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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) (Details) Mcf in Thousands, MBbls in Thousands, Bcfe in Thousands, Bcf in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2018 MMBTU | Feb. 28, 2018 MMBTU | Dec. 31, 2020 Bcfe Bcf MBbls Mcf | Dec. 31, 2019 Bcfe Bcf MBbls | Dec. 31, 2018 Bcfe Bcf MBbls | Dec. 31, 2017 Bcfe Bcf
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 12,903 | 11,605 | 9,726 |
Revision of prior estimates(3) |  |  | (347) | 47 | 780 |
Extensions, discoveries and other additions(4) |  |  | 1,974 | 2,116 | 2,244 |
Production |  |  | (858) | (865) | (735) |
Sales of reserves in place | (6,000) | (404,000) |  | 0 | (410) |
Ending balance |  |  | 13,672 | 12,903 | 11,605 |
Proved Developed Reserves |  |  | 8,608 | 8,056 | 7,403 | 6,187
Proved Undeveloped Reserves |  |  | 5,064 | 4,847 | 4,202 | 3,539
Volume ratio | Mcf |  |  | 6 |  |  |
Proved Undeveloped Reserves Reclassification |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Revision of prior estimates(3) |  |  | (66) | (18) | (345) |
Performance Revision |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Revision of prior estimates(3) |  |  |  | 67 |  |
Performance Revisions And Drilling |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Revision of prior estimates(3) |  |  | 123 | 417 |  |
Certain Proved Developed Producing Properties |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Revision of prior estimates(3) |  |  | (368) | (350) |  |
Pennsylvania |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Revision of prior estimates(3) |  |  |  |  | 1,123 |
Extensions, discoveries and other additions(4) |  |  | 1,974 | 2,116 | 2,243 |
Natural Gas |  |  |  |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |  |  |  |
Beginning balance | Bcf |  |  | 12,903 | 11,604 | 9,353 |
Revision of prior estimates(3) | Bcf |  |  | (347) | 48 | 776 |
Extensions, discoveries and other additions(4) | Bcf |  |  | 1,974 | 2,116 | 2,243 |
Production | Bcf |  |  | (858) | (865) | (730) |
Sales of reserves in place(5) | Bcf |  |  |  | 0 | (38) |
Ending balance | Bcf |  |  | 13,672 | 12,903 | 11,604 |
Proved Developed Reserves | Bcf |  |  | 8,608 | 8,056 | 7,402 | 6,001
Proved Undeveloped Reserves | Bcf |  |  | 5,064 | 4,847 | 4,202 | 3,352
Crude Oil and Natural Gas Liquids (NGL) |  |  |  |  |  |
Proved Developed and Undeveloped Reserves [Roll Forward] |  |  |  |  |  |
Beginning balance | MBbls |  |  | 22 | 120 | 62,252 |
Revision of prior estimates(3) | MBbls |  |  | (3) | (48) | 677 |
Extensions, discoveries and other additions(4) | MBbls |  |  | 0 | 0 | 0 |
Production | MBbls |  |  | (4) | 0 | (829) |
Sales of reserves in place(5) | MBbls |  |  |  | (50) | (61,980) |
Ending balance | MBbls |  |  | 15 | 22 | 120 |
Proved Developed Reserves | Bcf |  |  | 15 | 22 | 107 | 31,066
Proved Undeveloped Reserves | Bcf |  |  | 0 | 0 | 13 | 31,186
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Percentage of reserves |  |  |  |  |  | 13.70%
Natural Gas Liquids |  |  |  |  |  |
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward] |  |  |  |  |  |
Percentage of reserves |  |  |  |  |  | 1.00%

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- Definition Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, 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 (d) -URI http://asc.fasb.org/extlink&oid=68064819&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=68064819&loc=d3e61797-109447 + Details
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