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Financial instruments - Schedule of Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value of Financial Instruments [Line Items]
Unrealized loss on commodity contracts	$ 5,780	$ 15,502
Gain on derivative financial instruments	829	4,564
Not Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Amortization of cash flow hedge	2,516	6,173
Commodity contracts \| Not Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Unrealized loss on commodity contracts	$ (1,687)	$ (1,609)

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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