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Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Jun. 30, 2017
Financial Instruments, Owned, at Fair Value [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments: NNN believes the carrying value of its Credit Facility approximates fair value based upon its nature, terms and variable interest rate. NNN believes that the carrying value of its mortgages and notes receivable and mortgages payable at June 30, 2017 and December 31, 2016, approximate fair value based upon current market prices of comparable instruments (Level 3). At June 30, 2017 and December 31, 2016, the fair value of NNN’s notes payable net of unamortized discount and excluding debt costs was $2,377,525,000 and $2,367,102,000, respectively, based upon quoted market prices, which is a Level 1 valuation since NNN's notes payable is publicly traded.