Annual report pursuant to Section 13 and 15(d)

Equity Method Investments - Schedule of Summarized Financial Information (Details)

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Equity Method Investments - Schedule of Summarized Financial Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Current assets $ 40,224 $ 35,859
Non-current assets 26,115 21,009
Current liabilities 15,880 15,151
Non-current liabilities 2,581 1,056
Revenue 132,087 133,419
Operating expenses 109,024 111,458
Net income 23,063 21,961
Carrying value in the Company’s equity method investments 83,135 137,299
Wireless Maritime Services and Santander    
Schedule of Equity Method Investments [Line Items]    
Carrying value in the Company’s equity method investments $ 83,135 $ 137,299