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Derivatives - Narrative (Details) bbl in Thousands	6 Months Ended
	Jun. 30, 2021 $ / bbl bbl	Dec. 31, 2020
Credit Derivatives [Line Items]
Derivative contracts, barrels | bbl	300
Average fixed interest rate		3.91%
5.00% Convertible Senior Notes due 2021
Credit Derivatives [Line Items]
Debt instrument, interest rate (in percent)		5.00%
5.00% Convertible Senior Notes due 2021 | Convertible Debt
Credit Derivatives [Line Items]
Debt instrument, interest rate (in percent)	5.00%
Option Collars
Credit Derivatives [Line Items]
Derivative contracts, barrels | bbl	25
Option Collar - Floor | Maximum
Credit Derivatives [Line Items]
Derivative, average price risk option strike price | $ / bbl	36.50
Option Collar - Ceiling | Maximum
Credit Derivatives [Line Items]
Derivative, average price risk option strike price | $ / bbl	60.00

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: 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=120391452&loc=d3e13212-122682

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

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options.

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Nominal volume used to calculate payments on a derivative instrument.

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