Annual report pursuant to Section 13 and 15(d)

Equity Method Investments (Details)

v3.8.0.1
Equity Method Investments (Details) - USD ($)
$ in Millions
Jul. 27, 2016
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Difference between carrying value of equity method investment and equity   $ 118.1
Finite lived intangible asset, weighted average useful life 14 years 10 months 24 days  
Wireless Maritime Services    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 49.00%  
Santander    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 49.00%