$NRP
NATURAL RESOURCE PARTNERS LP Stock $nrp

$nrp Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-K Financial Statement

#000117148621000009 Filed on March 15, 2021

Income Statement

Concept	2021 Q1	2020	2019 Q4
Revenue	$37.09M	$139.7M	$51.83M
YoY Change	-7.76%	-45.72%	-18.94%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$9.662M	$39.10M	$9.856M
YoY Change	6.0%	-21.01%	-78.58%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.092M	$9.198M	$3.186M
YoY Change	153.08%	-38.4%	-49.63%
% of Gross Profit
Operating Expenses	$18.80M	$184.2M	$13.04M
YoY Change	68.93%	-13.38%	-80.73%
Operating Profit	$18.35M	-$43.85M	-$109.1M
YoY Change	-36.9%	-185.44%	-309.35%
Interest Expense	$9.973M	$40.97M	-$10.39M
YoY Change	-3.25%	-13.67%	-85.19%
% of Operating Profit	54.34%
Other Income/Expense, Net	$9.973M	$40.97M
YoY Change	-3.25%	-46.61%
Pretax Income	$8.381M	-$84.80M	-$119.4M
YoY Change	-55.37%	233.86%	-197.62%
Income Tax
% Of Pretax Income
Net Earnings	$8.381M	-$84.82M	-$118.7M
YoY Change	-55.37%	246.79%	-341.95%
Net Earnings / Revenue	22.6%	-60.7%	-229.03%
Basic Earnings Per Share
Diluted Earnings Per Share	$675.5K	-$6.894M	-$9.679M
COMMON SHARES
Basic Shares Outstanding	12.35M shares		12.26M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2021 Q1	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$96.77M	$99.80M	$98.27M
YoY Change	-3.72%	1.53%	-3.51%
Cash & Equivalents	$96.77M	$99.80M	$98.27M
Short-Term Investments
Other Short-Term Assets	$3.021M	$5.100M	$2.950M
YoY Change	159.09%	75.86%	-97.28%
Inventory
Prepaid Expenses
Receivables	$15.92M	$12.30M	$30.87M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$115.7M	$117.2M	$132.1M
YoY Change	-14.79%	-11.28%	-45.54%
LONG-TERM ASSETS
Property, Plant & Equipment	$475.6M	$484.4M	$629.1M
YoY Change	-24.17%	-23.0%	63833.33%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$261.3M	$262.5M	$263.1M
YoY Change	0.03%	-0.23%	6.49%
Other Assets	$6.678M	$7.100M	$6.989M
YoY Change	-1.42%	1.43%	101.12%
Total Long-Term Assets	$793.5M	$804.7M	$953.8M
YoY Change	-16.27%	-15.63%	-13.22%
TOTAL ASSETS
Total Short-Term Assets	$115.7M	$117.2M	$132.1M
Total Long-Term Assets	$793.5M	$804.7M	$953.8M
Total Assets	$909.2M	$921.9M	$1.086B
YoY Change	-16.08%	-15.1%	-19.06%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.375M	$1.400M	$1.179M
YoY Change	8.1%	16.67%	-51.16%
Accrued Expenses	$4.853M	$9.400M	$8.764M
YoY Change	-19.17%	-15.32%	-29.02%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$39.04M	$39.10M	$45.78M
YoY Change	-14.69%	-14.63%	-60.26%
Total Short-Term Liabilities	$64.67M	$61.40M	$62.71M
YoY Change	-5.51%	-2.07%	-57.84%
LONG-TERM LIABILITIES
Long-Term Debt	$416.1M	$432.4M	$470.4M
YoY Change	-8.37%	-8.08%	-15.63%
Other Long-Term Liabilities	$4.730M	$55.20M	$4.949M
YoY Change	-1.54%	5.75%	330.35%
Total Long-Term Liabilities	$420.9M	$487.6M	$475.4M
YoY Change	-8.29%	-6.7%	-14.92%
TOTAL LIABILITIES
Total Short-Term Liabilities	$64.67M	$61.40M	$62.71M
Total Long-Term Liabilities	$420.9M	$487.6M	$475.4M
Total Liabilities	$536.4M	$549.0M	$585.3M
YoY Change	-7.75%	-5.73%	-22.63%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$372.8M	$372.9M	$503.6M
YoY Change
Total Liabilities & Shareholders Equity	$909.2M	$921.9M	$1.086B
YoY Change	-16.08%	-15.1%	-19.06%

