Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Abstract]
Rental and other revenues	$ 825,862	$ 833,997	$ 828,929
Rental property and other expenses	272,173	268,782	259,806
Total net operating income	553,689	565,215	569,123
Reconciliation to net income:
Depreciation and amortization	(299,046)	(299,411)	(287,610)
Impairments of real estate assets	(24,600)	0	(36,515)
General and administrative expenses	(41,903)	(42,857)	(42,266)
Interest expense	(147,198)	(136,710)	(105,385)
Other income	12,337	4,435	1,530
Gains on disposition of property	46,817	47,773	63,546
Gain on deconsolidation of affiliate	0	11,778	0
Equity in earnings of unconsolidated affiliates	4,158	1,107	1,535
Net income	104,254	151,330	163,958
Total assets	6,029,355	6,002,928
Total Reportable Segment [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	769,079	776,827	767,568
Rental property and other expenses	245,898	243,227	234,560
Total net operating income	523,181	533,600	533,008
Reconciliation to net income:
Total assets	5,219,711	5,315,397
Atlanta, GA [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	146,168	143,741	143,904
Rental property and other expenses	57,453	54,041	51,607
Total net operating income	88,715	89,700	92,297
Reconciliation to net income:
Total assets	958,101	907,421
Charlotte, NC [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	88,003	85,984	73,721
Rental property and other expenses	24,419	22,063	18,032
Total net operating income	63,584	63,921	55,689
Reconciliation to net income:
Total assets	950,068	974,846
Nashville, TN [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	169,158	171,797	174,341
Rental property and other expenses	45,143	46,380	45,124
Total net operating income	124,015	125,417	129,217
Reconciliation to net income:
Total assets	1,231,940	1,259,272
Orlando, FL [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	58,442	58,002	54,802
Rental property and other expenses	23,094	22,840	22,471
Total net operating income	35,348	35,162	32,331
Reconciliation to net income:
Total assets	276,070	286,781
Raleigh, NC [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	173,156	181,964	182,990
Rental property and other expenses	47,046	49,702	48,086
Total net operating income	126,110	132,262	134,904
Reconciliation to net income:
Total assets	1,182,217	1,255,978
Richmond, VA [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	35,265	35,918	43,084
Rental property and other expenses	11,140	11,162	14,205
Total net operating income	24,125	24,756	28,879
Reconciliation to net income:
Total assets	157,431	157,299
Tampa, FL [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	98,887	99,421	94,726
Rental property and other expenses	37,603	37,039	35,035
Total net operating income	61,284	62,382	59,691
Reconciliation to net income:
Total assets	463,884	473,800
Other Segment [Member]
Segment Reporting Information [Abstract]
Rental and other revenues	56,783	57,170	61,361
Rental property and other expenses	26,275	25,555	25,246
Total net operating income	30,508	31,615	$ 36,115
Reconciliation to net income:
Total assets	$ 809,644	$ 687,531