$NHC
NATIONAL HEALTHCARE CORP Stock $nhc

$nhc Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-Q Financial Statement

#000143774919021585 Filed on November 05, 2019

Income Statement

Concept	2019 Q3	2018 Q3	2018 Q2
Revenue	$247.1M	$246.3M	$242.1M
YoY Change	0.3%	2.13%	1.44%
Cost Of Revenue	$152.2M	$149.2M	$145.5M
YoY Change	1.99%	2.26%	1.96%
Gross Profit	$94.89M	$97.10M	$96.70M
YoY Change	-2.27%	1.89%	0.73%
Gross Profit Margin	38.41%	39.42%	39.94%
Selling, General & Admin	$10.17M	$10.20M	$10.30M
YoY Change	-0.32%	0.99%	1.98%
% of Gross Profit	10.71%	10.5%	10.65%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$10.66M	$10.50M	$10.40M
YoY Change	1.55%	-2.78%	-0.95%
% of Gross Profit	11.24%	10.81%	10.75%
Operating Expenses	$87.56M	$85.10M	$83.20M
YoY Change	2.89%	1.07%	0.6%
Operating Profit	$6.568M	$10.83M	$12.17M
YoY Change	-39.38%	10.72%	0.22%
Interest Expense	$764.0K	$1.170M	$1.253M
YoY Change	-34.7%	-11.5%	2.79%
% of Operating Profit	11.63%	10.8%	10.3%
Other Income/Expense, Net	$6.663M	$8.467M	$5.654M
YoY Change	-21.31%	39.03%	8.96%
Pretax Income	$22.54M	$22.79M	$30.27M
YoY Change	-1.07%	43.54%	74.68%
Income Tax	$3.167M	$1.700M	$7.892M
% Of Pretax Income	14.05%	7.46%	26.07%
Net Earnings	$19.46M	$21.14M	$22.46M
YoY Change	-7.95%	86.24%	110.8%
Net Earnings / Revenue	7.88%	8.58%	9.28%
Basic Earnings Per Share	$1.27	$1.39	$1.47
Diluted Earnings Per Share	$1.27	$1.39	$1.47
COMMON SHARES
Basic Shares Outstanding	15.28M	15.23M	15.22M
Diluted Shares Outstanding	15.37M	15.24M	15.23M

Balance Sheet

Concept	2019 Q3	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$80.48M	$73.21M	$79.39M
YoY Change	9.94%	-65.73%	-62.02%
Cash & Equivalents	$59.26M	$55.60M	$59.32M
Short-Term Investments	$21.22M	$17.61M	$20.06M
Other Short-Term Assets	$32.01M	$31.00M	$31.10M
YoY Change	3.26%	10.71%	6.87%
Inventory	$7.774M	$7.590M	$7.306M
Prepaid Expenses
Receivables	$92.04M	$87.26M	$82.23M
Other Receivables	$3.786M	$3.500M	$1.500M
Total Short-Term Assets	$351.2M	$324.5M	$317.5M
YoY Change	8.23%	-3.46%	-3.42%
LONG-TERM ASSETS
Property, Plant & Equipment	$539.6M	$540.9M	$544.0M
YoY Change	-0.25%	-2.07%	-2.07%
Goodwill	$21.00M	$21.00M	$17.60M
YoY Change	0.0%	19.29%	0.0%
Intangibles
YoY Change
Long-Term Investments	$36.99M	$30.10M	$28.00M
YoY Change	22.88%	-14.97%	-22.87%
Other Assets	$416.4M	$219.3M	$209.2M
YoY Change	89.93%	-1.41%	-3.13%
Total Long-Term Assets	$956.0M	$760.2M	$753.3M
YoY Change	25.76%	-1.88%	-2.37%
TOTAL ASSETS
Total Short-Term Assets	$351.2M	$324.5M	$317.5M
Total Long-Term Assets	$956.0M	$760.2M	$753.3M
Total Assets	$1.307B	$1.085B	$1.071B
YoY Change	20.52%	-2.36%	-2.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$18.69M	$19.60M	$16.20M
YoY Change	-4.63%	33.33%	10.2%
Accrued Expenses	$111.8M	$86.30M	$83.40M
YoY Change	29.57%	6.54%	5.7%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00
YoY Change
Total Short-Term Liabilities	$181.1M	$151.5M	$143.0M
YoY Change	19.49%	2.67%	4.34%
LONG-TERM LIABILITIES
Long-Term Debt	$30.00M	$75.00M	$85.00M
YoY Change	-60.0%	-37.5%	-29.17%
Other Long-Term Liabilities	$13.77M	$14.70M	$16.34M
YoY Change	-6.38%	-5.4%	-5.85%
Total Long-Term Liabilities	$43.77M	$89.70M	$101.3M
YoY Change	-51.21%	-33.82%	-26.22%
TOTAL LIABILITIES
Total Short-Term Liabilities	$181.1M	$151.5M	$143.0M
Total Long-Term Liabilities	$43.77M	$89.70M	$101.3M
Total Liabilities	$535.2M	$363.5M	$364.0M
YoY Change	47.26%	-13.33%	-11.39%
SHAREHOLDERS EQUITY
Retained Earnings	$547.3M	$505.9M	$492.4M
YoY Change	8.18%	24.84%	22.73%
Common Stock	$153.0K	$152.0K	$152.0K
YoY Change	0.66%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$771.6M	$720.0M	$706.3M
YoY Change
Total Liabilities & Shareholders Equity	$1.307B	$1.085B	$1.071B
YoY Change	20.52%	-2.36%	-2.68%

