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Notes Payable - Convertible (Tables) | 6 Months Ended
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Jun. 30, 2014
Convertible Notes Payable [Abstract] |
Schedule of Debt Instrument Interest Expense | NNN recorded the following interest expense related to the 5.125% convertible senior notes due 2028 (the "2028 Notes") during 2013. No interest expense was recorded during the quarter and six months ended June 30, 2014 (dollars in thousands):
| Quarter Ended June 30, 2013 |  | Six Months Ended June 30, 2013
Contractual interest expense | $ | 2,516 |  |  | $ | 5,374 |
Noncash interest charges | 950 |  |  | 2,072 |
Amortization of debt costs | 260 |  |  | 566 |
Total interest expense | $ | 3,726 |  |  | $ | 8,012 |

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