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Segment Reporting Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | $ 1,649 | $ 1,690 | $ 4,956 | $ 5,412
Amortization expense | 1,096 | 1,145 | 3,266 | 3,678
Mobile Connectivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 1,339 | 1,447 | 4,212 | 4,673
Amortization expense | 1,096 | 1,145 | 3,266 | 3,678
Intertial Navigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 293 | 218 | 687 | 667
Amortization expense | 0 | 0 | 0 | 0
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 17 | 25 | 57 | 72
Amortization expense | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amortization expense + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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