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v3.19.1

Derivatives - Narrative (Details) bbl in Thousands | 3 Months Ended
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Mar. 31, 2019 bbl
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (212)
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 | (128)
Swap [Member] |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (340)
Long |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (7,041)
Long | Future |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (381)
Long | Swap [Member] |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (6,660)
Short |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (7,253)
Short | Future |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (253)
Short | Swap [Member] |
Credit Derivatives [Line Items] |
Derivative contracts, barrels | (7,000)

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