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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
--- | ---
Dec. 31, 2019 USD ($) well Mcfe Mcf bbl | Dec. 31, 2018 USD ($) Mcfe Mcf bbl | Dec. 31, 2017 USD ($) Mcfe Mcf bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 7,881,335 | 7,581,612 | 6,251,648
Revisions (energy) | (518,570) | 320,925 | (232,321)
Price changes (energy) | (45,246) | 28,315 | 181,470
Extensions and Discoveries (energy) | 1,647,297 | 960,808 | 1,887,153
Production (MMcfe) | (539,149) | (507,104) | (407,166)
Purchases of Reserves In-Place (energy) |  | 321,975 |
Sales of Reserves In-Place (energy) |  | (825,196) | (99,172)
Ending balance (energy) | 8,425,667 | 7,881,335 | 7,581,612
Proved developed resources (energy) | 4,838,858 | 4,494,878 | 4,409,065
Proved undeveloped resources (energy) | 3,586,809 | 3,386,457 | 3,172,547
Downward revision due to PUD removal (energy) | (304,000) |  | (458,000)
Upward revision from increased performance through optimization (energy) | 657,000 | 472,000 |
Downward revision due to plan changes (energy) | 872,000 | 151,000 |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 1,192,599 | $ 1,116,397 | $ 632,846
Reserves reported for more than five years | 248,570 |  |
Number of wells pending determination of proved reserves | well | 1 |  |
Proved Undeveloped |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Capital spent related to undeveloped reserves transferred to developed | $ | $ 334,062 |  |
Proved Undeveloped |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Beginning balance (energy) | 3,386,457 |  |
Undeveloped reserves transferred to developed | (752,970) |  |
Extensions and Discoveries (energy) | 1,570,576 |  |
Ending balance (energy) | 3,586,809 | 3,386,457 |
Proved Undeveloped | Revisions Due to Five Year Rule |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (303,787) |  |
Proved Undeveloped | Price Revisions |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | 2,147 |  |
Proved Undeveloped | Revisions Due to Plan Changes |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | (872,495) |  |
Proved Undeveloped | Revisions Due to Changes Due to Well Performance |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Revisions (energy) | 556,881 |  |
Natural Gas |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | Mcf | 7,436,338 | 7,121,758 | 5,828,399
Revisions (volume) | Mcf | (521,617) | 313,091 | (202,735)
Price Changes (volume) | Mcf | (40,773) | 28,100 | 173,738
Extension and Discoveries (volume) | Mcf | 1,569,813 | 839,268 | 1,769,029
Production (volume) | Mcf | (505,355) | (468,228) | (364,893)
Purchases of Reserves In-Place (volume) | Mcf |  | 317,437 |
Sales of Reserves In-Place (volume) | Mcf |  | (715,088) | (81,780)
Ending balance (volume) | Mcf | 7,938,406 | 7,436,338 | 7,121,758
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | Mcf | 4,473,534 | 4,242,579 | 4,051,526
Proved undeveloped resources (volume) | Mcf | 3,464,873 | 3,193,759 | 3,070,232
NGLs |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 65,904,000 | 71,691,000 | 60,532,000
Revisions (volume) | bbl | 5,926,000 | 441,000 | 1,162,000
Price Changes (volume) | bbl | (740,000) | 32,000 | 1,188,000
Extension and Discoveries (volume) | bbl | 10,182,000 | 16,247,000 | 17,887,000
Production (volume) | bbl | (5,428,000) | (6,011,000) | (6,456,000)
Purchases of Reserves In-Place (volume) | bbl |  | 756,000 |
Sales of Reserves In-Place (volume) | bbl |  | (17,252,000) | (2,622,000)
Ending balance (volume) | bbl | 75,844,000 | 65,904,000 | 71,691,000
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 59,800,000 | 40,180,000 | 56,022,000
Proved undeveloped resources (volume) | bbl | 16,044,000 | 25,724,000 | 15,669,000
Condensate & Crude Oil |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |
Beginning balance (volume) | bbl | 8,261,000 | 4,950,000 | 10,009,000
Revisions (volume) | bbl | (5,418,000) | 865,000 | (5,834,000)
Price Changes (volume) | bbl | (5,000) | 4,000 | (159,000)
Extension and Discoveries (volume) | bbl | 2,732,000 | 4,010,000 | 1,800,000
Production (volume) | bbl | (204,000) | (468,000) | (589,000)
Purchases of Reserves In-Place (volume) | bbl |  | 0 |
Sales of Reserves In-Place (volume) | bbl |  | (1,100,000) | (277,000)
Ending balance (volume) | bbl | 5,366,000 | 8,261,000 | 4,950,000
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |
Proved developed resources (volume) | bbl | 1,087,000 | 1,870,000 | 3,567,000
Proved undeveloped resources (volume) | bbl | 4,278,000 | 6,391,000 | 1,383,000

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