Cashflow Statement

Concept	2021 Q1	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$8.381M	-$84.82M	-$118.7M
YoY Change	-55.37%	246.79%	-341.95%
Depreciation, Depletion And Amortization	$5.092M	$9.198M	$3.186M
YoY Change	153.08%	-38.4%	-49.63%
Cash From Operating Activities	$23.20M	$89.27M	$19.39M
YoY Change	-27.18%	-34.98%	-76.17%
INVESTING ACTIVITIES
Capital Expenditures		$0.00	-$22.00K
YoY Change
Acquisitions
YoY Change
Other Investing Activities	$600.0K	$1.700M	$208.0K
YoY Change	191.26%	-77.63%	-99.89%
Cash From Investing Activities	$600.0K	$1.680M	$186.0K
YoY Change	191.26%	-77.87%	-99.9%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net	$16.70M	$46.18M
YoY Change	0.0%	-90.03%
Cash From Financing Activities	-$26.82M	-$89.43M	-33.47M
YoY Change	-10.07%	-64.61%	-74.86%
NET CHANGE
Cash From Operating Activities	$23.20M	$89.27M	19.39M
Cash From Investing Activities	$600.0K	$1.680M	186.0K
Cash From Financing Activities	-$26.82M	-$89.43M	-33.47M
Net Change In Cash	-$3.023M	$1.525M	-13.90M
YoY Change	-234.9%	-101.42%	-109.74%
FREE CASH FLOW
Cash From Operating Activities	$23.20M	$89.27M	$19.39M
Capital Expenditures		$0.00	-$22.00K
Free Cash Flow		$89.27M	$19.41M
YoY Change		-34.98%	-76.15%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Registrant Name EntityRegistrantName	NATURAL RESOURCE PARTNERS LP
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001171486
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	12351306	shares
CY2019Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilities
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilities
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-31465
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-2164875
CY2020	dei	City Area Code CityAreaCode	713
CY2020	dei	Local Phone Number LocalPhoneNumber	751-7507
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1201 Louisiana Street, Suite 3400
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77002
CY2020	dei	Security12b Title Security12bTitle	Common Units representing limited partner interests
CY2020	dei	Trading Symbol TradingSymbol	NRP
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	true
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	99790000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	98265000	USD
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CY2020Q4	us-gaap	Land Land	24008000	USD
CY2019Q4	us-gaap	Land Land	24008000	USD
CY2020Q4	us-gaap	Mineral Properties Net MineralPropertiesNet	460373000	USD
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CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17459000	USD
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CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	262514000	USD
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CY2020Q4	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	33264000	USD
CY2019Q4	us-gaap	Nontrade Receivables Noncurrent NontradeReceivablesNoncurrent	36963000	USD
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CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	62708000	USD
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	50069000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	47213000	USD
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CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	5131000	USD
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CY2019Q4	us-gaap	Limited Partners Capital Account Units Issued LimitedPartnersCapitalAccountUnitsIssued	12261199	shares
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CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-115044000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-54458000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	109537000	USD
CY2020	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	-112743000	USD
CY2019	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	-53369000	USD
CY2018	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	107346000	USD
CY2020	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	-2301000	USD
CY2019	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	-1089000	USD
CY2018	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	2191000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-9.20
CY2019	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-4.43
CY2018	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	7.35
CY2020	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-9.20
CY2019	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-4.43
CY2018	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	5.90
CY2020	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-9.20
CY2019	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-4.35
CY2018	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	8.77
CY2020	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-9.20
CY2019	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-4.35
CY2018	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	6.76
CY2020	us-gaap	Profit Loss ProfitLoss	-84819000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-24458000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	140047000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2916000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	868000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-149000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-81903000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-23590000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	139898000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	510000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-81903000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-23590000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	139388000	USD
CY2017Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	261817000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	510000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	140047000	USD
CY2018	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	546000	USD
CY2018	nrp	Partners Capital Account Unitbased Compensation Amortization PartnersCapitalAccountUnitbasedCompensationAmortization	560000	USD
CY2018	nrp	Other Comprehensive Income Loss Netof Tax Portion Attributableto Parent Excluding General Partner Distributions OtherComprehensiveIncomeLossNetofTaxPortionAttributabletoParentExcludingGeneralPartnerDistributions	-139000	USD
CY2018Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	420546000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-24458000	USD
CY2019	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	486000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	1804000	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-1909000	USD
CY2019	nrp	Other Comprehensive Income Loss Netof Tax Portion Attributableto Parent Excluding General Partner Distributions OtherComprehensiveIncomeLossNetofTaxPortionAttributabletoParentExcludingGeneralPartnerDistributions	800000	USD
CY2019Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	336028000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-84819000	USD
CY2020	us-gaap	Partners Capital Account Unit Based Compensation PartnersCapitalAccountUnitBasedCompensation	0	USD
CY2020	nrp	Partners Capital Account Unitbased Compensation Amortization PartnersCapitalAccountUnitbasedCompensationAmortization	3222000	USD
