Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	$ 204,738	$ 207,291	$ 416,013	$ 420,043
Total Net Operating Income	140,179	140,984	281,019	288,005
Reconciliation to net income:
Depreciation and amortization	(73,745)	(75,018)	(147,416)	(145,651)
General and administrative expenses	(9,357)	(9,380)	(21,856)	(21,795)
Interest expense	(35,904)	(34,063)	(72,456)	(67,161)
Other income	7,455	1,181	8,687	2,328
Gains on disposition of property	35,022	19,368	42,231	19,818
Gain on deconsolidation of affiliate	0	0	0	11,778
Equity in earnings of unconsolidated affiliates	1,120	798	1,774	1,502
Net income	64,770	43,870	91,983	88,824
Total Office Segment [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	190,324	193,136	387,056	391,122
Total Net Operating Income	131,914	133,116	264,827	271,828
Office Atlanta, GA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	36,614	35,455	73,057	72,325
Total Net Operating Income	23,062	22,268	45,682	46,493
Office Charlotte, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	22,264	20,793	43,981	42,373
Total Net Operating Income	16,110	15,221	32,038	31,331
Office Nashville, TN [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	40,517	42,636	85,555	87,200
Total Net Operating Income	30,485	31,116	61,791	64,141
Office Orlando, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,804	14,550	29,580	28,944
Total Net Operating Income	8,822	8,852	17,990	17,624
Office Raleigh, NC [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	42,628	45,701	87,806	91,579
Total Net Operating Income	31,759	33,670	63,845	67,276
Office Richmond, VA [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	9,061	9,048	18,062	18,357
Total Net Operating Income	6,342	6,353	12,659	12,923
Office Tampa, FL [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	24,436	24,953	49,015	50,344
Total Net Operating Income	15,334	15,636	30,822	32,040
Other [Member]
Segment Reporting Information [Line Items]
Total Rental and Other Revenues	14,414	14,155	28,957	28,921
Total Net Operating Income	$ 8,265	$ 7,868	$ 16,192	$ 16,177