Cashflow Statement

Concept	2019 Q3	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$19.46M	$21.14M	$22.46M
YoY Change	-7.95%	86.24%	110.8%
Depreciation, Depletion And Amortization	$10.66M	$10.50M	$10.40M
YoY Change	1.55%	-2.78%	-0.95%
Cash From Operating Activities	$35.71M	$27.70M	$36.10M
YoY Change	28.92%	-9.77%	32.23%
INVESTING ACTIVITIES
Capital Expenditures	-$5.681M	-$7.200M	-$8.400M
YoY Change	-21.1%	-5.26%	-2.33%
Acquisitions
YoY Change
Other Investing Activities	$7.228M	-$3.100M	-$2.600M
YoY Change	-333.16%		-70.45%
Cash From Investing Activities	$1.547M	-$10.30M	-$11.00M
YoY Change	-115.02%	35.53%	-37.14%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-35.08M	-18.60M	-22.90M
YoY Change	88.62%	135.44%	227.14%
NET CHANGE
Cash From Operating Activities	35.71M	27.70M	36.10M
Cash From Investing Activities	1.547M	-10.30M	-11.00M
Cash From Financing Activities	-35.08M	-18.60M	-22.90M
Net Change In Cash	2.176M	-1.200M	2.200M
YoY Change	-281.33%	-107.89%	-21.43%
FREE CASH FLOW
Cash From Operating Activities	$35.71M	$27.70M	$36.10M
Capital Expenditures	-$5.681M	-$7.200M	-$8.400M
Free Cash Flow	$41.39M	$34.90M	$44.50M
YoY Change	18.6%	-8.88%	23.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Security Exchange Name SecurityExchangeName	NYSEAMER
CY2019Q3	nhc	Number Of Independent Living Facilities NumberOfIndependentLivingFacilities	5	pure
CY2019Q3	nhc	Number Of Geriatric Psychiatric Hospitals NumberOfGeriatricPsychiatricHospitals	1	pure
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	pure
CY2019Q3	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2172000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	pure
CY2014Q2	nhc	Number Of Facilities Under Capitalized Lease NumberOfFacilitiesUnderCapitalizedLease	3	pure
CY2014Q2	nhc	Number Of Capitalized Lease Agreements NumberOfCapitalizedLeaseAgreements	3	pure
CY2018	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P3Y
CY2018	nhc	Annual Excess Coverage AnnualExcessCoverage	9000000.0	USD
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	15318790
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	15255002
CY2019Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15318790
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15255002
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	235090000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	234827000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	706465000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	697173000	USD
CY2019Q3	nhc	Other Revenues OtherRevenues	11977000	USD
CY2018Q3	nhc	Other Revenues OtherRevenues	11499000	USD
	nhc	Other Revenues OtherRevenues	36038000	USD
	nhc	Other Revenues OtherRevenues	34256000	USD
CY2019Q3	us-gaap	Revenues Revenues	247067000	USD
CY2018Q3	us-gaap	Revenues Revenues	246326000	USD
	us-gaap	Revenues Revenues	742503000	USD
	us-gaap	Revenues Revenues	731429000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	152175000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	149188000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	441441000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	434749000	USD
CY2019Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	66730000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	64507000	USD
CY2019Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10663000	USD
CY2018Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10437000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	203760000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	192268000	USD
CY2019Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10167000	USD
CY2018Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10190000	USD
	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	30602000	USD
	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	30691000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1700000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15284000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9792000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	19376000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	21087000	USD
	us-gaap	Profit Loss ProfitLoss	54289000	USD
	us-gaap	Profit Loss ProfitLoss	40563000	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-85000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-55000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-152000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-249000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	19461000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	31515000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	31176000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	764000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	1170000	USD
	us-gaap	Interest Expense InterestExpense	2644000	USD
	us-gaap	Interest Expense InterestExpense	3663000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	240499000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	235492000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	709962000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	692547000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	6568000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10834000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	32541000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	38882000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6663000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8467000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	20936000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11056000	USD
CY2019Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	9312000	USD
CY2018Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3486000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	16096000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	417000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	22543000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	22787000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	69573000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	50355000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3167000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21142000	USD
	us-gaap	Net Income Loss NetIncomeLoss	54441000	USD
	us-gaap	Net Income Loss NetIncomeLoss	40812000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.39
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.68
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15275709
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15225654
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15267250
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15221217
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15373617
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15242086
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15350308
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15230692
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.52
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.50
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.54
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.48
CY2019Q3	us-gaap	Profit Loss ProfitLoss	19376000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	21087000	USD
	us-gaap	Profit Loss ProfitLoss	54289000	USD
	us-gaap	Profit Loss ProfitLoss	40563000	USD
CY2019Q3	nhc	Other Comprehensive Income Loss Securities Restricted Marketable Debt Securities Unrealized Holding Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossSecuritiesRestrictedMarketableDebtSecuritiesUnrealizedHoldingGainLossArisingDuringPeriodBeforeTax	855000	USD
CY2018Q3	nhc	Other Comprehensive Income Loss Securities Restricted Marketable Debt Securities Unrealized Holding Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossSecuritiesRestrictedMarketableDebtSecuritiesUnrealizedHoldingGainLossArisingDuringPeriodBeforeTax	-180000	USD
	nhc	Other Comprehensive Income Loss Securities Restricted Marketable Debt Securities Unrealized Holding Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossSecuritiesRestrictedMarketableDebtSecuritiesUnrealizedHoldingGainLossArisingDuringPeriodBeforeTax	7049000	USD
	nhc	Other Comprehensive Income Loss Securities Restricted Marketable Debt Securities Unrealized Holding Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossSecuritiesRestrictedMarketableDebtSecuritiesUnrealizedHoldingGainLossArisingDuringPeriodBeforeTax	-3772000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	117000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-7000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	117000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	18000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	155000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-36000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	1456000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-795000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	583000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-137000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5476000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2995000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-85000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-55000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-152000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-249000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20044000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21005000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	59917000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	37817000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	59261000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	43247000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	7114000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	9967000	USD
