Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income (Loss) Before Income Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total net revenue		$ 229,963	$ 249,082
Total segment contribution income		27,154	41,804
Corporate and unallocated costs		(18,962)	(19,132)
Amortization of intangibles	[1]	(1,519)	(2,010)
Stock-based compensation expense		(6,336)	(6,458)
Separation expense		0	(264)
Change in fair value of contingent consideration		222	0
Restructuring and other charges		135	68
Litigation reserves, net		(25)	0
Interest income, net		262	701
Other income (expense), net		(4,586)	341
Total before tax		(3,655)	15,050
Connected Home
Segment Reporting Information [Line Items]
Total net revenue		164,663	169,365
Total segment contribution income		$ 13,587	$ 19,119
Segment contribution margin		8.30%	11.30%
SMB
Segment Reporting Information [Line Items]
Total net revenue		$ 65,300	$ 79,717
Total segment contribution income		$ 13,567	$ 22,685
Segment contribution margin		20.80%	28.50%

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