Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Revenues:
Revenues before reimbursements	$ 93,499	$ 95,506	$ 281,082	$ 289,170
Reimbursements	5,164	6,042	15,579	17,915
Revenues	98,663	101,548	296,661	307,085
Operating expenses:
Compensation and related expenses	62,419	58,526	180,541	185,616
Other operating expenses	7,839	8,345	23,736	24,448
Reimbursable expenses	5,164	6,042	15,579	17,915
General and administrative expenses	2,834	5,451	11,290	15,345
Total operating expenses	78,256	78,364	231,146	243,324
Operating income	20,407	23,184	65,515	63,761
Other income, net:
Interest income, net	316	915	1,496	2,894
Miscellaneous income, net	3,915	1,112	3,096	10,729
Total other income, net	4,231	2,027	4,592	13,623
Income before income taxes	24,638	25,211	70,107	77,384
Income taxes	6,554	5,578	9,395	14,045
Net income	$ 18,084	$ 19,633	$ 60,712	$ 63,339
Net income per share:
Basic (in dollars per share)	$ 0.35	$ 0.37	$ 1.16	$ 1.20
Diluted (in dollars per share)	$ 0.34	$ 0.36	$ 1.14	$ 1.17
Shares used in per share computations:
Basic (in shares)	52,316	52,802	52,383	52,694
Diluted (in shares)	53,209	54,002	53,342	53,906
Cash dividends declared per common share (in dollars per share)	$ 0.19	$ 0.16	$ 0.57	$ 0.48