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, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total net revenue	$ 252,971	$ 265,858	$ 230,852	$ 249,082	$ 288,928	$ 269,411	$ 255,276	$ 245,201	$ 998,763	$ 1,058,816	$ 1,039,169
Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									133,317	160,295	193,454
Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									865,446	898,521	845,715
Americas
Disaggregation of Revenue [Line Items]
Total net revenue									653,006	700,693	665,089
EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									200,099	207,599	197,074
APAC
Disaggregation of Revenue [Line Items]
Total net revenue									145,658	150,524	177,006
Connected Home
Disaggregation of Revenue [Line Items]
Total net revenue									711,391	771,060	768,261
Connected Home | Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									128,852	156,671	190,186
Connected Home | Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									582,539	614,389	578,075
Connected Home | Americas
Disaggregation of Revenue [Line Items]
Total net revenue									529,982	576,476	547,314
Connected Home | EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									91,586	97,979	93,438
Connected Home | APAC
Disaggregation of Revenue [Line Items]
Total net revenue									89,823	96,605	127,509
SMB
Disaggregation of Revenue [Line Items]
Total net revenue									287,372	287,756	270,908
SMB | Service provider
Disaggregation of Revenue [Line Items]
Total net revenue									4,465	3,624	3,268
SMB | Non-service provider
Disaggregation of Revenue [Line Items]
Total net revenue									282,907	284,132	267,640
SMB | Americas
Disaggregation of Revenue [Line Items]
Total net revenue									123,024	124,217	117,775
SMB | EMEA
Disaggregation of Revenue [Line Items]
Total net revenue									108,513	109,620	103,636
SMB | APAC
Disaggregation of Revenue [Line Items]
Total net revenue									$ 55,835	$ 53,919	$ 49,497