Stockholders' Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	$ 229,963	$ 249,082
Cost of revenue	163,722	167,074
Research and development	19,739	18,832
Sales and marketing	33,031	35,855
General and administrative	13,134	13,117
Total before tax	(3,655)	15,050
Tax impact	(518)	(2,207)
Net income (loss)	(4,173)	12,843
Amount Reclassified from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	676	414
Cost of revenue	(2)	(2)
Research and development	(2)	(26)
Sales and marketing	(77)	(69)
General and administrative	(13)	(11)
Total before tax	582	306
Tax impact	(122)	(64)
Net income (loss)	$ 460	$ 242