Reportable Segments - Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total Revenues	$ 198,848	$ 195,170	$ 605,896	$ 567,748
Rental property revenues
Segment Reporting Information [Line Items]
Total Revenues	198,429	193,455	602,459	559,856
Rental property revenues | Office
Segment Reporting Information [Line Items]
Total Revenues	196,718	192,139	597,206	556,252
Rental property revenues | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	1,711	1,316	5,253	3,604
Operating segments | Rental property revenues
Segment Reporting Information [Line Items]
Total Revenues	200,720	197,849	609,079	572,500
Operating segments | Rental property revenues | Office
Segment Reporting Information [Line Items]
Total Revenues	198,530	194,653	602,421	563,616
Operating segments | Rental property revenues | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	2,190	3,196	6,658	8,884
Operating segments | Rental property revenues | Atlanta
Segment Reporting Information [Line Items]
Total Revenues	76,336	71,169	222,554	208,905
Operating segments | Rental property revenues | Atlanta | Office
Segment Reporting Information [Line Items]
Total Revenues	75,857	70,708	221,149	207,582
Operating segments | Rental property revenues | Atlanta | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	479	461	1,405	1,323
Operating segments | Rental property revenues | Austin
Segment Reporting Information [Line Items]
Total Revenues	62,250	64,522	198,294	184,800
Operating segments | Rental property revenues | Austin | Office
Segment Reporting Information [Line Items]
Total Revenues	62,250	64,522	198,294	184,800
Operating segments | Rental property revenues | Austin | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Operating segments | Rental property revenues | Charlotte
Segment Reporting Information [Line Items]
Total Revenues	16,049	15,659	49,084	45,380
Operating segments | Rental property revenues | Charlotte | Office
Segment Reporting Information [Line Items]
Total Revenues	14,338	14,343	43,831	41,776
Operating segments | Rental property revenues | Charlotte | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	1,711	1,316	5,253	3,604
Operating segments | Rental property revenues | Dallas
Segment Reporting Information [Line Items]
Total Revenues	4,280	4,240	12,692	12,568
Operating segments | Rental property revenues | Dallas | Office
Segment Reporting Information [Line Items]
Total Revenues	4,280	4,240	12,692	12,568
Operating segments | Rental property revenues | Dallas | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Operating segments | Rental property revenues | Phoenix
Segment Reporting Information [Line Items]
Total Revenues	16,339	15,135	50,142	42,098
Operating segments | Rental property revenues | Phoenix | Office
Segment Reporting Information [Line Items]
Total Revenues	16,339	15,135	50,142	42,098
Operating segments | Rental property revenues | Phoenix | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Operating segments | Rental property revenues | Tampa
Segment Reporting Information [Line Items]
Total Revenues	18,797	18,229	56,286	52,369
Operating segments | Rental property revenues | Tampa | Office
Segment Reporting Information [Line Items]
Total Revenues	18,797	18,229	56,286	52,369
Operating segments | Rental property revenues | Tampa | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Operating segments | Rental property revenues | Other markets
Segment Reporting Information [Line Items]
Total Revenues	6,669	8,895	20,027	26,380
Operating segments | Rental property revenues | Other markets | Office
Segment Reporting Information [Line Items]
Total Revenues	6,669	7,476	20,027	22,423
Operating segments | Rental property revenues | Other markets | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	0	1,419	0	3,957
Segment reconciling items | Rental property revenues
Segment Reporting Information [Line Items]
Total Revenues	(2,291)	(4,394)	(6,620)	(12,644)
Segment reconciling items | Rental property revenues | Office
Segment Reporting Information [Line Items]
Total Revenues	(1,812)	(2,514)	(5,215)	(7,364)
Segment reconciling items | Rental property revenues | Non-Office
Segment Reporting Information [Line Items]
Total Revenues	$ (479)	$ (1,880)	$ (1,405)	$ (5,280)