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 June 30,						Six months ended June 30,
(in thousands)	2014			2013			2014			2013
Capitalized exploratory well costs at beginning of period	$	109,968		$	106,175		$	57,600		$	79,791
Additions pending determination of proved reserves	200,347			123,719			365,189			219,580
Reclassifications due to determination of proved reserves	(142,666		)	(157,722		)	(255,140		)	(227,199		)
Exploratory well costs charged to expense	(1,191		)	—			(1,191		)	—
Capitalized exploratory well costs at end of period	$	166,458		$	72,172		$	166,458		$	72,172

The following table sets forth capitalized exploratory wells costs and includes amounts capitalized for a period greater than one year:



	Six months ended		Six months ended
(in thousands)	June 30, 2014		June 30, 2013
Exploratory wells in progress	$	35,753	$	25,728
Capitalized exploratory well costs capitalized for a period of one year or less	129,477		45,245
Capitalized exploratory well costs for a period greater than one year	1,228		1,199
Total capitalized exploratory well costs	$	166,458	$	72,172