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Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Nov. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 2012 | Mar. 31, 2013 | Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares | 5,462,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 5,493,595 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 29,013 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 40,460 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |
Underwriters over allotment of shares | 712,500 nnn_UnderwritersOverAllotmentOfShares | 1,500,000 nnn_UnderwritersOverAllotmentOfShares |  |  |  |  |  |  |  |
Shares Issued, price per share | $ 38.16 us-gaap_SharesIssuedPricePerShare |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 199,961 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 360,072 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 267,613 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 185,223 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |
Stock issuance costs | 8,488 nnn_StockIssuanceCosts | 10,683 nnn_StockIssuanceCosts |  | 3,774 nnn_StockIssuanceCosts |  | 2,265 nnn_StockIssuanceCosts |  |  |  |
Issuance of common stock |  | 209,240 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 744 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 833 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |
Stock issuance costs |  | 10,726 us-gaap_PaymentsOfStockIssuanceCosts |  | 13,529 us-gaap_PaymentsOfStockIssuanceCosts |  | 12,237 us-gaap_PaymentsOfStockIssuanceCosts |  |  |  |
2012 ATM Equity Program |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  | 4,676,542 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  | 4,282,298 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  |  |  |
Shares issued |  | 8,958,840 us-gaap_SharesIssued / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  |  |  |  | 9,000,000 nnn_EquityProgramNumberOfSharesAuthorizedToBeIssued / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  |
Average stock price per share |  |  |  | $ 32.60 nnn_SaleOfStockAverageStockPricePerShare / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  | $ 29.64 nnn_SaleOfStockAverageStockPricePerShare / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  |  |  |
Issuance of common stock |  |  |  | 152,435 us-gaap_StockIssuedDuringPeriodValueNewIssues / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  | 126,947 us-gaap_StockIssuedDuringPeriodValueNewIssues / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember |  |  |  |
Stock issuance costs |  |  |  | 2,161 us-gaap_PaymentsOfStockIssuanceCosts / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember | [1] | 2,145 us-gaap_PaymentsOfStockIssuanceCosts / nnn_EquityPlanNameAxis = nnn_AtmEquityProgramMember | [1] |  |  |
2013 ATM Equity Program |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares |  | 3,758,362 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  | 2,280,450 us-gaap_StockIssuedDuringPeriodSharesNewIssues / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  |  |  |  |  |
Shares issued |  | 6,038,812 us-gaap_SharesIssued / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  |  |  |  |  |  |  |
Number of shares authorized to be issued |  |  |  |  |  |  |  |  | 9,000,000 nnn_EquityProgramNumberOfSharesAuthorizedToBeIssued / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |
Average stock price per share |  | $ 35.90 nnn_SaleOfStockAverageStockPricePerShare / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  | $ 37.80 nnn_SaleOfStockAverageStockPricePerShare / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  |  |  |  |  |
Issuance of common stock |  | 134,919 us-gaap_StockIssuedDuringPeriodValueNewIssues / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  | 86,208 us-gaap_StockIssuedDuringPeriodValueNewIssues / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember |  |  |  |  |  |
Stock issuance costs |  | 2,195 us-gaap_PaymentsOfStockIssuanceCosts / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember | [1] | 1,613 us-gaap_PaymentsOfStockIssuanceCosts / nnn_EquityPlanNameAxis = nnn_A2013ATMEquityProgramMember | [1] |  |  |  |  |
DRIP |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 14,817 us-gaap_ProceedsFromIssuanceOfCommonStock / nnn_EquityPlanNameAxis = nnn_DripMember |  | $ 25,407 us-gaap_ProceedsFromIssuanceOfCommonStock / nnn_EquityPlanNameAxis = nnn_DripMember |  | $ 56,102 us-gaap_ProceedsFromIssuanceOfCommonStock / nnn_EquityPlanNameAxis = nnn_DripMember |  |  |  |
Shares of common stock |  | 422,406 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / nnn_EquityPlanNameAxis = nnn_DripMember |  | 764,891 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / nnn_EquityPlanNameAxis = nnn_DripMember |  | 2,101,644 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / nnn_EquityPlanNameAxis = nnn_DripMember |  |  |  |
Shares reserved for future issuance, dividend reinvestment plan |  |  |  |  |  |  |  |  |  | 16,000,000 nnn_StockAuthorizedSharesEmployeeDividendReinvestmentAndStockPurchasePlan / nnn_EquityPlanNameAxis = nnn_DripMember
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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