Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net service revenues	$ 1,058,651	$ 951,120	$ 864,499
Cost of service revenues	718,775	651,381	594,651
Gross profit	339,876	299,739	269,848
General and administrative expenses	234,794	216,942	189,418
Depreciation and amortization	14,126	14,060	14,494
Total operating expenses	248,920	231,002	203,912
Operating income	90,956	68,737	65,936
Interest income	(1,476)	(341)	(268)
Interest expense	11,106	8,907	5,806
Total interest expense, net	9,630	8,566	5,538
Income before income taxes	81,326	60,171	60,398
Income tax expense	18,810	14,146	15,272
Net income	$ 62,516	$ 46,025	$ 45,126
Net income per common share
Basic net income per share	$ 3.91	$ 2.90	$ 2.87
Diluted net income per share	$ 3.83	$ 2.84	$ 2.81
Weighted average number of common shares and potential common shares outstanding:
Basic	15,996	15,861	15,737
Diluted	16,311	16,181	16,064