Natural Resource Partners (NRP) 10-Q 4 Aug 22 2022 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2022	Aug. 01, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-31465
Entity Registrant Name	NATURAL RESOURCE PARTNERS LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	35-2164875
Entity Address, Address Line One	415 Louisiana Street, Suite 2400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	751-7507
Title of 12(b) Security	Common Units representing limited partner interests
Trading Symbol	NRP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,505,996
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001171486
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 59,356	$ 135,520
Accounts receivable, net	37,288	24,538
Other current assets, net	3,204	2,723
Total current assets	99,848	162,781
Land	24,008	24,008
Mineral rights, net	428,505	437,697
Intangible assets, net	15,634	16,130
Equity in unconsolidated investment	280,300	276,004
Long-term contract receivable, net	30,182	31,371
Other long-term assets, net	4,664	5,832
Total assets	883,141	953,823
Current liabilities
Accounts payable	1,969	1,956
Accrued liabilities	5,507	10,297
Accrued interest	1,050	1,213
Current portion of deferred revenue	11,475	11,817
Current portion of long-term debt, net	39,070	39,102
Total current liabilities	59,071	64,385
Deferred revenue	40,811	50,045
Long-term debt, net	259,296	394,443
Other non-current liabilities	5,012	5,018
Total liabilities	364,190	513,891
Commitments and contingencies (see Note 12)
Class A Convertible Preferred Units (250,000 and 269,321 units issued and outstanding at June 30, 2022 and December 31, 2021, respectively, at $1,000 par value per unit; liquidation preference of $1,850 per unit at June 30, 2022 and December 31, 2021)	164,587	183,908
Partners’ capital
Common unitholders’ interest (12,505,996 and 12,351,306 units issued and outstanding at June 30, 2022 and December 31, 2021, respectively)	300,753	203,062
General partner’s interest	3,904	1,787
Warrant holders’ interest	47,964	47,964
Accumulated other comprehensive income	1,743	3,211
Total partners’ capital	354,364	256,024
Total liabilities and partners' capital	$ 883,141	$ 953,823
Preferred units outstanding (in shares)	250,000	269,321
Preferred units issued (in shares)	250,000	269,321

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred units issued (in shares)	250,000	269,321
Preferred units outstanding (in shares)	250,000	269,321
Preferred unit par value per unit	$ 1,000	$ 1,000
Preferred unit liquidation preference per unit	$ 1,850	$ 1,850
Common units issued (in shares)	12,505,996	12,351,306
Common units outstanding (in shares)	12,505,996	12,351,306

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 99,588	$ 38,394		$ 189,304	$ 75,486
Gain on asset sales and disposals	345	116		345	175
Total revenues and other income	99,933	38,510		189,649	75,661
Operating expenses
Operating and maintenance expenses	10,015	5,170		18,091	10,722
Depreciation, depletion and amortization	5,847	4,871		9,715	9,963
General and administrative expenses	5,052	3,388		9,519	7,498
Asset impairments	43	16		62	4,059
Total operating expenses	20,957	13,445		37,387	32,242
Income from operations	78,976	25,065		152,262	43,419
Interest expense, net	(8,108)	(9,683)		(17,495)	(19,656)
Loss on extinguishment of debt	(4,048)	0		(4,048)	0
Other Expenses	(12,156)	(9,683)		(21,543)	(19,656)
Net income	66,820	15,382	[1]	130,719	23,763
Less: income attributable to preferred unitholders	(7,500)	(7,842)		(15,000)	(15,569)
Net income attributable to common unitholders and the general partner	59,320	7,540		115,719	8,194
Net income attributable to common unitholders	58,134	7,389		113,405	8,030
Net income attributable to the general partner	$ 1,186	$ 151		$ 2,314	$ 164
Net income per common unit (see Note 4)
Basic (in dollars per share)	$ 4.65	$ 0.60		$ 9.10	$ 0.65
Diluted (in dollars per unit)	$ 3.29	$ 0.56		$ 6.50	$ 0.65
Comprehensive income (loss) from unconsolidated investment and other	$ (4,013)	$ 2,533		$ (1,468)	$ 3,265
Comprehensive income	62,807	17,915		129,251	27,028
Mineral Rights
Revenues	84,945	35,793		159,824	70,912
Soda Ash
Revenues	14,643	2,601		29,480	4,574
Royalty and other mineral rights | Mineral Rights
Revenues	79,333	33,611		150,416	66,538
Transportation and processing services | Mineral Rights
Revenues	$ 5,612	$ 2,182		$ 9,408	$ 4,374
[1]Net income includes $7.7 million of income attributable to preferred unitholders that accumulated during the period, of which $7.6 million is allocated to the common unitholders and $0.2 million is allocated to the general partner. (2) Net income includes $7.8 million of income attributable to preferred unitholders that accumulated during the period, of which $7.7 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.

Consolidated Statements of Part

Consolidated Statements of Partners' Capital - USD ($) shares in Thousands, $ in Thousands		Total	General Partner	Common Unitholders	Warrant Holders	Accumulated Other Comprehensive Income	Common Unitholders	Common Unitholders Common Unitholders	Common unitholders and general partner	General Partner	General Partner General Partner	Preferred Partner	Preferred Partner General Partner	Preferred Partner Common Unitholders
Balance, beginning of period (in shares) at Dec. 31, 2020				12,261
Balance, beginning of period at Dec. 31, 2020		$ 204,524	$ 459	$ 136,927	$ 66,816	$ 322
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income attributable to NRP			168	$ 8,213
Net income	[1]	8,381
Distributions to unitholders								$ (5,517)	$ (5,630)		$ (113)	$ (7,613)	$ (152)	$ (7,461)
Issuance of unit-based awards (units)				90
Issuance of unit-based awards		0
Unit-based awards amortization and vesting, net		215		$ 215
Partners' Capital Account, Contributions		32											32
Comprehensive income from unconsolidated investment and other		732				732
Balance, end of period (in shares) at Mar. 31, 2021				12,351
Balance, end of period at Mar. 31, 2021		200,641	394	$ 132,377	66,816	1,054
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		7,700					$ 7,600			$ 200
Balance, beginning of period (in shares) at Dec. 31, 2020				12,261
Balance, beginning of period at Dec. 31, 2020		204,524	459	$ 136,927	66,816	322
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		23,763
Balance, end of period (in shares) at Jun. 30, 2021				12,351
Balance, end of period at Jun. 30, 2021		205,673	434	$ 134,836	66,816	3,587
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		15,569
Balance, beginning of period (in shares) at Mar. 31, 2021				12,351
Balance, beginning of period at Mar. 31, 2021		200,641	394	$ 132,377	66,816	1,054
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income attributable to NRP			308	15,074
Net income	[1]	15,382
Distributions to unitholders								(5,559)	(5,672)		(113)	(7,726)	(155)	(7,571)
Unit-based awards amortization and vesting, net		515		$ 515
Comprehensive income from unconsolidated investment and other		2,533				2,533
Balance, end of period (in shares) at Jun. 30, 2021				12,351
Balance, end of period at Jun. 30, 2021		205,673	434	$ 134,836	66,816	3,587
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		7,842					7,700			200
Balance, beginning of period (in shares) at Dec. 31, 2021				12,351
Balance, beginning of period at Dec. 31, 2021		256,024	1,787	$ 203,062	47,964	3,211
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income attributable to NRP			1,278	$ 62,621
Net income	[2]	63,899
Distributions to unitholders								(5,559)	(5,672)		(113)	(7,758)	(155)	(7,603)
Issuance of unit-based awards (units)				155
Issuance of unit-based awards		0
Unit-based awards amortization and vesting, net		(1,754)		$ (1,754)
Partners' Capital Account, Contributions		112											112
Comprehensive income from unconsolidated investment and other		2,545				2,545
Balance, end of period (in shares) at Mar. 31, 2022				12,506
Balance, end of period at Mar. 31, 2022		307,396	2,909	$ 250,767	47,964	5,756
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		7,500					7,400			200
Balance, beginning of period (in shares) at Dec. 31, 2021				12,351
Balance, beginning of period at Dec. 31, 2021		256,024	1,787	$ 203,062	47,964	3,211
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		130,719
Balance, end of period (in shares) at Jun. 30, 2022				12,506
Balance, end of period at Jun. 30, 2022		354,364	3,904	$ 300,753	47,964	1,743
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		15,000
Balance, beginning of period (in shares) at Mar. 31, 2022				12,506
Balance, beginning of period at Mar. 31, 2022		307,396	2,909	$ 250,767	47,964	5,756
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income attributable to NRP	[2]		1,336	65,484
Net income		66,820
Distributions to unitholders								$ (9,379)	$ (9,570)		$ (191)	$ (7,500)	$ (150)	$ (7,350)
Unit-based awards amortization and vesting, net		1,231		$ 1,231
Comprehensive income from unconsolidated investment and other		(4,013)				(4,013)
Balance, end of period (in shares) at Jun. 30, 2022				12,506
Balance, end of period at Jun. 30, 2022		354,364	$ 3,904	$ 300,753	$ 47,964	$ 1,743
Increase (Decrease) in Partners' Capital [Roll Forward]
Income attributable to preferred unitholders		$ 7,500					$ 7,400			$ 200
[1]Net income includes $7.7 million of income attributable to preferred unitholders that accumulated during the period, of which $7.6 million is allocated to the common unitholders and $0.2 million is allocated to the general partner. (2) Net income includes $7.8 million of income attributable to preferred unitholders that accumulated during the period, of which $7.7 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income	$ 130,719	$ 23,763
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Depreciation, depletion and amortization	9,715	9,963
Distributions from unconsolidated investment	23,716	3,920
Equity earnings from unconsolidated investment	(29,480)	(4,574)
Gain on asset sales and disposals	(345)	(175)
Loss on extinguishment of debt	4,048	0
Asset impairments	62	4,059
Bad debt expense	640	(354)
Unit-based compensation expense	2,787	1,719
Amortization of debt issuance costs and other	1,672	1,246
Change in operating assets and liabilities:
Accounts receivable	(12,612)	(3,169)
Accounts payable	13	(93)
Accrued liabilities	(5,109)	(1,196)
Accrued interest	(163)	(291)
Deferred revenue	(9,575)	531
Other items, net	(634)	1,235
Net cash provided by operating activities	115,454	36,584
Cash flows from investing activities
Proceeds from asset sales and disposals	346	175
Return of long-term contract receivable	563	1,082
Net cash provided by investing activities	909	1,257
Cash flows from financing activities
Debt repayments	(137,171)	(19,061)
Redemption of preferred units paid-in-kind	(19,579)	0
Acquisition of non-controlling interest in BRP	0	(1,000)
Other items, net	(5,535)	(690)
Net cash used in financing activities	(192,527)	(39,723)
Net decrease in cash and cash equivalents	(76,164)	(1,882)
Cash and cash equivalents at beginning of period	135,520	99,790
Cash and cash equivalents at end of period	59,356	97,908
Supplemental cash flow information:
Cash paid for interest	16,772	18,931
Non-cash investing and financing activities:
Preferred unit distributions paid-in-kind	0	7,669
General Partner
Cash flows from financing activities
Distributions to common unitholders and the general partner	(15,242)	(11,302)
Preferred Partner
Cash flows from financing activities
Distributions to common unitholders and the general partner	$ (15,000)	$ (7,670)

