Asset Acquisitions and Divestitures - Narrative (Details)			12 Months Ended				36 Months Ended
	Jun. 01, 2023 USD ($) a	Jun. 30, 2022 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2025 USD ($) payment
Asset Acquisition [Line Items]
Net Proceeds from Sale of Exploration and Production Properties			$ 0		$ 0	$ 254,439,000
Gain on Sale of Assets			0		0	12,736,000
Reduction in asset retirement obligation			25,556,000		14,448,000	$ 71,171,000
California Asset Sale
Asset Acquisition [Line Items]
Total sale price		$ 253,500,000
Net Proceeds from Sale of Exploration and Production Properties		240,900,000
Gain on Sale of Assets		12,700,000
Reduction in asset retirement obligation		50,100,000
California Asset Sale | Forecast
Asset Acquisition [Line Items]
Maximum annual contingent payment							$ 10,000,000
Amount of each incremental contingency payment							1,000,000
Incremental price, exceeding ICE Brent Average Price (in dollars per barrel)							1
California Asset Sale | Full Cost Method of Accounting Assets
Asset Acquisition [Line Items]
Disposal of assets		220,700,000
California Asset Sale | Assets Not Subject to Full Cost Method of Accounting
Asset Acquisition [Line Items]
Disposal of assets		32,800,000
California Asset Sale | Minimum
Asset Acquisition [Line Items]
ICE Brent Average (in dollars per barrel)				$ 95
California Asset Sale | Minimum | Forecast
Asset Acquisition [Line Items]
ICE Brent Average (in dollars per barrel)							$ 95
California Asset Sale | Maximum | Forecast
Asset Acquisition [Line Items]
Number of annual contingent payments | payment							3
ICE Brent Average (in dollars per barrel)							$ 105
California Asset Sale | Present Value of Contingent Consideration
Asset Acquisition [Line Items]
Value of contingent consideration received from sale of assets		$ 12,600,000	$ 700,000		$ 7,300,000
SWN Upstream Asset Acquisition
Asset Acquisition [Line Items]
Total consideration	$ 124,758,000
Net acres acquired in Appalachia | a	34,000