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Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details) - NYMEX
Dec. 31, 2020
bbl / d
$ / Barrel
Swap | 2021  
Derivative [Line Items]  
Volume per day | bbl / d 26,000
Weighted average swap price 42.54
Swap | 2021 | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 38.68
Swap | 2021 | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 47.69
Swap | 2022 | Q1-Q2  
Derivative [Line Items]  
Volume per day | bbl / d 8,500
Weighted average swap price 43.55
Swap | 2022 | Q1-Q2 | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 42.65
Swap | 2022 | Q1-Q2 | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 45.50
Collar | 2021  
Derivative [Line Items]  
Volume per day | bbl / d 3,000
Weighted average floor price 45.00
Weighted average ceiling price 50.95
Collar | 2021 | Minimum  
Derivative [Line Items]  
Derivative, Floor Price 45.00
Collar | 2021 | Maximum  
Derivative [Line Items]  
Derivative, Cap Price 51.30