Derivatives (Schedule Of Outstanding Derivatives Entered Into Hedge Inventory Or Fixed Price Purchase Commitments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 Selling Contracts [Member] Crude Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Selling Contracts [Member] Crude oil LLS/WTI swap [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Selling Contracts [Member] Heating Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Selling Contracts [Member] Fuel Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Selling Contracts [Member] Crude Oil Options [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Buying Contracts [Member] Crude Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Buying Contracts [Member] Crude oil LLS/WTI swap [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Buying Contracts [Member] Heating Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Buying Contracts [Member] Fuel Oil Futures [Member] Not Designated As Hedging Instrument [Member]	Dec. 31, 2012 Buying Contracts [Member] Crude Oil Options [Member] Not Designated As Hedging Instrument [Member]	Jul. 31, 2010 DG Marine [Member]
Derivative [Line Items]
Contract volumes (1,000 bbls)	$ 316	$ 100	$ 62	$ 765	$ 325	$ 199	$ 0	$ 0	$ 160	$ 85
Weighted average contract price per bbl	88.35	17.25		92.37		89.66	0.00		93.06
Weighted average contract price per gal			3.02					0.00
Weighted average contract price per mmBtu					1.61					0.55
Percentage of equity interest acquired											51.00%