CY2020	nrp	Other Comprehensive Income Loss Netof Tax Portion Attributableto Parent Excluding General Partner Distributions OtherComprehensiveIncomeLossNetofTaxPortionAttributabletoParentExcludingGeneralPartnerDistributions	2916000	USD
CY2020Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	204524000	USD
CY2018	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000.0	USD
CY2019	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000.0	USD
CY2020	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-84819000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-24458000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	140047000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9198000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	14932000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	21689000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	14210000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	31850000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	44453000	USD
CY2020	nrp	Equity Earnings From Unconsolidated Investment EquityEarningsFromUnconsolidatedInvestment	10728000	USD
CY2019	nrp	Equity Earnings From Unconsolidated Investment EquityEarningsFromUnconsolidatedInvestment	47089000	USD
CY2018	nrp	Equity Earnings From Unconsolidated Investment EquityEarningsFromUnconsolidatedInvestment	48306000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	581000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	6498000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2441000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-29282000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	956000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	17687000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	135885000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	148214000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	18280000	USD
CY2020	us-gaap	Provision For Other Losses ProvisionForOtherLosses	4001000	USD
CY2019	us-gaap	Provision For Other Losses ProvisionForOtherLosses	7462000	USD
CY2018	us-gaap	Provision For Other Losses ProvisionForOtherLosses	-62000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	3570000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	2361000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	1434000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1323000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	3687000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	7133000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-12853000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6035000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6062000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	207000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-1234000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1138000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-2205000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-3656000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	19000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-602000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-12029000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-1138000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	9733000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-732000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	19465000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4477000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2218000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-320000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	87568000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	137319000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	178282000	USD
CY2020	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	1706000	USD
CY2019	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-8000	USD
CY2018	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	10641000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	89274000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	137311000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	188923000	USD
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	2097000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	623000	USD
CY2019	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	6500000	USD
CY2018	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	2449000	USD
CY2020	us-gaap	Proceeds From Collection Of Lease Receivables ProceedsFromCollectionOfLeaseReceivables	2122000	USD
CY2019	us-gaap	Proceeds From Collection Of Lease Receivables ProceedsFromCollectionOfLeaseReceivables	1743000	USD
CY2018	us-gaap	Proceeds From Collection Of Lease Receivables ProceedsFromCollectionOfLeaseReceivables	3061000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1000000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Mineral Rights PaymentsToAcquireMineralRights	0	USD
CY2019	us-gaap	Payments To Acquire Mineral Rights PaymentsToAcquireMineralRights	22000	USD
CY2018	us-gaap	Payments To Acquire Mineral Rights PaymentsToAcquireMineralRights	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	1745000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	8221000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	7607000	USD
CY2020	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-65000	USD
CY2019	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-629000	USD
CY2018	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	183021000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1680000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	7592000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	190628000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	300000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	35000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	46176000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	463082000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	175706000	USD
CY2020	nrp	Proceeds From Paymentsto Discontinued Operations ProceedsFromPaymentstoDiscontinuedOperations	-1641000	USD
CY2019	nrp	Proceeds From Paymentsto Discontinued Operations ProceedsFromPaymentstoDiscontinuedOperations	637000	USD
CY2018	nrp	Proceeds From Paymentsto Discontinued Operations ProceedsFromPaymentstoDiscontinuedOperations	195690000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-26436000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-228000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-87788000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-253305000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-6839000	USD
CY2020	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-1641000	USD
CY2019	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	637000	USD
