Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Revenues:
Revenues before reimbursements	$ 74,160	$ 74,503	$ 226,444	$ 225,916
Reimbursements	3,452	4,491	11,619	13,235
Revenues	77,612	78,994	238,063	239,151
Operating expenses:
Compensation and related expenses	47,797	42,853	146,854	139,745
Other operating expenses	7,020	6,766	21,221	19,979
Reimbursable expenses	3,452	4,491	11,619	13,235
General and administrative expenses	3,748	3,963	11,407	11,538
Total operating expenses	62,017	58,073	191,101	184,497
Operating income	15,595	20,921	46,962	54,654
Other income (expense), net:
Interest income (expense), net	179	47	489	115
Miscellaneous income (expense), net	2,146	(2,195)	4,880	367
Total other income (expense), net	2,325	(2,148)	5,369	482
Income before income taxes	17,920	18,773	52,331	55,136
Income taxes	6,631	7,054	15,239	21,387
Net income	$ 11,289	$ 11,719	$ 37,092	$ 33,749
Net income per share:
Basic	$ 0.43	$ 0.44	$ 1.4	$ 1.27
Diluted	$ 0.42	$ 0.43	$ 1.36	$ 1.23
Shares used in per share computations:
Basic	26,545	26,597	26,563	26,644
Diluted	27,185	27,268	27,234	27,350
Cash dividends declared per common share	$ 0.18	$ 0.15	$ 0.54	$ 0.45