Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Lease income	$ 292,864	$ 276,730	$ 586,509	$ 543,087
Other property income	2,720	3,074	5,824	5,027
Management, transaction, and other fees	6,499	7,355	13,183	13,748
Total revenues	302,083	287,159	605,516	561,862
Operating expenses:
Depreciation and amortization	79,350	74,217	157,192	151,476
Operating and maintenance	47,750	46,566	94,211	92,148
General and administrative	17,645	19,187	36,437	40,474
Real estate taxes	36,700	35,447	73,569	71,613
Other operating expenses	617	1,177	2,790	1,875
Total operating expenses	182,062	176,594	364,199	357,586
Other expense (income):
Interest expense, net	36,699	35,812	73,437	72,748
Provision for impairment of real estate, net of tax		135		135
Gain on sale of real estate, net of tax	(4,291)	(19,781)	(106,239)	(31,479)
Net investment loss (income)	5,468	(1,998)	7,962	(3,484)
Total other expense (income)	37,876	14,168	(24,840)	37,920
Income from operations before equity in income of investments in real estate partnerships	82,145	96,397	266,157	166,356
Equity in income of investments in real estate partnerships	23,842	435	36,646	12,101
Net income	105,987	96,832	302,803	178,457
Noncontrolling interests:
Exchangeable operating partnership units	(452)	(432)	(1,315)	(796)
Limited partners' interests in consolidated partnerships	(739)	(910)	(1,464)	(1,515)
Income attributable to noncontrolling interests	(1,191)	(1,342)	(2,779)	(2,311)
Net income attributable to common stockholders	$ 104,796	$ 95,490	$ 300,024	$ 176,146
Income per common share - basic	$ 0.61	$ 0.56	$ 1.75	$ 1.04
Income per common share - diluted	$ 0.61	$ 0.56	$ 1.74	$ 1.04
Partnership Interest [Member]
Revenues:
Lease income	$ 292,864	$ 276,730	$ 586,509	$ 543,087
Other property income	2,720	3,074	5,824	5,027
Management, transaction, and other fees	6,499	7,355	13,183	13,748
Total revenues	302,083	287,159	605,516	561,862
Operating expenses:
Depreciation and amortization	79,350	74,217	157,192	151,476
Operating and maintenance	47,750	46,566	94,211	92,148
General and administrative	17,645	19,187	36,437	40,474
Real estate taxes	36,700	35,447	73,569	71,613
Other operating expenses	617	1,177	2,790	1,875
Total operating expenses	182,062	176,594	364,199	357,586
Other expense (income):
Interest expense, net	36,699	35,812	73,437	72,748
Provision for impairment of real estate, net of tax		135		135
Gain on sale of real estate, net of tax	(4,291)	(19,781)	(106,239)	(31,479)
Net investment loss (income)	5,468	(1,998)	7,962	(3,484)
Total other expense (income)	37,876	14,168	(24,840)	37,920
Income from operations before equity in income of investments in real estate partnerships	82,145	96,397	266,157	166,356
Equity in income of investments in real estate partnerships	23,842	435	36,646	12,101
Net income	105,987	96,832	302,803	178,457
Noncontrolling interests:
Limited partners' interests in consolidated partnerships	(739)	(910)	(1,464)	(1,515)
Income attributable to noncontrolling interests	(739)	(910)	(1,464)	(1,515)
Net income attributable to common unit holders	$ 105,248	$ 95,922	$ 301,339	$ 176,942
Income per common share - basic	$ 0.61	$ 0.56	$ 1.75	$ 1.04
Income per common share - diluted	$ 0.61	$ 0.56	$ 1.74	$ 1.04