XML 50 R40.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Derivatives (Terminated Derivatives) (Details) - Forward Swap Member $ in Thousands | Sep. 30, 2021 USD ($) Instrument | Mar. 31, 2020 USD ($) Instrument | Sep. 30, 2018 USD ($) Instrument | Sep. 30, 2017 USD ($) Instrument | Dec. 31, 2016 USD ($) Instrument | Oct. 31, 2015 USD ($) Instrument | May 31, 2014 USD ($) Instrument
--- | --- | --- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of interest rate derivatives terminated | Instrument |  | 2 | 3 | 2 | 2 | 2 | 4 | 3
Aggregate Notional Amount |  | $ 120,000 | $ 200,000 | $ 250,000 | $ 250,000 | $ 180,000 | $ 300,000 | $ 225,000
Liability Fair Value When Terminated |  | 1,584 | 13,141 |  | 7,690 |  | 13,369 | 6,312
Asset Fair Value When Terminated |  |  |  | (4,080) |  | (13,352) |  |
Fair Value Deferred In Other Comprehensive Income | [1] | $ 1,584 | $ 13,141 | $ (4,080) | $ 7,688 | $ (13,345) | $ 13,369 | $ 6,312
[1] |
(1) | The amount reported in accumulated other comprehensive income (loss) will be reclassified to interest expense as interest payments are made on the related notes payable.

X
- Definition Number of interest rate derivative instruments terminated by the entity during the period. + References No definition available. + Details
Name: | nnn_NumberOfInterestRateDerivativesTerminated
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126966630&loc=d3e41228-113958 + Details
Name: | us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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