Fair value measurements - Fair value of assets measured at fair value on a nonrecurring basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment	$ 26,500,000	$ 0		$ 0
Fair Value, Nonrecurring | Oil and natural gas properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	31,781,000	0	$ 0
Impairment	$ 26,496,000	$ 0	$ 0