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Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jun. 30, 2017 | Jul. 01, 2016 | Dec. 31, 2016 | Oct. 22, 2014 | Sep. 02, 2014
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value | $ 3,800,000 | $ 4,400,000 |  |  |  | $ 3,800,000 |  | $ 4,400,000 |  |
Research and development | 27,055,000 |  |  | $ 26,507,000 |  | 51,937,000 | $ 50,070,000 |  |  |
Prepaid expenses and other current assets | 24,318,000 | 26,319,000 |  |  |  | 24,318,000 |  | 26,319,000 |  |
Cost-method Investments, Other than Temporary Impairment | 0 |  |  | $ 0 |  | 0 | $ 1,476,000 |  |  |
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 | 200,000 | $ 800,000 |  |  |  | 200,000 |  | 800,000 |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  |  |  |  |  | (300,000) |  | $ 300,000 |  |
Cost-method Investments, Other than Temporary Impairment |  |  | $ 1,200,000 |  | $ 1,500,000 |  |  |  |  |
Stock Price Increase, Percentage |  | 67.00% |  |  |  |  |  |  |  |
Pebble Beach Systems [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Cost Method Investments Carrying Value | 200,000 |  |  |  |  | 200,000 |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | (100,000) |  |  |  |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 500,000 |  |  |  |  | 500,000 |  |  |  |
Stock Price Decrease, Percentage | 83.00% |  |  |  |  |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] | 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 |  |  |  |
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 3,600,000 |  |  |  |  | 3,600,000 |  |  |  |
Other Expense [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 100,000 |  |  |  |  | $ 100,000 |  |  |  |

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