XML 84 R66.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Share-Based Compensation (Schedule of Non-Vested Share Activity) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-vested stock options, January 1 | 353,348 |  |
Non-vested stock options, December 31 | 393,351 | 353,348 |
Weighted Average Grant Date Fair Value, Non-vested stock options, January 1 | $ 3.99 |  |
Weighted Average Grant Date Fair Value Per Share, Options granted | 5.76 | $ 3.65 | $ 4.74
Weighted Average Grant Date Fair Value, Non-vested stock options, December 31 | $ 5.10 | $ 3.99 |
2012 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted | 495,000 | 470,000 | 450,000
Options vested | (441,661) |  |
Non-vested options canceled | 6,668 |  |
Weighted Average Grant Date Fair Value Per Share, Options granted | $ 5.76 |  |
Weighted Average Grant Date Fair Value Per Share, Options vested | 4.98 |  |
Weighted Average Grant Date Fair Value Per Share, Options canceled | $ 3.61 |  |
2005 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options granted |  |  | 20,000
Options vested | (6,668) |  |
Weighted Average Grant Date Fair Value Per Share, Options vested | 4.91 |  |

X
- Definition The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. + References No definition available. + Details
Name: | nhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber
Namespace Prefix: | nhi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares that are canceled, forfeitures or expired. + References No definition available. + Details
Name: | nhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberCanceledExpiredorForfeited
Namespace Prefix: | nhi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in the number of shares (or other type of equity) issuable under stock option plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units. + References No definition available. + Details
Name: | nhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedInPeriod
Namespace Prefix: | nhi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value as of grant date pertaining to a stock option award for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with terms of the arrangement. + References No definition available. + Details
Name: | nhi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | nhi_
Data Type: | xbrli:sharesItemType
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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=nhi_TwoThousandTwelveStockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nhi_TwoThousandFivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |