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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of asset retirement obligations
The following table describes the changes in our AROs (in thousands):
AROs at January 1, 2020$28,258  
Accretion expense1,304  
AROs at June 30, 2020$29,562