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Nature of Business Natural Resource Partners L.P. (the "Partnership") engages principally in the business of owning, managing and leasing a diversified portfolio of mineral properties in the United States, including interests in coal and other natural resources and owns a non-controlling 49% interest in Sisecam Wyoming LLC ("Sisecam Wyoming"), a trona ore mining and soda ash production business. The Partnership is organized into two operating segments further described in Note 5. Segment Information . As used in these Notes to Consolidated Financial Statements, the terms "NRP," "we," "us" and "our" refer to Natural Resource Partners L.P. and its subsidiaries, unless otherwise stated or indicated by context. Principles of Consolidation and Reporting

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenues from Contracts with Customers The following table presents the Partnership's Mineral Rights segment revenues by major source: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Coal royalty revenues $ 62,945 $ 18,298 $ 118,394 $ 33,663 Production lease minimum revenues 65 3,556 1,657 7,006 Minimum lease straight-line revenues 4,674 4,869 9,457 10,965 Property tax revenues 1,695 1,587 3,167 3,056 Wheelage revenues 4,379 1,844 8,096 3,625 Coal overriding royalty revenues 682 976 940 2,835 Lease amendment revenues 811 772 1,691 1,640 Aggregates royalty revenues 1,037 456 1,807 910 Oil and gas royalty revenues 2,906 900 4,720 2,266 Other revenues 139 353 487 572 Royalty and other mineral rights revenues $ 79,333 $ 33,611 $ 150,416 $ 66,538 Transportation and processing services revenues (1) 5,612 2,182 9,408 4,374 Total Mineral Rights segment revenues $ 84,945 $ 35,793 $ 159,824 $ 70,912 (1) Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $4.9 million and $1.2 million for the three months ended June 30, 2022 and 2021, respectively, and $8.0 million and $2.5 million for the six months ended June 30, 2022 and 2021, respectively. The remaining transportation and processing services revenues of $0.7 million and $0.9 million for the three months ended June 30, 2022 and 2021, respectively, and $1.4 million and $1.9 million for the six months ended June 30, 2022 and 2021, respectively, related to other NRP-owned infrastructure leased to and operated by third-party operators accounted for under other guidance. See Note 14. Financing Trans action for more information. The following table details the Partnership's Mineral Rights segment receivables and liabilities resulting from contracts with customers: June 30, December 31, (In thousands) 2022 2021 Receivables Accounts receivable, net $ 33,629 $ 22,277 Other current assets, net (1) 1,861 769 Other long-term assets, net (2) 75 250 Contract liabilities Current portion of deferred revenue $ 11,475 $ 11,817 Deferred revenue 40,811 50,045 (1) Other current assets, net includes short-term notes receivables from contracts with customers. (2) Other long-term assets, net includes long-term lease amendment fee receivables from contracts with customers. The following table shows the activity related to the Partnership's Mineral Rights segment deferred revenue: For the Six Months Ended (In thousands) 2022 2021 Balance at beginning of period (current and non-current) $ 61,862 $ 61,554 Increase due to minimums and lease amendment fees 7,997 7,938 Recognition of previously deferred revenue (17,573) (7,406) Balance at end of period (current and non-current) $ 52,286 $ 62,086 The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty leases are as follows as of June 30, 2022 (in thousands): Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 2.5 $ 20,754 5 - 10 years 4.1 7,500 10+ years 13.1 26,610 Total 7.9 $ 54,864 (1) Lease term does not include renewal periods.

Common and Preferred Unit Distr

Common and Preferred Unit Distributions	6 Months Ended
	Jun. 30, 2022
Equity [Abstract]
Common and Preferred Unit Distributions	Common and Preferred Unit Distributions The Partnership makes cash distributions to common and preferred unitholders on a quarterly basis, subject to approval by the Board of Directors of GP Natural Resource Partners LLC (the "Board of Directors"). NRP recognizes both common unit and preferred unit distributions on the date the distribution is declared. Distributions made on the common units and the general partner's general partner ("GP") interest are made on a pro-rata basis in accordance with their relative percentage interests in the Partnership. The general partner is entitled to receive 2% of such distributions. Income available to common unitholders and the general partner is reduced by preferred unit distributions that accumulated during the period. NRP reduced net income available to common unitholders and the general partner by $7.5 million and $7.8 million during the three months ended June 30, 2022 and 2021, respectively and $15.0 million and $15.6 million during the six months ended June 30, 2022 and 2021, respectively, as a result of accumulated preferred unit distributions earned during the period. The following table shows the cash distributions declared and paid to common and preferred unitholders during the six months ended June 30, 2022 and 2021, respectively: Cash Distributions Paid-in-kind Distributions Common Units Preferred Units Month Paid Period Covered by Distribution Distribution per Unit Total Distribution (1) (In thousands) Distribution per Unit Total Distribution Total Distribution 2022 February 2022 October 1 - December 31, 2021 $ 0.45 $ 5,672 $ 30.00 $ 7,500 — May 2022 January 1 - March 31, 2022 0.75 9,570 30.00 7,500 — 2021 February 2021 October 1 - December 31, 2020 $ 0.45 $ 5,630 $ 15.00 $ 3,806 3,806 May 2021 January 1 - March 31, 2021 0.45 5,672 15.00 3,864 3,864 (1) Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

Net Income Per Common Unit

Net Income Per Common Unit	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Net Income Per Common Unit	Net Income Per Common Unit Basic net income per common unit is computed by dividing net income, after considering income attributable to preferred unitholders and the general partner’s general partner interest, by the weighted average number of common units outstanding. Diluted net income per common unit includes the effect of NRP's preferred units, warrants, and unvested unit-based awards if the inclusion of these items is dilutive. The dilutive effect of the preferred units is calculated using the if-converted method. Under the if-converted method, the preferred units are assumed to be converted at the beginning of the period, and the resulting common units are included in the denominator of the diluted net income per unit calculation for the period being presented. Distributions declared in the period and undeclared distributions on the preferred units that accumulated during the period are added back to the numerator for purposes of the if-converted calculation. The calculation of diluted net income per common unit for the three months ended June 30, 2022 and 2021 and the six months ended June 30, 2022 includes the assumed conversion of the preferred units. The calculation of diluted net income per common unit for the six months ended June 30, 2021 does not include the assumed conversion of the preferred units because the impact would have been anti-dilutive. The dilutive effect of the warrants is calculated using the treasury stock method, which assumes that the proceeds from the exercise of these instruments are used to purchase common units at the average market price for the period. The calculation of diluted net income per common unit for the three and six months ended June 30, 2022 includes the net settlement of warrants to purchase 0.75 million co mmon units at a strike price of $22.81 and the net settlement of warrants to purchase 2.25 million common units with a strike price of $34.00 whereas the calculation of diluted net income per common unit for the three and six months ended June 30, 2021 does not include the net settlement of warrants to purchase 1.75 million common units at a strike price of $22.81 or the net settlement of warrants to purchase 2.25 million common units with a strike price of $34.00 because the impact would have been anti-dilutive. The following tables reconcile the numerator and denominator of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit: For the Three Months Ended For the Six Months Ended June 30, (In thousands, except per unit data) 2022 2021 2022 2021 Allocation of net income Net income $ 66,820 $ 15,382 $ 130,719 $ 23,763 Less: income attributable to preferred unitholders (7,500) (7,842) (15,000) (15,569) Net income attributable to common unitholders and the general partner $ 59,320 $ 7,540 $ 115,719 $ 8,194 Less: net income attributable to the general partner (1,186) (151) (2,314) (164) Net income attributable to common unitholders $ 58,134 $ 7,389 $ 113,405 $ 8,030 Basic net income per common unit Weighted average common units—basic 12,506 12,351 12,461 12,322 Basic net income per common unit $ 4.65 $ 0.60 $ 9.10 $ 0.65 Diluted net income per common unit Weighted average common units—basic 12,506 12,351 12,461 12,322 Plus: dilutive effect of preferred units 6,292 14,351 6,292 — Plus: dilutive effect of warrants 937 — 734 — Plus: dilutive effect of unvested unit-based awards 178 119 209 117 Weighted average common units—diluted 19,913 26,821 19,696 12,439 Net income $ 66,820 $ 15,382 $ 130,719 $ 23,763 Less: income attributable to preferred unitholders — — — (15,569) Diluted net income attributable to common unitholders and the general partner $ 66,820 $ 15,382 $ 130,719 $ 8,194 Less: diluted net income attributable to the general partner (1,336) (308) (2,614) (164) Diluted net income attributable to common unitholders $ 65,484 $ 15,074 $ 128,105 $ 8,030 Diluted net income per common unit $ 3.29 $ 0.56 $ 6.50 $ 0.65