CY2019Q3	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	156319000	USD
CY2018Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	140223000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	21222000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	18676000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	92040000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	97274000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	7774000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	7470000	USD
CY2019Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	3674000	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	3863000	USD
CY2019Q3	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	1456000	USD
CY2018Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	1289000	USD
CY2019Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	2330000	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	351190000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	322009000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1010629000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	979088000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	471025000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	444438000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	539604000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	534650000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1707000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	1706000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	128335000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Noncurrent AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	153917000	USD
CY2019Q3	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	5636000	USD
CY2018Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	5602000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	208785000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q3	us-gaap	Goodwill Goodwill	20995000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	20995000	USD
CY2019Q3	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	13992000	USD
CY2018Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	9707000	USD
CY2019Q3	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	36987000	USD
CY2018Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	32362000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	416437000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	224289000	USD
CY2019Q3	us-gaap	Assets Assets	1307231000	USD
CY2018Q4	us-gaap	Assets Assets	1080948000	USD
CY2019Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	18693000	USD
CY2018Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	19759000	USD
CY2019Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4104000	USD
CY2018Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3924000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23988000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	59497000	USD
CY2018Q4	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	67618000	USD
CY2019Q3	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	15911000	USD
CY2018Q4	us-gaap	Accounts Payable Other Current AccountsPayableOtherCurrent	16108000	USD
CY2019Q3	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	28335000	USD
CY2018Q4	us-gaap	Self Insurance Reserve Current SelfInsuranceReserveCurrent	28643000	USD
CY2019Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	22594000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	14249000	USD
CY2019Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	7966000	USD
CY2018Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	7623000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	181088000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	157924000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	30000000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	55000000	USD
CY2019Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	16028000	USD
CY2018Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	19128000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	184797000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q3	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	69944000	USD
CY2018Q4	us-gaap	Self Insurance Reserve Noncurrent SelfInsuranceReserveNoncurrent	67381000	USD
CY2019Q3	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	7394000	USD
CY2018Q4	us-gaap	Contract With Customer Refund Liability Noncurrent ContractWithCustomerRefundLiabilityNoncurrent	8078000	USD
CY2019Q3	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2172000	USD
CY2018Q4	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2172000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	26193000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	18550000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	13765000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	15204000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	3819000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	3054000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	535200000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	346491000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	153000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	153000	USD
CY2019Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	221394000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	219435000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	547292000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	516435000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	2731000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2745000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	771570000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	733278000	USD
CY2019Q3	us-gaap	Minority Interest MinorityInterest	461000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	1179000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	772031000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	734457000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1307231000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1080948000	USD
	us-gaap	Profit Loss ProfitLoss	54289000	USD
	us-gaap	Profit Loss ProfitLoss	40563000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31515000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31176000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7548000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1860000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3884000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3830000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	16096000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	417000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	117000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	18000	USD
	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	1975000	USD
	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	2050000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-6187000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-1067000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1448000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1538000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-5234000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-613000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	2330000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-3262000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	304000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	437000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-169000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	1336000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-1066000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	3319000	USD
	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-8121000	USD
	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-8615000	USD
	nhc	Increase Decrease In Due To Third Party Payors IncreaseDecreaseInDueToThirdPartyPayors	-197000	USD
	nhc	Increase Decrease In Due To Third Party Payors IncreaseDecreaseInDueToThirdPartyPayors	207000	USD
	us-gaap	Increase Decrease In Self Insurance Reserve IncreaseDecreaseInSelfInsuranceReserve	2241000	USD
	us-gaap	Increase Decrease In Self Insurance Reserve IncreaseDecreaseInSelfInsuranceReserve	2668000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	8345000	USD
	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	262000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-1439000	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	750715000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	13711000	USD
