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Notes Payable - Convertible (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 2026 Notes [Member] | Dec. 31, 2011 2026 Notes [Member] | Dec. 31, 2009 2026 Notes [Member] | Dec. 31, 2008 2026 Notes [Member] | Sep. 30, 2012 2026 Notes [Member] | Dec. 31, 2012 2028 Notes [Member] | Dec. 31, 2011 2028 Notes [Member] | Dec. 31, 2009 2028 Notes [Member] | Dec. 31, 2012 Convertible Debt [Member] | Dec. 31, 2011 Convertible Debt [Member] | Dec. 31, 2010 Convertible Debt [Member] | Nov. 06, 2012 Convertible Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  |  | $ 168,650,000 | [1],[2],[3] |  |  |  |  |  | $ 228,576,000 | [1],[4],[5] |  |  |  |  |  |  |
Stated Interest Rate |  |  |  | 3.95% | [1],[2],[3] |  |  |  | (3.95%) | [1],[2],[3] | 5.125% | [1],[4],[5] |  |  |  |  |  |  |
Effective Interest Rate |  |  |  | 5.84% | [1],[2],[3],[6] |  |  |  |  |  | 7.192% | [1],[4],[5],[6] |  |  |  |  |  |  |
Debt Issuance Costs |  |  |  | 3,850,000 | [1],[2],[3],[7] |  |  |  |  |  | 5,459,000 | [1],[4],[5],[8] |  |  |  |  |  |  |
Original Principal |  |  |  | 172,500,000 | [1],[2],[3] |  |  |  |  |  | 234,035,000 | [1],[4],[5] |  |  |  |  |  |  |
Repurchases |  |  |  | (33,800,000) | [1],[2],[3] |  | (8,800,000) | (25,000,000) |  |  |  |  |  | (11,000,000) | [1],[4],[5] |  |  |  |
Debt converted |  |  |  | (123,163,000) | [1],[2],[3] |  |  |  |  |  | 0 | [1],[4],[5] |  |  |  |  |  |  |
Outstanding principal balance | 238,572,000 | 361,735,000 |  | 15,537,000 | [1],[2],[3],[9] |  |  |  |  |  | 223,035,000 | [1],[4],[5] |  |  |  |  |  |  | 38,100,000
Repayment of notes payable - convertible | 164,649,000 | 0 | 0 | (164,649,000) | [1],[2],[3] |  | 6,994,000 | 19,188,000 |  |  |  |  |  | 8,588,000 |  |  |  |  |
Gains on extinguishment of debt |  |  |  |  |  |  | 1,565,000 | 4,961,000 |  |  | 1,867,000 |  |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  | 463,000 |  |  |  |  |  |  | 219,000 |  |  |  |  |  |  |  |
Conversion price |  |  |  | $ 23.4611 |  |  |  |  |  |  | $ 25.3228 |  |  |  |  |  |  |  |
Conversion rate basis |  |  |  | 1 |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Convertible notes payable, shares issued upon conversion |  |  |  | 42.6237 |  |  |  |  |  |  | 39.4902 |  |  |  |  |  |  |  |
Effective interest rate |  |  |  | 5.84% |  |  |  |  |  |  | 7.192% |  |  |  |  |  |  |  |
Carrying value of equity component | (22,193,000) | (33,873,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining unamortized debt discount | (2,072,000) | (6,363,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value of convertible debt | 214,307,000 | 321,499,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining discount amortization period |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
Noncash interest charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,291,000 | 5,837,000 | 6,154,000 |
Contractual interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,744,000 | 16,909,000 | 17,046,000 |
Interest Expense, Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,035,000 | 22,746,000 | 23,200,000 |
If-converted value in excess of principal |  |  |  | 5,125,000 |  | 16,057,000 |  |  |  |  | 51,764,000 |  | 8,831,000 |  |  |  |  |  |
Equity component of convertible debt | $ 41,486,000 |  |  | $ 41,486,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Debt issuance costs include underwriting discounts and commissions, legal and accounting fees, rating agency fees and printing expenses. These costs have been deferred and are being amortized over the period to the earliest put option date of the holders using the effective interest method.
[2] | NNN repurchased $8,800 and $25,000 in 2009 and 2008, respectively, for a purchase price of $6,994 and $19,188, respectively, resulting in a gain of $1,565 and $4,961, respectively.
[3] | The conversion rate per $1 principal amount was 42.6237 shares of NNN’s common stock, which is equivalent to a conversion price of $23.4611 per share of common stock.
[4] | The conversion rate per $1 principal amount was 39.4902 shares of NNN’s common stock, which is equivalent to a conversion price of $25.3228 per share of common stock.
[5] | NNN repurchased $11,000 in 2009 for a purchase price of $8,588 resulting in a gain of $1,867.
[6] | With the adoption of the accounting guidance on convertible debt securities in 2009, the effective interest rates for the 2026 Notes and the 2028 Notes are 5.840% and 7.192%, respectively.
[7] | Includes $463 of note costs which were written off in connection with the repurchase of $33,800 of the 2026 Notes.
[8] | Includes $219 of note costs which were written off in connection with the repurchase of $11,000 of the 2028 Notes, respectively.
[9] | In January 2013, NNN converted the remaining principal balance.

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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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 Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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