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Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":18724000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":22384000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2018"},{"start":"2019-01-01","end":"2019-12-31","val":43174000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019"},{"start":"2021-01-01","end":"2021-12-31","val":49294000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2021"},{"start":"2022-01-01","end":"2022-12-31","val":47711000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2022"},{"start":"2023-01-01","end":"2023-12-31","val":29687000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2023"}]}},"ExplorationCostsCumulative":{"label":"Exploration Costs, Cumulative","description":"\"The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. Exploration costs also include costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, the maintenance of land and lease records, dry hole contributions and bottom hole contributions, costs of drilling and equipping exploratory wells and costs of drilling exploratory-type stratigraphic test wells.\"","units":{"USD":[{"end":"2019-12-31","val":84282000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019Q4I"},{"end":"2020-12-31","val":13768000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2020Q4I"},{"end":"2021-12-31","val":19640000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2021Q4I"},{"end":"2022-12-31","val":0,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2022Q4I"},{"end":"2023-12-31","val":286000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2023Q4I"}]}},"ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts":{"label":"Extensions, Discoveries, Additions and Improved Recovery, Less Related Costs","description":"Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas 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Lease, Liability","description":"Present value of lessee's discounted obligation for lease payments from finance lease.","units":{"USD":[{"end":"2019-03-31","val":0,"accn":"0000928022-20-000073","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2019Q1I"},{"end":"2019-12-31","val":2141000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28"},{"end":"2019-12-31","val":2141000,"accn":"0000928022-20-000140","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05"},{"end":"2019-12-31","val":2141000,"accn":"0000928022-20-000166","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2019Q4I"},{"end":"2020-03-31","val":1651000,"accn":"0000928022-20-000073","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2020Q1I"},{"end":"2020-06-30","val":1035000,"accn":"0000928022-20-000140","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05","frame":"CY2020Q2I"},{"end":"2020-09-30","val":864000,"accn":"0000928022-20-000166","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2020Q3I"},{"end":"2020-12-31","val":758000,"accn":"0000928022-21-000021","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-25","frame":"CY2020Q4I"},{"end":"2021-12-31","val":486000,"accn":"0000928022-22-000027","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-24","frame":"CY2021Q4I"},{"end":"2022-12-31","val":260000,"accn":"0000928022-23-000017","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-23","frame":"CY2022Q4I"},{"end":"2023-12-31","val":38000,"accn":"0000928022-24-000031","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-26","frame":"CY2023Q4I"}]}},"FinanceLeaseLiabilityCurrent":{"label":"Finance 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current.","units":{"USD":[{"end":"2019-03-31","val":0,"accn":"0000928022-20-000073","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2019Q1I"},{"end":"2019-12-31","val":1334000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28"},{"end":"2019-12-31","val":1334000,"accn":"0000928022-20-000140","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05"},{"end":"2019-12-31","val":1334000,"accn":"0000928022-20-000166","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2019Q4I"},{"end":"2020-03-31","val":927000,"accn":"0000928022-20-000073","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2020Q1I"},{"end":"2020-06-30","val":463000,"accn":"0000928022-20-000140","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-05","frame":"CY2020Q2I"},{"end":"2020-09-30","val":321000,"accn":"0000928022-20-000166","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2020Q3I"}]}},"FinanceLeaseLiabilityNoncurrent":{"label":"Finance 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They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. Depreciation, depletion, and amortization of capitalized acquisition, exploration, and development costs are not production costs but also become part of the cost of oil and gas produced along with production (lifting) costs identified above.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":0,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":7756000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":56151000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2018"},{"start":"2019-01-01","end":"2019-12-31","val":78492000,"accn":"0000928022-20-000031","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-28","frame":"CY2019"}]}},"ProductionCostsCumulative":{"label":"Production Costs, Cumulative","description":"The capitalized costs incurred (excluded from amortization), as of the date of the balance sheet, to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. 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