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DISCLOSURES ABOUT OIL AND GAS PRODUCING ACTIVITIES (UNAUDITED) - Change in Quantities of Proved Oil, Natural Gas Liquids, and Natural Gas Reserves (Details) bbl in Thousands, Mcf in Thousands, MBoe in Millions, Boe in Millions | 12 Months Ended
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Dec. 31, 2021 Boe MBoe $ / MMBTU $ / bbl bbl Mcf | Dec. 31, 2020 Boe MBoe $ / bbl $ / MMBTU bbl Mcf | Dec. 31, 2019 Boe $ / bbl $ / MMBTU bbl Mcf | Dec. 31, 2018 $ / MMBTU $ / bbl bbl Mcf
Proved reserves demoted to non-proved |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Proved developed and undeveloped reserve, revision upward (reduction) of previous estimate (energy) | Boe | (24.1) | (22.9) | (8.7) |
Proved developed and undeveloped reserve, drilling program, term | 5 years |  |  |
Wattenberg Field, Rocky Mountain Region |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Proved developed and undeveloped reserve, revision upward (reduction) of previous estimate (energy) | Boe | (20.0) | 7.5 | 6.6 |
Revisions to previous estimates - increase (decrease) | Boe |  |  | (1.4) |
Wattenberg Field, Rocky Mountain Region | Changes in Well Operating Cost Methodology |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Proved developed and undeveloped reserve, revision upward (reduction) of previous estimate (energy) | Boe | (13.1) |  |  |
Wattenberg Field, Rocky Mountain Region | Engineering Revisions |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Proved developed and undeveloped reserve, revision upward (reduction) of previous estimate (energy) | Boe | (6.9) | 12.3 | 8.1 |
Revisions to previous estimates - increase (decrease) | MBoe | 7.1 | (4.8) |  |
Wattenberg Field, Rocky Mountain Region | Fuel, Gas, Interest, and Other Negative Revisions |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Proved developed and undeveloped reserve, revision upward (reduction) of previous estimate (energy) | Boe | (7.1) |  |  |
Horizontal development | Wattenberg Field, Rocky Mountain Region |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Extensions and discoveries | Boe | 0.0 | 18.0 | 15.4 |
Oil contracts |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Balance at the beginning of the period | 52,793 | 64,413 | 64,354 |
Extensions, discoveries and infills | 19 | 9,376 | 8,825 |
Production | (4,523) | (5,019) | (5,136) |
Sales of minerals in place |  |  | (52) |
Removed from capital program | (12,249) | (14,120) | (4,926) |
Purchases of minerals in place | 114,379 | 1,430 | 303 |
Revisions to previous estimates | (6,840) | (3,287) | 1,045 |
Balance at the end of the period | 143,579 | 52,793 | 64,413 | 64,354
Proved developed reserves | 104,078 | 24,320 | 25,397 |
Proved undeveloped reserves | 39,501 | 28,473 | 39,016 |
Oil and gas commodity price (in dollars per share) | $ / bbl |  |  | 55.85 |
Oil contracts | Wattenberg Field, Rocky Mountain Region |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Oil and gas commodity price (in dollars per share) | $ / bbl | 66.56 | 39.57 | 55.85 | 65.56
Gas contracts |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Balance at the beginning of the period | Mcf | 235,728 | 212,200 | 165,012 |
Extensions, discoveries and infills | Mcf | 103 | 32,172 | 20,604 |
Production | Mcf | (13,852) | (14,166) | (11,967) |
Sales of minerals in place | Mcf |  |  | (110) |
Removed from capital program | Mcf | (43,918) | (33,886) | (11,508) |
Purchases of minerals in place | Mcf | 767,504 | 5,457 | 627 |
Revisions to previous estimates | Mcf | (57,066) | 33,951 | 49,542 |
Balance at the end of the period | Mcf | 888,499 | 235,728 | 212,200 | 165,012
Proved developed reserves | Mcf | 748,762 | 123,220 | 105,840 |
Proved undeveloped reserves | Mcf | 139,737 | 112,508 | 106,360 |
Oil and gas commodity price (in dollars per share) | $ / MMBTU |  |  | 2.58 |
Gas contracts | Wattenberg Field, Rocky Mountain Region |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Oil and gas commodity price (in dollars per share) | $ / MMBTU | 3.60 | 1.99 | 2.58 | 3.10
Natural gas liquids (per Bbl) |  |  |  |
Changes in quantities of proved oil, natural gas liquids and natural gas reserves |  |  |  |
Balance at the beginning of the period | 26,111 | 22,161 | 24,930 |
Extensions, discoveries and infills | 0 | 3,269 | 3,123 |
Production | (1,763) | (1,858) | (1,431) |
Sales of minerals in place |  |  | (18) |
Removed from capital program | (4,485) | (3,141) | (1,862) |
Purchases of minerals in place | 89,797 | 570 | 102 |
Revisions to previous estimates | (3,632) | 5,110 | (2,683) |
Balance at the end of the period | 106,028 | 26,111 | 22,161 | 24,930
Proved developed reserves | 88,967 | 14,315 | 11,566 |
Proved undeveloped reserves | 17,061 | 11,796 | 10,595 |

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- Definition Additions to proved reserves, measured in energy equivalents, that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + References No definition available. + Details
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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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- Definition Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, 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 (a) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447 + Details
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- Definition Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields. + 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61831-109447 + Details
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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 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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