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	Sep. 30, 2012
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 59
Weighted average contract price per bbl	92.69
Sell (Short) Contracts [Member] | Crude Oil Swap [Member] [Domain]
Derivative [Line Items]
Contract volumes (1,000 bbls)	100
Weighted average contract price per bbl	18.63
Sell (Short) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	94
Weighted average contract price per gal	3.12
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	640
Weighted average contract price per bbl	97.59
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	360
Weighted average premium received	1.69
Sell (Short) Contracts [Member] | Heating Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	10
Weighted average premium received	0.08
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	25
Weighted average contract price per bbl	92.19
Buy (Long) Contracts [Member] | Crude Oil Swap [Member] [Domain]
Derivative [Line Items]
Contract volumes (1,000 bbls)	0
Weighted average contract price per bbl	0
Buy (Long) Contracts [Member] | Heating Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	66
Weighted average contract price per gal	3.16
Buy (Long) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	200
Weighted average contract price per bbl	98.05
Buy (Long) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	105
Weighted average premium received	0.54
Buy (Long) Contracts [Member] | Heating Oil Options [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 0
Weighted average premium received	0.00