Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 1,779,964	$ 1,553,048	$ 1,506,875
Direct costs	1,134,422	979,570	972,406
Operating costs and expenses
Indirect and selling expenses	486,863	430,572	411,612
Depreciation and amortization	21,482	19,478	20,399
Amortization of intangible assets	28,435	12,492	13,349
Total operating costs and expenses	536,780	462,542	445,360
Operating income	108,762	110,936	89,109
Interest, net	(23,281)	(9,984)	(13,712)
Other expense	(1,501)	(862)	(724)
Income before income taxes	83,980	100,090	74,673
Provision for income taxes	19,737	28,958	19,714
Net income	$ 64,243	$ 71,132	$ 54,959
Earnings per share:
Basic earnings per share	$ 3.41	$ 3.77	$ 2.92
Diluted earnings per share	$ 3.38	$ 3.72	$ 2.87
Weighted-average common shares outstanding:
Basic	18,818	18,868	18,841
Diluted	19,033	19,124	19,135
Cash dividends declared per common share	$ 0.56	$ 0.56	$ 0.56
Other comprehensive income (loss), net of tax	$ 2,902	$ 3,071	$ (1,962)
Comprehensive income, net of tax	$ 67,145	$ 74,203	$ 52,997