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Long-Term Debt (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May 09, 2017
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
May 01, 2019
USD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Long-term debt outstanding   $ 110,000   $ 110,000       $ 78,828
Long-term debt, percentage bearing annual interest rate   4.39%   4.39%        
Amount of borrowings   $ 128,100   $ 128,100        
Repayments of borrowings       $ 96,900        
Averaged interest rate on borrowings   4.58% 3.66% 4.61% 3.64%      
Commitment fees on borrowings   $ 200 $ 300 $ 300 $ 500      
Amortization of deferred financing costs   100 $ 100 215 143      
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           $ 325,000 $ 275,000  
Long-term debt outstanding   110,000   110,000       $ 78,800
Additional borrowing base available under credit agreement   215,000   215,000        
Capitalized costs associated with borrowings   $ 200   $ 200        
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         $ 200