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Derivatives - Narrative (Details) bbl in Thousands, $ in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2018 USD ($)	Sep. 30, 2018 USD ($) bbl
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%
Option Collars and Swap | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		15
Options Collar | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		60
Interest Rate Swap
Credit Derivatives [Line Items]
Fixed interest rate		0.97%
Notional amount | $	$ 100.0	$ 100.0
Loss on termination of derivative | $	$ 3.7
Long | Energy Related Derivative | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		181
Long | Option Collars and Swap | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		305
Short | Commodity derivatives | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		125
Short | Option Collars and Swap | Over the Counter
Credit Derivatives [Line Items]
Derivative contracts, barrels		250

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

Termination of Derivative Gain (Loss)

+ References

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- Definition

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+ References

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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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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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