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Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details) - NYMEX
Sep. 30, 2021
bbl / d
$ / Barrel
Swap | Q4 2021  
Derivative [Line Items]  
Volume per day | bbl / d 29,000
Weighted average swap price 43.86
Swap | Q4 2021 | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 38.68
Swap | Q4 2021 | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 56.00
Swap | Q1 - Q2 2022  
Derivative [Line Items]  
Volume per day | bbl / d 15,500
Weighted average swap price 49.01
Swap | Q1 - Q2 2022 | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 42.65
Swap | Q1 - Q2 2022 | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 58.15
Swap | Q3 - Q4 2022  
Derivative [Line Items]  
Volume per day | bbl / d 9,000
Weighted average swap price 56.35
Swap | Q3 - Q4 2022 | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 50.13
Swap | Q3 - Q4 2022 | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 60.35
Collars | Q4 2021  
Derivative [Line Items]  
Volume per day | bbl / d 4,000
Derivative, Floor Price 45.00
Derivative, Cap Price 59.30
Weighted average floor price 46.25
Weighted average ceiling price 53.04
Collars | Q1 - Q2 2022  
Derivative [Line Items]  
Volume per day | bbl / d 11,000
Derivative, Floor Price 47.50
Derivative, Cap Price 70.75
Weighted average floor price 49.77
Weighted average ceiling price 64.31
Collars | Q3 - Q4 2022  
Derivative [Line Items]  
Volume per day | bbl / d 10,000
Derivative, Floor Price 47.50
Derivative, Cap Price 70.75
Weighted average floor price 49.75
Weighted average ceiling price 64.18