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Asset Retirement Obligations - Changes in AROs (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Changes in our AROs:    
AROs at beginning of year $ 61,356 $ 51,956
Accretion expense 2,794 2,364
AROs at end of period $ 64,150 $ 54,320