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Derivatives - Narrative (Details)
bbl in Thousands
9 Months Ended
Sep. 30, 2019
$ / bbl
bbl
Credit Derivatives [Line Items]  
Derivative contracts, barrels 864
Average fixed interest rate 3.91%
5.00% Convertible Senior Notes due 2021  
Credit Derivatives [Line Items]  
Debt instrument, interest rate 5.00%
5.00% Convertible Senior Notes due 2021 | Convertible Debt  
Credit Derivatives [Line Items]  
Debt instrument, interest rate 5.00%
Future  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 864
Swap  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 0
Option Collars  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 50
Long  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 2,118
Long | Future  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 1,980
Long | Swap  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 138
Short  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 1,254
Short | Future  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 1,116
Short | Swap  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 138
Minimum | Option Collars  
Credit Derivatives [Line Items]  
Derivative, average price risk option strike price | $ / bbl 48.40
Maximum | Option Collars  
Credit Derivatives [Line Items]  
Derivative, average price risk option strike price | $ / bbl 65.00