Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregation of Revenue (Details)

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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenue $ 164,027 $ 151,537 $ 486,487 $ 459,871
Licensing and services        
Disaggregation of Revenue [Line Items]        
Revenue 157,604 143,610 460,560 433,400
Media & Content Reporting Unit        
Disaggregation of Revenue [Line Items]        
Revenue 80,649 71,348 239,020 222,294
Media & Content Reporting Unit | Licensing and services        
Disaggregation of Revenue [Line Items]        
Revenue 80,649 71,348 239,020 222,294
Connectivity        
Disaggregation of Revenue [Line Items]        
Revenue 83,378 80,189 247,467 237,577
Connectivity | Aviation Services        
Disaggregation of Revenue [Line Items]        
Revenue 31,113 27,028 89,862 84,661
Connectivity | Aviation Equipment        
Disaggregation of Revenue [Line Items]        
Revenue 3,464 6,127 17,773 19,845
Connectivity | Maritime & Land Services        
Disaggregation of Revenue [Line Items]        
Revenue 45,842 45,234 131,678 126,445
Connectivity | Maritime & Land Equipment        
Disaggregation of Revenue [Line Items]        
Revenue $ 2,959 $ 1,800 $ 8,154 $ 6,626