CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Income Statement [Abstract]
Revenues	$ 146,518	$ 126,158
Costs of services (exclusive of depreciation and amortization)	105,374	90,997
Selling, general and administrative expenses	23,206	24,123
Depreciation and amortization	3,301	2,943
Income from operations	14,637	8,095
Interest expense, net	(199)	(362)
Foreign currency gains (losses), net	(551)	1,422
Income before provision for income taxes	13,887	9,155
Provision for income taxes	3,386	2,687
Net income	$ 10,501	$ 6,468
Net income per share:
Basic (in dollars per share)	$ 1.37	$ 0.83
Diluted (in dollars per share)	$ 1.34	$ 0.80
Weighted average number of shares outstanding:
Basic (in shares)	7,626	7,805
Diluted (in shares)	7,831	8,037