Derivative Instruments - Schedule of Derivative Instruments as Recorded in Consolidated Balance Sheets (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative asset (liability), net	$ 2,418	$ 11,038
FTRs | Energy risk management assets, current
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative asset	4,315	2,084
FTRs | Energy risk management liabilities, current
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative liability	(297)	(256)
Natural gas derivatives | Energy risk management assets, current
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative asset	2,876	9,210
Natural gas derivatives | Energy risk management assets, noncurrent
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative asset	1,281	0
Natural gas derivatives | Energy risk management liabilities, current
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative liability	(5,224)	0
Natural gas derivatives | Energy risk management liabilities, noncurrent
Price Risk Derivatives, at Fair Value, Net [Abstract]
Derivative liability	$ (533)	$ 0