Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021
Revenues:
Revenues before reimbursements	$ 115,143	$ 108,467	$ 351,231	$ 330,514
Reimbursements	12,036	7,938	34,707	22,249
Revenues	127,179	116,405	385,938	352,763
Operating expenses:
Compensation and related expenses	62,779	64,138	189,982	210,491
Other operating expenses	8,822	8,017	25,742	23,848
Reimbursable expenses	12,036	7,938	34,707	22,249
General and administrative expenses	6,729	4,193	16,700	10,626
Total operating expenses	90,366	84,286	267,131	267,214
Operating income	36,813	32,119	118,807	85,549
Other income, net:
Interest income, net	638	13	834	54
Miscellaneous income (expense), net	(3,975)	257	(17,926)	11,579
Total other income, net	(3,337)	270	(17,092)	11,633
Income before income taxes	33,476	32,389	101,715	97,182
Income taxes	9,034	7,815	21,909	16,360
Net income	$ 24,442	$ 24,574	$ 79,806	$ 80,822
Net income per share:
Basic (in dollars per share)	$ 0.47	$ 0.47	$ 1.54	$ 1.54
Diluted (in dollars per share)	$ 0.47	$ 0.46	$ 1.52	$ 1.52
Shares used in per share computations:
Basic (in shares)	51,492	52,618	51,934	52,597
Diluted (in shares)	52,008	53,312	52,489	53,316
Cash dividends declared per common share (in dollars per share)	$ 0.24	$ 0.20	$ 0.72	$ 0.60