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Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Schedule II - Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | NATIONAL HEALTH INVESTORS, INC. SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2018, 2017, AND 2016 (in thousands)
| Balance |  | Additions |  |  |  |
| Beginning |  | Charged to Costs |  |  |  | Balance
| of Period |  | and Expenses 1 |  | Deductions |  | End of Period
For the year ended December 31, 2018 |  |  |  |  |  |  |
Loan loss allowance | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
For the year ended December 31, 2017 |  |  |  |  |  |  |
Loan loss allowance | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
For the year ended December 31, 2016 |  |  |  |  |  |  |
Loan loss allowance | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
1 In the Consolidated Statements of Income, we report the net amount of our provision for loan and realty losses and our recoveries of amounts previously written down.

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- Definition Schedule II - Valuation and Qualifying Accounts [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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