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Significant Accounting Policies - Impact of the Adoption of ASU 2014-09 on Balance Sheet (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current Assets    
Trade accounts receivable $ 16,126 $ 4,772
Prepayments and other assets 2,017 2,275
Liabilities    
Current liabilities 115,159 $ 123,071
Balances without adoption of ASU 2014-09    
Current Assets    
Trade accounts receivable 17,526  
Prepayments and other assets 1,620  
Liabilities    
Current liabilities 115,194  
Effect of change    
Current Assets    
Trade accounts receivable (1,400)  
Prepayments and other assets 397  
Liabilities    
Current liabilities $ 35