Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Lease income	$ 304,458	$ 292,864	$ 613,259	$ 586,509
Other property income	2,683	2,720	5,821	5,824
Management, transaction, and other fees	7,106	6,499	13,144	13,183
Total revenues	314,247	302,083	632,224	605,516
Operating expenses:
Depreciation and amortization	83,161	79,350	165,868	157,192
Property operating expense	54,394	47,750	105,416	94,211
Real estate taxes	38,509	36,700	76,986	73,569
General and administrative	25,065	17,645	50,345	36,437
Other operating expenses	1,682	617	1,185	2,790
Total operating expenses	202,811	182,062	399,800	364,199
Other expense (income):
Interest expense, net	36,956	36,699	73,349	73,437
Gain on sale of real estate, net of tax	(81)	(4,291)	(331)	(106,239)
Net investment (income) loss	(1,742)	5,468	(3,469)	7,962
Total other expense (income)	35,133	37,876	69,549	(24,840)
Income from operations before equity in income of investments in real estate partnerships	76,303	82,145	162,875	266,157
Equity in income of investments in real estate partnerships	11,869	23,842	23,785	36,646
Net income	88,172	105,987	186,660	302,803
Noncontrolling interests:
Exchangeable operating partnership units	(550)	(452)	(970)	(1,315)
Limited partners' interests in consolidated partnerships	(840)	(739)	(1,627)	(1,464)
Income attributable to noncontrolling interests	(1,390)	(1,191)	(2,597)	(2,779)
Net income attributable to common shareholders	$ 86,782	$ 104,796	$ 184,063	$ 300,024
Income per common share - basic	$ 0.51	$ 0.61	$ 1.08	$ 1.75
Income per common share - diluted	$ 0.51	$ 0.61	$ 1.07	$ 1.74
Partnership Interest [Member]
Revenues:
Lease income	$ 304,458	$ 292,864	$ 613,259	$ 586,509
Other property income	2,683	2,720	5,821	5,824
Management, transaction, and other fees	7,106	6,499	13,144	13,183
Total revenues	314,247	302,083	632,224	605,516
Operating expenses:
Depreciation and amortization	83,161	79,350	165,868	157,192
Property operating expense	54,394	47,750	105,416	94,211
Real estate taxes	38,509	36,700	76,986	73,569
General and administrative	25,065	17,645	50,345	36,437
Other operating expenses	1,682	617	1,185	2,790
Total operating expenses	202,811	182,062	399,800	364,199
Other expense (income):
Interest expense, net	36,956	36,699	73,349	73,437
Gain on sale of real estate, net of tax	(81)	(4,291)	(331)	(106,239)
Net investment (income) loss	(1,742)	5,468	(3,469)	7,962
Total other expense (income)	35,133	37,876	69,549	(24,840)
Income from operations before equity in income of investments in real estate partnerships	76,303	82,145	162,875	266,157
Equity in income of investments in real estate partnerships	11,869	23,842	23,785	36,646
Net income	88,172	105,987	186,660	302,803
Noncontrolling interests:
Limited partners' interests in consolidated partnerships	(840)	(739)	(1,627)	(1,464)
Income attributable to noncontrolling interests	(840)	(739)	(1,627)	(1,464)
Net income attributable to common unit holders	$ 87,332	$ 105,248	$ 185,033	$ 301,339
Income per common share - basic	$ 0.51	$ 0.61	$ 1.08	$ 1.75
Income per common share - diluted	$ 0.51	$ 0.61	$ 1.07	$ 1.74