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Long-Term Debt (Details)
3 Months Ended
May 09, 2017
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
May 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 120,825,000     $ 78,828,000
Long-term debt, percentage bearing annual interest rate   4.486%      
Amount of borrowings   $ 85,200,000      
Repayments of borrowings   $ 43,200,000      
Averaged interest rate on borrowings   4.64% 3.62%    
Commitment fees on borrowings   $ 200,000 $ 200,000    
Amortization of deferred financing costs   103,000 69,000    
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   275,000,000      
Long-term debt outstanding   120,800,000     $ 78,800,000
Additional borrowing base available under credit agreement   154,200,000      
Capitalized costs associated with borrowings   $ 0      
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     $ 3,000    
Subsequent Event | EEH Credit Agreement          
Debt Instrument [Line Items]          
Current borrowing base under EEH credit agreement       $ 325,000,000