Reportable Segments - Net Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Net Operating Income	$ 130,136	$ 119,607
Office
Segment Reporting Information [Line Items]
Net Operating Income	128,704	117,820
Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	1,432	1,787
Atlanta
Segment Reporting Information [Line Items]
Net Operating Income	47,659	44,408
Atlanta | Office
Segment Reporting Information [Line Items]
Net Operating Income	47,389	44,173
Atlanta | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	270	235
Austin
Segment Reporting Information [Line Items]
Net Operating Income	40,273	36,367
Austin | Office
Segment Reporting Information [Line Items]
Net Operating Income	40,273	36,367
Austin | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0
Charlotte
Segment Reporting Information [Line Items]
Net Operating Income	11,924	10,654
Charlotte | Office
Segment Reporting Information [Line Items]
Net Operating Income	10,762	10,011
Charlotte | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	1,162	643
Dallas
Segment Reporting Information [Line Items]
Net Operating Income	3,225	3,308
Dallas | Office
Segment Reporting Information [Line Items]
Net Operating Income	3,225	3,308
Dallas | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0
Phoenix
Segment Reporting Information [Line Items]
Net Operating Income	11,773	8,975
Phoenix | Office
Segment Reporting Information [Line Items]
Net Operating Income	11,773	8,975
Phoenix | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0
Tampa
Segment Reporting Information [Line Items]
Net Operating Income	11,711	10,691
Tampa | Office
Segment Reporting Information [Line Items]
Net Operating Income	11,711	10,691
Tampa | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	0	0
Other markets
Segment Reporting Information [Line Items]
Net Operating Income	3,571	5,204
Other markets | Office
Segment Reporting Information [Line Items]
Net Operating Income	3,571	4,295
Other markets | Non-Office
Segment Reporting Information [Line Items]
Net Operating Income	$ 0	$ 909