Derivative Instruments - Schedule of Realized and Unrealized Gains (losses) on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Gains and (losses) on derivative instruments
Net unrealized gains on derivative instruments			$ 18,898		$ 28,624
Natural gas swaps
Gains and (losses) on derivative instruments
Natural gas swaps gains	$ 5,040	$ 141	12,998	$ 746
Natural gas swaps losses	(2,640)	(8,461)	(5,035)	(23,107)
Total	$ 2,400	$ (8,320)	7,963	$ (22,361)
Net unrealized gains on derivative instruments			$ 18,898		$ 28,624

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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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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