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Restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current:    
Restricted cash deposits - Greece $ 20 $ 296
Restricted cash 20 296
Non-current:    
Restricted cash related to Letter of Guarantee - Greece 0 10,670
Environmental guarantee deposits and other 3,080 2,779
Restricted cash and cash equivalents $ 3,080 $ 13,449