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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Gross Amounts   $ 114,000
Recurring Measurement Basis    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total Assets   114,000
Netting, assets   0
Recurring Measurement Basis | Commodity derivative contracts    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Netting, assets   0
Assets at Fair Value $ 0 114,000
Recurring Measurement Basis | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total Assets   0
Recurring Measurement Basis | Level 1 | Commodity derivative contracts    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Gross Amounts   0
Recurring Measurement Basis | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total Assets   114,000
Recurring Measurement Basis | Level 2 | Commodity derivative contracts    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Gross Amounts   114,000
Recurring Measurement Basis | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total Assets   0
Recurring Measurement Basis | Level 3 | Commodity derivative contracts    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Gross Amounts   $ 0