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Asset Retirement Obligation
9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Asset Retirement Obligation
The Company had a post-closure reclamation and site restoration obligation of $14,805 as of September 30, 2020. The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2019$6,142 
Additions8,424 
Accretion expense239 
Balance at September 30, 2020$14,805 
The additions above are related to the acquisition of Eagle Proppants Holdings. See Note 3 - Business Combination for additional information.