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Segment Reporting Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Depreciation | $ 6,725 | $ 7,608 | $ 7,193
Amortization expense | 4,312 | 4,956 | 5,526
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation | 77 | 461 | 389
Amortization expense | 0 | 0 | 0
Mobile Connectivity [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation | 5,720 | 6,084 | 5,843
Amortization expense | 4,312 | 4,956 | 5,526
Intertial Navigation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation | 928 | 1,063 | 961
Amortization expense | $ 0 | $ 0 | $ 0

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- Definition Amortization expense + References No definition available. + Details
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Balance Type: | credit
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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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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |