Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Revenues:
Revenues before reimbursements	$ 90,684	$ 80,467
Reimbursements	5,773	3,655
Revenues	96,457	84,122
Operating expenses:
Compensation and related expenses	57,579	54,418
Other operating expenses	7,465	7,191
Reimbursable expenses	5,773	3,655
General and administrative expenses	4,042	4,224
Total operating expenses	74,859	69,488
Operating income	21,598	14,634
Other income, net:
Interest income, net	530	234
Miscellaneous income, net	322	2,542
Total other income, net	852	2,776
Income before income taxes	22,450	17,410
Income taxes	2,110	834
Net income	$ 20,340	$ 16,576
Net income per share:
Basic	$ 0.77	$ 0.63
Diluted	$ 0.75	$ 0.61
Shares used in per share computations:
Basic	26,372	26,302
Diluted	27,006	26,981
Cash dividends declared per common share	$ 0.26	$ 0.21