CY2018	us-gaap	Cash Provided By Used In Financing Activities Discontinued Operations CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations	-196509000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-89429000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-252668000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-203348000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1525000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-107765000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	176203000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	98265000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	206030000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	26980000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2017Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	2847000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	98265000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	206030000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	29827000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	99790000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	98265000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	206030000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2018Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	0	USD
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020Q4	nrp	Numberof Wholly Owned Operating Companies NumberofWhollyOwnedOperatingCompanies	1	company
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99790000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	98265000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	206030000	USD
CY2020	us-gaap	Interest Paid InterestPaid	39830000	USD
CY2019	us-gaap	Interest Paid InterestPaid	58597000	USD
CY2018	us-gaap	Interest Paid InterestPaid	64991000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	970000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	0	USD
CY2020	us-gaap	Dividends Paidinkind DividendsPaidinkind	3750000	USD
CY2019	us-gaap	Dividends Paidinkind DividendsPaidinkind	0	USD
CY2018	us-gaap	Dividends Paidinkind DividendsPaidinkind	0	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesPreparation of the accompanying financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities on the accompanying Consolidated Balance Sheets, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses on the accompanying Consolidated Statements of Comprehensive Income (Loss) during the reporting period. Actual results could differ from those estimates. The most significant estimates pertain to coal and aggregates reserves and related cash flow estimates which are used to compute depreciation, depletion and amortization and impairments of coal and aggregates properties and related intangible assets and commitments and contingencies.
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1600000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4000000.0	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	7500000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-100000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	129011000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	210348000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	202765000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	51821000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	52553000	USD
CY2017Q4	us-gaap	Deferred Revenue DeferredRevenue	100605000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	51821000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	52553000	USD
CY2018Q1	us-gaap	Deferred Revenue DeferredRevenue	35014000	USD
CY2020	nrp	Deferred Revenue Contractual Minimum Payments DeferredRevenueContractualMinimumPayments	41557000	USD
CY2019	nrp	Deferred Revenue Contractual Minimum Payments DeferredRevenueContractualMinimumPayments	47038000	USD
CY2018	nrp	Deferred Revenue Contractual Minimum Payments DeferredRevenueContractualMinimumPayments	37781000	USD
CY2020	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	31824000	USD
CY2019	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	47770000	USD
CY2018	us-gaap	Deferred Revenue Revenue Recognized1 DeferredRevenueRevenueRecognized1	20242000	USD
CY2020Q4	us-gaap	Deferred Revenue DeferredRevenue	61554000	USD
CY2019Q4	us-gaap	Deferred Revenue DeferredRevenue	51821000	USD
CY2018Q4	us-gaap	Deferred Revenue DeferredRevenue	52553000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P4Y4M24D
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	13349000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P5Y4M24D
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	8022000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P13Y8M12D
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	30130000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P9Y7M6D
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	51501000	USD
CY2020	nrp	Paymentsfor Proceedsfrom Loans Receivable Annual Minimum Payment PaymentsforProceedsfromLoansReceivableAnnualMinimumPayment	5000000.0	USD
CY2018	nrp	Distribution Madeto Limited Partner Unit Redemption DistributionMadetoLimitedPartnerUnitRedemption	8844	shares
CY2020	us-gaap	Dividends Preferred Stock Paidinkind DividendsPreferredStockPaidinkind	3750	USD
CY2020	us-gaap	Dividends Paidinkind DividendsPaidinkind	3750000	USD
CY2020	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30200000	USD
CY2018	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000.0	USD
CY2019	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-84819000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-25414000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	122360000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	510000	USD
CY2020	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30225000	USD
CY2019	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000	USD
CY2018	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000	USD
CY2020	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partnerand Limited Partners IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartnerandLimitedPartners	-115044000	USD
CY2019	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partnerand Limited Partners IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartnerandLimitedPartners	-55414000	USD
CY2018	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partnerand Limited Partners IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartnerandLimitedPartners	91850000	USD
CY2020	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	-2301000	USD
CY2019	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	-1108000	USD
CY2018	nrp	Income Lossfrom Continuing Operationsand Income Attributableto Preferred Unitholders Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandIncomeAttributabletoPreferredUnitholdersIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	1837000	USD
CY2020	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Limited Partners IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoLimitedPartners	-112743000	USD
CY2019	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Limited Partners IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoLimitedPartners	-54306000	USD
CY2018	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Limited Partners IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoLimitedPartners	90013000	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	956000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	17687000	USD
CY2020	nrp	Net Income Lossfrom Discontinued Operations Allocatedto General Partner NetIncomeLossfromDiscontinuedOperationsAllocatedtoGeneralPartner	0	USD
