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Segment Reporting Deprecation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Depreciation $ 2,192 $ 1,614 $ 4,145 $ 3,307
Amortization expense 1,046 1,102 2,143 2,170
Mobile Connectivity [Member]        
Segment Reporting Information [Line Items]        
Depreciation 1,810 1,394 3,370 2,872
Amortization expense 1,046 1,102 2,143 2,170
Intertial Navigation [Member]        
Segment Reporting Information [Line Items]        
Depreciation 254 199 506 395
Amortization expense 0 0 0 0
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Depreciation 128 21 269 40
Amortization expense $ 0 $ 0 $ 0 $ 0