Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Revenues:
Revenues before reimbursements	$ 100,263	$ 89,972	$ 193,664	$ 180,656
Reimbursements	6,243	5,649	11,873	11,422
Revenues	106,506	95,621	205,537	192,078
Operating expenses:
Compensation and related expenses	61,997	55,458	127,090	113,037
Other operating expenses	8,095	7,566	16,103	15,031
Reimbursable expenses	6,243	5,649	11,873	11,422
General and administrative expenses	5,348	4,470	9,894	8,512
Total operating expenses	81,683	73,143	164,960	148,002
Operating income	24,823	22,478	40,577	44,076
Other income, net:
Interest income, net	924	543	1,979	1,073
Miscellaneous income, net	3,104	1,898	9,617	2,220
Total other income, net	4,028	2,441	11,596	3,293
Income before income taxes	28,851	24,919	52,173	47,369
Income taxes	7,857	6,494	8,467	8,604
Net income	$ 20,994	$ 18,425	$ 43,706	$ 38,765
Net income per share:
Basic (in dollars per share)	$ 0.40	$ 0.35	$ 0.83	$ 0.73
Diluted (in dollars per share)	$ 0.39	$ 0.34	$ 0.81	$ 0.72
Shares used in per share computations:
Basic (in shares)	52,745	53,008	52,641	52,876
Diluted (in shares)	53,872	54,195	53,849	54,111
Cash dividends declared per common share (in dollars per share)	$ 0.16	$ 0.13	$ 0.32	$ 0.26