CY2019	nrp	Net Income Lossfrom Discontinued Operations Allocatedto General Partner NetIncomeLossfromDiscontinuedOperationsAllocatedtoGeneralPartner	-19000	USD
CY2018	nrp	Net Income Lossfrom Discontinued Operations Allocatedto General Partner NetIncomeLossfromDiscontinuedOperationsAllocatedtoGeneralPartner	354000	USD
CY2020	nrp	Net Income Loss Allocatedto Common Unitholders Discontinued Operations NetIncomeLossAllocatedtoCommonUnitholdersDiscontinuedOperations	0	USD
CY2019	nrp	Net Income Loss Allocatedto Common Unitholders Discontinued Operations NetIncomeLossAllocatedtoCommonUnitholdersDiscontinuedOperations	937000	USD
CY2018	nrp	Net Income Loss Allocatedto Common Unitholders Discontinued Operations NetIncomeLossAllocatedtoCommonUnitholdersDiscontinuedOperations	17333000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-84819000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-24458000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	140047000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	510000	USD
CY2020	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30225000	USD
CY2019	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000	USD
CY2018	nrp	Income Lossfrom Continuing Operations Including Portion Attributableto Noncontrolling Interest Allocatedto Preferred Unit Holders IncomeLossfromContinuingOperationsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoPreferredUnitHolders	-30000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-115044000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-54458000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	109537000	USD
CY2020	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	-2301000	USD
CY2019	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	-1089000	USD
CY2018	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	2191000	USD
CY2020	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	-112743000	USD
CY2019	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	-53369000	USD
CY2018	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	107346000	USD
CY2020	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12261000	shares
CY2019	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12260000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12244000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-9.20
CY2019	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-4.43
CY2018	us-gaap	Income Loss From Continuing Operations Per Outstanding Limited Partnership Unit Basic Net Of Tax IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	7.35
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Basic IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	0
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Basic IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	0.08
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Basic IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	1.42
CY2020	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-9.20
CY2019	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	-4.35
CY2018	us-gaap	Net Income Loss Per Outstanding Limited Partnership Unit Basic Net Of Tax NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	8.77
CY2020	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12261000	shares
CY2019	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12260000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	12244000	shares
CY2020	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Preferred Units WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofPreferredUnits	0	shares
CY2019	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Preferred Units WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofPreferredUnits	0	shares
CY2018	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Preferred Units WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofPreferredUnits	7479000	shares
CY2020	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Warrants WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofWarrants	0	shares
CY2019	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Warrants WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofWarrants	0	shares
CY2018	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Warrants WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofWarrants	511000	shares
CY2020	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Unit Awards WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofUnitAwards	0	shares
CY2019	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Unit Awards WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofUnitAwards	0	shares
CY2018	nrp	Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Effectof Unit Awards WeightedAverageNumberDilutedLimitedPartnershipUnitsOutstandingAdjustmentEffectofUnitAwards	0	shares
CY2020	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	12261000	shares
CY2019	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	12260000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	20234000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-84819000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-25414000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	122360000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	510000	USD
CY2020	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	30225000	USD
CY2019	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	30000000	USD
CY2018	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	0	USD
CY2020	nrp	Diluted Income Lossfrom Continuing Operations Netof Tax Including Portion Attributableto Noncontrolling Interest DilutedIncomeLossfromContinuingOperationsNetofTaxIncludingPortionAttributabletoNoncontrollingInterest	-115044000	USD
CY2019	nrp	Diluted Income Lossfrom Continuing Operations Netof Tax Including Portion Attributableto Noncontrolling Interest DilutedIncomeLossfromContinuingOperationsNetofTaxIncludingPortionAttributabletoNoncontrollingInterest	-55414000	USD
CY2018	nrp	Diluted Income Lossfrom Continuing Operations Netof Tax Including Portion Attributableto Noncontrolling Interest DilutedIncomeLossfromContinuingOperationsNetofTaxIncludingPortionAttributabletoNoncontrollingInterest	121850000	USD
CY2020	nrp	Income Lossfrom Continuing Operationsand Other Incomefrom Warrant Liability Fair Value Adjustments Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandOtherIncomefromWarrantLiabilityFairValueAdjustmentsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	-2301000	USD
CY2019	nrp	Income Lossfrom Continuing Operationsand Other Incomefrom Warrant Liability Fair Value Adjustments Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandOtherIncomefromWarrantLiabilityFairValueAdjustmentsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	-1108000	USD
CY2018	nrp	Income Lossfrom Continuing Operationsand Other Incomefrom Warrant Liability Fair Value Adjustments Including Portion Attributableto Noncontrolling Interest Allocatedto General Partner IncomeLossfromContinuingOperationsandOtherIncomefromWarrantLiabilityFairValueAdjustmentsIncludingPortionAttributabletoNoncontrollingInterestAllocatedtoGeneralPartner	2437000	USD
CY2020	nrp	Diluted Income Lossfrom Continuing Operations Attributableto Parent DilutedIncomeLossfromContinuingOperationsAttributabletoParent	-112743000	USD
