Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 2,581	$ 1,916	$ 8,886	$ 4,381
Other comprehensive income (loss)
Changes in foreign currency translation adjustments	492	133	(1,042)	(483)
Other comprehensive income (loss)	492	133	(1,042)	(483)
Comprehensive income	$ 3,073	$ 2,049	$ 7,844	$ 3,898