Stockholders' Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	$ 280,052	$ 230,852	$ 510,015	$ 479,934
Cost of revenue	198,751	165,407	362,473	332,481
Research and development	21,144	18,814	40,883	37,646
Sales and marketing	34,384	34,541	67,415	70,396
General and administrative	15,481	10,463	28,615	23,580
Total before tax	9,230	1,595	5,575	16,645
Tax impact	(3,247)	(756)	(3,765)	(2,963)
Net income	5,983	839	1,810	13,682
Amount Reclassified from AOCI
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	343	672	1,019	1,086
Cost of revenue	1	(6)	(1)	(8)
Research and development	7	(20)	5	(46)
Sales and marketing	5	(98)	(72)	(167)
General and administrative	(1)	(12)	(14)	(23)
Total before tax	355	536	937	842
Tax impact	(75)	(113)	(197)	(177)
Net income	$ 280	$ 423	$ 740	$ 665