CY2019Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-29000	USD
CY2019Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17000	USD
	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-1092000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	765000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	666000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	74884000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	77066000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	19670000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	22708000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	15589000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	527000	USD
	nhc	Payments For Proceeds From Unconsolidated Investments PaymentsForProceedsFromUnconsolidatedInvestments	197000	USD
	nhc	Payments For Proceeds From Unconsolidated Investments PaymentsForProceedsFromUnconsolidatedInvestments	-376000	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	5462000	USD
	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	-0	USD
	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	1010000	USD
	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	1180000	USD
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	11187000	USD
	us-gaap	Payments To Acquire Restricted Investments PaymentsToAcquireRestrictedInvestments	9950000	USD
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	41272000	USD
	us-gaap	Proceeds From Sale Of Restricted Investments ProceedsFromSaleOfRestrictedInvestments	4539000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9823000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-27090000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	25000000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	25000000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2920000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2751000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	23240000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22214000	USD
	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	566000	USD
	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	-0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1383000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1327000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	872000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	867000	USD
	nhc	Entrance Fee Deposits Refunds EntranceFeeDepositsRefunds	-684000	USD
	nhc	Entrance Fee Deposits Refunds EntranceFeeDepositsRefunds	-159000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-51899000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-49664000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	13162000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	312000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	54920000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67421000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	68082000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67733000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	59261000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	55599000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	8821000	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	12134000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	68082000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67733000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	734457000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	21269000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-38000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2548000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	424000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	579000	USD
CY2019Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	872000	USD
CY2019Q1	us-gaap	Dividends Common Stock DividendsCommonStock	7652000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2345000	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-86000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-639000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	749000	USD
CY2018Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	260000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	684000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	804000	USD
CY2019Q2	us-gaap	Dividends Common Stock DividendsCommonStock	7966000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	760247000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	19461000	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-85000	USD
CY2019Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	549000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	583000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	340000	USD
CY2019Q3	us-gaap	Dividends Common Stock DividendsCommonStock	7966000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	772031000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	703432000	USD
CY2017Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	-2791000	USD
CY2018Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-108000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2219000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	428000	USD
CY2018Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1067000	USD
CY2018Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	867000	USD
CY2018Q1	us-gaap	Dividends Common Stock DividendsCommonStock	7305000	USD
CY2018Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	691637000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	22461000	USD
CY2018Q2	us-gaap	Dividends Common Stock DividendsCommonStock	7612000	USD
CY2018Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	706770000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21142000	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-55000	USD
CY2018Q3	nhc	Noncontrolling Interest Increase From Capital Contribution NoncontrollingInterestIncreaseFromCapitalContribution	750000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-137000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	361000	USD
CY2018Q3	us-gaap	Dividends Common Stock DividendsCommonStock	7613000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	721218000	USD
CY2019Q3	nhc	Number Of Skilled Nursing Centers NumberOfSkilledNursingCenters	75	pure
CY2019Q3	nhc	Number Of Beds NumberOfBeds	9510	pure
CY2019Q3	nhc	Number Of Assisted Living Facilities NumberOfAssistedLivingFacilities	26	pure
CY2019Q3	nhc	Number Of Homecare Programs NumberOfHomecarePrograms	36	pure
CY2019Q3	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	10	pure
	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify;"><i>Estimates and Assumptions</i></p> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify;"> </p> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; text-align: justify; text-indent: 36pt;">The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and could cause our reported net income to vary significantly from period to period.</p>
CY2019Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	827000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2866000	USD
CY2018Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1098000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3121000	USD
CY2019Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	5727000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	4610000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	7170000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	18991000	USD
CY2018Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	7805000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21056000	USD
CY2019Q3	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	7394000	USD
CY2018Q4	us-gaap	Contract With Customer Refund Liability ContractWithCustomerRefundLiability	8078000	USD
CY2018Q4	us-gaap	Continuing Care Retirement Communities Advance Fees Obligation For Future Services Amount ContinuingCareRetirementCommunitiesAdvanceFeesObligationForFutureServicesAmount	2172000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	235090000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	234827000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	706465000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	697173000	USD
CY2019Q3	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
CY2018Q3	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
	nhc	Revenue From Contract With Customer Including Assessed Tax Percentage RevenueFromContractWithCustomerIncludingAssessedTaxPercentage	1	pure
CY2019Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	5678000	USD
CY2018Q3	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	5548000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	16963000	USD
	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	16633000	USD
CY2019Q3	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	4520000	USD
CY2018Q3	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	3818000	USD
	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	13567000	USD
