Exploratory Costs (Tables)

9 Months Ended

Sep. 30, 2015

Schedule of Capitalized Exploratory Wells

The following table sets forth capitalized exploratory well costs and includes additions pending determination of proved reserves, reclassifications to proved reserves and costs charged to expense:



	Three months ended September 30,						Nine months ended September 30,
(in thousands)	2015			2014			2015			2014
Capitalized exploratory well costs at beginning of period	$	99,926		$	166,458		$	119,439		$	57,600
Additions pending determination of proved reserves	113,734			258,724			533,255			623,913
Reclassifications due to determination of proved reserves	(82,325		)	(258,123		)	(521,359		)	(513,263		)
Exploratory well costs charged to expense	—			(1,217		)	—			(2,408		)
Capitalized exploratory well costs at end of period	$	131,335		$	165,842		$	131,335		$	165,842

The following table sets forth capitalized exploratory well costs:



(in thousands)	September 30, 2015		December 31, 2014
Exploratory wells in progress (drilling rig not released)	$	14,161	$	18,781
Capitalized exploratory well costs capitalized for a period of one year or less	117,174		100,658
Total capitalized exploratory well costs	$	131,335	$	119,439