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Derivatives - Summary of Derivative Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
institution
Dec. 31, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain on derivative contracts $ (5,765) $ (1,094)
Cash received on settlements $ (5,879) (6,266)
Number of counterparties to open derivative contracts | institution 3  
Commodity Derivatives    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gain on derivative contracts $ (5,765) (1,094)
Cash received on settlements $ (5,879) $ (6,266)