(7) SUSPENDED EXPLORATORY WELL COSTS

We capitalize exploratory well costs until a determination is made that the well has either found proved reserves or that it is impaired. Capitalized exploratory well costs are presented in natural gas and oil properties in the accompanying consolidated balance sheets. If an exploratory well is determined to be impaired, the well costs are charged to exploration expense in the accompanying consolidated statements of operations. The following table reflects the changes in capitalized exploratory well costs for the six months ended June 30, 2014 and the year ended December 31, 2013 (in thousands except for number of projects):

	June 30, 2014			December 31, 2013
Balance at beginning of period	$	6,964		$	57,360
Additions to capitalized exploratory well costs pending the determination of proved reserves		44,472			39,832
Reclassifications to wells, facilities and equipment based on determination of proved reserves		—			(84,840	)
Capitalized exploratory well costs charged to expense		—			—
Divested wells		—			(5,388	)
Balance at end of period		51,436			6,964
Less exploratory well costs that have been capitalized for a period of one year or less		(44,472	)		—
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	6,964		$	6,964
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		1			1

As of June 30, 2014, $7.0 million of capitalized exploratory well costs have been capitalized for more than one year which relates to one well in our Marcellus Shale area where we are evaluating pipeline options. The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of June 30, 2014 (in thousands):

		Total				2013				2012				2011
Capitalized exploratory well costs that have been capitalized for more than one year		$	6,964			$	110			$	6,801			$	53