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Schedule III - Real Estate and Accumulated Depreciation and Amortization Notes to Schedule III (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |
Balance at the beginning of year | $ 4,686,844 us-gaap_RealEstateGrossAtCarryingValue |  | $ 4,145,368 us-gaap_RealEstateGrossAtCarryingValue | $ 3,531,845 us-gaap_RealEstateGrossAtCarryingValue
Acquisitions, completed construction and tenant improvements | 601,168 us-gaap_RealEstateOtherAcquisitions |  | 602,836 us-gaap_RealEstateOtherAcquisitions | 701,054 us-gaap_RealEstateOtherAcquisitions
Disposition of land, buildings, and leasehold interests | (50,938)us-gaap_RealEstateCostOfRealEstateSold |  | (57,254)us-gaap_RealEstateCostOfRealEstateSold | (77,219)us-gaap_RealEstateCostOfRealEstateSold
Provision for loss on impairment of real estate | (823)us-gaap_ImpairmentOfRealEstate |  | (4,106)us-gaap_ImpairmentOfRealEstate | (10,312)us-gaap_ImpairmentOfRealEstate
Balance at the close of year | 5,236,251 us-gaap_RealEstateGrossAtCarryingValue |  | 4,686,844 us-gaap_RealEstateGrossAtCarryingValue | 4,145,368 us-gaap_RealEstateGrossAtCarryingValue
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Balance at the beginning of year | 418,136 us-gaap_RealEstateAccumulatedDepreciation |  | 333,778 us-gaap_RealEstateAccumulatedDepreciation | 270,621 us-gaap_RealEstateAccumulatedDepreciation
Disposition of land, buildings, and leasehold interests | (9,153)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold |  | (6,778)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold | (6,980)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Depreciation and amortization expense | 104,192 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense |  | 91,136 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense | 70,137 us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Balance at the close of year | 513,175 us-gaap_RealEstateAccumulatedDepreciation |  | 418,136 us-gaap_RealEstateAccumulatedDepreciation | 333,778 us-gaap_RealEstateAccumulatedDepreciation
Work in progress | 28,908 us-gaap_DevelopmentInProcess |  | 60,720 us-gaap_DevelopmentInProcess | 86,579 us-gaap_DevelopmentInProcess
Mortgages payable, including unamortized premium of $890 and $130, respectively | 26,339 us-gaap_SecuredDebt |  | 9,475 us-gaap_SecuredDebt |
Operating Lease |  |  |  |
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] |  |  |  |
Balance at the close of year | 5,200,477 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember | [1],[2] |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Balance at the close of year | 511,702 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |
Real estate, federal income tax basis | 5,119,673 us-gaap_RealEstateFederalIncomeTaxBasis / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |
Direct Financing Lease |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Real estate, federal income tax basis | 2,703 us-gaap_RealEstateFederalIncomeTaxBasis / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_DirectFinancingLeaseMember |  |  |
Mortgage Agreement-2 |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Mortgages payable, including unamortized premium of $890 and $130, respectively | 6,952 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgageAgreement2Member |  |  |
Mortgage Agreement-3 |  |  |  |
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] |  |  |  |
Mortgages payable, including unamortized premium of $890 and $130, respectively | $ 15 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgageAgreement3Member |  |  |
[1] | Transactions in real estate and accumulated depreciation during 2014, 2013, and 2012 are summarized as follows: 2014 2013 2012Land, buildings, and leasehold interests: Balance at the beginning of year$4,686,844 $4,145,368 $3,531,845Acquisitions, completed construction and tenant improvements601,168 602,836 701,054Disposition of land, buildings, and leasehold interests(50,938) (57,254) (77,219)Provision for loss on impairment of real estate(823) (4,106) (10,312)Balance at the close of year$5,236,251 $4,686,844 $4,145,368Accumulated depreciation and amortization: Balance at the beginning of year$418,136 $333,778 $270,621Disposition of land, buildings, and leasehold interests(9,153) (6,778) (6,980)Depreciation and amortization expense104,192 91,136 70,137Balance at the close of year$513,175 $418,136 $333,778
[2] | As of December 31, 2014, the leases are treated as either operating or financing leases for federal income tax purposes. As of December 31, 2014, the aggregate cost of the properties owned by NNN that are under operating leases were $5,119,673 and financing leases were $2,703.

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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