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SUPPLEMENTAL OIL AND GAS RESERVE INFORMATION (UNAUDITED) - Changes in Standardized Measure (Details) - USD ($)
$ in Thousands
 12 Months Ended
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