Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

As of December 31, 2020 and 2019, total property and equipment, net consisted of the following:


	As of December 31,
	2020	2019
Oil and natural gas properties, full cost accounting method	(In thousands)
Evaluated properties	$7,894,513	$7,203,482
Accumulated depreciation, depletion, amortization and impairments	(5,538,803)	(2,520,488)
Evaluated properties, net	2,355,710	4,682,994
Unevaluated properties
Unevaluated leasehold and seismic costs	1,532,304	1,843,725
Capitalized interest	200,946	142,399
Total unevaluated properties	1,733,250	1,986,124
Total oil and natural gas properties, net	$4,088,960	$6,669,118

Other property and equipment	$60,287	$67,202
Accumulated depreciation	(28,647)	(31,949)
Other property and equipment, net	$31,640	$35,253

Summary of Average Realized Price of Crude Oil

Details of the 12-Month Average Realized Price of crude oil for the years ended December 31, 2020, 2019, and 2018 are summarized in the table below:


	Years Ended December 31,
	2020		2019		2018
Impairment of evaluated oil and natural gas properties (In thousands)	$2,547,241		$—		$—
Beginning of period 12-Month Average Realized Price ($/Bbl)	$53.90		$58.40		$49.48
End of period 12-Month Average Realized Price ($/Bbl)	$37.44		$53.90		$58.40
Percent increase (decrease) in 12-Month Average Realized Price	(31	%)	(8	%)	18	%

The following average realized prices were used in the calculation of proved reserves and the standardized measure of discounted future net cash flows.


	Years Ended December 31,
	2020	2019	2018
Oil ($/Bbl)	$37.44	$53.90	$58.40
Natural gas ($/Mcf)	$1.02	$1.55	$3.64
NGLs ($/Bbl)	$11.10	$15.58	$—

Schedule of Capitalized Costs of Unproved Properties Excluded from Amortization

Unevaluated property costs not subject to amortization as of December 31, 2020 were incurred in the following periods:


	2020	2019	2018	2017 and Prior	Total
	(In thousands)
Unevaluated property costs	$113,078	$680,456	$439,478	$500,238	$1,733,250