Business Acquisition Narratives (Details) - USD ($)			3 Months Ended			6 Months Ended
		Feb. 29, 2016	Jul. 01, 2016	Apr. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			100.00%			100.00%
Business Combination, Contingent Consideration, Liability, Current	[1]		$ 2,483,000			$ 2,483,000
Goodwill			235,369,000			235,369,000		$ 197,781,000
Indefinite-lived Intangible Assets Acquired			1,000,000
Gross Profit			51,040,000		$ 54,385,000	91,694,000	$ 109,413,000
Goodwill, Acquired During Period						37,630,000
Business Combination, Acquisition and Integration Related Expenses			3,400,000			6,500,000
TVN [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Contingent Consideration, Liability, Current				$ 8,000,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			5,500,000
Business Combination, Consideration Transferred		$ 84,600,000	82,546,000
Purchase Consideration Remain in Escrow			$ 13,500,000			13,500,000
Purchase Consideration Escrow Period			18 months
Goodwill			$ 37,630,000			37,630,000
Revenues			18,300,000			21,200,000
Gross Profit			6,900,000			7,100,000
Goodwill, Acquired During Period				$ 39,200,000
Business Combination, Acquisition Related Costs			885,000			3,321,000
In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	[2]		$ 0			0
Developed Technology | TVN [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			4 years
Maximum [Member] | In Process Research and Development | TVN [Member]
Business Acquisition [Line Items]
Project Completion Period			6 months
Fair Value Adjustment To Deferred Revenue [Member]
Business Acquisition [Line Items]
Revenues					$ 5,700,000		$ 8,100,000
TVN's 2015 backlog [Member] | TVN [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ 2,100,000
Contingent consideration for TVN acquisition not yet paid			$ 2,500,000			$ 2,500,000
TVN's 2015 backlog [Member] | Maximum [Member] | TVN [Member]
Business Acquisition [Line Items]
Contingent consideration for TVN acquisition not yet paid		$ 5,000,000

[1] The TVN acquisition is subject to post-closing adjustments as set forth in the TVN Purchase Agreement to be determined within 90 days from the acquisition date in amounts capped to (i) the difference between €76 million (approximately $83.3 million as converted from euros into U.S. dollars using an agreed upon average exchange rate) and $75 million, with respect to an adjustment based on TVN’s 2015 revenue, and (ii) up to $5 million with respect to an adjustment based on TVN’s 2015 backlog that ships during the first half of 2016. During the second quarter of 2016, the Company paid $3.5 million upon the finalization of the revenue and working capital adjustments. The remaining backlog adjustment amount has been finalized at $2.5 million and will be paid in the third quarter of 2016.

[2] 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 $1.0 million was reclassified to developed technology.