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2022
Segment Reporting [Abstract]
Segment Information	Segment Information The Partnership's segments are strategic business units that offer distinct products and services to different customers in different geographies within the U.S. and that are managed accordingly. NRP has the following two operating segments: Mineral Rights —c onsists of mineral interests and other subsurface rights across the United States. NRP's ownership provides critical inputs for the manufacturing of steel, electricity and basic building materials, as well as opportunities for carbon sequestration and renewable energy. The Partnership is working to strategically redefine its business as a key player in the transitional energy economy in the years to come. Soda Ash —consists of the Partnership's 49% non-controlling equity interest in Sisecam Wyoming, a trona ore mining operation and soda ash refinery in the Green River Basin of Wyoming. Sisecam Wyoming mines trona and processes it into soda ash that is sold both domestically and internationally to the glass and chemicals industries. Direct segment costs and certain other costs incurred at the corporate level that are identifiable and that benefit the Partnership's segments are allocated to the operating segments accordingly. These allocated costs generally include salaries and benefits, insurance, property taxes, legal, royalty, information technology and shared facilities services and are included in operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. Corporate and Financing includes functional corporate departments that do not earn revenues. Costs incurred by these departments include interest and financing, corporate headquarters and overhead, centralized treasury, legal and accounting and other corporate-level activity not specifically allocated to a segment and are included in general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income. The following table summarizes certain financial information for each of the Partnership's business segments: Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Three Months Ended June 30, 2022 Revenues $ 84,945 $ 14,643 $ — $ 99,588 Gain on asset sales and disposals 345 — — 345 Operating and maintenance expenses 9,992 23 — 10,015 Depreciation, depletion and amortization 5,847 — — 5,847 General and administrative expenses — — 5,052 5,052 Asset impairments 43 — — 43 Other expenses, net — — 12,156 12,156 Net income (loss) 69,408 14,620 (17,208) 66,820 For the Three Months Ended June 30, 2021 Revenues $ 35,793 $ 2,601 $ — $ 38,394 Gain on asset sales and disposals 116 — — 116 Operating and maintenance expenses 5,135 35 — 5,170 Depreciation, depletion and amortization 4,871 — — 4,871 General and administrative expenses — — 3,388 3,388 Asset impairment 16 — — 16 Other expenses, net 1 — 9,682 9,683 Net income (loss) 25,886 2,566 (13,070) 15,382 For the Six Months Ended June 30, 2022 Revenues $ 159,824 $ 29,480 $ — $ 189,304 Gain on asset sales and disposals 345 — — 345 Operating and maintenance expenses 18,017 74 — 18,091 Depreciation, depletion and amortization 9,715 — — 9,715 General and administrative expenses — — 9,519 9,519 Asset impairments 62 — — 62 Other expenses, net — — 21,543 21,543 Net income (loss) 132,375 29,406 (31,062) 130,719 For the Six Months Ended June 30, 2021 Revenues $ 70,912 $ 4,574 $ — $ 75,486 Gain on asset sales and disposals 175 — — 175 Operating and maintenance expenses 10,667 55 — 10,722 Depreciation, depletion and amortization 9,963 — — 9,963 General and administrative expenses — — 7,498 7,498 Asset impairments 4,059 — — 4,059 Other expenses, net 24 — 19,632 19,656 Net income (loss) 46,374 4,519 (27,130) 23,763

Equity Investment

Equity Investment	6 Months Ended
	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Investment	Equity Investment The Partnership accounts for its 49% investment in Sisecam Wyoming using the equity method of accounting. Activity related to this investment is as follows: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Balance at beginning of period $ 280,156 $ 261,299 $ 276,004 $ 262,514 Income allocation to NRP’s equity interests 15,804 3,855 31,869 7,071 Amortization of basis difference (1,161) (1,254) (2,389) (2,497) Other comprehensive income (loss) (4,013) 2,533 (1,468) 3,265 Distribution (10,486) — (23,716) (3,920) Balance at end of period $ 280,300 $ 266,433 $ 280,300 $ 266,433 The following table represents summarized financial information for Sisecam Wyoming as derived from their respective unaudited financial statements for the three and six months ended June 30, 2022 and 2021: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Net sales $ 189,068 $ 120,690 $ 352,505 $ 248,481 Gross profit 40,279 14,087 80,044 26,787 Net income 32,253 7,867 65,039 14,430

Mineral Rights, Net

Mineral Rights, Net	6 Months Ended
	Jun. 30, 2022
Extractive Industries [Abstract]
Mineral Rights, Net	Mineral Rights, Net The Partnership’s mineral rights consist of the following: June 30, 2022 December 31, 2021 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 670,613 $ (262,160) $ 408,453 $ 670,650 $ (253,503) $ 417,147 Aggregates properties 8,717 (3,201) 5,516 8,747 (2,975) 5,772 Oil and gas royalty properties 12,354 (9,357) 2,997 12,354 (9,115) 3,239 Other 13,151 (1,612) 11,539 13,151 (1,612) 11,539 Total mineral rights, net $ 704,835 $ (276,330) $ 428,505 $ 704,902 $ (267,205) $ 437,697 Depletion expense related to the Partnership’s mineral rights is included in depreciation, depletion and amortization on its Consolidated Statements of Comprehensive Income and totaled $5.4 million and $4.4 million for the three months ended June 30, 2022 and 2021, respectively, and $9.1 million and $9.2 million for the six months ended June 30, 2022 and 2021, respectively. During the three months ended June 30, 2022 and 2021 and during the six months ended June 30, 2022 the Partnership did not have any material asset impairments. During the six months ended June 30, 2021, the Partnership recorded $4.1 million of expense primarily due to a lease termination that resulted in the full impairment of a coal property. The Partnership has developed procedures to evaluate its long-lived assets for possible impairment periodically or whenever events or changes in circumstances indicate an asset's net book value may not be recoverable. Potential events or circumstances include, but are not limited to, specific events such as a reduction in economically recoverable reserves or production ceasing on a property for an extended period. This analysis is based on historic, current and future performance and considers both quantitative and qualitative information. While the Partnership's impairment evaluation as of June 30, 2022 incorporated an estimated impact of the global COVID-19 pandemic, there is significant uncertainty as to the severity and duration of this disruption. If the impact is worse than current estimates, an additional impairment charge may be recognized in future periods.

