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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, 2020 USD ($) Mcfe well Mcf bbl | Dec. 31, 2019 USD ($) Mcfe bbl Mcf | Dec. 31, 2018 USD ($) Mcfe Mcf bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 8,425,667 | 7,881,335 | 7,581,612
Revisions (energy) | 740,129 | (518,570) | 320,925
Price changes (energy) | (1,351,934) | (45,246) | 28,315
Extensions and Discoveries (energy) | 2,246,968 | 1,647,297 | 960,808
Production (MMcfe) | (511,072) | (539,149) | (507,104)
Sales of Reserves In-Place (energy) |  |  | (825,196)
Ending balance (energy) | 9,549,758 | 8,425,667 | 7,881,335
Proved developed resources (energy) | 5,199,748 | 4,838,858 | 4,494,878
Proved undeveloped resources (energy) | 4,350,010 | 3,586,809 | 3,386,457
Upward revision from increased performance (energy) | 579,000 | 657,000 | 472,000
Downward revision due to plan changes (energy) | 677,000 | 872,000 | 151,000
Proved and unproved resources, extensions and discoveries (energy) | 70,000 | 77,000 |
Downward revision due to PUD removal (energy) |  | 304,000 |
Increase in reserve due to decrease in operating costs (energy) | 853,000 |  |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 487,291 | $ 1,192,599 | $ 1,116,397
Reserves reported for more than five years | 320,987 |  |
Utica |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Downward revision due to plan changes (energy) | 88,000 |  |
Number of wells removed from development plan | well | 4 |  |
Utica | Central Pennsylvania and Southwest Pennsylvania |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 711,000 |  |
Number of dry gas wells added | well | 23 |  |
Marcellus |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Upward revision from increased performance (energy) | 342,000 |  |
Downward revision due to plan changes (energy) | 579,000 |  |
Number of wells removed from development plan | well | 23 |  |
Marcellus | Southwest Pennsylvania and West Virginia |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved and unproved resources, extensions and discoveries (energy) | 1,465,000 |  |
Number of dry gas wells added | well | 47 |  |
Natural Gas |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | Mcf | 7,938,406 | 7,436,338 | 7,121,758
Revisions (volume) | Mcf | 407,836 | (521,617) | 313,091
Price Changes (volume) | Mcf | (1,019,523) | (40,773) | 28,100
Extension and Discoveries (volume) | Mcf | 2,188,773 | 1,569,813 | 839,268
Production (volume) | Mcf | (481,426) | (505,355) | (468,228)
Sales of Reserves In-Place (volume) | Mcf |  |  | (715,088)
Ending balance (volume) | Mcf | 9,034,066 | 7,938,406 | 7,436,338
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | Mcf | 4,939,283 | 4,473,534 | 4,242,579
Proved undeveloped resources (volume) | Mcf | 4,094,783 | 3,464,873 | 3,193,759
NGLs |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 75,844,000 | 65,904,000 | 71,691,000
Revisions (volume) | bbl | 51,857,000 | 5,926,000 | 441,000
Price Changes (volume) | bbl | (50,456,000) | (740,000) | 32,000
Extension and Discoveries (volume) | bbl | 9,299,000 | 10,182,000 | 16,247,000
Production (volume) | bbl | (4,677,000) | (5,428,000) | (6,011,000)
Sales of Reserves In-Place (volume) | bbl |  |  | (17,252,000)
Ending balance (volume) | bbl | 81,867,000 | 75,844,000 | 65,904,000
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 42,204,000 | 59,800,000 | 40,180,000
Proved undeveloped resources (volume) | bbl | 39,664,000 | 16,044,000 | 25,724,000
Condensate & Crude Oil |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 5,366,000 | 8,261,000 | 4,950,000
Revisions (volume) | bbl | 3,525,000 | (5,418,000) | 865,000
Price Changes (volume) | bbl | (4,946,000) | (5,000) | 4,000
Extension and Discoveries (volume) | bbl | 400,000 | 2,732,000 | 4,010,000
Production (volume) | bbl | (264,000) | (204,000) | (468,000)
Sales of Reserves In-Place (volume) | bbl |  |  | (1,100,000)
Ending balance (volume) | bbl | 4,081,000 | 5,366,000 | 8,261,000
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 1,207,000 | 1,087,000 | 1,870,000
Proved undeveloped resources (volume) | bbl | 2,874,000 | 4,278,000 | 6,391,000
Proved Undeveloped |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 3,586,809 |  |
Undeveloped reserves transferred to developed | (1,152,598) |  |
Extensions and Discoveries (energy) | 2,176,326 |  |
Ending balance (energy) | 4,350,010 | 3,586,809 |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 257,952 |  |
Proved Undeveloped | Price Revisions |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (380,200) |  |
Proved Undeveloped | Revisions Due to Plan Changes |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (691,054) |  |
Proved Undeveloped | Revisions Due to Changes Due to Well Performance |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | 810,727 |  |

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