Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	$ 212,752	$ 206,378
Total Net Operating Income	147,021	144,956
Reconciliation to net income:
Depreciation and amortization	(70,633)	(69,667)
General and administrative expenses	(12,415)	(13,556)
Interest expense	(33,098)	(24,393)
Other income	1,147	363
Gains on disposition of property	450	4,100
Gain on deconsolidation of affiliate	11,778	0
Equity in earnings of unconsolidated affiliates	704	300
Net income	44,954	42,103
Total Office Segment [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	197,986	190,109
Total Net Operating Income	138,712	135,276
Office Atlanta, GA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	36,870	35,554
Total Net Operating Income	24,225	23,681
Office Charlotte, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	21,580	16,944
Total Net Operating Income	16,110	13,050
Office Nashville, TN [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	44,564	43,447
Total Net Operating Income	33,025	32,522
Office Orlando, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,394	13,312
Total Net Operating Income	8,772	8,137
Office Raleigh, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	45,878	46,296
Total Net Operating Income	33,606	34,715
Office Richmond, VA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	9,309	10,533
Total Net Operating Income	6,570	7,225
Office Tampa, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	25,391	24,023
Total Net Operating Income	16,404	15,946
Other [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,766	16,269
Total Net Operating Income	$ 8,309	$ 9,680