Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Termination of Derivative Gain (Loss)

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Balance Type:	na
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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Data Type:	num:volumeItemType
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Derivatives - Narrative (Details) bbl in Thousands	1 Months Ended	12 Months Ended
Derivatives - Narrative (Details) bbl in Thousands	Feb. 28, 2018 USD ($)	Dec. 31, 2018 USD ($) bbl	Dec. 31, 2016	Jun. 30, 2016 USD ($)
Credit Derivatives [Line Items]
Derivative contracts, barrels		(225)
Future
Credit Derivatives [Line Items]
Derivative contracts, barrels		(279)
Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels		(504)
Interest Rate Swap
Credit Derivatives [Line Items]
Fixed interest rate		0.97%
Notional amount \| $	$ 100,000,000	$ 100,000,000
Termination of derivative gain (loss) \| $	$ 3,700,000
Long
Credit Derivatives [Line Items]
Derivative contracts, barrels		(605)
Long \| Future
Credit Derivatives [Line Items]
Derivative contracts, barrels		(305)
Long \| Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels		(300)
Short
Credit Derivatives [Line Items]
Derivative contracts, barrels		(830)
Short \| Future
Credit Derivatives [Line Items]
Derivative contracts, barrels		(26)
Short \| Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels		(804)
5% Convertible Senior Notes due 2021
Credit Derivatives [Line Items]
Debt instrument, interest rate		5.00%		5.00%
5% Convertible Senior Notes due 2021 \| Convertible Debt
Credit Derivatives [Line Items]
Aggregate principal amount \| $				$ 115,000,000
Debt instrument, interest rate		5.00%	5.00%