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v3.20.1

Restricted cash (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement of cash flows [abstract] |
Schedule of restricted cash |
| December 31, 2019 |  |  | December 31, 2018 |
Current: |  |  |
Restricted cash deposits - Greece | $ | 20 |  |  | $ | 296 |
| $ | 20 |  |  | $ | 296 |
Non-current: |  |  |
Restricted cash related to Letter of Guarantee - Greece | $ | — |  |  | $ | 10,670 |
Environmental guarantee deposits and other | 3,080 |  |  | 2,779 |
| $ | 3,080 |  |  | $ | 13,449 |

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