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Fair value measurements - Carrying amounts and fair values of financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Carrying Value    
Assets:    
Derivative instruments - commodity derivatives $ 12,306 $ 10,089
Equity investments 50,427 0
Liabilities:    
Derivative instruments - common stock warrants 0 11,902
Revolving credit facilities 110,000 0
Derivative instruments - commodity derivatives 0 431
Fair Value    
Assets:    
Derivative instruments - commodity derivatives 12,306 10,089
Equity investments 50,427 0
Liabilities:    
Derivative instruments - common stock warrants 0 11,902
Revolving credit facilities 110,000 0
Derivative instruments - commodity derivatives $ 0 $ 431