Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	$ 211,275	$ 212,752
Total Net Operating Income	140,840	147,021
Reconciliation to net income:
Depreciation and amortization	(73,671)	(70,633)
General and administrative expenses	(12,499)	(12,415)
Interest expense	(36,552)	(33,098)
Other income	1,232	1,147
Gains on disposition of property	7,209	450
Gain on deconsolidation of affiliate	0	11,778
Equity in earnings of unconsolidated affiliates	654	704
Net income	27,213	44,954
Total Office Segment [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	196,732	197,986
Total Net Operating Income	132,913	138,712
Office Atlanta, GA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	36,443	36,870
Total Net Operating Income	22,620	24,225
Office Charlotte, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	21,717	21,580
Total Net Operating Income	15,928	16,110
Office Nashville, TN [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	45,038	44,564
Total Net Operating Income	31,306	33,025
Office Orlando, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,776	14,394
Total Net Operating Income	9,168	8,772
Office Raleigh, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	45,178	45,878
Total Net Operating Income	32,086	33,606
Office Richmond, VA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	9,001	9,309
Total Net Operating Income	6,317	6,570
Office Tampa, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	24,579	25,391
Total Net Operating Income	15,488	16,404
Other [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,543	14,766
Total Net Operating Income	$ 7,927	$ 8,309