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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Refining LLC
Offsetting assets
Gross Non-Current Assets	$ 1,463	$ 945
Gross Amounts Offset	(2)	(7)
Net Non-Current Assets Presented	1,461	938
Net Amount	1,461	938
Offsetting liabilities
Gross Current Liabilities	54,839	74,199
Gross Amounts Offset	(19,058)	(6,452)
Net Current Liabilities Presented	35,781	67,747
Cash Collateral Not Offset	(251)	(14)
Net Amount	35,530	67,733
Commodity Swaps | Refining LLC
Offsetting assets
Gross Non-Current Assets	1,463	945
Gross Amounts Offset	(2)	(7)
Net Non-Current Assets Presented	1,461	938
Net Amount	1,461	938
Offsetting liabilities
Gross Current Liabilities	54,588	74,178
Gross Amounts Offset	(19,058)	(6,445)
Net Current Liabilities Presented	35,530	67,733
Net Amount	35,530	67,733
Other Derivative Activity | Refining LLC
Offsetting liabilities
Gross Current Liabilities	251	21
Gross Amounts Offset		(7)
Net Current Liabilities Presented	251	14
Cash Collateral Not Offset	(251)	(14)
Interest rate swap
Offsetting liabilities
Gross Amounts Offset	$ 0	$ 0

X

- Definition

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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