Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	$ 204,323	$ 207,095	$ 620,336	$ 627,138
Total Net Operating Income	138,617	139,902	419,636	427,907
Reconciliation to net income:
Depreciation and amortization	(79,116)	(74,765)	(226,532)	(220,416)
General and administrative expenses	(9,898)	(8,873)	(31,754)	(30,668)
Interest expense	(37,472)	(34,247)	(109,928)	(101,408)
Other income	1,872	754	10,559	3,082
Gains on disposition of property	350	0	42,581	19,818
Gain on deconsolidation of affiliate	0	0	0	11,778
Equity in earnings of unconsolidated affiliates	1,116	400	2,890	1,902
Net income	15,469	23,171	107,452	111,995
Office Atlanta, GA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	36,742	35,666	109,799	107,991
Total Net Operating Income	22,268	21,796	67,950	68,289
Office Charlotte, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	22,010	21,079	65,991	63,452
Total Net Operating Income	15,936	16,388	47,974	47,719
Office Nashville, TN [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	40,903	42,884	126,458	130,084
Total Net Operating Income	30,657	31,389	92,448	95,530
Office Orlando, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,312	14,356	43,892	43,300
Total Net Operating Income	8,850	8,734	26,840	26,358
Office Raleigh, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	43,042	45,354	130,848	136,933
Total Net Operating Income	31,692	32,523	95,537	99,799
Office Richmond, VA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	8,754	8,746	26,816	27,103
Total Net Operating Income	5,765	5,733	18,424	18,656
Office Tampa, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	23,948	25,000	72,963	75,344
Total Net Operating Income	15,309	15,574	46,131	47,614
Other [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,612	14,010	43,569	42,931
Total Net Operating Income	$ 8,140	$ 7,765	$ 24,332	$ 23,942