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Commodity Derivative Contracts (Commodity Derivatives Outstanding Table) (Details) - Q3-Q4
Jun. 30, 2020
bbl / d
$ / Barrel
Derivative [Line Items]  
Volume per day | bbl / d 35,500
Swap | NYMEX  
Derivative [Line Items]  
Volume per day | bbl / d 13,500
Weighted average swap price 40.52
Swap | NYMEX | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 36.25
Swap | NYMEX | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 61.00
Swap | Argus LLS  
Derivative [Line Items]  
Volume per day | bbl / d 7,500
Weighted average swap price 51.67
Swap | Argus LLS | Minimum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 35.00
Swap | Argus LLS | Maximum  
Derivative [Line Items]  
Derivative, Swap Type, Fixed Price 64.26
Three-way Collar | NYMEX  
Derivative [Line Items]  
Volume per day | bbl / d 9,500
Weighted average sold put price 47.93
Weighted average floor price 57.00
Weighted average ceiling price 63.25
Three-way Collar | NYMEX | Minimum  
Derivative [Line Items]  
Derivative, Floor Price 55.00
Three-way Collar | NYMEX | Maximum  
Derivative [Line Items]  
Derivative, Cap Price 82.65
Three-way Collar | Argus LLS  
Derivative [Line Items]  
Volume per day | bbl / d 5,000
Weighted average sold put price 52.80
Weighted average floor price 61.63
Weighted average ceiling price 70.35
Three-way Collar | Argus LLS | Minimum  
Derivative [Line Items]  
Derivative, Floor Price 58.00
Three-way Collar | Argus LLS | Maximum  
Derivative [Line Items]  
Derivative, Cap Price 87.10