Suspended Exploratory Well Costs (Tables)

6 Months Ended

Jun. 30, 2013

	June 30, 2013			December 31, 2012
Balance at beginning of period	$	57,360		$	93,388
Additions to capitalized exploratory well costs pending the determination of proved reserves		41,405			153,250
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(66,221	)		(184,298	)
Divested wells		—			(4,980	)
Balance at end of period		32,544			57,360
Less exploratory well costs that have been capitalized for a period of one year or less		(12,025	)		(45,965	)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	20,519		$	11,395
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		8			5

Aging of Capitalized Exploratory Well Costs Suspended More Than One Year

	Total					2013									2012									2011									2010									2009									2008
Capitalized exploratory well costs that have been capitalized for more than one year	$		20,519			$		3,828					$				6,965					$				5,247					$				72					$				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