Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income Before Income Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total net revenue		$ 280,052	$ 230,852	$ 510,015	$ 479,934
Total segment contribution income		40,472	25,624	67,626	67,428
Corporate and unallocated costs		(19,489)	(15,576)	(38,451)	(34,708)
Amortization of intangibles	[1]	(1,519)	(1,682)	(3,038)	(3,692)
Stock-based compensation expense		(9,172)	(6,739)	(15,508)	(13,197)
Separation expense		0	0	0	(264)
Change in fair value of contingent consideration		(311)	0	(89)	0
Restructuring and other charges		(1,117)	(1,291)	(982)	(1,223)
Litigation reserves, net		3	(10)	(22)	(10)
Interest income		49	782	311	1,483
Other income (expense), net		314	487	(4,272)	828
Total before tax		9,230	1,595	5,575	16,645
Connected Home
Segment Reporting Information [Line Items]
Total net revenue		230,017	167,495	394,680	336,860
Total segment contribution income		$ 36,187	$ 14,204	$ 49,774	$ 33,323
Segment contribution margin		15.70%	8.50%	12.60%	9.90%
SMB
Segment Reporting Information [Line Items]
Total net revenue		$ 50,035	$ 63,357	$ 115,335	$ 143,074
Total segment contribution income		$ 4,285	$ 11,420	$ 17,852	$ 34,105
Segment contribution margin		8.60%	18.00%	15.50%	23.80%

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