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Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Apr. 01, 2016 | Dec. 31, 2016 | Oct. 22, 2014 | Sep. 02, 2014
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |
Cost Method Investments Carrying Value | $ 3,900,000 | $ 4,400,000 |  |  | $ 4,400,000 |  |
Research and development | 24,882,000 |  |  | $ 23,563,000 |  |  |
Prepaid expenses and other current assets | 27,368,000 | 26,319,000 |  |  | 26,319,000 |  |
Cost-method Investments, Other than Temporary Impairment | 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 | 300,000 | $ 800,000 |  |  | 800,000 |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | (200,000) |  |  |  | $ 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 | 300,000 |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | $ (500,000) |  |  |  |  |  |
Stock Price Decrease, Percentage | 67.00% |  |  |  |  |  |
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 |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 3,600,000 |  |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment | $ 0 |  |  |  |  |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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