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Suspended Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2011

Suspended Exploratory Well Costs [Abstract]


	2011			2010			2009
Balance at beginning of period	$	23,908		$	19,052		$	47,623
Additions to capitalized exploratory well costs pending the determination of proved reserves		86,996			28,897			26,216
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(17,516	)		(24,041	)		(52,849	)
Capitalized exploratory well costs charged to expense		—			—			(1,938	)

Balance at end of period		93,388			23,908			19,052
Less exploratory well costs that have been capitalized for a period of one year or less		(83,860	)		(13,181	)		(10,778	)

Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	9,528		$	10,727		$	8,274

Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		3			4			6

Aging of capitalized exploratory well costs that have been suspended for more than one year


	Total		2011		2010		2009		2008
Capitalized exploratory well costs that have been capitalized for more than one year	$	9,528	$	414	$	4,707	$	2,884	$	1,523

- Definition

Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate.

+ References+ Details