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Derivatives (Outstanding Derivatives Entered Into to Hedge Inventory or Fixed Price Purchase Commitments) (Details) bbl in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 bbl $ / bbl
Sell (Short) Contracts | Designated as Hedging Instrument [Member] | Futures [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 297
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 57.70
Sell (Short) Contracts | Not Designated As Hedging Instrument [Member] | Futures [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 223
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 56.86
Sell (Short) Contracts | Not Designated As Hedging Instrument [Member] | Futures [Member] | Fuel Oil Futures [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 260
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 55.01
Sell (Short) Contracts | Not Designated As Hedging Instrument [Member] | Options [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 80
Weighted average premium received (in dollars per barrel) | $ / bbl | 0.85
Buy (Long) Contracts | Designated as Hedging Instrument [Member] | Futures [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 0
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 0.00
Buy (Long) Contracts | Not Designated As Hedging Instrument [Member] | Futures [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 152
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 57.30
Buy (Long) Contracts | Not Designated As Hedging Instrument [Member] | Futures [Member] | Fuel Oil Futures [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 20
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 53.20
Buy (Long) Contracts | Not Designated As Hedging Instrument [Member] | Options [Member] | Crude Oil [Member] |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | bbl | 45
Weighted average premium received (in dollars per barrel) | $ / bbl | 0.24

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + 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 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 Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract but not the derivative contract itself. + References No definition available. + Details
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