Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2022

Oil and Gas Property [Abstract]

Summary of Oil and Natural Gas Property Costs Not Being Amortized

The following table sets forth a summary of the Company’s oil and natural gas property costs not being amortized at December 31, 2022, by the year in which such costs were incurred (in thousands):

			Year Ended December 31,
	Total		2022		2021		2020		2019 and Prior
Acquisition United States	$	29,646	$	2,221	$	—	$	27,322	$	103
Exploration United States		13,707		2,696		4,727		1,753		4,531
Exploration Mexico		111,430		1,170		3,460		13,853		92,947
Total unproved properties, not subject to amortization	$	154,783	$	6,087	$	8,187	$	42,928	$	97,581

Schedule of Asset Retirement Obligations

The asset retirement obligations included in the Consolidated Balance Sheets in current and non-current liabilities, and the changes in that liability were as follows (in thousands):

	Year Ended December 31,
	2022			2021
Balance, beginning of period	$	434,006		$	442,269
Obligations acquired		—			433
Obligations incurred		1,140			52
Obligations settled		(69,596	)		(67,988	)
Obligations divested		(1,572	)		(340	)
Accretion expense		55,995			58,129
Changes in estimate(1)		121,688			1,451
Balance, end of period	$	541,661		$	434,006
Less: Current portion		39,888			60,311
Long-term portion	$	501,773		$	373,695

(1)Changes in estimate for the year ended December 31, 2022 were primarily due to an increase in estimated service costs.