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Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Income tax expense | $ (75)us-gaap_IncomeTaxExpenseBenefit |  | $ 74 us-gaap_IncomeTaxExpenseBenefit |  | $ (6,891)us-gaap_IncomeTaxExpenseBenefit |
Assets Held-for-sale |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of sold properties | 25 nnn_NumberOfDisposedPropertiesContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 0 nnn_NumberOfDisposedPropertiesContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 0 nnn_NumberOfDisposedPropertiesContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |
Gain on disposition of real estate | 11,587 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 173 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 0 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |
Income tax expense | (318)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | (66)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |
Gain on disposition of real estate, net of income tax expense | 11,269 nnn_GainLossOnDispositionOfAssetsParentPortionContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 107 nnn_GainLossOnDispositionOfAssetsParentPortionContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 0 nnn_GainLossOnDispositionOfAssetsParentPortionContinuingOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |
Gain (Loss) on Disposition of Assets, Total, Continuing and Discontinued Operations | 11,424 nnn_GainLossOnDispositionOfAssetsTotalContinuingAndDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 5,595 nnn_GainLossOnDispositionOfAssetsTotalContinuingAndDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |  | 10,956 nnn_GainLossOnDispositionOfAssetsTotalContinuingAndDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember |
Assets Held-for-sale | Discontinued operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposition of real estate | 155 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | [1] | 6,272 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | [1] | 10,956 us-gaap_GainLossOnDispositionOfAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | [1]
Income tax expense | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | $ (784)us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |
Number of sold properties | 2 nnn_NumberOfDisposedPropertiesDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | 35 nnn_NumberOfDisposedPropertiesDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | 34 nnn_NumberOfDisposedPropertiesDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = us-gaap_AssetsHeldForSaleMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |
[1] | Amount includes the recognition of deferred gains on previously sold properties.

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