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Long-Term Debt (Details)
12 Months Ended
May 23, 2018
USD ($)
May 09, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 06, 2018
USD ($)
Debt Instrument [Line Items]          
Long-term debt     $ 78,828,000 $ 25,000,000  
Long-term debt, percentage bearing annual interest rate     4.4794%    
Amount of borrowings     $ 156,800,000    
Repayments of borrowings     (103,002,000) (74,298,000)  
Commitment fees on borrowings     800,000 300,000  
Amortization of deferred financing costs     325,000 257,000  
EEH Credit Agreement          
Debt Instrument [Line Items]          
Covenant terms, minimum current ratio   1.0      
Covenant terms, maximum leverage ratio   4.0      
Covenant terms, EBITDAX multiplier   4      
Current borrowing base under EEH credit agreement     275,000,000    
Long-term debt     78,800,000 25,000,000  
Additional borrowing base available under credit agreement     $ 196,200,000    
Amortization of deferred financing costs       $ 300,000  
EEH Credit Agreement | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 225,000,000.0 $ 185,000,000.0     $ 275,000,000.0
Reduction in basis points on interest rate for outstanding balance, percentage 0.50%        
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%      
Bold Transaction | Four Year Senior Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Repayments of borrowings   $ 10,000,000      
Earthstone Energy Credit Agreement          
Debt Instrument [Line Items]          
Averaged interest rate on outstanding debt     4.16% 4.26%  
Capitalized costs associated with borrowings     $ 500,000 $ 1,400,000  
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