Derivatives (Schedule Of Outstanding Derivatives Entered Into To Hedge Inventory Or Fixed Price Purchase Commitments) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 157
Weighted average contract price per bbl	89.58
Sell (Short) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	25
Weighted average contract price per gal	2.56
Sell (Short) Contracts [Member] | RBOB Gasoline Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	12
Weighted average contract price per gal	2.49
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	555
Weighted average contract price per bbl	87.00
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	285
Weighted average premium received	2.04
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	81
Weighted average contract price per bbl	90.88
Buy (Long) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	0
Weighted average contract price per gal	0.00
Buy (Long) Contracts [Member] | RBOB Gasoline Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	0
Weighted average contract price per gal	0.00
Buy (Long) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	145
Weighted average contract price per bbl	88.15
Buy (Long) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 70
Weighted average premium received	1.12