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Restricted cash (Tables)
 12 Months Ended
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