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, 2013
Sell (Short) Contracts [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 51
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	321
Weighted average contract price per bbl	94.64
Sell (Short) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Weighted average contract price per gal	2.85
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	532
Weighted average contract price per bbl	89.93
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	320
Weighted average premium received	1.43
Sell (Short) Contracts [Member] | Rbob Gasoline Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	10
Weighted average premium received	0.06
Buy (Long) Contracts [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	37
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	107
Weighted average contract price per bbl	95.99
Buy (Long) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Weighted average contract price per gal	2.86
Buy (Long) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	10
Weighted average contract price per bbl	92.00
Buy (Long) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	50
Weighted average premium received	0.30
Buy (Long) Contracts [Member] | Rbob Gasoline Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 0
Weighted average premium received	0