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Stockholders' Equity (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net revenue $ 249,082 $ 245,201
Cost of revenue 167,074 168,882
Research and development 18,832 21,191
Sales and marketing 35,855 37,874
General and administrative 13,117 15,761
Income before income taxes 15,050 932
Tax impact from continuing operations (2,207) 86
Net income from continuing operations 12,843 1,018
Net income from discontinued operations, net of tax 0 4,572
Net income 12,843 5,590
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 414 (1,702)
Cost of revenue (2) 6
Research and development (26) 99
Sales and marketing (69) 230
General and administrative (11) 41
Income before income taxes 306 (1,326)
Tax impact from continuing operations (64) 278
Net income from continuing operations 242 (1,048)
Net income from discontinued operations, net of tax 0 (684)
Net income $ 242 $ (1,732)