Condensed Consolidated Statements of Comprehensive Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 7,756	$ 4,001	$ 4,806	$ 2,406
OTHER COMPREHENSIVE INCOME (LOSS):
Unrealized holding gains (losses) on available-for-sale securities	20	3	32	(1)
Foreign currency translation adjustment	(17)	6	(37)	25
OTHER COMPREHENSIVE INCOME (LOSS), NET	3	9	(5)	24
TOTAL COMPREHENSIVE INCOME	$ 7,759	$ 4,010	$ 4,801	$ 2,430