Reportable Segments - Segment Net Operating Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total Net Operating Income	$ 531,094	$ 502,200	$ 493,720
Atlanta
Segment Reporting Information [Line Items]
Total Net Operating Income	194,287	185,649	177,415
Austin
Segment Reporting Information [Line Items]
Total Net Operating Income	170,103	152,806	146,923
Charlotte
Segment Reporting Information [Line Items]
Total Net Operating Income	47,867	44,836	54,645
Dallas
Segment Reporting Information [Line Items]
Total Net Operating Income	13,074	12,890	14,014
Phoenix
Segment Reporting Information [Line Items]
Total Net Operating Income	44,177	41,544	38,305
Tampa
Segment Reporting Information [Line Items]
Total Net Operating Income	46,933	45,187	36,244
Other markets
Segment Reporting Information [Line Items]
Total Net Operating Income	14,653	19,288	26,174
Office
Segment Reporting Information [Line Items]
Total Net Operating Income	525,369	495,149	488,364
Office | Atlanta
Segment Reporting Information [Line Items]
Total Net Operating Income	193,305	184,609	176,793
Office | Austin
Segment Reporting Information [Line Items]
Total Net Operating Income	170,103	152,806	146,923
Office | Charlotte
Segment Reporting Information [Line Items]
Total Net Operating Income	43,124	41,234	53,294
Office | Dallas
Segment Reporting Information [Line Items]
Total Net Operating Income	13,074	12,890	14,014
Office | Phoenix
Segment Reporting Information [Line Items]
Total Net Operating Income	44,177	41,544	36,244
Office | Tampa
Segment Reporting Information [Line Items]
Total Net Operating Income	46,933	45,187	38,305
Office | Other markets
Segment Reporting Information [Line Items]
Total Net Operating Income	14,653	16,879	22,791
Non-Office
Segment Reporting Information [Line Items]
Total Net Operating Income	5,725	7,051	5,356
Non-Office | Atlanta
Segment Reporting Information [Line Items]
Total Net Operating Income	982	1,040	622
Non-Office | Austin
Segment Reporting Information [Line Items]
Total Net Operating Income	0	0	0
Non-Office | Charlotte
Segment Reporting Information [Line Items]
Total Net Operating Income	4,743	3,602	1,351
Non-Office | Dallas
Segment Reporting Information [Line Items]
Total Net Operating Income	0	0	0
Non-Office | Phoenix
Segment Reporting Information [Line Items]
Total Net Operating Income	0	0	0
Non-Office | Tampa
Segment Reporting Information [Line Items]
Total Net Operating Income	0	0	0
Non-Office | Other markets
Segment Reporting Information [Line Items]
Total Net Operating Income	$ 0	$ 2,409	$ 3,383