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Derivatives - Narrative (Details) bbl in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) bbl	Dec. 31, 2016	Jun. 30, 2016 USD ($)
Options Collar | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels	60
Options Collars and Swaps | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels	15
Interest Rate Swap
Credit Derivatives [Line Items]
Fixed interest rate	1.10%
Notional amount | $	$ 200,000,000
Long | Commodity Contract | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels	200
Long | Energy Related Derivative | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels	321
Long | Options Collars and Swaps | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels	140
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%	0.50%

X

- Definition

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

+ References

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

+ Details

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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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X

- 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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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ 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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