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Summary of significant accounting policies - Revenue recognition (Details) $ in Thousands | 12 Months Ended
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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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