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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) (Details) MMBoe in Thousands, MBbls in Thousands, Bcf in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 MMBoe MBbls Bcf | Dec. 31, 2020 MMBoe MBbls Bcf | Dec. 31, 2019 MMBoe MBbls Bcf | Dec. 31, 2018 MMBoe Bcf MBbls
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Beginning balance | MMBoe | 2,278,636 | 2,150,422 | 1,934,136 |
Revision of prior estimates | MMBoe | (61,967) | (57,808) | 7,834 |
Extensions, discoveries and other additions | MMBoe | 170,988 | 328,976 | 352,731 |
Production | MMBoe | (167,113) | (142,954) | (144,229) |
Sales of reserves in place | MMBoe |  |  | (50) |
Purchases of reserves in place | MMBoe | 672,038 |  |  |
Ending balance | MMBoe | 2,892,582 | 2,278,636 | 2,150,422 |
Proved Developed Reserves | MMBoe | 2,128,439 | 1,434,714 | 1,342,589 | 1,233,790
Proved Undeveloped Reserves | MMBoe | 764,143 | 843,922 | 807,833 | 700,346
Performance Revision |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Revision of prior estimates | MMBoe | (97,000) | (41,000) | 11,000 |
Proved Undeveloped Reserves Reclassification |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Revision of prior estimates | MMBoe | (6,000) | (11,000) | (3,000) |
Performance Revisions And Drilling |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Revision of prior estimates | MMBoe | 57,000 | (61,000) | 69,000 |
Certain Proved Developed Producing Properties |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Revision of prior estimates | MMBoe | (40,000) | 21,000 | (58,000) |
Pricing And Cost Revisions |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Revision of prior estimates | MMBoe | 42,000 |  |  |
Pennsylvania |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |
Extensions, discoveries and other additions | MMBoe | 152,000 | 329,000 | 353,000 |
Crude Oil |  |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |  |
Beginning balance | 15 | 22 | 120 |
Revision of prior estimates | 10,837 | (3) | (48) |
Extensions, discoveries and other additions | 2,633 | 0 | 0 |
Production | (8,150) | (4) | 0 |
Sales of reserves in place |  |  | (50) |
Purchases of reserves in place | 184,094 |  |  |
Ending balance | 189,429 | 15 | 22 |
Proved Developed Reserves | 153,010 | 15 | 22 | 107
Proved Undeveloped Reserves | 36,419 | 0 | 0 | 13
Natural Gas |  |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |  |
Beginning balance | Bcf | 13,672 | 12,903 | 11,604 |
Revision of prior estimates | Bcf | (538) | (347) | 48 |
Extensions, discoveries and other additions | Bcf | 973 | 1,974 | 2,116 |
Production | Bcf | (911) | (858) | (865) |
Sales of reserves in place | Bcf |  |  | 0 |
Purchases of reserves in place | Bcf | 1,699 |  |  |
Ending balance | Bcf | 14,895 | 13,672 | 12,903 |
Proved Developed Reserves | Bcf | 10,691 | 8,608 | 8,056 | 7,402
Proved Undeveloped Reserves | Bcf | 4,204 | 5,064 | 4,847 | 4,202
NGL |  |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 |
Revision of prior estimates | 16,797 | 0 | 0 |
Extensions, discoveries and other additions | 6,100 | 0 | 0 |
Production | (7,104) | 0 | 0 |
Sales of reserves in place |  |  | 0 |
Purchases of reserves in place | 204,822 |  |  |
Ending balance | 220,615 | 0 | 0 |
Proved Developed Reserves | 193,598 | 0 | 0 | 0
Proved Undeveloped Reserves | 27,017 | 0 | 0 | 0

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- Definition The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447 + Details
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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447 + Details
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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61797-109447 + Details
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