Preferred Stock	12 Months Ended
Dec. 31, 2011
Preferred Stock [Abstract]
Preferred Stock [Text Block]	Preferred Stock: 7.375% Series C Cumulative Redeemable Preferred Stock. In October 2006, NNN filed a prospectus supplement to the prospectus contained in its February 2006 shelf registration statement and issued 3,680,000 depositary shares, each representing 1/100th of a share of 7.375% Series C Cumulative Redeemable Preferred Stock (“Series C Preferred Stock”), and received gross proceeds of $92,000,000. In connection with this offering, NNN incurred stock issuance costs of approximately $3,098,000, consisting primarily of underwriting commissions and fees, legal and accounting fees and printing expenses. Holders of the depositary shares are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends at the rate of 7.375% of the $25.00 liquidation preference per depositary share per annum (equivalent to a fixed annual amount of $1.84375 per depositary share). The Series C Preferred Stock underlying the depositary shares ranks senior to NNN’s common stock with respect to dividend rights and rights upon liquidation, dissolution or winding up of NNN. The Series C Preferred Stock has no maturity date and will remain outstanding unless redeemed. NNN may redeem the Series C Preferred Stock underlying the depositary shares on or after October 12, 2011, for cash, at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated, accrued and unpaid dividends. As of January 31, 2012, none of the Series C Preferred Stock had been redeemed.

Preferred Stock:

7.375% Series C Cumulative Redeemable Preferred Stock. In October 2006, NNN filed a prospectus supplement to the prospectus contained in its February 2006 shelf registration statement and issued 3,680,000 depositary shares, each representing 1/100th of a share of 7.375% Series C Cumulative Redeemable Preferred Stock (“Series C Preferred Stock”), and received gross proceeds of $92,000,000. In connection with this offering, NNN incurred stock issuance costs of approximately $3,098,000, consisting primarily of underwriting commissions and fees, legal and accounting fees and printing expenses.

Holders of the depositary shares are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends at the rate of 7.375% of the $25.00 liquidation preference per depositary share per annum (equivalent to a fixed annual amount of $1.84375 per depositary share). The Series C Preferred Stock underlying the depositary shares ranks senior to NNN’s common stock with respect to dividend rights and rights upon liquidation, dissolution or winding up of NNN. The Series C Preferred Stock has no maturity date and will remain outstanding unless redeemed. NNN may redeem the Series C Preferred Stock underlying the depositary shares on or after October 12, 2011, for cash, at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated, accrued and unpaid dividends. As of January 31, 2012, none of the Series C Preferred Stock had been redeemed.