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Segment Reporting Segments - Net Sales and Operating Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | $ 160,088 | $ 176,122 | $ 184,634
Operating Income (Loss) | $ (1,125) | $ (1,801) | $ (1,368) | $ (4,470) | $ (268) | $ 3,013 | $ (693) | $ (3,374) | (8,764) | (1,322) | 3,208
Net interest and other expense |  |  |  |  |  |  |  |  | (1,174) | (648) | (542)
(Loss) income before income tax expense |  |  |  |  |  |  |  |  | (9,938) | (1,970) | 2,666
Mobile Connectivity and Intertial Navigation Combined [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 7,890 | 15,313 | 17,393
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (16,654) | (16,635) | (14,185)
Operating Segments [Member] | Mobile Connectivity [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 132,227 | 141,507 | 147,809
Operating Income (Loss) |  |  |  |  |  |  |  |  | 7,334 | 10,041 | 9,459
Operating Segments [Member] | Intertial Navigation [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 27,861 | 34,615 | 36,825
Operating Income (Loss) |  |  |  |  |  |  |  |  | $ 556 | $ 5,272 | $ 7,934

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