Debt, Net

Debt, Net	6 Months Ended
	Jun. 30, 2022
Debt Disclosure [Abstract]
Debt, Net	Debt, Net The Partnership's debt consists of the following: June 30, December 31, (In thousands) 2022 2021 NRP LP debt: 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") $ 181,890 $ 300,000 Opco debt: Revolving credit facility $ — $ — Senior Notes 5.55% with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023 $ 2,366 $ 4,730 4.73% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023 12,008 12,008 5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 25,368 38,053 8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 8,023 12,035 5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 57,104 57,104 5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 14,554 14,554 Total Opco Senior Notes $ 119,423 $ 138,484 Total debt at face value $ 301,313 $ 438,484 Net unamortized debt issuance costs (2,947) (4,939) Total debt, net $ 298,366 $ 433,545 Less: current portion of long-term debt (39,070) (39,102) Total long-term debt, net $ 259,296 $ 394,443 NRP LP Debt 2025 Senior Notes The 2025 Senior Notes were issued under an Indenture dated as of April 29, 2019 (the "2025 Indenture"), bear interest at 9.125% per year and mature on June 30, 2025. Interest is payable semi-annually on June 30 and December 30. NRP and NRP Finance have the option to redeem the 2025 Senior Notes, in whole or in part, at any time on or after October 30, 2021, at the redemption prices (expressed as percentages of principal amount) of 104.563% for the 12-month period beginning October 30, 2021, 102.281% for the 12-month period beginning October 30, 2022, and thereafter at 100.000%, together, in each case, with any accrued and unpaid interest to the date of redemption. In the event of a change of control, as defined in the 2025 Indenture, the holders of the 2025 Senior Notes may require us to purchase their 2025 Senior Notes at a purchase price equal to 101% of t he principal amount of the 2025 Senior Notes, plus accrued and unpaid interest, if any. The 2025 Senior Notes were issued at par. During the second quarter of 2022, NRP and NRP Finance retired $118.1 million of its 2025 Senior Notes. These notes were purchased on the open market at a weighted average price of 102.275%, a discount to the current redemption price of 104.563%. The $2.7 million call premium and fees and the write off of $1.3 million of debt issuance costs are included in loss on extinguishment of debt on the Partnership's Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2022. The 2025 Senior Notes are the senior unsecured obligations of NRP and NRP Finance. The 2025 Senior Notes rank equal in right of payment to all existing and future senior unsecured debt of NRP and NRP Finance and senior in right of payment to any of NRP's subordinated debt. The 2025 Senior Notes are effectively subordinated in right of payment to all future secured debt of NRP and NRP Finance to the extent of the value of the collateral securing such indebtedness and are structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries, including the Opco Credit Facility and each series of Opco’s existing senior notes. "Opco" refers to NRP (Operating) LLC, a wholly owned subsidiary of NRP, and its subsidiaries. None of NRP's subsidiaries guarantee the 2025 Senior Notes. As of June 30, 2022 and December 31, 2021, NRP and NRP Finance were in compliance with the terms of the Indenture relating to their 2025 Senior Notes. Opco Debt All of Opco’s debt is guaranteed by its wholly owned subsidiaries and is secured by certain of the assets of Opco and its wholly owned subsidiaries, other than BRP LLC and NRP Trona LLC. As of June 30, 2022 and December 31, 2021, Opco was in compliance with the terms of the financial covenants contained in its debt agreements. Opco Credit Facility In April 2019, the Partnership entered into the Fourth Amendment (the “Fourth Amendment”) to the Opco Credit Facility (the "Opco Credit Facility"). The Fourth Amendment extended the term of the Opco Credit Facility until April 2023. Lender commitments under the Opco Credit Facility remain at $100.0 million. The Opco Credit Facility contains financial covenants requiring Opco to maintain: • A leverage ratio of consolidated indebtedness to EBITDDA (as defined in the Opco Credit Facility) not to exceed 4.0x; provided, however, that if the Partnership increases its quarterly distribution to its common unitholders above $0.45 per common unit, the maximum leverage ratio under the Opco Credit Facility will permanently decrease from 4.0x to 3.0x; and • a fixed charge coverage ratio of consolidated EBITDDA to consolidated fixed charges (consisting of consolidated interest expense and consolidated lease expense) of not less than 3.5 to 1.0. During the six months ended June 30, 2022 and 2021, the Partnership did not have any borrowings outstanding under the Opco Credit Facility and had $100.0 million in available borrowing capacity at both June 30, 2022 and December 31, 2021. The Opco Credit Facility is collateralized and secured by liens on certain of Opco’s assets with carrying values of $336.8 million and $345.0 million classified as mineral rights, net and other long-term assets, net on the Partnership’s Cons olidated Balance Sheets as of June 30, 2022 and December 31, 2021, respectively. Opco Senior Notes Opco has issued several series of private placement senior notes (the "Opco Senior Notes") with various interest rates and principal due dates. As of June 30, 2022 and December 31, 2021, the Opco Senior Notes had cumulative principal balances of $119.4 million and $138.5 million, respectively. Opco made mandatory principal payments of $19.1 million during the six months ended June 30, 2022 and 2021. The 8.92% Opco Senior Notes also provides that in the event that Opco’s leverage ratio of consolidated indebtedness to consolidated EBITDDA (as defined in the Note Purchase Agreements) exceeds 3.75 to 1.00 at the end of any fiscal quarter, then in addition to all other interest accruing on these notes, additional interest in the amount of 2.00% per annum shall accrue on the notes for the two succeeding quarters and for as long thereafter as the leverage ratio remains above 3.75 to 1.00. Opco has not exceeded the 3.75 to 1.00 ratio at the end of any fiscal quarter through June 30, 2022.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair Value of Financial Assets and Liabilities The Partnership’s financial assets and liabilities consist of cash and cash equivalents, a contract receivable and debt. The carrying amounts reported on the Consolidated Balance Sheets for cash and cash equivalents approximate fair value due to their short-term nature. The Partnership uses available market data and valuation methodologies to estimate the fair value of its debt and contract receivable. The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable: June 30, 2022 December 31, 2021 (In thousands) Fair Value Hierarchy Level Carrying Estimated Carrying Estimated Debt: NRP 2025 Senior Notes 1 $ 179,934 $ 186,437 $ 296,236 $ 300,000 Opco Senior Notes (1) 3 118,432 122,408 137,309 138,484 Opco Credit Facility 3 — — — — Assets: Contract receivable, net (current and long-term) (2) 3 $ 32,514 $ 25,444 $ 33,612 $ 26,010 (1) The fair value of the Opco Senior Notes are estimated by management using quotations obtained for the NRP 2025 Senior Notes on the closing trading prices near period end, which were at 103% and 100% of par value at June 30, 2022 and December 31, 2021, respectively. (2) The fair value of the Partnership's contract receivable is determined based on the present value of future cash flow projections related to the underlying asset at a discount rate of 15% at June 30, 2022 and December 31, 2021.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Affiliates of our General Partner The Partnership’s general partner does not receive any management fee or other compensation for its management of NRP. However, in accordance with the partnership agreement, the general partner and its affiliates are reimbursed for services provided to the Partnership and for expenses incurred on the Partnership’s behalf. Employees of Quintana Minerals Corporation ("QMC") and Western Pocahontas Properties Limited Partnership ("WPPLP"), affiliates of the Partnership, provide their services to manage the Partnership's business. QMC and WPPLP charge the Partnership the portion of their employee salary and benefits costs related to their employee services provided to NRP. These QMC and WPPLP employee management service costs are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income. NRP also reimburses overhead costs incurred by its affiliates, including Quintana Infrastructure Development ("QID"), to manage the Partnership's business. These overhead costs include certain rent, information technology, administration of employee benefits and other corporate services incurred by or on behalf of the Partnership’s general partner and its affiliates and are presented as operating and maintenance expenses and general and administrative expenses on the Partnership's Consolidated Statements of Comprehensive Income. Direct general and administrative expenses charged to the Partnership by QMC, WPPLP and QID are included on the Partnership's Consolidated Statement of Comprehensive Income as follows: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Operating and maintenance expenses $ 1,698 $ 1,645 $ 3,357 $ 3,252 General and administrative expenses 1,225 1,115 2,465 2,301 The Partnership had accounts payable on its Consolidated Balance Sheets of $0.4 million to QMC at both June 30, 2022 and December 31, 2021 and $0.9 million to WPPLP at June 30, 2022 and December 31, 2021. During the three months ended June 30, 2022 and 2021, the Partnership recognized $2.7 million and $1.0 million, respectively, in operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to an overriding royalty agreement with WPPLP. These amounts were $4.3 million and $1.2 million during the six months ended June 30, 2022 and 2021. Corbin J. Robertson, Jr. owns 85% of the general partner of Great Northern Properties Limited Partnership ("GNP"), a privately held company primarily engaged in owning and managing mineral properties and surface leases. As of June 30, 2022 and December 31, 2021 the Partnership had $0.0 million and $0.1 million, respectively, of accounts receivable from GNP included in accounts receivable, net on its Consolidated Balance Sheets related to amounts collected for surface leases that belong to NRP.

Major Customers

Major Customers	6 Months Ended
	Jun. 30, 2022
Risks and Uncertainties [Abstract]
Major Customers	Major Customers Revenues from customers that exceeded 10 percent of total revenues for any of the periods presented below are as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2022 2021 2022 2021 (In thousands) Revenues Percent Revenues Percent Revenues Percent Revenues Percent Foresight Energy Resources LLC ("Foresight") (1) (2) $ 16,497 17 % $ 8,562 22 % $ 27,747 15 % $ 17,134 23 % Alpha Metallurgical Resources, Inc. (1) 32,895 33 % 8,851 23 % 60,638 32 % 16,894 22 % (1) Revenues from Foresight and Alpha Metallurgical Resources, Inc. are included within the Partnership's Mineral Rights segment. (2) Revenues from Foresight in 2021 were fixed as a result of the lease amendment the Partnership entered into with Foresight pursuant to which Foresight agreed to pay NRP fixed cash payments to satisfy all obligations arising out of the existing various coal mining leases and transportation infrastructure fee agreements between the Partnership and Foresight. Revenues from Foresight in 2022 represent traditional royalty and minimum payments.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies NRP is involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, Partnership management believes these ordinary course matters will not have a material effect on the Partnership’s financial position, liquidity or operations.

Unit-Based Compensation

Unit-Based Compensation	6 Months Ended
	Jun. 30, 2022
Unit-Based Compensation [Abstract]
Unit-Based Compensation	Unit-Based Compensation The Partnership's unit-based awards granted in 2022 and 2021 were valued using the closing price of NRP's common units as of the grant date. The grant date fair value of these awards granted during the six months ended June 30, 2022 and 2021 were $7.9 million and $3.8 million, respectively. Total unit-based compensation expense associated with these awards was $1.3 million and $0.6 million for the three months ended June 30, 2022 and 2021, respectively, and $2.8 million and $1.7 million for the six months ended June 30, 2022 and 2021, respectively, and is included in general and administrative expenses and operating and maintenance expenses on the Partnership's Consolidated Statements of Comprehensive Income. The unamortized cost associated with unvested outstanding awards as of June 30, 2022 is $8.8 million, which is to be recognized over a weighted average period of 2.2 years. The unamortized cost associated with unvested outstanding awards as of December 31, 2021 was $3.3 million. A summary of the unit activity in the outstanding grants during 2022 is as follows: (In thousands) Common Units Weighted Average Grant Date Fair Value per Common Unit Outstanding at January 1, 2022 411 $ 23.00 Granted 208 $ 38.29 Fully vested and issued (233) $ 26.74 Outstanding at June 30, 2022 386 $ 28.96

Financing Transaction

Financing Transaction	6 Months Ended
	Jun. 30, 2022
Financing Transaction [Abstract]
Financing Transaction	Financing Transaction The Partnership owns rail loadout and associated infrastructure at the Sugar Camp mine in the Illinois Basin operated by a subsidiary of Foresight. The infrastructure at the Sugar Camp mine is leased to a subsidiary of Foresight and is accounted for as a financing transaction (the "Sugar Camp lease"). The Sugar Camp lease expires in 2032 with renewal options for up to 80 additional years. Minimum payments are $5.0 million per year through the end of the lease term. The Partnership is also entitled to variable payments in the form of throughput fees determined based on the amount of coal transported and processed utilizing the Partnership's assets. In the event the Sugar Camp lease is renewed beyond 2032, payments become a fixed $10 thousand per year for the remainder of the renewed term.

