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Subsequent Events	12 Months Ended
	Dec. 31, 2012
Subsequent Events	15. Subsequent Events Derivative instruments. In January 2013, the Company entered into new swaps and three-way costless collar options, all of which settle monthly based on the WTI crude oil index price, for a total notional amount of 334,000 barrels in 2013, 699,000 barrels in 2014 and 62,000 in 2015. These derivative instruments do not qualify for and were not designated as hedging instruments for accounting purposes.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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