Exploratory Costs (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in thousands)	2015			2014
Capitalized exploratory well costs at beginning of period	$	119,439		$	57,600
Additions pending determination of proved reserves	230,061			164,842
Reclassifications due to determination of proved reserves	(234,291		)	(112,474		)
Capitalized exploratory well costs at end of period	$	115,209		$	109,968

The following table sets forth capitalized exploratory well costs:



(in thousands)	March 31, 2015		December 31, 2014
Exploratory wells in progress (drilling rig not released)	$	13,063	$	18,781
Capitalized exploratory well costs capitalized for a period of one year or less	102,146		100,658
Total capitalized exploratory well costs	$	115,209	$	119,439