Quarterly report pursuant to Section 13 or 15(d)

Goodwill (Details)

v3.8.0.1
Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Goodwill [Roll Forward]        
Gross beginning balance $ 390,696      
Accumulated impairment loss beginning balance (231,000)      
Net beginning balance 159,696      
Impairment loss 0   $ (78,000) $ (167,000)
Foreign currency translation adjustments (42)      
Gross ending balance 390,654 $ 390,696   390,696
Accumulated impairment loss ending balance (231,000) (231,000)   (231,000)
Net ending balance 159,654 159,696   159,696
Aviation Connectivity Reporting Unit        
Goodwill [Roll Forward]        
Gross beginning balance 98,037      
Accumulated impairment loss beginning balance (44,000)      
Net beginning balance 54,037      
Impairment loss 0 (44,000)    
Foreign currency translation adjustments (16)      
Gross ending balance 98,021 98,037   98,037
Accumulated impairment loss ending balance (44,000) (44,000)   (44,000)
Net ending balance 54,021 54,037   54,037
Maritime & Land Connectivity Reporting Unit        
Goodwill [Roll Forward]        
Gross beginning balance 209,130      
Accumulated impairment loss beginning balance (187,000)      
Net beginning balance 22,130      
Impairment loss 0 (45,000) $ (78,000)  
Foreign currency translation adjustments 0      
Gross ending balance 209,130 209,130   209,130
Accumulated impairment loss ending balance (187,000) (187,000)   (187,000)
Net ending balance 22,130 22,130   22,130
Media & Content        
Goodwill [Roll Forward]        
Gross beginning balance 83,529      
Accumulated impairment loss beginning balance 0      
Net beginning balance 83,529      
Impairment loss 0      
Foreign currency translation adjustments (26)      
Gross ending balance 83,503 83,529   83,529
Accumulated impairment loss ending balance 0 0   0
Net ending balance $ 83,503 $ 83,529   $ 83,529