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v3.19.1

Restricted cash (Tables) | 12 Months Ended
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Dec. 31, 2018
Restricted Cash [Abstract] |
Summary of Restricted Cash |
| December 31, 2018 |  |  | December 31, 2017 |
Current: |  |  |
Restricted cash deposits - Greece | $ | 296 |  |  | $ | 310 |
| 296 |  |  | 310 |
Non-current: |  |  |
Restricted credit card deposits | 58 |  |  | 43 |
Restricted cash related to Letter of Guarantee - Greece | 10,670 |  |  | 9,743 |
Environmental guarantee deposits | 2,721 |  |  | 2,831 |
| $ | 13,449 |  |  | $ | 12,617 |

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