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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions FASB ASC Topic 850, Related Party Disclosures, requires that information about transactions with related parties that would make a difference in decision making shall be disclosed so that users of the financial statements can evaluate their significance. Earthstone's significant shareholder consists of various investment funds managed by a private equity firm who may manage other investments in entities with which the Company interacts in the normal course of business. On February 12, 2020, the Company sold certain of its interests in oil and natural gas leases and wells in an arm’s length transaction to a portfolio company of Earthstone’s significant shareholder (not under common control) for cash consideration of approximately $0.4 million. In connection with the Olenik v. Lodzinski et al. lawsuit described below in Note 16. Commitments and Contingencies, Earthstone’s significant shareholder was also named in the lawsuit. As a result of the Settlement Agreement (defined below), the Company has concluded negotiations with its insurance carrier regarding an allocation of defense costs and settlement contributions above its deductible for all the parties named in the lawsuit.