CY2019	nrp	Diluted Income Lossfrom Continuing Operations Attributableto Parent DilutedIncomeLossfromContinuingOperationsAttributabletoParent	-54306000	USD
CY2018	nrp	Diluted Income Lossfrom Continuing Operations Attributableto Parent DilutedIncomeLossfromContinuingOperationsAttributabletoParent	119413000	USD
CY2020	nrp	Net Income Loss Availableto Common Stockholders Discontinued Operations Diluted NetIncomeLossAvailabletoCommonStockholdersDiscontinuedOperationsDiluted	0	USD
CY2019	nrp	Net Income Loss Availableto Common Stockholders Discontinued Operations Diluted NetIncomeLossAvailabletoCommonStockholdersDiscontinuedOperationsDiluted	937000	USD
CY2018	nrp	Net Income Loss Availableto Common Stockholders Discontinued Operations Diluted NetIncomeLossAvailabletoCommonStockholdersDiscontinuedOperationsDiluted	17333000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-84819000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-24458000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	140047000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	510000	USD
CY2020	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	30225000	USD
CY2019	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	30000000	USD
CY2018	us-gaap	Undistributed Earnings Diluted UndistributedEarningsDiluted	0	USD
CY2020	nrp	Net Income Loss Allocatedto General Partnersand Limited Partners Diluted NetIncomeLossAllocatedtoGeneralPartnersandLimitedPartnersDiluted	-115044000	USD
CY2019	nrp	Net Income Loss Allocatedto General Partnersand Limited Partners Diluted NetIncomeLossAllocatedtoGeneralPartnersandLimitedPartnersDiluted	-54458000	USD
CY2018	nrp	Net Income Loss Allocatedto General Partnersand Limited Partners Diluted NetIncomeLossAllocatedtoGeneralPartnersandLimitedPartnersDiluted	139537000	USD
CY2020	nrp	Income Loss Attributableto Parentand Other Incomefrom Warrant Liability Fair Value Adjustments Allocatedto General Partner IncomeLossAttributabletoParentandOtherIncomefromWarrantLiabilityFairValueAdjustmentsAllocatedtoGeneralPartner	2301000	USD
CY2019	nrp	Income Loss Attributableto Parentand Other Incomefrom Warrant Liability Fair Value Adjustments Allocatedto General Partner IncomeLossAttributabletoParentandOtherIncomefromWarrantLiabilityFairValueAdjustmentsAllocatedtoGeneralPartner	-1089000	USD
CY2018	nrp	Income Loss Attributableto Parentand Other Incomefrom Warrant Liability Fair Value Adjustments Allocatedto General Partner IncomeLossAttributabletoParentandOtherIncomefromWarrantLiabilityFairValueAdjustmentsAllocatedtoGeneralPartner	2791000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-112743000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-53369000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	136746000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-9.20
CY2019	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-4.43
CY2018	us-gaap	Income Loss From Continuing Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted IncomeLossFromContinuingOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	5.90
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted1 IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted1	0
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted1 IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted1	0.08
CY2018	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Outstanding Limited Partnership Unit Diluted1 IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted1	0.86
CY2020	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-9.20
CY2019	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	-4.35
CY2018	us-gaap	Net Income Loss Net Of Tax Per Outstanding Limited Partnership Unit Diluted NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	6.76
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020	us-gaap	Revenues Revenues	139739000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	581000	USD
CY2020	nrp	Operating Costsand Expenses Including Affiliates OperatingCostsandExpensesIncludingAffiliates	24795000	USD
CY2020	nrp	Depreciation Depletionand Amortization Including Related Parties DepreciationDepletionandAmortizationIncludingRelatedParties	9198000	USD
CY2020	nrp	Generaland Administrative Expenseincludingaffiliates GeneralandAdministrativeExpenseincludingaffiliates	14293000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	135885000	USD
CY2020	us-gaap	Other Expenses OtherExpenses	40968000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-84819000	USD
CY2019	us-gaap	Revenues Revenues	257437000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	6498000	USD
CY2019	nrp	Operating Costsand Expenses Including Affiliates OperatingCostsandExpensesIncludingAffiliates	32738000	USD
CY2019	nrp	Depreciation Depletionand Amortization Including Related Parties DepreciationDepletionandAmortizationIncludingRelatedParties	14932000	USD
CY2019	nrp	Generaland Administrative Expenseincludingaffiliates GeneralandAdministrativeExpenseincludingaffiliates	16730000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	148214000	USD
CY2019	us-gaap	Other Expenses OtherExpenses	76735000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-25414000	USD
CY2019	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	956000	USD
CY2018	us-gaap	Revenues Revenues	251071000	USD
CY2018	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	25000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2441000	USD
CY2018	nrp	Operating Costsand Expenses Including Affiliates OperatingCostsandExpensesIncludingAffiliates	29509000	USD
CY2018	nrp	Depreciation Depletionand Amortization Including Related Parties DepreciationDepletionandAmortizationIncludingRelatedParties	21689000	USD
CY2018	nrp	Generaland Administrative Expenseincludingaffiliates GeneralandAdministrativeExpenseincludingaffiliates	16496000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	18280000	USD
CY2018	us-gaap	Other Expenses OtherExpenses	70178000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	122360000	USD
CY2018	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	17687000	USD
CY2020	nrp	Weighted Average Useful Life Of Equity Method Investment Difference Between Carrying Amount And Underlying Equity WeightedAverageUsefulLifeOfEquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	P27Y
CY2020Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	820170000	USD
CY2020Q4	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	359797000	USD
CY2020Q4	us-gaap	Mineral Properties Net MineralPropertiesNet	460373000	USD
CY2019Q4	us-gaap	Mineral Properties Net MineralPropertiesNet	605096000	USD
CY2019Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	1048389000	USD
CY2019Q4	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	443293000	USD
CY2020	nrp	Depletion And Amortization Expense On Coal And Other Mineral Rights DepletionAndAmortizationExpenseOnCoalAndOtherMineralRights	8800000	USD
CY2019	nrp	Depletion And Amortization Expense On Coal And Other Mineral Rights DepletionAndAmortizationExpenseOnCoalAndOtherMineralRights	12100000	USD
CY2018	nrp	Depletion And Amortization Expense On Coal And Other Mineral Rights DepletionAndAmortizationExpenseOnCoalAndOtherMineralRights	17000000.0	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	600000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	6500000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	2400000	USD
