Supplemental Information on Oil and Natural Gas Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2021

Extractive Industries [Abstract]

Schedule of Aggregate Capitalized Costs Related to Oil and Natural Gas Production Activities

Oil and natural gas interests include the following:

	December 31,
	2021		2020
	(In thousands)
Oil and natural gas interests:
Subject to depletion	$	1,873,418	$	1,530,636
Not subject to depletion	1,640,172		1,364,906
Gross oil and natural gas interests	3,513,590		2,895,542
Accumulated depletion and impairment	(599,163)		(496,176)
Oil and natural gas interests, net	2,914,427		2,399,366
Land	5,688		5,688
Property, net of accumulated depletion and impairment	$	2,920,115	$	2,405,054
Balance of costs not subject to depletion:
Incurred in 2021	$	478,747
Incurred in 2020	55,041
Incurred in 2019	827,680
Incurred in 2018	278,704
Total not subject to depletion	$	1,640,172

Aggregate capitalized costs related to oil and natural gas production activities with applicable accumulated depreciation, depletion and amortization are as follows:

	December 31,
	2021		2020
	(In thousands)
Oil and natural gas interests:
Proved	$	1,873,418	$	1,530,636
Unproved	1,640,172		1,364,906
Total oil and natural gas interests	3,513,590		2,895,542
Accumulated depletion and impairment	(599,163)		(496,176)
Net oil and natural gas interests capitalized	$	2,914,427	$	2,399,366

Schedule of Cost Incurred in Oil and Gas Property Acquisition Activities

Costs incurred in oil and natural gas property acquisition activities are as follows:

	December 31,
	2021		2020		2019
	(In thousands)
Acquisition costs:
Proved properties	$	138,882	$	9,509	$	318,525
Unproved properties	479,041		56,169		833,221
Total	$	617,923	$	65,678	$	1,151,746

Schedule of Changes in Estimated Proved Reserves

The changes in estimated proved reserves are as follows:

	Oil (Bbls)	Natural Gas Liquids (Bbls)	Natural Gas (Mcf)
	(In thousands)
Proved Developed and Undeveloped Reserves:
As of December 31, 2018	41,878	10,992	61,597
Purchase of reserves in place	12,949	4,895	24,423
Extensions and discoveries	11,526	3,095	14,822
Revisions of previous estimates	(6,810)	1,041	2,589
Production	(5,123)	(1,459)	(7,657)
As of December 31, 2019	54,420	18,564	95,774
Purchase of reserves in place	491	113	507
Extensions and discoveries	15,415	4,424	23,982
Revisions of previous estimates	(6,685)	763	11,043
Divestitures	(155)	(63)	(370)
Production	(5,956)	(1,848)	(11,486)
As of December 31, 2020	57,530	21,953	119,450
Purchase of reserves in place	5,246	2,264	9,549
Extensions and discoveries	17,256	7,182	39,256
Revisions of previous estimates	(4,544)	(1,339)	29,788
Divestitures	(180)	(114)	(681)
Production	(6,068)	(1,913)	(13,672)
As of December 31, 2021	69,240	28,033	183,690
Proved Developed Reserves:
December 31, 2019	40,857	14,994	80,737
December 31, 2020	40,220	16,724	93,617
December 31, 2021	49,280	19,476	134,485
Proved Undeveloped Reserves:
December 31, 2019	13,563	3,570	15,037
December 31, 2020	17,310	5,229	25,833
December 31, 2021	19,960	8,557	49,205

Schedule of Standardized Measure of Discounted Future Net Cash Flows

The following table sets forth the standardized measure of discounted future net cash flows attributable to the Partnership’s proved oil and natural gas reserves as of December 31, 2021, 2020 and 2019:

	December 31,
	2021		2020		2019
	(In thousands)
Future cash inflows	$	5,763,433	$	2,460,052	$	3,218,257
Future production taxes	(416,761)		(181,067)		(237,181)
Future income tax expense	(572,991)		(22,993)		(150,373)
Future net cash flows	4,773,681		2,255,992		2,830,703
10% discount to reflect timing of cash flows	(2,680,564)		(1,232,398)		(1,512,315)
Standardized measure of discounted future net cash flows	$	2,093,117	$	1,023,594	$	1,318,388

Schedule of Average First-Day-of-the-Month Price for Oil, Natural Gas and Natural Gas Liquids

The following table presents the weighted average first-day-of–the-month prices for oil, natural gas and natural gas liquids utilized in the computation of future cash inflows:

	December 31,
	2021		2020		2019
Oil (per Bbl)	$	64.87	$	37.61	$	52.86
Natural gas (per Mcf)	$	2.97	$	0.34	$	0.51
Natural gas liquids (per Bbl)	$	25.93	$	11.65	$	15.79

Schedule of Principal Changes in Standardized Measure of Discounted Future Net Cash Flows

Principal changes in the standardized measure of discounted future net cash flows attributable to the Partnership’s proved reserves are as follows:

	December 31,
	2021		2020		2019
	(In thousands)
Standardized measure of discounted future net cash flows at the beginning of the period	$	1,023,594	$	1,318,388	$	1,139,382
Purchase of minerals in place	170,205		10,781		339,814
Divestiture of reserves	(4,402)		(3,481)		—
Sales of oil and natural gas, net of production costs	(468,976)		(227,137)		(274,735)
Extensions and discoveries	615,762		280,486		330,097
Net changes in prices and production costs	863,458		(465,582)		(301,182)
Revisions of previous quantity estimates	45,788		(87,614)		(114,409)
Net changes in income taxes	(243,186)		59,754		56,502
Accretion of discount	103,446		138,901		126,650
Net changes in timing of production and other	(12,572)		(902)		16,269
Standardized measure of discounted future net cash flows at the end of the period	$	2,093,117	$	1,023,594	$	1,318,388