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Financial instruments, Categories of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial assets [Abstract]        
Cash and cash equivalents $ 68,641 [1],[2] $ 67,356 [1],[2] $ 94,944 $ 77,292
Accounts receivable and accrued revenues [1] 30,060 107,848    
Total financial assets 98,700 175,204    
Financial liabilities [Abstract]        
Accounts payable and accrued expenses [1] 18,503 23,998    
Derivative financial liabilities, current [3] 9,073 4,320    
Current portion long term debt [1] 3,396 100,385    
Long term debt [1] 446,562 750,586    
Derivative financial liabilities, non-current [3] 14,601 11,279    
Total financial liabilities 492,135 890,569    
Restricted cash $ 229 $ 221    
[1] Amortized cost.
[2] Cash and cash equivalents include $299 thousand in restricted cash in 2020 and $221 thousand in 2019, including employee withholding tax.
[3] Fair value through profit or loss.