Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Revenues:
Revenues before reimbursements	$ 71,919	$ 68,318	$ 140,911	$ 134,788
Reimbursements	3,586	6,166	7,254	11,621
Revenues	75,505	74,484	148,165	146,409
Operating expenses:
Compensation and related expenses	44,432	41,857	92,994	88,032
Other operating expenses	6,207	5,952	12,354	11,514
Reimbursable expenses	3,586	6,166	7,254	11,621
General and administrative expenses	3,687	3,148	7,119	6,065
Total operating expenses	57,912	57,123	119,721	117,232
Operating income	17,593	17,361	28,444	29,177
Other income (expense), net:
Interest income, net	36	88	81	165
Miscellaneous income (expense), net	642	(201)	3,251	1,639
Total other income (expense), net	678	(113)	3,332	1,804
Income before income taxes	18,271	17,248	31,776	30,981
Income taxes	7,423	6,921	12,952	12,453
Net income	$ 10,848	$ 10,327	$ 18,824	$ 18,528
Net income per share:
Basic	$ 0.80	$ 0.75	$ 1.38	$ 1.34
Diluted	$ 0.77	$ 0.72	$ 1.34	$ 1.29
Shares used in per share computations:
Basic	13,637	13,835	13,658	13,847
Diluted	14,007	14,316	14,068	14,373