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Segment Reporting Deprecation and Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | $ 2,235 | $ 1,649 | $ 6,380 | $ 4,956
Amortization expense | 958 | 1,096 | 3,101 | 3,266
Mobile Connectivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 1,842 | 1,339 | 5,212 | 4,212
Amortization expense | 958 | 1,096 | 3,101 | 3,266
Intertial Navigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 260 | 293 | 766 | 687
Amortization expense | 0 | 0 | 0 | 0
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 133 | 17 | 402 | 57
Amortization expense | $ 0 | $ 0 | $ 0 | $ 0

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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=98514028&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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