Business Acquisition Narratives (Details) - USD ($) $ in Thousands		3 Months Ended																6 Months Ended	12 Months Ended
	Feb. 29, 2016	Dec. 31, 2016		Sep. 30, 2016		Jul. 01, 2016		Apr. 01, 2016		Dec. 31, 2015		Oct. 02, 2015	[2]	Jul. 03, 2015	[2]	Apr. 03, 2015	[2],[5]	Jul. 01, 2016	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Goodwill		$ 237,279								$ 197,781									$ 237,279		$ 197,781
Gross profit		57,693	[1],[2],[3],[4]	$ 51,363	[2],[4],[5]	$ 51,040	[2],[4]	$ 40,654	[2],[4],[5]	$ 47,068	[1],[2]	$ 46,231		$ 54,385		$ 55,028			200,750		202,712	$ 212,348
Restructuring Charges																			14,602	[6]	$ 1,372	$ 2,761
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits								4,800
TVN [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Total purchase consideration	$ 84,600					82,500													82,512
Business Combination, Contingent Consideration, Liability, Current								8,000
Purchase Consideration Remain in Escrow		13,500																	$ 13,500
Purchase Consideration Escrow Period																			18 months
Goodwill		41,670																	$ 41,670
Gross profit																			22,000
Revenues																			60,000
Business Combination, Acquisition and Integration Related Expenses		$ 5,200		$ 5,300		3,400		$ 3,000											$ 16,900
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)
Developed Technology Rights [Member] | 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 [Member] | TVN [Member]
Business Acquisition [Line Items]
Expected Project Completion Period																		6 months
Fair Value Adjustment To Deferred Revenue [Member]
Business Acquisition [Line Items]
Increase (Decrease) in Deferred Revenue and Customer Advances and Deposits																			$ 3,800

[1] A history of operating losses in recent years has led to uncertainty with respect to the Company’s ability to realize certain net deferred tax assets. In 2015, the Company recorded a valuation allowance against all of its U.S. net deferred tax assets, resulting in an increase in valuation allowance of $3.1 million in the fourth quarter of 2015. This increase in valuation allowance is offset partially by the release of $0.9 million valuation allowance against one of its Israel subsidiaries due to cumulative income generated in recent years. In the fourth quarter of 2016, the Company recorded an additional valuation allowance of $18.3 million against all of the United States deferred tax assets as well as its net operating losses generated in 2016. This increase in valuation allowance is offset partially by the release of $8.4 million of valuation allowance associated with the TVN French Subsidiary. Due to a change in its business model, as of December 31, 2016, the TVN French Subsidiary is forecasted to generate pretax income in future periods.

[2] Gross margin decreased to 49.7% in the first quarter of 2016 compared to 54.3% in the fourth quarter of 2015, primarily due to a $4.8 million decline in revenue resulting mostly from timing in revenue recognition for certain projects. Gross margin decreased to 46.6% in the second quarter of 2016 compared to 49.7% in the first quarter of 2016, primarily due to the inclusion of TVN’s operating results which resulted in higher material, labor and overhead costs attributable to the additional headcount and facilities acquired in connection with the TVN acquisition, as well as an approximately $4.5 million inventory obsolescence charge for some older Cable Edge product lines. Gross margin increased to 50.7% in the third quarter of 2016 compared to 46.6% in the second quarter of 2016 primarily due to the absence of the Cable Edge inventory obsolescence charge in the third quarter of 2016.

[3] In 2016, as part of the TVN integration plan, the Company established the TVN VDP to enable the French employees of TVN to voluntarily terminate with certain benefits. The plan was approved by the applicable French authorities and a total of 83 employees applied for the TVN VDP and were duly approved by the Company in the fourth quarter of 2016. Based on the applicable accounting guidance, the Company recorded a charge of $13.1 million for TVN VDP in the fourth quarter of 2016. This charge is offset partially by a $2.0 million pension curtailment gain. (See Note 11, “Restructuring and related charges-TVN VDP,” of the notes to the Consolidated Financial Statements for additional information on the TVN VDP and pension curtailment gain).

[4] On February 29, 2016, the Company completed the acquisition of TVN and applied the acquisition method of accounting for the business combination. The selected quarterly financial data for the year ended December 31, 2016 of the combined entity includes 10 months of operating results of TVN beginning March 1, 2016.

[5] In the first and third quarter of 2016, the Company recorded impairment charges of $1.5 million and $1.2 million, respectively, for its investment in Vislink. In the first quarter of 2015, the Company recorded an impairment charge of $2.5 million for its investment in VJU. These impairment charges were recorded as a result of the Company’s assessment which concluded that their impairment were on an other-than-temporary basis. (See Note 5, “Investments in Other Equity Securities,” of the notes to the Consolidated Financial Statements for additional information).

[6] The restructuring and related charges for the year ended December 31, 2016 is net of $0.6 million and $1.4 million, in product cost of revenue and operating expenses-restructuring and related charges, respectively, of gain from TVN pension curtailment. See Note 13, “Employee Benefit Plans and Stock-based Compensation-TVN Retirement Benefit Plan,” for additional information on gain from TVN pension curtailment.