Long-Term Debt	6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Credit Agreement On May 23, 2018, Earthstone Energy Holdings, LLC (“EEH” or the “Borrower”), a subsidiary of Earthstone, each of Earthstone Operating, LLC, EF Non-Op, LLC, Sabine River Energy, LLC, Earthstone Legacy Properties, LLC, Lynden USA Operating, LLC, Bold Energy III LLC, Bold Operating, LLC, as guarantors (the “Guarantors”), BOKF, NA dba Bank Of Texas, as Administrative Agent, and the lenders party thereto (the “Lenders”), entered into an amendment (the “Amendment”) to the Credit Agreement dated May 9, 2017, by and among EEH, as Borrower, the Guarantors, BOKF, NA dba Bank Of Texas, as Agent and Lead Arranger, Wells Fargo Bank, National Association, as Syndication Agent, and the Lenders (together with all amendments or other modifications, the “EEH Credit Agreement”). Among other things, the Amendment increased the borrowing base from $185.0 million to $225.0 million, provided for a 50-basis point decrease in the interest rate on outstanding loans, increased flexibility related to hedging limitations and provided the ability to obtain short-term borrowings via a swingline as a part of the borrowing base. On May 9, 2017, in connection with the closing of the Bold Transaction, the Company exited its credit agreement dated December 19, 2014, by and among Earthstone and its subsidiaries, BOKF, NA dba Bank of Texas, and the Lenders party thereto (as amended, modified or restated from time to time, the “ESTE Credit Agreement”). At that time, all outstanding borrowings of $10.0 million under the ESTE Credit Agreement were repaid and $0.5 million of remaining unamortized deferred financing costs were expensed. The borrowing base under the EEH Credit Agreement is subject to redetermination on or about November 1st and May 1st of each year. The amounts borrowed under the EEH Credit Agreement bear annual interest rates at either (a) the London Interbank Offered Rate (“LIBOR”) plus 1.75% to 2.75% or (b) the prime lending rate of Bank of Texas plus 0.75% to 1.75%, depending on the amounts borrowed under the EEH Credit Agreement. Principal amounts outstanding under the EEH Credit Agreement are due and payable in full at maturity on May 9, 2022. All of the obligations under the EEH Credit Agreement, and the guarantees of those obligations, are secured by substantially all of EEH’s assets. Additional payments due under the EEH Credit Agreement include paying a commitment fee of 0.375% or 0.50%, depending on borrowing base utilization, per year to the Lenders in respect of the unutilized commitments thereunder, as well as certain other customary fees. The EEH Credit Agreement contains a number of covenants that, among other things, restrict, subject to certain exceptions, EEH’s ability to incur additional indebtedness, create liens on assets, make investments, enter into sale and leaseback transactions, pay dividends and make distributions or repurchase its limited liability interests, engage in mergers or consolidations, sell certain assets, sell or discount any notes receivable or accounts receivable and engage in certain transactions with affiliates. In addition, the EEH Credit Agreement requires EEH to maintain the following financial covenants: a current ratio, as defined, of not less than 1.0 to 1.0 and a leverage ratio of not greater than 4.0 to 1.0. Leverage ratio means the ratio of (i) the aggregate debt of EEH and its consolidated subsidiaries as at the last day of the fiscal quarter (excluding any debt from obligations relating to non-cash losses under FASB ASC 815 as a result of changes in the fair market value of derivatives) to (ii) the product of EBITDAX for such fiscal quarter multiplied by four. The term “EBITDAX” means, for any period, the sum of consolidated net income for such period plus (a) the following expenses or charges to the extent deducted from consolidated net income in such period: (i) interest, (ii) taxes, (iii) depreciation, (iv) depletion, (v) amortization, (vi) non-cash losses under FASB ASC 815 as a result of changes in the fair market value of derivatives, (vii) exploration expenses, (viii) impairment expenses, and (ix) non-cash compensation expenses and minus (b) to the extent included in consolidated net income in such period, non-cash gains under FASB ASC 815 as a result of changes in the fair market value of derivatives. The EEH Credit Agreement contains customary affirmative covenants and defines events of default to include failure to pay principal or interest, breach of covenants, breach of representations and warranties, insolvency, judgment default, and if Frank A. Lodzinski ceases to serve and function as Chief Executive Officer of EEH and the majority of the Lenders do not approve of Mr. Lodzinski’s successor. Upon the occurrence and continuance of an event of default, the Lenders have the right to accelerate repayment of the loans and exercise their remedies with respect to the collateral. As of June 30, 2018, EEH was in compliance with the covenants under the EEH Credit Agreement. As of June 30, 2018, the Company had a $225.0 million borrowing base under the EEH Credit Agreement, of which $22.5 million was outstanding, bearing annual interest of 3.838%, resulting in an additional $202.5 million of borrowing base availability under the EEH Credit Agreement. At December 31, 2017, there were $25.0 million of borrowings outstanding under the EEH Credit Agreement. For the six months ended June 30, 2018, the Company had borrowings of $25.0 million and $27.5 million in repayments of borrowings. For the three and six months ended June 30, 2018, interest on borrowings averaged 3.66% and 3.64% per annum, respectively, which excluded commitment fees of $0.3 million and $0.5 million, respectively, and amortization of deferred financing costs of $0.1 million and $0.1 million, respectively. For the three and six months ended June 30, 2017, interest on borrowings averaged 4.32% and 4.45% per annum, respectively, of which both excluded commitment fees of $0.1 million and amortization of deferred financing costs of $0.1 million. The Company capitalized $0.2 million of costs associated with the EEH Credit Agreement for both the three and six months ended June 30, 2018. The Company capitalized $1.1 million of costs associated with the ESTE Credit Agreement for both the three and six months ended June 30, 2017. These capitalized costs are included in Other noncurrent assets in the Condensed Consolidated Balance Sheets. The Company’s policy is to capitalize the financing costs associated with its debt and amortize those costs on a straight-line basis over the term of the associated debt.

