Suspended Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2014

Extractive Industries [Abstract]

Suspended Exploratory Well Costs

The following table reflects the changes in capitalized exploratory well costs for the years ended December 31, 2014, 2013 and 2012 (in thousands, except for number of projects):

	2014			2013			2012
Balance at beginning of period	$	6,964		$	57,360		$	93,388
Additions to capitalized exploratory well costs pending the determination of proved reserves		18,747			39,832			153,250
Reclassifications to wells, facilities and equipment based on determination of proved reserves		(15,735	)		(84,840	)		(184,298	)
Divested wells		¾			¾			(4,980	)
Capitalized exploratory well costs charged to expense		(6,980	)		(5,388	)		—
Balance at end of period		2,996			6,964			57,360
Less exploratory well costs that have been capitalized for a period of one year or less		(2,996	)		¾			(45,965	)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	¾		$	6,964		$	11,395
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		¾			1			5