CY2019	nrp	Discount Rate DiscountRate	0.15
CY2018	nrp	Discount Rate DiscountRate	0.11
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	53878000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	53878000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	36419000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	36191000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17459000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17687000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	200000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2500000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1155000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	525000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1199000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1037000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	950000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	477880000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	524056000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6381000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	7858000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	471499000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	516198000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	39055000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	45776000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	432444000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	470422000	USD
CY2019	us-gaap	Redemption Premium RedemptionPremium	18100000	USD
CY2019	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	10400000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	39396000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	39396000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	39396000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	31028000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	314332000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	14332000	USD
CY2020Q4	nrp	Long Term Debt Maturities Repayments Of Principal LongTermDebtMaturitiesRepaymentsOfPrincipal	477880000	USD
CY2020Q4	us-gaap	Receivables Fair Value Disclosure ReceivablesFairValueDisclosure	35313000	USD
CY2019Q4	us-gaap	Receivables Fair Value Disclosure ReceivablesFairValueDisclosure	38945000	USD
CY2020Q4	nrp	Fairvaluepercentageofpar Fairvaluepercentageofpar	0.92
CY2020	nrp	Discount Rate DiscountRate	0.15
CY2020Q4	us-gaap	Embedded Derivative Fair Value Of Embedded Derivative Liability EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability	0	USD
CY2019Q4	us-gaap	Embedded Derivative Fair Value Of Embedded Derivative Liability EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability	0	USD
CY2020Q4	us-gaap	Litigation Reserve LitigationReserve	0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	800000	shares
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P3Y
CY2020	nrp	Sharebased Compensation Arrangementby Sharebased Payment Award Equity Instruments Otherthan Options Grantsin Period Fair Value SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue	3500000	USD
CY2019	nrp	Sharebased Compensation Arrangementby Sharebased Payment Award Equity Instruments Otherthan Options Grantsin Period Fair Value SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue	5400000	USD
CY2018	nrp	Sharebased Compensation Arrangementby Sharebased Payment Award Equity Instruments Otherthan Options Grantsin Period Fair Value SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue	2200000	USD
CY2020Q4	nrp	Unaccrued Cost Associated With Outstanding Grants And Related Distribution Equivalent Rights UnaccruedCostAssociatedWithOutstandingGrantsAndRelatedDistributionEquivalentRights	3700000	USD
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P1Y7M6D
CY2019Q4	nrp	Unaccrued Cost Associated With Outstanding Grants And Related Distribution Equivalent Rights UnaccruedCostAssociatedWithOutstandingGrantsAndRelatedDistributionEquivalentRights	3500000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	157000	shares
CY2019Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	37.48
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	203000	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	17.20
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	0	shares
CY2020Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	5000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	17.20
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	355000	shares
CY2020Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	26.20
CY2020Q4	us-gaap	Lessor Operating Lease Renewal Term LessorOperatingLeaseRenewalTerm	P80Y
CY2020	nrp	Paymentsfor Proceedsfrom Loans Receivable Annual Minimum Payment PaymentsforProceedsfromLoansReceivableAnnualMinimumPayment	5000000.0	USD
CY2020	nrp	Paymentsfor Proceedsfrom Loans Receivable Annual Minimum Payment PaymentsforProceedsfromLoansReceivableAnnualMinimumPayment	5000000.0	USD
CY2020Q4	nrp	Shortterm Receivables Gross ShorttermReceivablesGross	18512000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2358000	USD
CY2020Q4	nrp	Shorttermreceivablesnetof Cecl ShorttermreceivablesnetofCECL	16154000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	34818000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	1554000	USD
CY2020Q4	us-gaap	Long Term Investments And Receivables Net LongTermInvestmentsAndReceivablesNet	33264000	USD
CY2020Q4	nrp	Totalreceivables Gross TotalreceivablesGross	53330000	USD
CY2020Q4	nrp	Cecl Allowancetotal CECLAllowancetotal	3912000	USD
CY2020Q4	nrp	Totalreceivablesnetof Cecl TotalreceivablesnetofCECL	49418000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	13529000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-0.0	USD
CY2020	us-gaap	Lessee Operating Lease Option To Extend LesseeOperatingLeaseOptionToExtend	five
CY2020Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3500000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3500000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3500000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3500000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	500000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	500000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	483000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	483000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	483000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	483000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	483000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11114000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P28Y
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	10033000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3496000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.135
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	1706000	USD
CY2019Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	1706000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable Current DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent	42000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Accrued Liabilities DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities	23000	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	65000	USD

