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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
	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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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.

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Sales price per unit of oil and gas produced.

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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).

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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.

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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.

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Production of proved reserves.

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Sales of minerals in place.

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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.

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable 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.

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