Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($)		3 Months Ended				9 Months Ended		12 Months Ended
		Sep. 30, 2016	Apr. 01, 2016	Oct. 02, 2015	Apr. 03, 2015	Sep. 30, 2016	Oct. 02, 2015	Dec. 31, 2015	Oct. 15, 2015	Oct. 22, 2014	Sep. 26, 2014	Sep. 02, 2014
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value		$ 4,100,000				$ 4,100,000		$ 5,400,000
Research and development		24,202,000		$ 21,679,000		74,272,000	$ 65,824,000
Prepaid expenses and other current assets		38,519,000				38,519,000		25,003,000
Cost-method Investments, Other than Temporary Impairment		1,259,000		$ 0		2,735,000	$ 2,505,000
VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent									9.90%		19.80%
Cost Method Investments Original Cost											$ 2,500,000
Cost-method Investments, Other than Temporary Impairment					$ 2,500,000
Vislink plc [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent												3.30%
Cost Method Investments Original Cost												$ 3,300,000
Cost Method Investments Carrying Value		500,000				$ 500,000		1,800,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax								1,500,000
Period Stock Price Below Cost						7 months
Cost-method Investments, Other than Temporary Impairment		1,300,000	$ 1,500,000					$ 0
Stock Price Decrease, Percentage						70.00%
EDC [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent										18.40%
Cost Method Investments Original Cost										$ 3,500,000
Cost-method Investments, Other than Temporary Impairment						$ 0
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value		3,593,000				3,593,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	3,593,000				3,593,000
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	0				0
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value		3,593,000				3,593,000
Business Acquisition, Transaction Costs	[2]	100,000				100,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1],[2]	3,593,000				3,593,000
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value		0				0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]	$ 0				$ 0

[1] The Company did not provide financial support to any of its unconsolidated VIEs and as of September 30, 2016, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.

[2] The Company’s maximum exposure to loss with respect to EDC as of September 30, 2016 was limited to a total investment cost of $3.6 million, including $0.1 million of transaction costs.