Quarterly report pursuant to Section 13 or 15(d)

Concentrations (Details)

v3.8.0.1
Concentrations (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Concentration Risk [Line Items]        
Cash and cash equivalents $ 105,372 $ 219,182 $ 50,686 $ 223,552
Sales Revenue Segment | Customer Concentration Risk        
Concentration Risk [Line Items]        
Southwest Airlines, concentration risk, percent 18.00% 23.00%    
Sales Revenue Segment | Customer Concentration Risk | Aviation Connectivity        
Concentration Risk [Line Items]        
Southwest Airlines, concentration risk, percent 78.00% 85.00%    
Accounts Receivable | Customer Concentration Risk        
Concentration Risk [Line Items]        
Southwest Airlines, concentration risk, percent 8.00% 12.00%    
Foreign Subsidiaries        
Concentration Risk [Line Items]        
Cash and cash equivalents $ 32,700