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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Series C Preferred Stock | Series D Preferred Stock | Series E Preferred Stock | Total Stockholders’ Equity | Total Stockholders’ Equity Series C Preferred Stock | Total Stockholders’ Equity Series D Preferred Stock | Total Stockholders’ Equity Series E Preferred Stock | Preferred Stock Series C Preferred Stock | Preferred Stock Series D Preferred Stock | Preferred Stock Series E Preferred Stock | Common Stock | Capital in Excess of Par Value | Capital in Excess of Par Value Series C Preferred Stock | Capital in Excess of Par Value Series D Preferred Stock | Capital in Excess of Par Value Series E Preferred Stock | Retained Earnings (Loss) | Retained Earnings (Loss) Series C Preferred Stock | Retained Earnings (Loss) Series D Preferred Stock | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests
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Balances at at Dec. 31, 2011 | $ 2,003,876 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | $ 2,002,498 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | $ 92,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 1,049 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,958,225 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (44,946)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (3,830)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 1,378 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 141,937 us-gaap_ProfitLoss |  |  |  | 142,015 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  | 142,015 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (78)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid |  | (1,979)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | (15,449)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  |  | (1,979)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (15,449)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  | (1,979)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (15,449)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Common stock dividends declared and paid | (155,733)us-gaap_DividendsCommonStockCash |  |  |  | (155,733)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 4 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11,758 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (167,495)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | (3,098)us-gaap_StockRedeemedOrCalledDuringPeriodValue | (92,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | (92,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | (92,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  | 3,098 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (3,098)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Issuance of stock | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 277,645 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | 277,645 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 287,500 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (9,855)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |
Issuance of common stock - stock purchase program | 44,412 nnn_SharesDiscountedStockPurchaseProgram |  |  |  | 44,412 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 17 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 44,395 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common stock - ATM equity program | 129,092 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  | 129,092 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 43 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 129,049 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | 335 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  | 335 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 4 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 331 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Equity component of convertible debt | (41,486)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  |  |  | (41,486)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (41,486)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Stock issuance costs | (2,265)nnn_StockIssuanceCosts |  |  |  | (2,265)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (2,265)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance incentive plan | (451)nnn_PerformanceIncentivePlans |  |  |  | (451)nnn_PerformanceIncentivePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (451)nnn_PerformanceIncentivePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Amortization of deferred compensation | 7,370 nnn_AmortizationOfDeferredCompensation |  |  |  | 7,370 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | 7,370 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 231 nnn_AmortizationOfInterestRateHedges |  |  |  | 231 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 231 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Fair value forward starting swaps | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain – commercial mortgage residual interests | 1,132 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 1,132 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,132 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Valuation adjustments – available-for-sale securities | 85 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax |  |  |  | 85 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balances at at Dec. 31, 2012 | 2,297,585 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 2,296,285 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 287,500 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,117 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,101,002 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (90,952)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (2,382)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,300 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 160,085 us-gaap_ProfitLoss |  |  |  | 160,145 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  | 160,145 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | (60)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid | (8,876)us-gaap_DividendsPreferredStockCash |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | (8,876)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  | (8,876)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Common stock dividends declared and paid | (174,162)us-gaap_DividendsCommonStockCash |  |  |  | (174,162)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 4 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,941 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (189,107)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | 0 us-gaap_StockRedeemedOrCalledDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock | 744 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  | 277,644 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | 744 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 277,644 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  | 287,500 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 744 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (9,856)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Issuance of common stock - stock purchase program | 10,461 nnn_SharesDiscountedStockPurchaseProgram |  |  |  | 10,461 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 3 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 10,458 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common stock - ATM equity program | 242,418 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  | 242,418 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 70 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 242,348 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common stock - conversion of 2028 Notes | 85,224 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities |  |  |  | 85,224 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 24 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 85,200 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | (210)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  | (210)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 3 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (213)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Equity component of convertible debt | (93,450)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt |  |  |  | (93,450)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (93,450)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Stock issuance costs | (3,774)nnn_StockIssuanceCosts |  |  |  | (3,774)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (3,774)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 6,715 nnn_AmortizationOfDeferredCompensation |  |  |  | 6,715 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | 6,715 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 438 nnn_AmortizationOfInterestRateHedges |  |  |  | 438 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 438 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Fair value forward starting swaps | (3,141)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | (3,141)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,141)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Unrealized gain – commercial mortgage residual interests | (438)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | (438)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (438)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Valuation adjustments – available-for-sale securities | 69 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax |  |  |  | 69 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Distributions to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | (949)us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  | 949 us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Balances at at Dec. 31, 2013 | 2,778,285 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | 2,777,045 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 287,500 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 287,500 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 1,221 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,353,166 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (147,837)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (4,505)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,240 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings | 191,170 us-gaap_ProfitLoss |  |  |  | 190,601 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  | 190,601 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  | 569 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Dividends declared and paid: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends declared and paid | (16,387)us-gaap_DividendsPreferredStockCash |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember |  | (16,387)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  | (16,387)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (19,047)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Common stock dividends declared and paid | (192,711)us-gaap_DividendsCommonStockCash |  |  |  | (192,711)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 3 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11,443 us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (204,157)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Redemption of 3,680,000 shares of Series C Preferred Stock | 0 us-gaap_StockRedeemedOrCalledDuringPeriodValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock | 209,240 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  | 209,240 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 55 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 209,185 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common stock - stock purchase program | 3,371 nnn_SharesDiscountedStockPurchaseProgram |  |  |  | 3,371 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 1 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,370 nnn_SharesDiscountedStockPurchaseProgram / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of common stock - ATM equity program | 137,115 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  | 137,115 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 38 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 137,077 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Issuance of shares of restricted common stock | (309)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross |  |  |  | (309)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  | 4 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (313)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Stock issuance costs | (10,683)nnn_StockIssuanceCosts |  |  |  | (10,683)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | (10,683)nnn_StockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Performance incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred compensation | 8,433 nnn_AmortizationOfDeferredCompensation |  |  |  | 8,433 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  | 8,433 nnn_AmortizationOfDeferredCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |
Amortization of interest rate hedges | 1,129 nnn_AmortizationOfInterestRateHedges |  |  |  | 1,129 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,129 nnn_AmortizationOfInterestRateHedges / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Fair value forward starting swaps | (6,312)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  |  | (6,312)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,312)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Unrealized gain – commercial mortgage residual interests | 875 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  | 875 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 875 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Realized gain – commercial mortgage residual interests | 163 nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonCommercialMortgageResidualInterestsDuringPeriodNetofTax |  |  |  | 163 nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonCommercialMortgageResidualInterestsDuringPeriodNetofTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163 nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonCommercialMortgageResidualInterestsDuringPeriodNetofTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Valuation adjustments – available-for-sale securities | 111 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax |  |  |  | 111 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 111 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Realized gain – available-for-sale securities | (119)nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesArisingDuringPeriodNetofTax |  |  |  | (119)nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesArisingDuringPeriodNetofTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (119)nnn_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesArisingDuringPeriodNetofTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Distributions to noncontrolling interests | (1,232)us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,232)us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balances at at Dec. 31, 2014 | $ 3,083,092 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  | $ 3,082,515 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 287,500 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 287,500 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 1,322 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2,711,678 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | $ (196,827)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | $ (8,658)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 577 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember

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