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Long-Term Debt (Details)
3 Months Ended 6 Months Ended
May 23, 2018
USD ($)
May 09, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Repayments of borrowings         $ 27,500,000    
Long-term debt     $ 22,500,000   $ 22,500,000   $ 25,000,000
Long-term debt, percentage bearing annual interest rate     3.838%   3.838%    
Amount of borrowings     $ 25,000,000   $ 25,000,000    
Averaged interest rate on borrowings     3.66% 4.32% 3.64% 4.45%  
Commitment fees on borrowings     $ 300,000 $ 100,000 $ 500,000 $ 100,000  
Amortization of deferred financing costs     100,000 100,000 143,000 137,000  
Bold Transaction | Four Year Senior Secured Revolving Credit Facility              
Debt Instrument [Line Items]              
Repayments of borrowings   $ 10,000,000          
EEH Credit Agreement              
Debt Instrument [Line Items]              
Credit agreement, covenant, current ratio   1.0          
Credit agreement, covenant, leverage ratio   4.0          
EBITDAX multiplier   4          
Current borrowing base under EEH credit agreement     225,000,000   225,000,000    
Long-term debt     22,500,000   22,500,000   $ 25,000,000
Additional borrowing base available under credit agreement     202,500,000   202,500,000    
Capitalized costs associated with borrowings     $ 200,000   $ 200,000    
EEH Credit Agreement | Minimum              
Debt Instrument [Line Items]              
Commitment fee percentage   0.375%          
EEH Credit Agreement | Maximum              
Debt Instrument [Line Items]              
Commitment fee percentage   0.50%          
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Applicable margin percentage   1.75%          
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Applicable margin percentage   2.75%          
EEH Credit Agreement | Prime Rate | Minimum              
Debt Instrument [Line Items]              
Applicable margin percentage   0.75%          
EEH Credit Agreement | Prime Rate | Maximum              
Debt Instrument [Line Items]              
Applicable margin percentage   1.75%          
Earthstone Energy Credit Agreement              
Debt Instrument [Line Items]              
Capitalized costs associated with borrowings       $ 1,100,000   $ 1,100,000  
Write-off of Deferred Financing Costs | Bold Transaction | Four Year Senior Secured Revolving Credit Facility              
Debt Instrument [Line Items]              
Remaining unamortized deferred financing costs   $ 500,000          
Line of Credit | EEH Credit Agreement              
Debt Instrument [Line Items]              
Line of credit, borrowing base $ 225,000,000.0 $ 185,000,000.0          
Reduction in basis points 0.50%