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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

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