Revenue Recognition (Schedule of Net Revenue Disaggregated by Geographical Region and Sales Channel) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total net revenue	$ 367,073	$ 378,114	$ 280,052	$ 229,963	$ 252,971	$ 265,858	$ 230,852	$ 249,082	$ 1,255,202	$ 998,763	$ 1,058,816
Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									195,864	133,317	160,295
Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									1,059,338	865,446	898,521
Americas
Disaggregation of Revenue [Line Items]
Total net revenue									897,971	653,006	700,693
EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									221,665	200,099	207,599
APAC
Disaggregation of Revenue [Line Items]
Total net revenue									135,566	145,658	150,524
Connected Home
Disaggregation of Revenue [Line Items]
Total net revenue									1,007,545	711,391	771,060
Connected Home | Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									192,714	128,852	156,671
Connected Home | Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									814,831	582,539	614,389
Connected Home | Americas
Disaggregation of Revenue [Line Items]
Total net revenue									788,402	529,982	576,476
Connected Home | EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									129,929	91,586	97,979
Connected Home | APAC
Disaggregation of Revenue [Line Items]
Total net revenue									89,214	89,823	96,605
SMB
Disaggregation of Revenue [Line Items]
Total net revenue									247,657	287,372	287,756
SMB | Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									3,150	4,465	3,624
SMB | Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									244,507	282,907	284,132
SMB | Americas
Disaggregation of Revenue [Line Items]
Total net revenue									109,569	123,024	124,217
SMB | EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									91,736	108,513	109,620
SMB | APAC
Disaggregation of Revenue [Line Items]
Total net revenue									$ 46,352	$ 55,835	$ 53,919