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Segment Reporting Segment Reporting - Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Depreciation $ 1,649 $ 1,690 $ 4,956 $ 5,412
Amortization expense 1,096 1,145 3,266 3,678
Mobile Connectivity [Member]        
Segment Reporting Information [Line Items]        
Depreciation 1,339 1,447 4,212 4,673
Amortization expense 1,096 1,145 3,266 3,678
Intertial Navigation [Member]        
Segment Reporting Information [Line Items]        
Depreciation 293 218 687 667
Amortization expense 0 0 0 0
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Depreciation 17 25 57 72
Amortization expense $ 0 $ 0 $ 0 $ 0