Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Revenues:
Revenues before reimbursements	$ 74,264	$ 70,096	$ 219,562	$ 211,007
Reimbursements	4,293	5,135	11,531	12,389
Revenues	78,557	75,231	231,093	223,396
Operating expenses:
Compensation and related expenses	43,948	44,801	138,855	137,795
Other operating expenses	6,715	6,440	19,482	18,794
Reimbursable expenses	4,293	5,135	11,531	12,389
General and administrative expenses	4,363	3,695	11,809	10,814
Total operating expenses	59,319	60,071	181,677	179,792
Operating income	19,238	15,160	49,416	43,604
Other income (expense), net:
Interest income, net	33	14	117	95
Miscellaneous income (expense), net	(896)	2,341	2,605	5,592
Total other income (expense), net	(863)	2,355	2,722	5,687
Income before income taxes	18,375	17,515	52,138	49,291
Income taxes	7,335	6,421	20,680	19,373
Net income	$ 11,040	$ 11,094	$ 31,458	$ 29,918
Net income per share:
Basic	$ 0.82	$ 0.82	$ 2.33	$ 2.19
Diluted	$ 0.80	$ 0.79	$ 2.26	$ 2.13
Shares used in per share computations:
Basic	13,469	13,598	13,509	13,638
Diluted	13,824	13,993	13,889	14,047
Cash dividends declared per common share	$ 0.25	$ 0.15	$ 0.75	$ 0.45