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Subsequent Events (Details) - Series F Preferred Stock | 1 Months Ended
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Oct. 31, 2021 USD ($) $ / shares
Subsequent Event [Line Items] |
Preferred stock redemption price including accrued dividends | $ 25.111944
Preferred stock redemption price per depository share | $ 25.00
Dividend rate | 5.20%
Preferred stock redemption charge | $ | $ 10,897,000

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- Definition Preferred Stock Redemption Price Including Accrued Dividends + References No definition available. + Details
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Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Preferred Stock Redemption Price Per Depository Share + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=122038299&loc=d3e42851-122695 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |