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Real Estate (Summary of NHC Percentage Rent) (Details) - National Healthcare Corporation [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Total percentage rent income | $ 924 | $ 853 | $ 2,135 | $ 1,991
Current year [Member] |  |  |  |
Total percentage rent income | 924 | 853 | 1,801 | 1,706
Prior year final certification [Member] |  |  |  |
Total percentage rent income | $ 0 | $ 0 | $ 334 | $ 285

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- Definition This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_PercentageRent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | srt_MajorCustomersAxis=nhi_NationalHealthcareCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=nhi_FinalDeterminationBasedOnCurrentYearRevenuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentAxis=nhi_FinalDeterminationBasedOnPriorYearRevenuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |