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Organization and Summary of Significant Accounting Policies (Computation of Basic and Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to NNN | $ 53,757 us-gaap_NetIncomeLoss | $ 47,940 us-gaap_NetIncomeLoss | $ 45,571 us-gaap_NetIncomeLoss | $ 43,333 us-gaap_NetIncomeLoss | $ 44,241 us-gaap_NetIncomeLoss | $ 44,352 us-gaap_NetIncomeLoss | $ 37,486 us-gaap_NetIncomeLoss | $ 34,066 us-gaap_NetIncomeLoss | $ 190,601 us-gaap_NetIncomeLoss | $ 160,145 us-gaap_NetIncomeLoss | $ 142,015 us-gaap_NetIncomeLoss
Less: Excess of redemption value over carrying value of Series C preferred shares redeemed |  |  |  |  |  |  |  |  | 0 us-gaap_StockRedeemedOrCalledDuringPeriodValue | 0 us-gaap_StockRedeemedOrCalledDuringPeriodValue | (3,098)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Net earnings attributable to common stockholders |  |  |  |  |  |  |  |  | 155,167 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 132,222 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 121,489 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Less: Earnings attributable to unvested restricted shares |  |  |  |  |  |  |  |  | (773)nnn_EarningsAttributableToUnvestedRestrictedSharesUsingTwoClassMethod | (718)nnn_EarningsAttributableToUnvestedRestrictedSharesUsingTwoClassMethod | (741)nnn_EarningsAttributableToUnvestedRestrictedSharesUsingTwoClassMethod
Net earnings used in basic and diluted earnings per share |  |  |  |  |  |  |  |  | $ 154,394 nnn_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted | $ 131,504 nnn_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted | $ 120,748 nnn_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
Weighted average number of shares outstanding |  |  |  |  |  |  |  |  | 125,221,358 nnn_WeightedAverageNumberOfSharesOutstanding | 118,969,771 nnn_WeightedAverageNumberOfSharesOutstanding | 107,873,577 nnn_WeightedAverageNumberOfSharesOutstanding
Less: Unvested restricted shares |  |  |  |  |  |  |  |  | (467,968)us-gaap_WeightedAverageNumberOfSharesRestrictedStock | (448,590)us-gaap_WeightedAverageNumberOfSharesRestrictedStock | (654,127)us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Less: Unvested contingent shares |  |  |  |  |  |  |  |  | (495,832)us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | (317,033)us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | (254,294)us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Weighted average number of shares outstanding used in basic earnings per share |  |  |  |  |  |  |  |  | 124,257,558 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 118,204,148 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 106,965,156 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Convertible debt (in shares) |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 1,468,559 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 1,987,842 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Other (in shares) |  |  |  |  |  |  |  |  | 452,668 nnn_IncrementalCommonSharesAttributableToDilutiveEffectOther | 192,117 nnn_IncrementalCommonSharesAttributableToDilutiveEffectOther | 164,517 nnn_IncrementalCommonSharesAttributableToDilutiveEffectOther
Weighted average number of shares outstanding used in diluted earnings per share |  |  |  |  |  |  |  |  | 124,710,226 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 119,864,824 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 109,117,515 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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