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Segment Reporting Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mobile Connectivity | Mobile Comm Product Sales        
Segment Reporting Information [Line Items]        
Percent of consolidated net sales 21.00% 21.00% 20.00% 22.00%
Mobile Connectivity | VSAT Airtime Service Sales        
Segment Reporting Information [Line Items]        
Percent of consolidated net sales 49.00% 45.00% 50.00% 46.00%
Intertial Navigation | FOG System Sales        
Segment Reporting Information [Line Items]        
Percent of consolidated net sales 17.00% 17.00% 15.00% 16.00%
Non-US        
Segment Reporting Information [Line Items]        
Percent of consolidated net sales 61.00% 55.00% 60.00% 54.00%