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Segment Reporting Segment Reporting - Deprecation and Amortization Expense (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]        
Depreciation $ 1,614 $ 1,815 $ 3,307 $ 3,722
Amortization expense 1,102 1,250 2,170 2,533
Mobile Connectivity [Member]        
Segment Reporting Information [Line Items]        
Depreciation 1,394 1,567 2,872 3,226
Amortization expense 1,102 1,250 2,170 2,533
Intertial Navigation [Member]        
Segment Reporting Information [Line Items]        
Depreciation 199 224 395 448
Amortization expense 0 0 0 0
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Depreciation 21 24 40 48
Amortization expense $ 0 $ 0 $ 0 $ 0