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
Jun. 29, 2017
Jul. 27, 2016
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2017
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           $ 248,693 $ 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   298,847          
Working capital settlement adjustment $ (1,300) $ (1,250) $ (1,300)        
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