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Derivatives (Outstanding Derivatives Entered Into to Hedge Inventory or Fixed Price Purchase Commitments) (Details) bbl in Thousands | 12 Months Ended
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Dec. 31, 2018 bbl $ / bbl $ / units
Sell (Short) Contracts | Designated as hedges under accounting rules | Futures | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 56
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 53.11
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 293
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 49.85
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Natural Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 137
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 3.53
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Diesel |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 2
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 1.89
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | RBOB Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 2
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 1.35
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Fuel Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 382
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 51.41
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Swap | Natural Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 502
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 0.62
Sell (Short) Contracts | Not qualifying or not designated as hedges under accounting rules | Options | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 26
Weighted average premium received (in dollars per barrel) | $ / bbl | 2.66
Buy (Long) Contracts | Designated as hedges under accounting rules | Futures | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 0
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 0.00
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 234
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 49.37
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Natural Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 590
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 2.91
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Diesel |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 2
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 1.85
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | RBOB Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 1
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 1.29
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Futures | Fuel Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 40
Weighted average contract price per bbl (in dollars per barrel) | $ / bbl | 49.94
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Swap | Natural Gas |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 0
Weighted average contract price per bbl (in dollars per barrel) | $ / units | 0.00
Buy (Long) Contracts | Not qualifying or not designated as hedges under accounting rules | Options | Crude Oil |
Derivative [Line Items] |
Contract volumes (1,000 bbls) | 0
Weighted average premium received (in dollars per barrel) | $ / bbl | 0.00

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