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ASSET RETIREMENT OBLIGATIONS - Schedule of Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
ASSET RETIREMENT OBLIGATIONS.      
Balance at beginning of year $ 31,087 $ 28,960  
Additional asset retirement obligations acquired/incurred 1,040 470  
Expenditures made (58) (237)  
Accretion of asset retirement obligations 1,667 1,465 $ 1,403
Revisions to estimates 1,183 429  
Balance at end of year $ 34,919 $ 31,087 $ 28,960