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	Mar. 31, 2013
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 339
Weighted average contract price per bbl	91.71
Sell (Short) Contracts [Member] | Crude oil LLSWTI swap [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	20
Weighted average contract price per bbl	17.60
Sell (Short) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	60
Weighted average contract price per gal	2.99
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	613
Weighted average contract price per bbl	95.08
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	250
Weighted average premium received	1.41
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	159
Weighted average contract price per bbl	93.38
Buy (Long) Contracts [Member] | Crude oil LLSWTI swap [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	40
Weighted average contract price per bbl	16.38
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] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	0
Weighted average contract price per bbl	0.00
Buy (Long) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 60
Weighted average premium received	0.25