Long-Term Debt

Credit Agreement

On May 23, 2018, Earthstone Energy Holdings, LLC (“EEH” or the “Borrower”), a subsidiary of Earthstone, each of Earthstone Operating, LLC, EF Non-Op, LLC, Sabine River Energy, LLC, Earthstone Legacy Properties, LLC, Lynden USA Operating, LLC, Bold Energy III LLC, Bold Operating, LLC, as guarantors (the “Guarantors”), BOKF, NA dba Bank Of Texas, as Administrative Agent, and the lenders party thereto (the “Lenders”), entered into an amendment (the “Amendment”) to the Credit Agreement dated May 9, 2017, by and among EEH, as Borrower, the Guarantors, BOKF, NA dba Bank Of Texas, as Agent and Lead Arranger, Wells Fargo Bank, National Association, as Syndication Agent, and the Lenders (together with all amendments or other modifications, the “EEH Credit Agreement”). Among other things, the Amendment increased the borrowing base from $185.0 million to $225.0 million, provided for a 50-basis point decrease in the interest rate on outstanding loans, increased flexibility related to hedging limitations and provided the ability to obtain short-term borrowings via a swingline as a part of the borrowing base.

On May 9, 2017, in connection with the closing of the Bold Transaction, the Company exited its credit agreement dated December 19, 2014, by and among Earthstone and its subsidiaries, BOKF, NA dba Bank of Texas, and the Lenders party thereto (as amended, modified or restated from time to time, the “ESTE Credit Agreement”). At that time, all outstanding borrowings of $10.0 million under the ESTE Credit Agreement were repaid and $0.5 million of remaining unamortized deferred financing costs were expensed.

