Annual report pursuant to Section 13 and 15(d)

Equity Method Investments (Details)

v3.8.0.1
Equity Method Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Jul. 27, 2016
Dec. 31, 2015
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage       22.00%
Difference between carrying value of equity method investment and equity $ 141,100,000      
Finite lived intangible asset, weighted average useful life 14 years 11 months      
Equity method investments carrying value $ 156,527,000   $ 0  
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%