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Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events	Subsequent Events Divestiture. In January 2014, the Company executed a purchase and sale agreement for the sale of certain non-operated properties in its Sanish project area and other non-operated leases adjacent to its Sanish position for approximately $333.0 million, subject to customary post-close adjustments. The sale is expected to close during the first quarter of 2014. Derivative instruments. In February 2014, the Company entered into new swap agreements for a total notional amounts of 1,100,000 barrels, 1,516,000 barrels and 62,000 barrels, which settle in 2014, 2015 and 2016, respectively, based on the WTI crude oil index price. 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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