Properties and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Oil and Gas Property [Abstract]

Property, Plant and Equipment [Table Text Block]

The following table presents the components of properties and equipment, net of accumulated depreciation, depletion and amortization (“DD&A”), as of the dates indicated:

	December 31,
	2021		2020
	(in thousands)
Properties and equipment, net:
Crude oil and natural gas properties
Proved	$	8,310,018	$	7,523,639
Unproved	306,181		350,677
Total crude oil and natural gas properties	8,616,199		7,874,316
Equipment and other	63,099		65,027
Land and buildings	19,928		24,299
Construction in progress	371,968		523,550
Properties and equipment, at cost	9,071,194		8,487,192
Accumulated DD&A	(4,256,329)		(3,627,993)
Properties and equipment, net	$	4,814,865	$	4,859,199

Impairment of natural gas and crude oil properties [Table Text Block]

The following table presents impairment charges recorded for properties and equipment for the periods presented:

	Year Ended December 31,
	2021		2020		2019
	(in thousands)
Impairment of proved and unproved properties	$	402	$	881,238	$	10,599
Impairment of infrastructure and other	—		1,155		27,937
Total impairment of properties and equipment	$	402	$	882,393	$	38,536

Capitalized Exploratory Well Costs, Roll Forward

The following table presents the capitalized exploratory well cost pending determination of proved reserves and included in properties and equipment for the periods presented:

	Year Ended December 31,
	2021		2020		2019
	(in thousands, except for number of wells)
Beginning balance	$	7,459	$	16,078	$	12,188
Additions to capitalized exploratory well costs pending the determination of proved reserves	5,902		11,770		31,901
Reclassifications to proved properties	(13,361)		(20,389)		(28,011)
Ending balance	$	—	$	7,459	$	16,078
Number of wells pending determination at period-end	—		2		4