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Derivatives - Narrative (Details) bbl in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) bbl | Sep. 30, 2016 | Jun. 30, 2016 USD ($)
Interest Rate Swap |  |  |
Credit Derivatives [Line Items] |  |  |
Fixed interest rate |  | 1.10% |
Notional amount | $ | $ 200,000,000 |  |
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 | 100 |  |
Long | Future | Over the Counter | Commodity Contract |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative contracts, barrels | 315 |  |
5% Convertible Senior Notes due 2021 | Convertible Debt |  |  |
Credit Derivatives [Line Items] |  |  |
Aggregate principal amount | $ |  |  | $ 115,000,000

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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 + Details
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