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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

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- 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 No definition available. + 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. + Details
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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 + Details
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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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