Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Allocation Of Purchase Consideration (Details)

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Business Combinations - Allocation Of Purchase Consideration (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2016
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Weighted average useful life 14 years 11 months        
Goodwill   $ 248,644 $ 248,644   $ 327,836
Working capital settlement adjustment     $ (15,483) $ 0  
Wireless Maritime Services          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Ownership percentage 49.00%        
Santander          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Ownership percentage 49.00%        
Emerging Markets Communications LLC          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Cash and cash equivalents $ 8,208        
Restricted cash 16,257        
Other current assets 60,625        
Property, plant and equipment 82,220        
Equity method investments $ 152,700        
Weighted average useful life 5 years 11 months        
Other non-current assets $ 2,321        
Accounts payable and accrued liabilities (68,864)        
Debt, including current (371,990)        
Deferred tax liabilities, net (71,954)        
Unfavorable vendor contracts, including current (13,500)        
Deferred revenue, non-current (4,602)        
Other non-current liabilities (9,479)        
Estimated fair value of net assets acquired (132,558)        
Consideration transferred 165,039        
Goodwill $ 297,597        
Working capital settlement adjustment   $ (1,250)      
Emerging Markets Communications LLC | Completed technology          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Weighted average useful life 3 years 5 months        
Intangible assets: $ 18,500        
Emerging Markets Communications LLC | Customer relationships          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Weighted average useful life 8 years        
Intangible assets: $ 47,700        
Emerging Markets Communications LLC | Backlog          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Weighted average useful life 3 years        
Intangible assets: $ 18,300        
Emerging Markets Communications LLC | Trademarks          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Weighted average useful life 5 years        
Intangible assets: $ 1,000