Suspended Exploratory Well Costs (Tables)

12 Months Ended

Dec. 31, 2018

Extractive Industries [Abstract]

Suspended Exploratory Well Costs

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		—		—			—