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Notes Payable - Convertible (Tables) | 9 Months Ended
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Sep. 30, 2013
Convertible Notes Payable [Abstract] |
Schedule of Debt Instrument Interest Expense | NNN recorded the following in interest expense relating to the 3.950% convertible senior notes due 2026 (the "2026 Notes") and the 5.125% convertible senior notes due 2028 (the "2028 Notes") (dollars in thousands):
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Contractual interest expense | $ | 26 |  |  | $ | 4,227 |  |  | $ | 5,400 |  |  | $ | 12,682 |
Noncash interest charges | — |  |  | 1,082 |  |  | 2,072 |  |  | 3,189 |
Amortization of debt costs | — |  |  | 291 |  |  | 566 |  |  | 851 |
Total interest expense | $ | 26 |  |  | $ | 5,600 |  |  | $ | 8,038 |  |  | $ | 16,722 |

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- Definition Schedule of Debt Instrument Interest Expense [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration