Suspended Exploratory Well Costs

12 Months Ended

Dec. 31, 2018

(17)	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 years ended December 31, 2018, 2017 and 2016 (in thousands, except for number of projects):

	2018		2017			2016
Balance at beginning of period	$	—	$	7,412		$	4,161
Additions to capitalized exploratory well costs pending the determination of proved reserves		—		1,388			9,128
Reclassifications to wells, facilities and equipment based on determination of proved reserves		—		—			(5,877	)
Capitalized exploratory well costs charged to expense		—		(8,800	)		—
Balance at end of period		—		—			7,412
Less exploratory well costs that have been capitalized for a period of one year or less		—		—			(7,412	)
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$	—	$	—		$	—
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year		—		—			—