Suspended Exploratory Well Costs (Tables)

6 Months Ended

Jun. 30, 2012

Suspended Exploratory Well Costs/Capitalized Costs and Accumulated Depreciation, Depletion and Amortization/Costs Incurred for Property Acquisition, Exploration and Development [Abstract]

Suspended Exploratory Well Costs

	June 30, 2012			December 31, 2011
Balance at beginning of period	$	93,388		$	23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves		150,136			86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(178,423	)		(17,516	)
Divested wells		(4,980	)		—
Capitalized exploratory well costs charged to expense		—			—
Balance at end of period		60,121			93,388
Less exploratory well costs that have been capitalized for a period of one year or less		(39,107	)		(83,860	)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	21,014		$	9,528
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		8			3

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

	Total		2012		2011		2010		2009		2008
Capitalized exploratory well costs that have been capitalized for more than one year	$	21,014	$	6,933	$	9,602	$	72	$	2,884	$	1,523