The borrowing base under the EEH Credit Agreement is subject to redetermination on or about November 1st and May 1st of each year. The amounts borrowed under the EEH Credit Agreement bear annual interest rates at either (a) the London Interbank Offered Rate (“LIBOR”) plus 1.75% to 2.75% or (b) the prime lending rate of Bank of Texas plus 0.75% to 1.75%, depending on the amounts borrowed under the EEH Credit Agreement. Principal amounts outstanding under the EEH Credit Agreement are due and payable in full at maturity on May 9, 2022. All of the obligations under the EEH Credit Agreement, and the guarantees of those obligations, are secured by substantially all of EEH’s assets. Additional payments due under the EEH Credit Agreement include paying a commitment fee of 0.375% or 0.50%, depending on borrowing base utilization, per year to the Lenders in respect of the unutilized commitments thereunder, as well as certain other customary fees.

The EEH Credit Agreement contains a number of covenants that, among other things, restrict, subject to certain exceptions, EEH’s ability to incur additional indebtedness, create liens on assets, make investments, enter into sale and leaseback transactions, pay dividends and make distributions or repurchase its limited liability interests, engage in mergers or consolidations, sell certain assets, sell or discount any notes receivable or accounts receivable and engage in certain transactions with affiliates.

In addition, the EEH Credit Agreement requires EEH to maintain the following financial covenants: a current ratio, as defined, of not less than 1.0 to 1.0 and a leverage ratio of not greater than 4.0 to 1.0. Leverage ratio means the ratio of (i) the aggregate debt of EEH and its consolidated subsidiaries as at the last day of the fiscal quarter (excluding any debt from obligations relating to non-cash losses under FASB ASC 815 as a result of changes in the fair market value of derivatives) to (ii) the product of EBITDAX for such fiscal quarter multiplied by four. The term “EBITDAX” means, for any period, the sum of consolidated net income for such period plus (a) the following expenses or charges to the extent deducted from consolidated net income in such period: (i) interest, (ii) taxes, (iii) depreciation, (iv) depletion, (v) amortization, (vi) non-cash losses under FASB ASC 815 as a result of changes in the fair market value of derivatives, (vii) exploration expenses, (viii) impairment expenses, and (ix) non-cash compensation expenses and minus (b) to the extent included in consolidated net income in such period, non-cash gains under FASB ASC 815 as a result of changes in the fair market value of derivatives.

The EEH Credit Agreement contains customary affirmative covenants and defines events of default to include failure to pay principal or interest, breach of covenants, breach of representations and warranties, insolvency, judgment default, and if Frank A. Lodzinski ceases to serve and function as Chief Executive Officer of EEH and the majority of the Lenders do not approve of Mr. Lodzinski’s successor. Upon the occurrence and continuance of an event of default, the Lenders have the right to accelerate repayment of the loans and exercise their remedies with respect to the collateral. As of June 30, 2018, EEH was in compliance with the covenants under the EEH Credit Agreement.

As of June 30, 2018, the Company had a $225.0 million borrowing base under the EEH Credit Agreement, of which $22.5 million was outstanding, bearing annual interest of 3.838%, resulting in an additional $202.5 million of borrowing base availability under the EEH Credit Agreement. At December 31, 2017, there were $25.0 million of borrowings outstanding under the EEH Credit Agreement.

For the six months ended June 30, 2018, the Company had borrowings of $25.0 million and $27.5 million in repayments of borrowings.

For the three and six months ended June 30, 2018, interest on borrowings averaged 3.66% and 3.64% per annum, respectively, which excluded commitment fees of $0.3 million and $0.5 million, respectively, and amortization of deferred financing costs of $0.1 million and $0.1 million, respectively. For the three and six months ended June 30, 2017, interest on borrowings averaged 4.32% and 4.45% per annum, respectively, of which both excluded commitment fees of $0.1 million and amortization of deferred financing costs of $0.1 million.

The Company capitalized $0.2 million of costs associated with the EEH Credit Agreement for both the three and six months ended June 30, 2018. The Company capitalized $1.1 million of costs associated with the ESTE Credit Agreement for both the three and six months ended June 30, 2017. These capitalized costs are included in Other noncurrent assets in the Condensed Consolidated Balance Sheets. The Company’s policy is to capitalize the financing costs associated with its debt and amortize those costs on a straight-line basis over the term of the associated debt.