	nhc	Management And Accounting Services Fees Revenue ManagementAndAccountingServicesFeesRevenue	11265000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6663000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8467000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	22774000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	22931000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	22774000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	22730000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	28633000	USD
CY2019Q3	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	1528000	USD
CY2018Q3	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	1716000	USD
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	4667000	USD
	us-gaap	Insurance Services Revenue InsuranceServicesRevenue	5362000	USD
CY2019Q3	nhc	Miscellaneous Revenue MiscellaneousRevenue	251000	USD
CY2018Q3	nhc	Miscellaneous Revenue MiscellaneousRevenue	417000	USD
	nhc	Miscellaneous Revenue MiscellaneousRevenue	841000	USD
	nhc	Miscellaneous Revenue MiscellaneousRevenue	996000	USD
CY2019Q3	nhc	Other Revenues OtherRevenues	11977000	USD
CY2018Q3	nhc	Other Revenues OtherRevenues	11499000	USD
	nhc	Other Revenues OtherRevenues	36038000	USD
	nhc	Other Revenues OtherRevenues	34256000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	22002000	USD
CY2019Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	141844000	USD
CY2019Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2747000	USD
CY2018Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2724000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7548000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1860000	USD
CY2019Q3	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	2049000	USD
CY2018Q3	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	1777000	USD
	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	5911000	USD
	nhc	Dividends And Other Net Realized Gains And Losses On Sales Of Securities DividendsAndOtherNetRealizedGainsAndLossesOnSalesOfSecurities	5374000	USD
CY2019Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	1867000	USD
CY2018Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	1916000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5502000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5492000	USD
CY2019Q3	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	0	USD
CY2018Q3	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	2050000	USD
	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	1975000	USD
	nhc	Gain Loss On Acquisition Of Equity Method Investment GainLossOnAcquisitionOfEquityMethodInvestment	2050000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	20936000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11056000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	235090000	USD
CY2019Q3	nhc	Other Revenues OtherRevenues	11977000	USD
CY2019Q3	us-gaap	Revenues Revenues	247067000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	152175000	USD
CY2019Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	66730000	USD
CY2019Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10167000	USD
CY2019Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10663000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	764000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	240499000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	6568000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6663000	USD
CY2019Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	9312000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	22543000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	234827000	USD
CY2018Q3	nhc	Other Revenues OtherRevenues	11499000	USD
CY2018Q3	us-gaap	Revenues Revenues	246326000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	149188000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	64507000	USD
CY2018Q3	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	10190000	USD
CY2018Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	10437000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	1170000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	235492000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10834000	USD
CY2018Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	8467000	USD
CY2018Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3486000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	22787000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	706465000	USD
	nhc	Other Revenues OtherRevenues	36038000	USD
	us-gaap	Revenues Revenues	742503000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	441441000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	203760000	USD
	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	30602000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	31515000	USD
	us-gaap	Interest Expense InterestExpense	2644000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	709962000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	32541000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	20936000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	16096000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	69573000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	697173000	USD
	nhc	Other Revenues OtherRevenues	34256000	USD
	us-gaap	Revenues Revenues	731429000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	434749000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	192268000	USD
	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	30691000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	31176000	USD
	us-gaap	Interest Expense InterestExpense	3663000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	692547000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	38882000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11056000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	417000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	50355000	USD
CY2014Q2	us-gaap	Capital Leases Future Minimum Payments Net Minimum Payments1 CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1	5200000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	17143000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	208785000	USD
CY2019Q3	nhc	Lease Rightofuse Asset LeaseRightofuseAsset	225928000	USD
CY2019Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4104000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23988000	USD
CY2019Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	16028000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	184797000	USD
CY2019Q3	nhc	Lease Liability LeaseLiability	228917000	USD
CY2019Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y4M24D
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y4M24D
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.060	pure
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	962000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2911000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	319000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1001000	USD
CY2019Q3	nhc	Finance Lease Cost FinanceLeaseCost	1281000	USD
	nhc	Finance Lease Cost FinanceLeaseCost	3912000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	8944000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	27034000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	965000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	2895000	USD
CY2019Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	258000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	673000	USD
CY2019Q3	nhc	Total Operating Lease Cost TotalOperatingLeaseCost	10167000	USD
	nhc	Total Operating Lease Cost TotalOperatingLeaseCost	30602000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	11448000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	5200000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	35015000	USD
	us-gaap	Lease Cost LeaseCost	34514000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	5200000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	35674000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5200000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	35326000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	5200000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	34489000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	2167000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	34345000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	82711000	USD
CY2019Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	22967000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	257560000	USD
CY2019Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	2835000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	48775000	USD
CY2019Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	20132000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	208785000	USD
CY2019Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	4104000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	23988000	USD
CY2019Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	16028000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	184797000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	27034000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1001000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2920000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15275709
