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Subsequent Events, Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details) - Crude Oil
Apr. 23, 2019
bbl / d
$ / bbls
Apr. 22, 2019
bbl / d
$ / bbls
Mar. 31, 2019
bbl / d
$ / bbls
Three-way Collars | 2Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d     27,000
Weighted Average Sub-Floor Price ($/Bbl)     41.67
Weighted Average Floor Price ($/Bbl)     50.96
Weighted Average Ceiling Price ($/Bbl)     74.23
Three-way Collars | 3Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d     27,000
Weighted Average Sub-Floor Price ($/Bbl)     41.67
Weighted Average Floor Price ($/Bbl)     50.96
Weighted Average Ceiling Price ($/Bbl)     74.23
Three-way Collars | 4Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d     27,000
Weighted Average Sub-Floor Price ($/Bbl)     41.67
Weighted Average Floor Price ($/Bbl)     50.96
Weighted Average Ceiling Price ($/Bbl)     74.23
Three-way Collars | FY 2020      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d     6,000
Weighted Average Sub-Floor Price ($/Bbl)     45.00
Weighted Average Floor Price ($/Bbl)     55.00
Weighted Average Ceiling Price ($/Bbl)     64.69
Fixed Price Swaps | FY 2020      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d     3,000
Derivative, Swap Type, Fixed Price     55.06
Subsequent Event [Member] | Three-way Collars | FY 2020      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d 6,000    
Weighted Average Sub-Floor Price ($/Bbl) 46.25    
Weighted Average Floor Price ($/Bbl) 56.25    
Weighted Average Ceiling Price ($/Bbl) 67.39    
Subsequent Event [Member] | Fixed Price Swaps | 2Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d   3,352  
Derivative, Swap Type, Fixed Price   64.80  
Subsequent Event [Member] | Fixed Price Swaps | 3Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d   5,000  
Derivative, Swap Type, Fixed Price   64.80  
Subsequent Event [Member] | Fixed Price Swaps | 4Q 2019      
Derivative [Line Items]      
Derivative, Volumes (in Bbl/d) | bbl / d   5,000  
Derivative, Swap Type, Fixed Price   64.80