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Supplemental Gas Data (unaudited) - Proved Undeveloped Reserves (Details) bbl in Thousands, Mcfe in Thousands, Mcf in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) Mcfe well bbl Mcf | Dec. 31, 2022 USD ($) Mcfe Mcf bbl | Dec. 31, 2021 USD ($) Mcfe Mcf bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 9,806,890 | 9,625,730 | 9,549,758
Revisions (energy) | (454,409) | (387,320) | (327,050)
Price changes (energy) | (465,314) | 24,904 | 86,532
Extensions and Discoveries (energy) | 582,229 | 1,123,745 | 906,738
Production (MMcfe) | (560,366) | (580,169) | (590,248)
Sales of Reserves In-Place (MMcfe) | (168,288) |  |
Ending balance (energy) | 8,740,742 | 9,806,890 | 9,625,730
Proved developed resources (energy) | 6,027,762 | 6,221,422 | 5,905,611
Proved undeveloped resources (energy) | 2,712,980 | 3,585,468 | 3,720,119
Downward revision due to plan changes (energy) | 710,000 | 24,000 | 356,000
Upward revision from increased performance (energy) | 467,000 |  | 331,000
Proved and unproved resources, extensions and discoveries (energy) | 42,000 | 23,000 | 26,000
Downward revision for acreage consolidation (energy) | 169,000 |  | 267,000
Downward revision due to 5 year rule (energy) |  |  | 60,000
Revision due to mining and performance | 43,000 |  |
Performance revision associated with proved developed producing assets (energy) | 467,000 |  | 46,000
Revision for fallen wells | 146,000 |  |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 679,404 | $ 565,754 | $ 465,861
Downward revision due to risk in well development (energy) |  |  | 20,000
Reserves reported for more than five years | 290,000 |  |
Utica | Central Pennsylvania and Southwest Pennsylvania |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 204,000 |  |
Number of dry gas wells added | well | 9 |  |
Marcellus | Southwest Pennsylvania and West Virginia |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 336,000 |  |
Number of dry gas wells added | well | 16 |  |
Shale |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Downward revision due to plan changes (energy) |  | 66,000 |
Downward revision for acreage consolidation (energy) |  | 298,000 |
Natural Gas |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | Mcf | 9,187,278 | 8,987,807 | 9,034,066
Revisions (volume) | Mcf | (698,397) | (339,878) | (409,215)
Price Changes (volume) | Mcf | (382,311) | 24,795 | 82,248
Extension and Discoveries (volume) | Mcf | 478,026 | 1,055,250 | 832,696
Production (volume) | Mcf | (514,668) | (540,696) | (551,988)
Sales of Reserves In-Place (volume) | Mcf | (146,936) |  |
Ending balance (volume) | Mcf | 7,922,992 | 9,187,278 | 8,987,807
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | Mcf | 5,521,437 | 5,788,814 | 5,569,332
Proved undeveloped resources (volume) | Mcf | 2,401,555 | 3,398,464 | 3,418,475
NGLs |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 100,153 | 102,285 | 81,867
Revisions (volume) | bbl | 41,119 | (6,140) | 13,655
Price Changes (volume) | bbl | (12,733) | 17 | 692
Extension and Discoveries (volume) | bbl | 16,778 | 10,324 | 12,047
Production (volume) | bbl | (7,410) | (6,333) | (5,976)
Sales of Reserves In-Place (volume) | bbl | (3,196) |  |
Ending balance (volume) | bbl | 134,711 | 100,153 | 102,285
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 83,682 | 70,063 | 53,204
Proved undeveloped resources (volume) | bbl | 51,029 | 30,090 | 49,081
Condensate & Crude Oil |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 3,115 | 4,036 | 4,081
Revisions (volume) | bbl | (453) | (1,768) | 39
Price Changes (volume) | bbl | (1,101) | 1 | 22
Extension and Discoveries (volume) | bbl | 589 | 1,092 | 294
Production (volume) | bbl | (206) | (246) | (400)
Sales of Reserves In-Place (volume) | bbl | (363) |  |
Ending balance (volume) | bbl | 1,581 | 3,115 | 4,036
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 706 | 2,038 | 2,843
Proved undeveloped resources (volume) | bbl | 875 | 1,077 | 1,193
Proved Undeveloped |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 3,585,468 |  |
Undeveloped Reserves Transferred to Developed (energy) | (819,365) |  |
Extensions and Discoveries (energy) | 540,345 |  |
Ending balance (energy) | 2,712,980 | 3,585,468 |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 319,475 |  |
Proved Undeveloped | Price Revisions |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (181,837) |  |
Proved Undeveloped | Revisions Due to Plan Changes |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (168,800) |  |
Proved Undeveloped | Revisions Due to Changes Related to Well Performance |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | 466,730 |  |
Proved Undeveloped | Revisions Due to 5 Year Rule |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (709,561) |  |

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