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15225654
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15267250
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15221217
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	19461000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21142000	USD
	us-gaap	Net Income Loss NetIncomeLoss	54441000	USD
	us-gaap	Net Income Loss NetIncomeLoss	40812000	USD
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.39
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.57
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15275709
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15225654
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15267250
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15221217
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	97908
CY2018Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	16432
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	83058
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	9475
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15373617
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15242086
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15350308
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15230692
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	19461000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	21142000	USD
	us-gaap	Net Income Loss NetIncomeLoss	54441000	USD
	us-gaap	Net Income Loss NetIncomeLoss	40812000	USD
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.27
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.55
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.68
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1048275
CY2019Q3	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	176275000	USD
CY2019Q3	us-gaap	Available For Sale Securities AvailableForSaleSecurities	305876000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	206243000	USD
CY2018Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	312816000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	11139000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	11153000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	11448000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	11401000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	90140000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	92120000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	98487000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	97430000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	44820000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	46284000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	64932000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	62527000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	0	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	0	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	1200000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1235000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	146099000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	149557000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	176067000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	172593000	USD
CY2019Q3	nhc	Equity Securities Fv Ni Gross Unrealized Gain EquitySecuritiesFvNiGrossUnrealizedGain	126149000	USD
CY2018Q4	nhc	Equity Securities Fv Ni Gross Unrealized Gain EquitySecuritiesFvNiGrossUnrealizedGain	110081000	USD
CY2019Q3	nhc	Equity Securities Fv Ni Gross Unrealized Loss EquitySecuritiesFvNiGrossUnrealizedLoss	6000	USD
CY2018Q4	nhc	Equity Securities Fv Ni Gross Unrealized Loss EquitySecuritiesFvNiGrossUnrealizedLoss	34000	USD
CY2019Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	9312000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	16096000	USD
CY2018Q3	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	3486000	USD
	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	417000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3568000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	335000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	110000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3809000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	41272000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	4539000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	117000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	18000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	0	USD
CY2019Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q3	us-gaap	Long Term Debt LongTermDebt	30000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	55000000	USD
CY2019Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	340000	USD
CY2018Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	361000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1448000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1538000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3981000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0230	pure
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0246	pure
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.174	pure
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.161	pure
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P2Y3M18D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0273	pure
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0329	pure
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	110265
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1239407
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	71.19
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	61.39
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	68291
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	54.31
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	118000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	72.11
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1163381
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	71.16
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	53628
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	77.89
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	332852
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	71.56
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	85000
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	72.94
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	799157
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	71.25
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	8468000	USD
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	209029
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	68.05
CY2019Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	2885000	USD
CY2019Q3	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	71.25
	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P2Y6M
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3167000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.140	pure
	nhc	Direct Business Coverage Statutory Limits DirectBusinessCoverageStatutoryLimits	1000000	USD
CY2019Q3	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2064000	USD
CY2019Q3	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	793000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1700000	USD
CY2018Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.075	pure
CY2018Q3	nhc	Effective Income Tax Rate Reconciliation Gain On Acquisition Of Equity Method Investment Amount Total EffectiveIncomeTaxRateReconciliationGainOnAcquisitionOfEquityMethodInvestmentAmountTotal	547000	USD
CY2018Q3	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2222000	USD
CY2018Q3	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	1434000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	15284000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.220	pure
	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2064000	USD
	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	793000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9792000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.195	pure
	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	945000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.019	pure
	nhc	Effective Income Tax Rate Reconciliation Gain On Acquisition Of Equity Method Investment Amount Total EffectiveIncomeTaxRateReconciliationGainOnAcquisitionOfEquityMethodInvestmentAmountTotal	547000	USD
	nhc	Income Tax Reconciliation Expiration Of Statute Of Limitations IncomeTaxReconciliationExpirationOfStatuteOfLimitations	2222000	USD
	nhc	Income Tax Reconciliation Return To Provision IncomeTaxReconciliationReturnToProvision	1434000	USD
	us-gaap	Open Tax Year OpenTaxYear	2016
CY2019Q3	us-gaap	Self Insurance Reserve SelfInsuranceReserve	98279000	USD
CY2018Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	96024000	USD
	nhc	Primary Insurance Coverage Amount Per Incident PrimaryInsuranceCoverageAmountPerIncident	1000000.0	USD
	nhc	Primary Insurance Coverage Amount Per Location PrimaryInsuranceCoverageAmountPerLocation	3000000.0	USD
	nhc	Annual Excess Coverage AnnualExcessCoverage	9000000.0	USD

