Derivative Financial Instruments (Details 2) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Refining LLC \| Current Assets
Offsetting assets
Gross Assets	$ 104,100,000
Gross Amounts Offset	(2,200,000)
Net Assets Presented	101,900,000
Cash Collateral Not Offset	0
Net Amount	101,900,000
Refining LLC \| Noncurrent Assets
Offsetting assets
Gross Assets	8,200,000	900,000
Gross Amounts Offset	0	0
Net Assets Presented	8,200,000	900,000
Cash Collateral Not Offset	0	0
Net Amount	8,200,000	900,000
Refining LLC \| Current Liabilities
Offsetting liabilities
Gross Liabilities		74,200,000
Gross Amounts Offset		(6,500,000)
Net Liabilities Presented		67,700,000
Cash Collateral Not Offset		0
Net Amount		67,700,000
Commodity Swaps \| Refining LLC \| Current Assets
Offsetting assets
Gross Assets	104,100,000
Gross Amounts Offset	(2,200,000)
Net Assets Presented	101,900,000
Cash Collateral Not Offset	0
Net Amount	101,900,000
Commodity Swaps \| Refining LLC \| Noncurrent Assets
Offsetting assets
Gross Assets	8,200,000	900,000
Gross Amounts Offset	0	0
Net Assets Presented	8,200,000	900,000
Cash Collateral Not Offset	0	0
Net Amount	8,200,000	900,000
Commodity Swaps \| Refining LLC \| Current Liabilities
Offsetting liabilities
Gross Liabilities		74,200,000
Gross Amounts Offset		(6,500,000)
Net Liabilities Presented		67,700,000
Cash Collateral Not Offset		0
Net Amount		67,700,000
Interest Rate Swap
Offsetting liabilities
Gross Amounts Offset	$ 0	$ 0

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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