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Income taxes - Schedule of income tax expense (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforwards | $ 13,677 | $ 11,500
Disallowed interest expense carryforward | 1,335 | 56
Asset retirement obligation | 2,169 | 1,128
Other deductible temporary differences | 495 | 32
Total deferred tax assets | 17,676 | 12,716
Less: valuation allowance | 0 | 0
Net deferred tax assets | 17,676 | 12,716
Deferred tax liabilities |  |
Property, plant and equipment | (88,870) | (60,269)
Unrealized derivatives | (2,795) | (2,196)
Total deferred tax liabilities | (91,665) | (62,465)
Net deferred tax liability | $ (73,989) | $ (49,749)

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