Derivatives - Narrative (Details) bbl in Thousands	6 Months Ended
Jun. 30, 2019 bbl
Credit Derivatives [Line Items]
Derivative contracts, barrels	509
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	737
Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,246
Long
Credit Derivatives [Line Items]
Derivative contracts, barrels	3,745
Long \| Future
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,045
Long \| Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels	2,700
Short
Credit Derivatives [Line Items]
Derivative contracts, barrels	4,254
Short \| Future
Credit Derivatives [Line Items]
Derivative contracts, barrels	308
Short \| Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels	3,946

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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