Files In Submission

Name	View Source	Status
0001171486-21-000009-index-headers.html	Edgar Link	pending
0001171486-21-000009-index.html	Edgar Link	pending
0001171486-21-000009.txt	Edgar Link	pending
0001171486-21-000009-xbrl.zip	Edgar Link	pending
a2020q4exhibit211.htm	Edgar Link	pending
a2020q4exhibit231.htm	Edgar Link	pending
a2020q4exhibit232.htm	Edgar Link	pending
a2020q4exhibit311.htm	Edgar Link	pending
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a2020q4exhibit321.htm	Edgar Link	pending
a2020q4exhibit322.htm	Edgar Link	pending
a2020q4exhibit991.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nrp-20201231.htm	Edgar Link	pending
nrp-20201231.xsd	Edgar Link	pending
nrp-20201231_cal.xml	Edgar Link	unprocessable
nrp-20201231_def.xml	Edgar Link	unprocessable
nrp-20201231_g1.jpg	Edgar Link	pending
nrp-20201231_htm.xml	Edgar Link	completed
nrp-20201231_lab.xml	Edgar Link	unprocessable
nrp-20201231_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$NRP
NATURAL RESOURCE PARTNERS LP Stock $nrp

2021 Q1 Form 10-K Financial Statement

#000117148621000009 Filed on March 15, 2021

Income Statement

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Facts In Submission

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$NRP NATURAL RESOURCE PARTNERS LP Stock $nrp

2021 Q1 Form 10-K Financial Statement

#000117148621000009 Filed on March 15, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NRP
NATURAL RESOURCE PARTNERS LP Stock $nrp