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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 |

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