units	(364)	115
Limited partners’ interests in consolidated partnerships	(605)	(664)
Income attributable to noncontrolling interests	(969)	(549)
Net income attributable to common stockholders	$ 80,656	$ (25,332)
Income (loss) per common share - basic	$ 0.48	$ (0.15)
Income (loss) per common share - diluted	$ 0.47	$ (0.15)
Partnership Interest [Member]
Revenues:
Lease income	$ 266,357	$ 274,537
Other property income	1,953	2,305
Management, transaction, and other fees	6,393	6,816
Total revenues	274,703	283,658
Operating expenses:
Depreciation and amortization	77,259	89,295
Operating and maintenance	45,582	42,369
General and administrative	21,287	13,705
Real estate taxes	36,166	35,887
Other operating expenses	698	1,337
Total operating expenses	180,992	182,593
Other expense (income):
Interest expense, net	36,936	37,436
Goodwill impairment		132,128
Provision for impairment of real estate, net of tax		784
Gain on sale of real estate, net of tax	(11,698)	(38,005)
Net investment (income) loss	(1,486)	4,923
Total other expense (income)	23,752	137,266
Income (loss) from operations before equity in income of investments in real estate partnerships	69,959	(36,201)
Equity in income of investments in real estate partnerships	11,666	11,418
Net income (loss)	81,625	(24,783)
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(605)	(664)
Income attributable to noncontrolling interests	(605)	(664)
Net income (loss) attributable to common unit holders	$ 81,020	$ (25,447)
Income (loss) per common share - basic	$ 0.48	$ (0.15)
Income (loss) per common share - diluted	$ 0.47	$ (0.15)