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Financial instruments, Categories of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial assets [Abstract]        
Cash and cash equivalents $ 125,948 [1],[2] $ 60,658 [1],[2] $ 68,641 $ 67,356
Accounts receivable and accrued revenues [1] 59,465 30,361    
Derivative financial assets, current [3] 3,759 0    
Total financial assets 189,172 91,018    
Financial liabilities [Abstract]        
Accounts payables and accrued expenses [1] 29,398 19,662    
Derivative financial liabilities, current [3] 0 7,002    
Current portion long-term debt [1] 29,626 9,792    
Long-term debt [1] 367,069 512,507    
Derivative financial liabilities, non-current [3] 0 4,222    
Total financial liabilities 426,094 553,184    
Restricted cash $ 316 $ 289    
[1] Amortized cost.
[2] Cash and cash equivalents include $316 thousand in restricted cash in 2022 and $289 thousand in 2021, including employee withholding tax.
[3] Fair value through profit or loss.