Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 30,013us-gaap_ProfitLoss	$ 23,856us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,014us-gaap_DepreciationNonproduction	9,237us-gaap_DepreciationNonproduction
Amortization	833	343
Straight-line rental income	(6,089)us-gaap_StraightLineRent	(4,195)us-gaap_StraightLineRent
Write-off of debt issuance costs	0	2,145
Share-based compensation	1,464	1,349
Income from equity-method investee	229	(158)
Change in operating assets and liabilities:
Equity-method investment and other assets	634	(352)
Accounts payable and accrued expenses	(3,290)	(1,149)
Deferred income	1,756	(2,200)
Net cash provided by operating activities	38,564	28,876
Cash flows from investing activities:
Investment in mortgage and other notes receivable	(40,773)	(1,131)
Collection of mortgage and other notes receivable	2,619	899
Investment in real estate	(10)us-gaap_PaymentsToAcquireRealEstate	(16,307)us-gaap_PaymentsToAcquireRealEstate
Investment in real estate development	(3,202)	(2,572)
Investment in renovations of existing real estate	(1,695)us-gaap_PaymentsForCapitalImprovements	(1,311)us-gaap_PaymentsForCapitalImprovements
Payment of real estate purchase liability	0	(1,600)
Net cash used in investing activities	(43,061)	(22,022)
Cash flows from financing activities:
Net change in borrowings under revolving credit facilities	(266,500)	(60,000)
Proceeds from convertible senior notes	0us-gaap_ProceedsFromConvertibleDebt	200,000us-gaap_ProceedsFromConvertibleDebt
Proceeds from issuance of secured debt	78,084	0
Borrowings on term loan	225,000us-gaap_ProceedsFromBankDebt	130,000us-gaap_ProceedsFromBankDebt
Payments on term loans	(183)us-gaap_RepaymentsOfLongTermDebt	(250,275)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs	(1,502)us-gaap_PaymentsOfDebtIssuanceCosts	(6,921)us-gaap_PaymentsOfDebtIssuanceCosts
Equity offerring costs	(200)nhi_EquityIssuanceCosts	0nhi_EquityIssuanceCosts
Proceeds from exercise of stock options	(1)	0
Distributions to noncontrolling interest	(436)us-gaap_PaymentsToMinorityShareholders	(432)us-gaap_PaymentsToMinorityShareholders
Dividends paid to stockholders	(28,864)us-gaap_PaymentsOfDividends	(24,293)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	5,400	(11,921)
(Decrease) increase in cash and cash equivalents	903	(5,067)
Cash and cash equivalents, beginning of year	3,287	11,312
Cash and cash equivalents, end of year	4,190	6,245
Supplemental disclosure of cash flow information:
Interest Paid	7,194us-gaap_InterestPaid	4,408us-gaap_InterestPaid
Supplemental schedule of non-cash investing and financing activities:
Tax deferred exchange funds applied to investment in real estate	0	23,813
Conditional consideration in asset acquisition	0	3,000
Accounts payable related to investments in real estate	893	2,296
Reclass of note balance into real estate investment	$ 255	$ 0

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

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- Definition

The cash inflow from proceeds from sale of receivables arising from the mortgage note on real estate; includes collections on mortgage notes receivable that are not classified as operating cash flows.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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