v2.4.0.6

Derivatives (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Estimated fair value of Company's commodity derivative instruments for cash collateral and associated cash as collateral
Net derivative asset position, Collateral paid	$ 151,939	$ 66,870	$ 43,191
Net derivative asset position, Fair value of derivatives	(106,629)	(20,480)	40,476
Net derivative asset position, net	45,310	46,390	83,667
Net derivative liability position, Collateral paid	0	0	0
Net derivative liability position, Fair value of derivatives	0	0	0
Net derivative liability position, net	$ 0	$ 0	$ 0

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Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

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Fair value of 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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Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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