Credit Losses

Credit Losses	6 Months Ended
	Jun. 30, 2022
Credit Losses [Abstract]
Credit Losses	Credit Losses The Partnership is exposed to credit losses through collection of its short-term trade receivables resulting from contracts with customers and a long-term receivable resulting from a financing transaction with a customer. The Partnership records an allowance for current expected credit losses on these receivables based on the loss-rate method. NRP assessed the likelihood of collection of its receivables utilizing historical loss rates, current market conditions that included the estimated impact of the global COVID-19 pandemic, industry and macroeconomic factors, reasonable and supportable forecasts and facts or circumstances of individual customers and properties. Examples of these facts or circumstances include, but are not limited to, contract disputes or renegotiations with the customer and evaluation of short and long-term economic viability of the contracted property. For its long-term contract receivable, management reverts to the historical loss experience immediately after the reasonable and supportable forecast period ends. As of June 30, 2022 and December 31, 2021, NRP had the following current expected credit loss (“CECL”) allowance related to its receivables and long-term contract receivable: June 30, 2022 December 31, 2021 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 43,219 $ (3,994) $ 39,225 $ 28,869 $ (3,312) $ 25,557 Long-term contract receivable 31,265 (1,083) 30,182 32,497 (1,126) 31,371 Total $ 74,484 $ (5,077) $ 69,407 $ 61,366 $ (4,438) $ 56,928 NRP recorded $(0.4) million and $(1.1) million in operating and maintenance expenses on its Consolidated Statements of Comprehensive Income related to the change in the CECL allowance during the three months ended June 30, 2022 and 2021, respectively, and $0.6 million and $(0.7) million during the six months ended June 30, 2022 and 2021, respectively. NRP has procedures in place to monitor its ongoing credit exposure through timely review of counterparty balances against contract terms and due dates, account and financing receivable reconciliation, bankruptcy monitoring, lessee audits and dispute resolution. The Partnership may employ legal counsel or collection specialists to pursue recovery of defaulted receivables.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The following represents material events that have occurred subsequent to June 30, 2022 through the time of the Partnership’s filing of its Quarterly Report on Form 10-Q with the SEC: Common Unit and Preferred Unit Distributions In August 2022, the Board of Directors declared a distribution of $0.75 per common unit with respect to the second quarter of 2022. The Board of Directors also declared a distribution on NRP's preferred units with respect to the second quarter of 2022 totaling $7.5 million in cash. Repurchases of 2025 Senior Notes In July 2022, NRP and NRP Finance retired an additional $38.8 million of its 2025 Senior Notes, leaving $143.1 million of these Notes outstanding as of the date of this report. Our third quarter 2022 Consolidated Statements of Comprehensive Income will include a $1.8 million of loss on extinguishment of debt associated with these repurchases.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2022
Accounting Policies [Abstract]
Principles of Consolidation Reporting	Principles of Consolidation and ReportingThe accompanying unaudited Consolidated Financial Statements of the Partnership have been prepared in accordance with generally accepted accounting principles in the United States of America ("GAAP") for interim financial information and with Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These financial statements should be read in conjunction with the financial statements for the year ended December 31, 2021 and notes thereto included in the Partnership's Annual Report on Form 10-K, which was filed with the SEC on March 15, 2022.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers by Source	The following table presents the Partnership's Mineral Rights segment revenues by major source: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Coal royalty revenues $ 62,945 $ 18,298 $ 118,394 $ 33,663 Production lease minimum revenues 65 3,556 1,657 7,006 Minimum lease straight-line revenues 4,674 4,869 9,457 10,965 Property tax revenues 1,695 1,587 3,167 3,056 Wheelage revenues 4,379 1,844 8,096 3,625 Coal overriding royalty revenues 682 976 940 2,835 Lease amendment revenues 811 772 1,691 1,640 Aggregates royalty revenues 1,037 456 1,807 910 Oil and gas royalty revenues 2,906 900 4,720 2,266 Other revenues 139 353 487 572 Royalty and other mineral rights revenues $ 79,333 $ 33,611 $ 150,416 $ 66,538 Transportation and processing services revenues (1) 5,612 2,182 9,408 4,374 Total Mineral Rights segment revenues $ 84,945 $ 35,793 $ 159,824 $ 70,912 (1) Transportation and processing services revenues from contracts with customers as defined under ASC 606 was $4.9 million and $1.2 million for the three months ended June 30, 2022 and 2021, respectively, and $8.0 million and $2.5 million for the six months ended June 30, 2022 and 2021, respectively. The remaining transportation and processing services revenues of $0.7 million and $0.9 million for the three months ended June 30, 2022 and 2021, respectively, and $1.4 million and $1.9 million for the six months ended June 30, 2022 and 2021, respectively, related to other NRP-owned infrastructure leased to and operated by third-party operators accounted for under other guidance. See Note 14. Financing Trans action
Schedule of Receivables and Liabilities from Contracts with Customers	The following table details the Partnership's Mineral Rights segment receivables and liabilities resulting from contracts with customers: June 30, December 31, (In thousands) 2022 2021 Receivables Accounts receivable, net $ 33,629 $ 22,277 Other current assets, net (1) 1,861 769 Other long-term assets, net (2) 75 250 Contract liabilities Current portion of deferred revenue $ 11,475 $ 11,817 Deferred revenue 40,811 50,045 (1) Other current assets, net includes short-term notes receivables from contracts with customers. (2) Other long-term assets, net includes long-term lease amendment fee receivables from contracts with customers.
Activity Related to Coal Royalty and Other Segment Deferred Revenue	The following table shows the activity related to the Partnership's Mineral Rights segment deferred revenue: For the Six Months Ended (In thousands) 2022 2021 Balance at beginning of period (current and non-current) $ 61,862 $ 61,554 Increase due to minimums and lease amendment fees 7,997 7,938 Recognition of previously deferred revenue (17,573) (7,406) Balance at end of period (current and non-current) $ 52,286 $ 62,086
Schedule of Annual Minimums by Current Remaining Contract Term	The Partnership's non-cancelable annual minimum payments due under the lease terms of its coal and aggregates royalty leases are as follows as of June 30, 2022 (in thousands): Lease Term (1) Weighted Average Remaining Years Annual Minimum Payments 0 - 5 years 2.5 $ 20,754 5 - 10 years 4.1 7,500 10+ years 13.1 26,610 Total 7.9 $ 54,864 (1) Lease term does not include renewal periods.

Common and Preferred Unit Dis_2

Common and Preferred Unit Distributions (Tables)	6 Months Ended
	Jun. 30, 2022
Equity [Abstract]
Distributions declared and paid	The following table shows the cash distributions declared and paid to common and preferred unitholders during the six months ended June 30, 2022 and 2021, respectively: Cash Distributions Paid-in-kind Distributions Common Units Preferred Units Month Paid Period Covered by Distribution Distribution per Unit Total Distribution (1) (In thousands) Distribution per Unit Total Distribution Total Distribution 2022 February 2022 October 1 - December 31, 2021 $ 0.45 $ 5,672 $ 30.00 $ 7,500 — May 2022 January 1 - March 31, 2022 0.75 9,570 30.00 7,500 — 2021 February 2021 October 1 - December 31, 2020 $ 0.45 $ 5,630 $ 15.00 $ 3,806 3,806 May 2021 January 1 - March 31, 2021 0.45 5,672 15.00 3,864 3,864 (1) Totals include the amount paid to NRP's general partner in accordance with the general partner's 2% general partner interest.

Net Income Per Common Unit (Tab

Net Income Per Common Unit (Tables)	6 Months Ended
	Jun. 30, 2022
Earnings Per Share [Abstract]
Reconciliation of Net Income to Weighted Average Units Outstanding	The following tables reconcile the numerator and denominator of the basic and diluted net income per common unit computations and calculates basic and diluted net income per common unit: For the Three Months Ended For the Six Months Ended June 30, (In thousands, except per unit data) 2022 2021 2022 2021 Allocation of net income Net income $ 66,820 $ 15,382 $ 130,719 $ 23,763 Less: income attributable to preferred unitholders (7,500) (7,842) (15,000) (15,569) Net income attributable to common unitholders and the general partner $ 59,320 $ 7,540 $ 115,719 $ 8,194 Less: net income attributable to the general partner (1,186) (151) (2,314) (164) Net income attributable to common unitholders $ 58,134 $ 7,389 $ 113,405 $ 8,030 Basic net income per common unit Weighted average common units—basic 12,506 12,351 12,461 12,322 Basic net income per common unit $ 4.65 $ 0.60 $ 9.10 $ 0.65 Diluted net income per common unit Weighted average common units—basic 12,506 12,351 12,461 12,322 Plus: dilutive effect of preferred units 6,292 14,351 6,292 — Plus: dilutive effect of warrants 937 — 734 — Plus: dilutive effect of unvested unit-based awards 178 119 209 117 Weighted average common units—diluted 19,913 26,821 19,696 12,439 Net income $ 66,820 $ 15,382 $ 130,719 $ 23,763 Less: income attributable to preferred unitholders — — — (15,569) Diluted net income attributable to common unitholders and the general partner $ 66,820 $ 15,382 $ 130,719 $ 8,194 Less: diluted net income attributable to the general partner (1,336) (308) (2,614) (164) Diluted net income attributable to common unitholders $ 65,484 $ 15,074 $ 128,105 $ 8,030 Diluted net income per common unit $ 3.29 $ 0.56 $ 6.50 $ 0.65

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2022
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table summarizes certain financial information for each of the Partnership's business segments: Operating Segments (In thousands) Mineral Rights Soda Ash Corporate and Financing Total For the Three Months Ended June 30, 2022 Revenues $ 84,945 $ 14,643 $ — $ 99,588 Gain on asset sales and disposals 345 — — 345 Operating and maintenance expenses 9,992 23 — 10,015 Depreciation, depletion and amortization 5,847 — — 5,847 General and administrative expenses — — 5,052 5,052 Asset impairments 43 — — 43 Other expenses, net — — 12,156 12,156 Net income (loss) 69,408 14,620 (17,208) 66,820 For the Three Months Ended June 30, 2021 Revenues $ 35,793 $ 2,601 $ — $ 38,394 Gain on asset sales and disposals 116 — — 116 Operating and maintenance expenses 5,135 35 — 5,170 Depreciation, depletion and amortization 4,871 — — 4,871 General and administrative expenses — — 3,388 3,388 Asset impairment 16 — — 16 Other expenses, net 1 — 9,682 9,683 Net income (loss) 25,886 2,566 (13,070) 15,382 For the Six Months Ended June 30, 2022 Revenues $ 159,824 $ 29,480 $ — $ 189,304 Gain on asset sales and disposals 345 — — 345 Operating and maintenance expenses 18,017 74 — 18,091 Depreciation, depletion and amortization 9,715 — — 9,715 General and administrative expenses — — 9,519 9,519 Asset impairments 62 — — 62 Other expenses, net — — 21,543 21,543 Net income (loss) 132,375 29,406 (31,062) 130,719 For the Six Months Ended June 30, 2021 Revenues $ 70,912 $ 4,574 $ — $ 75,486 Gain on asset sales and disposals 175 — — 175 Operating and maintenance expenses 10,667 55 — 10,722 Depreciation, depletion and amortization 9,963 — — 9,963 General and administrative expenses — — 7,498 7,498 Asset impairments 4,059 — — 4,059 Other expenses, net 24 — 19,632 19,656 Net income (loss) 46,374 4,519 (27,130) 23,763

