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Segment Reporting Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Revenue, Net | $ 40,211 | $ 40,380
Operating Income (Loss) | (4,470) | (3,374)
Net interest and other expense | (255) | (347)
(Loss) income before income tax expense | (4,725) | (3,721)
Mobile Connectivity and Intertial Navigation Combined [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | 578 | 1,063
Other Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating Income (Loss) | (5,048) | (4,437)
Operating Segments [Member] | Mobile Connectivity [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue, Net | 34,287 | 35,265
Operating Income (Loss) | 622 | 1,990
Operating Segments [Member] | Intertial Navigation [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenue, Net | 5,924 | 5,115
Operating Income (Loss) | $ (44) | $ (927)

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