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SUPPLEMENTAL OIL AND GAS RESERVE INFORMATION (UNAUDITED) - Standardized Measure (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Standardized Measure        
Future cash inflows $ 2,213,270 $ 2,040,600 $ 2,226,313  
Future production costs (162,622) (152,322) (164,848)  
Future state margin taxes (47,672) (45,384) (49,144)  
Future net cash flows 2,002,976 1,842,894 2,012,321  
Less 10% annual discount to reflect timing of cash flows (1,033,046) (955,134) (1,037,192)  
Standard measure of discounted future net cash flows $ 969,930 $ 887,760 $ 975,129 $ 904,295