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Mortgages Payable (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal Balance | $ 10,602,000 |  | $ 23,171,000 |
Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Value of Encumbered Assets | 23,830,000 | [1] |  |
Outstanding Principal Balance | 10,602,000 | [1] | 23,171,000 | [1]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
2013 | 1,127,000 |  |  |
2014 | 1,158,000 |  |  |
2015 | 1,207,000 |  |  |
2016 | 6,842,000 |  |  |
2017 | 146,000 |  |  |
Thereafter | 122,000 |  |  |
December 2001 - $623 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 623,000 | [2] |  |
Interest Rate | 9.00% | [2] |  |
Carrying Value of Encumbered Assets | 543,000 | [1],[2] |  |
Outstanding Principal Balance | 95,000 | [2] | 158,000 | [2]
December 2001 - $698 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 698,000 | [2] |  |
Interest Rate | 9.00% | [2] |  |
Carrying Value of Encumbered Assets | 1,047,000 | [1],[2] |  |
Outstanding Principal Balance | 299,000 | [2] | 333,000 | [2]
December 2001 - $485 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 485,000 | [2] |  |
Interest Rate | 9.00% | [2] |  |
Carrying Value of Encumbered Assets | 1,013,000 | [1],[2] |  |
Outstanding Principal Balance | 155,000 | [2] | 172,000 | [2]
June 2002 - $21,000 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 21,000,000 |  |  |
Interest Rate | 6.90% |  |  |
Carrying Value of Encumbered Assets | 0 | [1] |  |
Outstanding Principal Balance | 0 |  | 18,488,000 |
February 2004 - $6,952 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 6,952,000 | [2] |  |
Interest Rate | 6.90% | [2] |  |
Carrying Value of Encumbered Assets | 11,039,000 | [1],[2] |  |
Outstanding Principal Balance | 2,892,000 | [2] | 3,485,000 | [2]
March 2005 - $1,015 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 1,015,000 | [2] |  |
Interest Rate | 8.14% | [2] |  |
Carrying Value of Encumbered Assets | 1,283,000 | [1],[2] |  |
Outstanding Principal Balance | 439,000 | [2] | 535,000 | [2]
Mortgage Payable, Issued June 2012 [Member] | Mortgages [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 6,850,000 | [2],[3] |  |
Interest Rate | 5.75% | [2],[3] |  |
Carrying Value of Encumbered Assets | 8,905,000 | [1],[2],[3] |  |
Outstanding Principal Balance | $ 6,722,000 | [2],[3] | $ 0 | [2],[3]
[1] | Each loan is secured by a first mortgage lien on certain of NNN’s properties. The carrying values of the assets are as of December 31, 2012.
[2] | Date entered represents the date that NNN acquired real estate subject to a mortgage securing a loan. The corresponding original principal balance represents the outstanding principal balance at the time of acquisition.
[3] | Initial balance and outstanding principal balance includes unamortized premium.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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