Equity Investment (Tables)

Equity Investment (Tables)	6 Months Ended
	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Summarized Financial Information	Activity related to this investment is as follows: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Balance at beginning of period $ 280,156 $ 261,299 $ 276,004 $ 262,514 Income allocation to NRP’s equity interests 15,804 3,855 31,869 7,071 Amortization of basis difference (1,161) (1,254) (2,389) (2,497) Other comprehensive income (loss) (4,013) 2,533 (1,468) 3,265 Distribution (10,486) — (23,716) (3,920) Balance at end of period $ 280,300 $ 266,433 $ 280,300 $ 266,433 The following table represents summarized financial information for Sisecam Wyoming as derived from their respective unaudited financial statements for the three and six months ended June 30, 2022 and 2021: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Net sales $ 189,068 $ 120,690 $ 352,505 $ 248,481 Gross profit 40,279 14,087 80,044 26,787 Net income 32,253 7,867 65,039 14,430

Mineral Rights, Net (Tables)

Mineral Rights, Net (Tables)	6 Months Ended
	Jun. 30, 2022
Extractive Industries [Abstract]
Mineral Rights	The Partnership’s mineral rights consist of the following: June 30, 2022 December 31, 2021 (In thousands) Carrying Value Accumulated Depletion Net Book Value Carrying Value Accumulated Depletion Net Book Value Coal properties $ 670,613 $ (262,160) $ 408,453 $ 670,650 $ (253,503) $ 417,147 Aggregates properties 8,717 (3,201) 5,516 8,747 (2,975) 5,772 Oil and gas royalty properties 12,354 (9,357) 2,997 12,354 (9,115) 3,239 Other 13,151 (1,612) 11,539 13,151 (1,612) 11,539 Total mineral rights, net $ 704,835 $ (276,330) $ 428,505 $ 704,902 $ (267,205) $ 437,697

Debt, Net (Tables)

Debt, Net (Tables)	6 Months Ended
	Jun. 30, 2022
Debt Disclosure [Abstract]
Total Debt	The Partnership's debt consists of the following: June 30, December 31, (In thousands) 2022 2021 NRP LP debt: 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") $ 181,890 $ 300,000 Opco debt: Revolving credit facility $ — $ — Senior Notes 5.55% with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023 $ 2,366 $ 4,730 4.73% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023 12,008 12,008 5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 25,368 38,053 8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 8,023 12,035 5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 57,104 57,104 5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026 14,554 14,554 Total Opco Senior Notes $ 119,423 $ 138,484 Total debt at face value $ 301,313 $ 438,484 Net unamortized debt issuance costs (2,947) (4,939) Total debt, net $ 298,366 $ 433,545 Less: current portion of long-term debt (39,070) (39,102) Total long-term debt, net $ 259,296 $ 394,443

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Debt and Contracts Receivable	The following table shows the carrying value and estimated fair value of the Partnership's debt and contract receivable: June 30, 2022 December 31, 2021 (In thousands) Fair Value Hierarchy Level Carrying Estimated Carrying Estimated Debt: NRP 2025 Senior Notes 1 $ 179,934 $ 186,437 $ 296,236 $ 300,000 Opco Senior Notes (1) 3 118,432 122,408 137,309 138,484 Opco Credit Facility 3 — — — — Assets: Contract receivable, net (current and long-term) (2) 3 $ 32,514 $ 25,444 $ 33,612 $ 26,010 (1) The fair value of the Opco Senior Notes are estimated by management using quotations obtained for the NRP 2025 Senior Notes on the closing trading prices near period end, which were at 103% and 100% of par value at June 30, 2022 and December 31, 2021, respectively.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2022
Related Party Transactions [Abstract]
Related Party Transaction Reimbursements Disclosure Table	Direct general and administrative expenses charged to the Partnership by QMC, WPPLP and QID are included on the Partnership's Consolidated Statement of Comprehensive Income as follows: For the Three Months Ended For the Six Months Ended June 30, (In thousands) 2022 2021 2022 2021 Operating and maintenance expenses $ 1,698 $ 1,645 $ 3,357 $ 3,252 General and administrative expenses 1,225 1,115 2,465 2,301

Major Customers (Tables)

Major Customers (Tables)	6 Months Ended
	Jun. 30, 2022
Risks and Uncertainties [Abstract]
Major customers	Revenues from customers that exceeded 10 percent of total revenues for any of the periods presented below are as follows: For the Three Months Ended June 30, For the Six Months Ended June 30, 2022 2021 2022 2021 (In thousands) Revenues Percent Revenues Percent Revenues Percent Revenues Percent Foresight Energy Resources LLC ("Foresight") (1) (2) $ 16,497 17 % $ 8,562 22 % $ 27,747 15 % $ 17,134 23 % Alpha Metallurgical Resources, Inc. (1) 32,895 33 % 8,851 23 % 60,638 32 % 16,894 22 % (1) Revenues from Foresight and Alpha Metallurgical Resources, Inc. are included within the Partnership's Mineral Rights segment. (2) Revenues from Foresight in 2021 were fixed as a result of the lease amendment the Partnership entered into with Foresight pursuant to which Foresight agreed to pay NRP fixed cash payments to satisfy all obligations arising out of the existing various coal mining leases and transportation infrastructure fee agreements between the Partnership and Foresight. Revenues from Foresight in 2022 represent traditional royalty and minimum payments.

Unit-Based Compensation (Tables

Unit-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2022
Unit-Based Compensation [Abstract]
Summary of Activity in Awards	A summary of the unit activity in the outstanding grants during 2022 is as follows: (In thousands) Common Units Weighted Average Grant Date Fair Value per Common Unit Outstanding at January 1, 2022 411 $ 23.00 Granted 208 $ 38.29 Fully vested and issued (233) $ 26.74 Outstanding at June 30, 2022 386 $ 28.96

Credit Losses (Tables)

Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2022
Credit Losses [Abstract]
Accounts Receivable, Allowance for Credit Loss	June 30, 2022 December 31, 2021 (In thousands) Gross CECL Allowance Net Gross CECL Allowance Net Receivables $ 43,219 $ (3,994) $ 39,225 $ 28,869 $ (3,312) $ 25,557 Long-term contract receivable 31,265 (1,083) 30,182 32,497 (1,126) 31,371 Total $ 74,484 $ (5,077) $ 69,407 $ 61,366 $ (4,438) $ 56,928

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details)	6 Months Ended
	Jun. 30, 2022 segment
Restricted Cash and Cash Equivalents Items [Line Items]
Number of operating segments	2
Ciner Wyoming
Restricted Cash and Cash Equivalents Items [Line Items]
Percentage of partnership interest owned (percent)	49%

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Partnerships' Coal Royalty and Other Segment Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Mineral Rights segment revenues	$ 99,588	$ 38,394	$ 189,304	$ 75,486
Mineral Rights
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	79,333	33,611	150,416	66,538
Total Mineral Rights segment revenues	84,945	35,793	159,824	70,912
Mineral Rights | Coal royalty revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	62,945	18,298	118,394	33,663
Mineral Rights | Production lease minimum revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	65	3,556	1,657	7,006
Mineral Rights | Minimum lease straight-line revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	4,674	4,869	9,457	10,965
Mineral Rights | Property tax revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	1,695	1,587	3,167	3,056
Mineral Rights | Wheelage revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	4,379	1,844	8,096	3,625
Mineral Rights | Coal overriding royalty revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	682	976	940	2,835
Mineral Rights | Lease amendment revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	811	772	1,691	1,640
Mineral Rights | Aggregates royalty revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	1,037	456	1,807	910
Mineral Rights | Oil and gas royalty revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	2,906	900	4,720	2,266
Mineral Rights | Other revenues
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	139	353	487	572
Mineral Rights | Transportation and processing services
Disaggregation of Revenue [Line Items]
Royalty and other mineral rights revenues	4,900	1,200	8,000	2,500
Total Mineral Rights segment revenues	5,612	2,182	9,408	4,374
Transportation and service revenue not included under 606	$ 700	$ 900	$ 1,400	$ 1,900

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Schedule of Receivables and Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Receivables [Abstract]
Other long-term assets, net	$ 4,664	$ 5,832
Contract liabilities
Current portion of deferred revenue	11,475	11,817
Deferred revenue	40,811	50,045
Coal Royalty
Receivables [Abstract]
Accounts receivable, net	33,629	22,277
Other current assets, net	1,861	769
Other long-term assets, net	75	250
Contract liabilities
Current portion of deferred revenue	11,475	11,817
Deferred revenue	$ 40,811	$ 50,045

Revenue from Contracts with C_5

Revenue from Contracts with Customers Revenue Recognition Deferred Revenue Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period (current and non-current)	$ 61,862	$ 61,554
Increase due to minimums and lease amendment fees	7,997	7,938
Recognition of previously deferred revenue	(17,573)	(7,406)
Balance at end of period (current and non-current)	$ 52,286	$ 62,086

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Schedule of Annual Minimums by Current Remaining Contract Term (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Annual minimum payments	$ 54,864
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-06-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Average Remaining Contract Term	7 years 10 months 24 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Annual minimum payments	$ 20,754
Average Remaining Contract Term	2 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Annual minimum payments	$ 7,500
Average Remaining Contract Term	4 years 1 month 6 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2032-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Annual minimum payments	$ 26,610
Average Remaining Contract Term	13 years 1 month 6 days

