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Summary of significant accounting policies - Revenue recognition (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) source area	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of revenue sources | source	2
Operating regions | area	5
Revenue	$ 394,069	$ 497,417	$ 290,193
Permian
Disaggregation of Revenue [Line Items]
Revenue	237,730	266,856	151,179
Eagle Ford
Disaggregation of Revenue [Line Items]
Revenue	46,410	64,879	40,898
Bakken
Disaggregation of Revenue [Line Items]
Revenue	51,128	64,999	56,055
Haynesville
Disaggregation of Revenue [Line Items]
Revenue	24,833	62,743	12,039
DJ
Disaggregation of Revenue [Line Items]
Revenue	33,968	37,880	29,191
SCOOP/STACK
Disaggregation of Revenue [Line Items]
Revenue	0	60	831
Oil
Disaggregation of Revenue [Line Items]
Revenue	317,099	338,163	215,250
Natural gas
Disaggregation of Revenue [Line Items]
Revenue	$ 76,970	$ 159,254	$ 74,943

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