Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Revenues:
Revenues before reimbursements	$ 137,207	$ 128,705
Reimbursements	7,726	11,604
Revenues	144,933	140,309
Operating expenses:
Compensation and related expenses	90,327	84,181
Other operating expenses	10,531	9,561
Reimbursable expenses	7,726	11,604
General and administrative expenses	5,636	5,843
Total operating expenses	114,220	111,189
Operating income	30,713	29,120
Other income, net:
Interest income, net	2,626	1,770
Miscellaneous income (loss), net	7,084	4,648
Total other income (loss), net	9,710	6,418
Income before income taxes	40,423	35,538
Income taxes	10,281	6,414
Net income	$ 30,142	$ 29,124
Net income per share:
Basic (in dollars per share)	$ 0.59	$ 0.57
Diluted (in dollars per share)	$ 0.59	$ 0.56
Shares used in per share computations:
Basic (in shares)	51,006	51,132
Diluted (in shares)	51,419	51,682
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.26