Reportable Segments - Net Operating Income (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]
Net Operating Income	$ 134,884	$ 129,400	$ 396,864	$ 372,058
Office
Segment Reporting Information [Line Items]
Net Operating Income	133,418	127,304	392,519	366,289
Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	1,466	2,096	4,345	5,769
Atlanta
Segment Reporting Information [Line Items]
Net Operating Income	49,122	46,958	145,434	138,122
Atlanta | Office
Segment Reporting Information [Line Items]
Net Operating Income	48,806	46,678	144,564	137,357
Atlanta | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	316	280	870	765
Austin
Segment Reporting Information [Line Items]
Net Operating Income	43,376	39,564	126,179	112,496
Austin | Office
Segment Reporting Information [Line Items]
Net Operating Income	43,376	39,564	126,179	112,496
Austin | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0	0	0
Charlotte
Segment Reporting Information [Line Items]
Net Operating Income	12,097	11,522	35,948	33,394
Charlotte | Office
Segment Reporting Information [Line Items]
Net Operating Income	10,947	10,587	32,473	30,845
Charlotte | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	1,150	935	3,475	2,549
Dallas
Segment Reporting Information [Line Items]
Net Operating Income	3,235	3,197	9,678	9,696
Dallas | Office
Segment Reporting Information [Line Items]
Net Operating Income	3,235	3,197	9,678	9,696
Dallas | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0	0	0
Phoenix
Segment Reporting Information [Line Items]
Net Operating Income	11,950	11,145	33,973	29,988
Phoenix | Office
Segment Reporting Information [Line Items]
Net Operating Income	11,950	11,145	33,973	29,988
Phoenix | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0	0	0
Tampa
Segment Reporting Information [Line Items]
Net Operating Income	11,444	11,254	34,816	32,588
Tampa | Office
Segment Reporting Information [Line Items]
Net Operating Income	11,444	11,254	34,816	32,588
Tampa | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0	0	0
Other markets
Segment Reporting Information [Line Items]
Net Operating Income	3,660	5,760	10,836	15,774
Other markets | Office
Segment Reporting Information [Line Items]
Net Operating Income	3,660	4,879	10,836	13,319
Other markets | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	$ 0	$ 881	$ 0	$ 2,455