Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Revenues:
Revenues before reimbursements	$ 112,468	$ 87,863	$ 222,047	$ 187,583
Reimbursements	7,409	4,182	14,311	10,415
Revenues	119,877	92,045	236,358	197,998
Operating expenses:
Compensation and related expenses	71,815	68,137	146,353	118,122
Other operating expenses	8,121	7,681	15,831	15,897
Reimbursable expenses	7,409	4,182	14,311	10,415
General and administrative expenses	3,160	2,925	6,433	8,456
Total operating expenses	90,505	82,925	182,928	152,890
Operating income	29,372	9,120	53,430	45,108
Other income, net:
Interest income, net	12	305	41	1,180
Miscellaneous income (expense), net	5,283	11,989	11,322	(819)
Total other income, net	5,295	12,294	11,363	361
Income before income taxes	34,667	21,414	64,793	45,469
Income taxes	9,267	5,068	8,545	2,841
Net income	$ 25,400	$ 16,346	$ 56,248	$ 42,628
Net income per share:
Basic (in dollars per share)	$ 0.48	$ 0.31	$ 1.07	$ 0.81
Diluted (in dollars per share)	$ 0.48	$ 0.31	$ 1.06	$ 0.80
Shares used in per share computations:
Basic (in shares)	52,637	52,259	52,587	52,417
Diluted (in shares)	53,285	53,139	53,313	53,404
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.19	$ 0.40	$ 0.38