Common and Preferred Unit Dis_3

Common and Preferred Unit Distributions Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Temporary Equity [Line Items]
Income attributable to preferred unitholders	$ (7,500)	$ (7,500)	$ (7,842)	$ (7,700)	$ (15,000)	$ (15,569)
Natural Resource Partners L.P. | General Partner
Temporary Equity [Line Items]
General partner's general partner distribution					2%

Common and Preferred Unit Dis_4

Common and Preferred Unit Distributions Distributions declared and paid (Details) - USD ($)	1 Months Ended				3 Months Ended				6 Months Ended
	May 30, 2022	Feb. 28, 2022	May 31, 2021	Feb. 28, 2021	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022
Preferred Units
Dividends, Preferred Stock, Paid-in-kind	$ 0	$ 0	$ 3,864,000	$ 3,806,000
Natural Resource Partners L.P. | General Partner
Preferred Units
General partner's general partner distribution									2%
Common unitholders and general partner
Common Units
Distribution per Unit	$ 750	$ 0.45	$ 450	$ 0.45
Total Distribution					$ 9,570,000	$ 5,672,000	$ 5,672,000	$ 5,630,000
Preferred Units
Distribution per Unit	750	0.45	450	0.45
Preferred Partner
Common Units
Total Distribution					7,500,000	7,758,000	7,726,000	7,613,000
Preferred Partner | General Partner
Common Units
Total Distribution					$ 150,000	$ 155,000	$ 155,000	$ 152,000
Preferred Partner | Preferred Stock
Common Units
Distribution per Unit	30	30	15	15
Preferred Units
Distribution per Unit	$ 30	$ 30	$ 15	$ 15
Total Distribution	$ 7,500,000	$ 7,500,000	$ 3,864,000	$ 3,806,000
Cash Distribution | Common unitholders and general partner
Common Units
Total Distribution	$ 9,570,000	$ 5,672,000	$ 5,672,000	$ 5,630,000

Net Income Per Common Unit (Det

Net Income Per Common Unit (Details) - Warrant Holders - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Warrants at $22.81 Strike
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of warrants issued (in common units)	750	1,750	750	1,750
Exercise price of warrants (in dollars per unit)	$ 22.81	$ 22.81	$ 22.81	$ 22.81
Warrants at $34.00 Strike
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Number of warrants issued (in common units)	2,250	2,250	2,250	2,250
Exercise price of warrants (in dollars per unit)	$ 34	$ 34	$ 34	$ 34

Net Income Per Common Unit - Al

Net Income Per Common Unit - Allocation of Net Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended							6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022		Jun. 30, 2021		Mar. 31, 2021		Jun. 30, 2022	Jun. 30, 2021
Allocation of net income
Net income	$ 66,820	$ 63,899	[1]	$ 15,382	[2]	$ 8,381	[2]	$ 130,719	$ 23,763
Less: income attributable to preferred unitholders	(7,500)	(7,500)		(7,842)		(7,700)		(15,000)	(15,569)
Net income attributable to common unitholders and the general partner	59,320			7,540				115,719	8,194
Net income attributable to the general partner	(1,186)			(151)				(2,314)	(164)
Net income attributable to common unitholders	$ 58,134			$ 7,389				$ 113,405	$ 8,030
Basic net income per common unit
Weighted average common units - basic (in units)	12,506			12,351				12,461	12,322
Basic net income per common unit	$ 4.65			$ 0.60				$ 9.10	$ 0.65
Diluted net income per common unit
Weighted average common units - basic (in units)	12,506			12,351				12,461	12,322
Plus: dilutive effect of preferred units (in units)	6,292			14,351				6,292	0
Plus: dilutive effect of warrants (in units)	937			0				734	0
Plus: dilutive effect of unvested unit-based awards	178			119				209	117
Weighted average common units—diluted (in units)	19,913			26,821				19,696	12,439
Net income
Net income	$ 66,820	$ 63,899	[1]	$ 15,382	[2]	$ 8,381	[2]	$ 130,719	$ 23,763
Less: income attributable to preferred unitholders	0			0				0	(15,569)
Diluted net income attributable to common unitholders and the general partner	(66,820)			(15,382)				(130,719)	(8,194)
Less: diluted net income attributable to the general partner	(1,336)			(308)				(2,614)	(164)
Diluted net income attributable to common unitholders	$ 65,484			$ 15,074				$ 128,105	$ 8,030
Diluted net income per common unit (in dollars per unit)	$ 3.29			$ 0.56				$ 6.50	$ 0.65
[1]Net income includes $7.5 million of income attributable to preferred unitholders that accumulated during the period, of which $7.4 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.The accompanying notes are an integral part of these consolidated financial statements.[2]Net income includes $7.7 million of income attributable to preferred unitholders that accumulated during the period, of which $7.6 million is allocated to the common unitholders and $0.2 million is allocated to the general partner. (2) Net income includes $7.8 million of income attributable to preferred unitholders that accumulated during the period, of which $7.7 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.

Segment Information - Additiona

Segment Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2022 segment
Segment Reporting Information [Line Items]
Number of operating segments	2
Ciner Wyoming
Segment Reporting Information [Line Items]
Percentage of partnership interest owned (percent)	49%

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 99,588	$ 38,394	$ 189,304	$ 75,486
Gain on asset sales and disposals	345	116	345	175
Operating and maintenance expenses	10,015	5,170	18,091	10,722
Depreciation, depletion and amortization	5,847	4,871	9,715	9,963
General and administrative expenses	5,052	3,388	9,519	7,498
Asset impairments	43	16	62	4,059
Other expenses, net	12,156	9,683	21,543	19,656
Net income (loss)	66,820	15,382	130,719	23,763
Corporate and Financing
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Gain on asset sales and disposals	0	0		0
Operating and maintenance expenses	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
General and administrative expenses	5,052	3,388	9,519	7,498
Asset impairments	0		0	0
Other expenses, net	12,156	9,682	21,543	19,632
Net income (loss)	(17,208)	(13,070)	(31,062)	(27,130)
Mineral Rights
Segment Reporting Information [Line Items]
Revenues	84,945	35,793	159,824	70,912
Mineral Rights | Operating Segments
Segment Reporting Information [Line Items]
Revenues	84,945	35,793	159,824	70,912
Gain on asset sales and disposals	345	116	345	175
Operating and maintenance expenses	9,992	5,135	18,017	10,667
Depreciation, depletion and amortization	5,847	4,871	9,715	9,963
General and administrative expenses	0	0	0	0
Asset impairments	43	16	62	4,059
Other expenses, net	0	(1)	0	(24)
Net income (loss)	69,408	25,886	132,375	46,374
Soda Ash
Segment Reporting Information [Line Items]
Revenues	14,643	2,601	29,480	4,574
Soda Ash | Operating Segments
Segment Reporting Information [Line Items]
Revenues	14,643	2,601	29,480	4,574
Gain on asset sales and disposals	0	0	0	0
Operating and maintenance expenses	23	35	74	55
Depreciation, depletion and amortization	0	0	0	0
General and administrative expenses	0	0	0	0
Asset impairments	0	0	0	0
Other expenses, net	0	0	0	0
Net income (loss)	$ 14,620	$ 2,566	$ 29,406	$ 4,519

Equity Investment - Additional

Equity Investment - Additional Information (Detail)	Jun. 30, 2022
Ciner Wyoming
Schedule of Equity Method Investments [Line Items]
Percentage of partnership interest owned (percent)	49%

Equity Investment Summary of Ac

Equity Investment Summary of Activity in Equity Method Investment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Equity Method Investments [Roll Forward]
Balance at beginning of period			$ 276,004
Other comprehensive income (loss)	$ 62,807	$ 17,915	129,251	$ 27,028
Balance at end of period	280,300		280,300
Ciner Wyoming
Equity Method Investments [Roll Forward]
Balance at beginning of period	280,156	261,299	276,004	262,514
Income allocation to NRP’s equity interests	15,804	3,855	31,869	7,071
Amortization of basis difference	(1,161)	(1,254)	(2,389)	(2,497)
Other comprehensive income (loss)	(4,013)	2,533	(1,468)	3,265
Distribution	(10,486)	0	(23,716)	(3,920)
Balance at end of period	$ 280,300	$ 266,433	$ 280,300	$ 266,433

Equity Investment - Schedule of

Equity Investment - Schedule of Summarized Financial Information of Unaudited Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	[1]	Jun. 30, 2021		Mar. 31, 2021	[2]	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Net sales	$ 99,588			$ 38,394				$ 189,304	$ 75,486
Net income	66,820	$ 63,899		15,382	[2]	$ 8,381		130,719	23,763
Ciner Wyoming
Schedule of Equity Method Investments [Line Items]
Net sales	189,068			120,690				352,505	248,481
Gross profit	40,279			14,087				80,044	26,787
Net income	$ 32,253			$ 7,867				$ 65,039	$ 14,430
[1]Net income includes $7.5 million of income attributable to preferred unitholders that accumulated during the period, of which $7.4 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.The accompanying notes are an integral part of these consolidated financial statements.[2]Net income includes $7.7 million of income attributable to preferred unitholders that accumulated during the period, of which $7.6 million is allocated to the common unitholders and $0.2 million is allocated to the general partner. (2) Net income includes $7.8 million of income attributable to preferred unitholders that accumulated during the period, of which $7.7 million is allocated to the common unitholders and $0.2 million is allocated to the general partner.

