Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 2,019,787	$ 1,963,238	$ 1,779,964
Direct costs	1,282,016	1,265,018	1,134,422
Operating costs and expenses:
Indirect and selling expenses	518,453	505,162	486,863
Depreciation and amortization	20,484	25,277	21,482
Amortization of intangible assets	32,992	35,461	28,435
Total operating costs and expenses	571,929	565,900	536,780
Operating income	165,842	132,320	108,762
Interest, net	(29,590)	(39,681)	(23,281)
Other income (expense)	1,806	3,908	(1,501)
Income before income taxes	138,058	96,547	83,980
Provision for income taxes	27,888	13,935	19,737
Net income	$ 110,170	$ 82,612	$ 64,243
Earnings per share:
Basic	$ 5.88	$ 4.39	$ 3.41
Diluted	$ 5.82	$ 4.35	$ 3.38
Weighted-average common shares outstanding:
Basic	18,747	18,802	18,818
Diluted	18,925	18,994	19,033
Cash dividends declared per common share	$ 0.56	$ 0.56	$ 0.56
Other comprehensive (loss) income, net of tax	$ (3,861)	$ (3,752)	$ 2,902
Comprehensive income, net of tax	$ 106,309	$ 78,860	$ 67,145