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Real Estate (Real Estate Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Real Estate [Abstract] |  |  |  |
Impairment losses – real estate and other charges, net of recoveries | $ 10,692 | $ 3,635 | $ 21,124 | $ 9,718

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- Definition Impairment Losses and Other Charges, Net of Recoveries + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration