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Financial risk management objectives and policies - Liquidity risk (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]    
Long-term debt $ 42,687 $ 44,419
Accrued liabilities and other payables 1,319 1,455
Trade payables 6,433 4,258
Total 50,439 50,132
Less than 3 months    
Disclosure of financial liabilities [line items]    
Long-term debt 1,720 1,145
Accrued liabilities and other payables 1,319 1,455
Trade payables 6,433 4,258
Total 9,472 6,858
3 to 12 months    
Disclosure of financial liabilities [line items]    
Long-term debt 24,502 12,989
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total 24,502 12,989
1 to 5 years    
Disclosure of financial liabilities [line items]    
Long-term debt 16,465 30,285
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total 16,465 30,285
More than 5 years    
Disclosure of financial liabilities [line items]    
Long-term debt 0 0
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total $ 0 $ 0