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Long-Term Debt (Details) - USD ($)
12 Months Ended
Sep. 28, 2020
Mar. 27, 2020
Nov. 21, 2019
Dec. 31, 2020
Dec. 31, 2019
May 31, 2024
May 31, 2023
Dec. 18, 2020
Dec. 17, 2020
Sep. 27, 2020
May 31, 2020
Mar. 26, 2020
Debt Instrument [Line Items]                        
Long-term debt       $ 115,000,000 $ 170,000,000              
Long-term debt, percentage bearing annual interest rate       2.40%                
Amount of borrowings       $ 136,100,000                
Repayments of borrowings       191,056,000 143,508,000              
Commitment fees on borrowings       600,000 700,000              
Amortization of deferred financing costs       322,000 412,000              
Interest Rate Swap                        
Debt Instrument [Line Items]                        
Derivative fixed rate                     0.286%  
Notional amount                     $ 125,000,000  
Interest Rate Swap | Forecast                        
Debt Instrument [Line Items]                        
Notional amount           $ 75,000,000 $ 100,000,000          
EEH Credit Agreement                        
Debt Instrument [Line Items]                        
Current borrowing base under EEH credit agreement $ 240,000,000 $ 275,000,000   240,000,000.0       $ 360,000,000.0 $ 240,000,000.0 $ 275,000,000   $ 325,000,000
Decrease in borrowing base rate   15.00%                    
Covenant terms, minimum current ratio     1.0                  
Covenant terms, maximum leverage ratio     3.5                  
Long-term debt       115,000,000.0 $ 170,000,000.0              
Additional borrowing base available under credit agreement       $ 125,000,000.0                
EEH Credit Agreement | Minimum                        
Debt Instrument [Line Items]                        
Increase in interest rate on outstanding borrowings 0.25%                      
Applicable margin percentage     1.00%                  
Commitment fee percentage     0.375%                  
EEH Credit Agreement | Maximum                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage 0.50%                      
Applicable margin percentage     2.25%                  
Commitment fee percentage     0.50%                  
EEH Credit Agreement | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Applicable margin percentage     1.00%                  
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                        
Debt Instrument [Line Items]                        
Applicable margin percentage     2.00%                  
EEH Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                        
Debt Instrument [Line Items]                        
Applicable margin percentage     3.25%                  
EEH Credit Agreement | Federal Funds Rate                        
Debt Instrument [Line Items]                        
Applicable margin percentage     0.50%                  
Earthstone Energy Credit Agreement                        
Debt Instrument [Line Items]                        
Averaged interest rate on outstanding debt       2.83% 4.42%              
Capitalized costs associated with borrowings       $ 0 $ 1,600,000