Mineral Rights, Net - Mineral R

Mineral Rights, Net - Mineral Rights (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Carrying Value	$ 704,835		$ 704,835		$ 704,902
Accumulated Depletion	(276,330)		(276,330)		(267,205)
Net Book Value	428,505		428,505		437,697
Depletion and amortization expense on coal and other mineral rights	5,400	$ 4,400	9,100	$ 9,200
Coal Mineral Rights
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Carrying Value	670,613		670,613		670,650
Accumulated Depletion	(262,160)		(262,160)		(253,503)
Net Book Value	408,453		408,453		417,147
Aggregates Mineral Rights
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Carrying Value	8,717		8,717		8,747
Accumulated Depletion	(3,201)		(3,201)		(2,975)
Net Book Value	5,516		5,516		5,772
Oil And Gas Mineral Rights
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Carrying Value	12,354		12,354		12,354
Accumulated Depletion	(9,357)		(9,357)		(9,115)
Net Book Value	2,997		2,997		3,239
Other Mineral Rights
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Carrying Value	13,151		13,151		13,151
Accumulated Depletion	(1,612)		(1,612)		(1,612)
Net Book Value	$ 11,539		$ 11,539		$ 11,539

Mineral Rights, Net - Additiona

Mineral Rights, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Depletion and amortization expense on coal and other mineral rights	$ 5,400	$ 4,400	$ 9,100	$ 9,200
Asset impairments	$ 43	$ 16	$ 62	4,059
Coal Mineral Rights
Property, Plant and Equipment [Line Items]
Asset impairments				$ 4,100

Debt, Net - Debt (Detail)

Debt, Net - Debt (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal balance	$ 301,313	$ 438,484
Net unamortized debt issuance costs	(2,947)	(4,939)
Total debt, net	298,366	433,545
Less: current portion of long-term debt	(39,070)	(39,102)
Total long-term debt, net	259,296	394,443
Redemption Premium	2,700
Write off of Deferred Debt Issuance Cost	1,300
Early Repayment of Senior Debt	$ 118,100
Debt Instrument Redemption Price at Discount	102.275%
NRP LP | 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes")
Debt Instrument [Line Items]
Principal balance	$ 181,890	300,000
Rate of senior notes	9.125%
Opco | Revolving credit facility
Debt Instrument [Line Items]
Principal balance	$ 0	0
Opco | Senior Notes
Debt Instrument [Line Items]
Principal balance	119,423	138,484
Opco | 5.55% with semi-annual interest payments in June and December, with annual principal payments in June, due June 2023
Debt Instrument [Line Items]
Principal balance	$ 2,366	4,730
Rate of senior notes	5.55%
Opco | 4.73% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2023
Debt Instrument [Line Items]
Principal balance	$ 12,008	12,008
Rate of senior notes	4.73%
Opco | 5.82% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024
Debt Instrument [Line Items]
Principal balance	$ 25,368	38,053
Rate of senior notes	5.82%
Opco | 8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024
Debt Instrument [Line Items]
Principal balance	$ 8,023	12,035
Rate of senior notes	8.92%
Opco | 5.03% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026
Debt Instrument [Line Items]
Principal balance	$ 57,104	57,104
Rate of senior notes	5.03%
Opco | 5.18% with semi-annual interest payments in June and December, with annual principal payments in December, due December 2026
Debt Instrument [Line Items]
Principal balance	$ 14,554	$ 14,554
Rate of senior notes	5.18%

Debt, Net - Additional Informat

Debt, Net - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Principal balance	$ 301,313		$ 438,484
Revolving credit facility | Opco
Debt Instrument [Line Items]
Principal balance	0		0
Lender commitments under Opco Credit Facility	$ 100,000		100,000
Distribution per share (in dollars per share)	$ 0.45
Ratio Of Ebitda to consolidated fixed charges	3.5
Collateral carrying amount	$ 336,800		345,000
8.92% with semi-annual interest payments in March and September, with annual principal payments in March, due March 2024 | Opco
Debt Instrument [Line Items]
Rate of senior notes	8.92%
Principal balance	$ 8,023		12,035
Senior Notes | Opco
Debt Instrument [Line Items]
Principal balance	119,423		$ 138,484
Principal payments on its senior notes	$ 19,100	$ 19,100
Partnership leverage ratio	3.75
Additional interest accrue	2%
9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") | Senior Notes
Debt Instrument [Line Items]
Rate of senior notes	9.125%
Redemption price at change of control event as percentage of principal amount	101%
Dividend at or Below $0.45 per Share | Revolving credit facility | Opco
Debt Instrument [Line Items]
Maximum leverage ratio	4
Dividend Above $0.45 per Share | Revolving credit facility | Opco
Debt Instrument [Line Items]
Maximum leverage ratio	3
Debt Instrument, Redemption, Period One | 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") | Senior Notes
Debt Instrument [Line Items]
Redemption percentage of principal	104.563%
Debt Instrument, Redemption, Period Two | 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") | Senior Notes
Debt Instrument [Line Items]
Redemption percentage of principal	102.281%
Debt Instrument, Redemption, Period Three | 9.125% senior notes, with semi-annual interest payments in June and December, due June 2025, issued at par ("2025 Senior Notes") | Senior Notes
Debt Instrument [Line Items]
Redemption percentage of principal	100%

Fair Value Measurements - Contr

Fair Value Measurements - Contracts Receivable and Debt (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 298,366	$ 433,545
Contracts receivable, net (current and long-term)	$ 32,514	$ 33,612
Fair value, percentage of par	103%	100%
Discount rate	15%	15%
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contracts receivable, net (current and long-term)	$ 25,444	$ 26,010
NRP 2025 Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	179,934	296,236
NRP 2025 Senior Notes | Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	186,437	300,000
Opco Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	118,432	137,309
Opco Senior Notes | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	122,408	138,484
Opco Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	0	0
Opco Credit Facility | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	$ 0	$ 0

Fair Value Measurements - Embed

Fair Value Measurements - Embedded Derivatives (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Equity [Abstract]
Fair value of embedded derivatives	$ 0	$ 0

Related Party Transactions - Su

Related Party Transactions - Summary of Reimbursements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Related Party Transaction [Line Items]
General and administrative expenses	$ 5,052	$ 3,388	$ 9,519	$ 7,498
Western Pocahontas Properties and Quintana Minerals Corporation | Affiliated Entity
Related Party Transaction [Line Items]
Operating and maintenance expenses	1,698	1,645	3,357	3,252
General and administrative expenses	$ 1,225	$ 1,115	$ 2,465	$ 2,301

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Director | Corbin J. Robertson, Jr. | Great Northern Properties Limited Partnership
Related Party Transaction [Line Items]
Percentage of partnership interest owned (percent)	85%		85%
Quintana Minerals | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable to related parties	$ 0.4		$ 0.4		$ 0.4
Western Pocahontas Properties Limited Partnership | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable to related parties					0.9
Operating and maintenance expenses	2.7	$ 1	4.3	$ 1.2
Great Northern Properties Limited Partnership | Affiliated Entity
Related Party Transaction [Line Items]
Noncurrent accounts receivable from related parties	$ 0		$ 0		$ 0.1

Major Customers (Detail)

Major Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Concentration Risk [Line Items]
Revenues	$ 99,588	$ 38,394	$ 189,304	$ 75,486
Foresight Energy Lp
Concentration Risk [Line Items]
Revenues	16,497	8,562	27,747	17,134
Contura Energy
Concentration Risk [Line Items]
Revenues	$ 32,895	$ 8,851	$ 60,638	$ 16,894
Sales Revenue | Customer Concentration Risk | Foresight Energy Lp
Concentration Risk [Line Items]
Percent	17%	22%	15%	23%
Sales Revenue | Customer Concentration Risk | Contura Energy
Concentration Risk [Line Items]
Percent	33%	23%	32%	22%

Unit-Based Compensation (Detail

Unit-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards granted			$ 7.9	$ 3.8
Weighted average remaining term vesting recognized			2 years 2 months 12 days
Unamortized cost associated with unvested outstanding awards	$ 8.8		$ 8.8		$ 3.3
General and administrative expense and operating and maintenance expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit based compensation expense	$ 1.3	$ 0.6	$ 2.8	$ 1.7

Unit-Based Compensation Summary

Unit-Based Compensation Summary of unit based activity (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Common Units
Outstanding at beginning of period | shares	411
Granted | shares	208
Fully vested and issued | shares	(233)
Outstanding at the end of period | shares	386
Weighted Average Grant Date Fair Value per Common Unit
Outstanding at beginning of period | $ / shares	$ 28.96
Granted | $ / shares	38.29
Fully vested and issued | $ / shares	26.74
Outstanding at the end of period | $ / shares	$ 23

Financing Transaction (Details)

Financing Transaction (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2032
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of renewal options	80 years
Payments from coal lease accounted for as financing transaction	$ 5,000
Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Annual rent amount after lease completion		$ 10

Credit Losses (Details)

Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Gross
Receivables	$ 43,219		$ 43,219		$ 28,869
Long-term contract receivable	31,265		31,265		32,497
Total	74,484		74,484		61,366
CECL Allowance
Receivables	(3,994)		(3,994)		(3,312)
Long-term contract receivable	(1,083)		(1,083)		(1,126)
Total	(5,077)		(5,077)		(4,438)
Net
Receivables	39,225		39,225		25,557
Long-term contract receivable	30,182		30,182		31,371
Total	69,407		69,407		$ 56,928
Operating and maintenance expense	$ (400)	$ (1,100)	$ 600	$ (700)

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended						3 Months Ended		6 Months Ended
	Aug. 31, 2022	Jul. 31, 2022	May 30, 2022	Feb. 28, 2022	May 31, 2021	Feb. 28, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Aug. 04, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Preferred unit distributions paid-in-kind									$ 0	$ 7,669
Early Repayment of Senior Debt									118,100
Long-term Debt, Gross							$ 301,313		301,313			$ 438,484
Loss on extinguishment of debt							$ 4,048	$ 0	$ 4,048	$ 0
Preferred Partner | Preferred Stock
Subsequent Event [Line Items]
Distribution per Unit			$ 30	$ 30	$ 15	$ 15
Total distributions, preferred units			$ 7,500	$ 7,500	$ 3,864	$ 3,806
Subsequent Event
Subsequent Event [Line Items]
Distribution per Unit	$ 0.75
Total distributions, preferred units	$ 7,500
Early Repayment of Senior Debt		$ 38,800
Long-term Debt, Gross											$ 143,100
Loss on extinguishment of debt		$ 1,800