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Derivatives Narrative (Details) bbl in Thousands, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) bbl | Jul. 14, 2016 USD ($) | Jun. 27, 2016
Interest Rate Swap |  |  |
Credit Derivatives [Line Items] |  |  |
Fixed interest rate | 1.10% |  |
Notional amount | $ | $ 200 |  |
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 | 634 |  |
Long | Future | Over the Counter | Commodity Contract |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative contracts, barrels | 85 |  |
5% Convertible Senior Notes due 2021 | Convertible Debt |  |  |
Credit Derivatives [Line Items] |  |  |
Debt instrument, interest rate |  |  | 5.00%
Aggregate principal amount | $ |  | $ 115 |

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