Business Acquisition Narratives (Details) - USD ($) $ in Thousands			3 Months Ended				6 Months Ended	9 Months Ended
		Feb. 29, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Oct. 02, 2015	Jul. 01, 2016	Sep. 30, 2016	Oct. 02, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Contingent Consideration, Liability, Current			$ 0					$ 0
Goodwill			239,880					239,880		$ 197,781
Indefinite-lived Intangible Assets Acquired							$ 1,100
Gross Profit			51,363			$ 46,231		143,057	$ 155,644
Goodwill, Acquired During Period								41,670
TVN [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Contingent Consideration, Liability, Current					$ 8,000
Business Combination, Consideration Transferred		$ 84,600		$ 82,500				82,512
Contingent consideration for TVN acquisition not yet paid			0					0
Purchase Consideration Remain in Escrow			$ 13,500					13,500
Purchase Consideration Escrow Period			18 months
Goodwill			$ 41,670					41,670
Revenues			19,000					40,200
Gross Profit			7,600					14,700
Goodwill, Acquired During Period					$ 39,200
Business Combination, Acquisition Related Costs			534					3,855
Business Combination, Acquisition and Integration Related Expenses			5,300					11,800
In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	[1]		$ 0					0
Developed Technology | TVN [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired				1,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			4 years				4 years
Maximum [Member] | In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Expected Project Completion Period							6 months
Fair Value Adjustment To Deferred Revenue [Member]
Business Acquisition [Line Items]
Revenues			$ 800					$ 2,500
TVN's 2015 backlog [Member] | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				$ 2,100
TVN's 2015 backlog [Member] | Maximum [Member] | TVN [Member]
Business Acquisition [Line Items]
Contingent consideration for TVN acquisition not yet paid		$ 5,000

[1] By the end of the second quarter of 2016, the Company completed the TVN in-process research and development activities and as a result, the in-process research and development of $1.1 million was reclassified to developed technology.