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Financial instruments, Categories of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial assets [Abstract]        
Cash and cash equivalents $ 60,658 [1],[2] $ 68,641 [1],[2] $ 67,356 $ 94,944
Accounts receivable and accrued revenues [1] 30,361 30,060    
Total financial assets 91,018 98,700    
Financial liabilities [Abstract]        
Accounts payables and accrued expenses [1] 19,662 18,503    
Derivative financial liabilities, current [3] 7,002 9,073    
Current portion long-term debt [1] 9,792 3,396    
Long-term debt [1] 512,507 446,562    
Derivative financial liabilities, non-current [3] 4,222 14,601    
Total financial liabilities 553,184 492,135    
Restricted cash $ 289 $ 299    
[1] Amortized cost.
[2] Cash and cash equivalents include $289 thousand in restricted cash in 2021 and $299 thousand in 2020, including employee withholding tax.
[3] Fair value through profit or loss.