v2.4.0.6

Exploratory Well Costs (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Exploratory Well Costs [Abstract]
Balance at December 31, 2012	$ 49,116,000
Additions Pending the Determination of Proved Reserves	51,797,000
Reclassifications to Proved Properties	0
Costs Charged to Expense (1)	(1,616,000)
Foreign Currency Translations	(1,546,000)
Balance at March 31, 2013	97,751,000
Capitalized exploratory well costs that have been capitalized for a period less than one year	70,633,000
Capitalized exploratory well costs that have been capitalized for a period greater than one year	27,118,000
Number of exploratory wells that have been capitalized for a period greater than one year	2
Exploratory well costs related to an outside operated, offshore Central North Sea project in the United Kingdom	19,000,000
Exploratory well costs related to a project in Central Alberta, Canada	$ 8,000,000

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- Definition

Additions or deductions to capitalized exploratory well costs that resulted from changes in foreign currency exchange rates.

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The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling related to an outside operated, offshore Central North Sea project in the United Kingdom

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The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling related to a project in Central Alberta, Canada..

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Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.

+ References

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Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well.

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The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.

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The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

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The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling.

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- Definition

Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.

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