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SUPPLEMENTAL OIL AND GAS RESERVE INFORMATION (UNAUDITED) - Changes in Standardized Measure (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Changes in Standardized Measure |  |  |
Standardized measure - beginning of year | $ 887,760 | $ 975,129 | $ 904,295
Sales, net of production costs | (278,867) | (266,202) | (236,953)
Net changes of prices and production costs related to future production | 10,854 | (107,311) | (302,599)
Revisions of previous quantity estimates, net of related costs | 139,001 | 151,289 | 128,727
Net changes in state margin taxes | (1,223) | 1,952 | 10,433
Accretion of discount | 70,163 | 76,600 | 78,425
Purchases of reserves in place | 98,210 |  | 435,230
Timing differences and other | 44,032 | 56,303 | (42,429)
Standardized measure - end of year | $ 969,930 | $ 887,760 | $ 975,129

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