Files In Submission

Name	View Source	Status
0001437749-19-021585-index-headers.html	Edgar Link	pending
0001437749-19-021585-index.html	Edgar Link	pending
0001437749-19-021585.txt	Edgar Link	pending
0001437749-19-021585-xbrl.zip	Edgar Link	pending
ex_162173.htm	Edgar Link	pending
ex_162174.htm	Edgar Link	pending
ex_162175.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nhc-20190930.xsd	Edgar Link	pending
nhc-20190930_cal.xml	Edgar Link	unprocessable
nhc-20190930_def.xml	Edgar Link	unprocessable
nhc-20190930_lab.xml	Edgar Link	unprocessable
nhc-20190930_pre.xml	Edgar Link	unprocessable
nhc20190930_10q.htm	Edgar Link	pending
nhc20190930_10qimg001.jpg	Edgar Link	pending
nhc20190930_10q_htm.xml	Edgar Link	completed
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$NHC
NATIONAL HEALTHCARE CORP Stock $nhc

2019 Q3 Form 10-Q Financial Statement

#000143774919021585 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NHC NATIONAL HEALTHCARE CORP Stock $nhc

2019 Q3 Form 10-Q Financial Statement

#000143774919021585 Filed on November 05, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NHC
NATIONAL HEALTHCARE CORP Stock $nhc