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Segment Reporting Segment Reporting - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | $ 40,449 | $ 45,966 | $ 80,660 | $ 86,346
Operating Income (Loss) | (1,368) | (693) | (5,838) | (4,067)
Net interest and other expense | (302) | (91) | (557) | (438)
(Loss) income before income tax expense | (1,670) | (784) | (6,395) | (4,505)
Mobile Connectivity and Intertial Navigation Combined [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 3,000 | 3,227 | 3,578 | 4,290
Other Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (4,368) | (3,920) | (9,416) | (8,357)
Operating Segments [Member] | Mobile Connectivity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 34,034 | 36,890 | 68,321 | 72,155
Operating Income (Loss) | 2,638 | 1,631 | 3,260 | 3,621
Operating Segments [Member] | Intertial Navigation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue, Net | 6,415 | 9,076 | 12,339 | 14,191
Operating Income (Loss) | $ 362 | $ 1,596 | $ 318 | $ 669

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