XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Debt (Schedule of Interest Rate Derivatives) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Interest Rate Swap, Date Entered, May 2012 [Member] |  |
Derivative [Line Items] |  |
Derivative, Inception Date | May 31, 2012 |
Derivative, Maturity Date | Apr. 30, 2019 |
Derivative, Fixed Interest Rate | 2.84% |
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR |
Derivative, Notional Amount | $ 40,000 |
Interest Rate Swap, Date Entered, June 2013 [Member] |  |
Derivative [Line Items] |  |
Derivative, Inception Date | Jun. 30, 2013 |
Derivative, Maturity Date | Jun. 30, 2020 |
Derivative, Fixed Interest Rate | 3.41% |
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR |
Derivative, Notional Amount | $ 80,000 |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 459 |
Interest Rate Swap, Date Entered, March 2014 [Member] |  |
Derivative [Line Items] |  |
Derivative, Inception Date | Mar. 31, 2014 |
Derivative, Maturity Date | Jun. 30, 2020 |
Derivative, Fixed Interest Rate | 3.46% |
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR |
Derivative, Notional Amount | $ 130,000 |
Interest Rate Cash Flow Hedge Liability at Fair Value | 607 |
Fair Value, Inputs, Level 2 [Member] |  |
Derivative [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 1,332 | $ 159
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap, Date Entered, May 2012 [Member] |  |
Derivative [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 266 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nhi_InterestRateSwapDateEnteredMay2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nhi_InterestRateSwapDateEnteredJune2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nhi_InterestRateSwapDateEnteredMarch2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |