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Segment Reporting Segments - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue, Net |  |  |  |  | $ 176,122 | $ 184,634 | $ 172,591
Operating Income (Loss) | $ (268) | $ 3,013 | $ (693) | $ (3,374) | (1,322) | 3,208 | 1,922
Net interest and other expense |  |  |  |  | (648) | (542) | (597)
(Loss) income before income tax expense |  |  |  |  | (1,970) | 2,666 | 1,325
Mobile Connectivity and Intertial Navigation Combined [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  | 15,313 | 17,393 | 15,487
Other Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  | (16,635) | (14,185) | (13,565)
Operating Segments [Member] | Mobile Connectivity [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue, Net |  |  |  |  | 141,507 | 147,809 | 129,819
Operating Income (Loss) |  |  |  |  | 10,041 | 9,459 | 5,056
Operating Segments [Member] | Intertial Navigation [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue, Net |  |  |  |  | 34,615 | 36,825 | 42,772
Operating Income (Loss) |  |  |  |  | $ 5,272 | $ 7,934 | $ 10,431

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