Properties and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Components of Properties and Equipment, Net

Properties and equipment, net are comprised of the following:

	December 31,
(In thousands)	2020		2019
Proved oil and gas properties	$	7,068,605	$	6,508,443
Unproved oil and gas properties	49,829		133,475
Land, buildings and other equipment	92,566		104,700
	7,211,000		6,746,618
Accumulated depreciation, depletion and amortization	(3,166,394)		(2,890,912)
	$	4,044,606	$	3,855,706

Schedule of Net Changes in Capitalized Exploratory Well Costs

The following table reflects the net changes in capitalized exploratory well costs:

	Year Ended December 31,
(In thousands)	2020		2019		2018
Balance at beginning of period	$	—	$	—	$	19,511
Additions to capitalized exploratory well costs pending the determination of proved reserves	—		—		—
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves	—		—		—
Capitalized exploratory well costs charged to expense	—		—		(19,511)
Balance at end of period	$	—	$	—	$	—

Schedule of Aging of Capitalized Exploratory Well Costs

The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed:

	December 31,
(In thousands)	2020		2019		2018
Capitalized exploratory well costs that have been capitalized for a period of one year or less	$	—	$	—	$	—
Capitalized exploratory well costs that have been capitalized for a period greater than one year	—		—		—
	$	—	$	—	$	—