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

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=34725769&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=6451184&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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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Derivatives Narrative (Details) bbl in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) bbl	Jul. 14, 2016 USD ($)	Jun. 27, 2016
Interest Rate Swap
Credit Derivatives [Line Items]
Fixed interest rate	1.10%
Notional amount \| $	$ 200
Forward Contracts \| Over the Counter \| Options Collar
Credit Derivatives [Line Items]
Derivative contracts, barrels	52
Forward Contracts \| Over the Counter \| Option Collars and Swap
Credit Derivatives [Line Items]
Derivative contracts, barrels	20
Long \| Future \| Over the Counter \| Energy Related Derivative
Credit Derivatives [Line Items]
Derivative contracts, barrels	634
Long \| Future \| Over the Counter \| Commodity Contract
Credit Derivatives [Line Items]
Derivative contracts, barrels	85
5% Convertible Senior Notes due 2021 \| Convertible Debt
Credit Derivatives [Line Items]
Debt instrument, interest rate			5.00%
Aggregate principal amount \| $		$ 115