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Fair Value of Financial Instruments	12 Months Ended
Fair Value of Financial Instruments	Dec. 31, 2015
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 cash and cash equivalents, mortgages, notes and other receivables, mortgages payable and other liabilities at December 31, 2015 and 2014, approximate fair value based upon current market prices of similar issues. At December 31, 2015 and 2014, the carrying value and fair value of NNN’s notes payable, collectively, was $2,007,242,000 and $1,813,439,000, respectively, based upon quoted market prices, which are a Level 1 input.