Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income Before Income Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Segment Reporting Information [Line Items]
Total net revenue		$ 378,114	$ 265,858	$ 888,129	$ 745,792
Total segment contribution income		64,685	37,684	132,311	105,112
Corporate and unallocated costs		(23,293)	(16,901)	(61,744)	(51,609)
Amortization of intangibles	[1]	(1,470)	(1,520)	(4,508)	(5,212)
Stock-based compensation expense		(7,218)	(6,986)	(22,726)	(20,183)
Separation expense		0	0	0	(264)
Change in fair value of contingent consideration		(187)	(199)	(276)	(199)
Restructuring and other charges		(329)	77	(1,311)	(1,146)
Litigation reserves, net		(22)	(90)	(44)	(100)
Interest income		98	639	409	2,122
Other income (expense), net		(515)	(403)	(4,787)	425
Total before tax		31,749	12,301	37,324	28,946
Connected Home
Segment Reporting Information [Line Items]
Total net revenue		316,739	190,672	711,419	527,532
Total segment contribution income		$ 55,964	$ 18,934	$ 105,738	$ 52,257
Segment contribution margin		17.70%	9.90%	14.90%	9.90%
SMB
Segment Reporting Information [Line Items]
Total net revenue		$ 61,375	$ 75,186	$ 176,710	$ 218,260
Total segment contribution income		$ 8,721	$ 18,750	$ 26,573	$ 52,855
Segment contribution margin		14.20%	24.90%	15.00%	24.20%

[1] Amount excludes amortization expense related to patents within purchased intangibles in cost of revenue.