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Long-Term Debt (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
May 01, 2019
USD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Long-term debt outstanding   $ 125,000   $ 125,000       $ 78,828
Long-term debt, percentage bearing annual interest rate   4.0435%   4.0435%        
Amount of borrowings   $ 165,300   $ 165,300        
Repayments of borrowings       $ 119,100        
Averaged interest rate on borrowings   4.38% 3.94% 4.53% 3.91%      
Commitment fees on borrowings   $ 200 $ 100 $ 500 $ 600      
Amortization of deferred financing costs   100 100 336 228      
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   125,000   125,000       $ 78,800
Additional borrowing base available under credit agreement   200,000   200,000        
Capitalized costs associated with borrowings   $ 40   $ 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     $ 100   $ 300