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Notes Payable - Convertible (Details) (USD $) | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Jan. 31, 2013 2026 Notes [Member] | Mar. 31, 2013 2026 Notes [Member] | Dec. 31, 2012 2026 Notes [Member] | Mar. 31, 2013 2028 Notes [Member] | Dec. 31, 2012 2028 Notes [Member] | Dec. 31, 2009 2028 Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] | Mar. 31, 2012 Convertible Debt [Member] | Dec. 31, 2012 Convertible Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Convertible Debt |  |  |  |  | $ 168,650,000 | [1],[2] |  | $ 228,576,000 | [1],[3],[4] |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.95% | [1],[2] |  | 5.125% | [1],[3],[4] |  |  |  |  |  |
Effective Interest Rate |  |  |  |  | 5.84% | [1],[2],[5] |  | 7.192% | [1],[3],[4],[5] |  |  |  |  |  |
Debt Issuance Costs |  |  |  |  | 3,850,000 | [1],[2] |  | 5,459,000 | [1],[3],[4],[6] |  |  |  |  |  |
Principal amount of debt |  |  |  |  | 172,500,000 | [1],[2] |  | 234,035,000 | [1],[3],[4] |  |  |  |  |  |
Repurchases |  |  |  |  | (33,800,000) | [1],[2] |  |  |  |  | (11,000,000) | [1],[3],[4] |  |  |
Settled |  |  |  | (15,537,000) | (138,700,000) | [1],[2] |  | 0 | [1],[3],[4] |  |  |  |  |  |
Outstanding principal balance | 223,035,000 |  | 238,572,000 |  | 0 | [1],[2],[7] | 15,537,000 | 223,035,000 | [1],[3],[4] |  |  |  |  |  |
Conversion rate basis |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |
Convertible notes payable, shares issued upon conversion |  |  |  |  |  |  | 42.6237 | 39.5149 |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  | $ 23.4611 | $ 25.3069 |  |  |  |  |  |  |
Repayments of convertible debt | 20,565,000 | 0 |  | 20,565,000 |  |  |  |  |  |  | 8,588,000 |  |  |  |
Gains (losses) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 1,867,000 |  |  |  |
Write off of deferred debt issuance cost |  |  |  |  |  |  |  |  |  |  | 219,000 |  |  |  |
Convertible, effective interest rate |  |  |  |  | 5.84% |  |  | 7.192% |  |  |  |  |  |  |
Carrying value of equity component | (20,720,000) |  | (22,193,000) |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable unamortized discount | (951,000) |  | (2,072,000) |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount of convertible debt | 201,364,000 |  | 214,307,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining discount amortization period |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Noncash interest charges | 1,356,000 | 1,181,000 |  |  |  |  |  |  |  |  |  |  | 1,122,000 | 1,044,000 |
Contractual interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,858,000 | 4,227,000 |
Amortization of debt costs |  |  |  |  |  |  |  |  |  |  |  |  | 305,000 |  | 0
Total interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,285,000 | 5,271,000 |
Convertible, If-converted value in rxcess of principal |  |  |  |  |  |  | 5,125,000 | 95,739,000 |  | 51,764,000 |  |  |  |  |
Decrease to additional paid-in capital |  |  |  | $ 5,028,000 |  |  |  |  |  |  |  |  |  |  |
[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] | 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.
[3] | The conversion rate per $1 principal amount was 39.5149 shares of NNN’s common stock, which is equivalent to a conversion price of $25.3069 per share of common stock.
[4] | NNN repurchased $11,000 in 2009 for a purchase price of $8,588 resulting in a gain of $1,867.
[5] | 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.
[6] | Includes $219 of note costs which were written off in connection with the repurchase of $11,000 of the 2028 Notes.
[7] | In January 2013, NNN settled the remaining principal balance of $15,537.

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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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