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Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details)
ft² in Thousands
9 Months Ended
Sep. 30, 2016
ft²
state
property
Property Portfolio:  
Total properties | property 2,485
Gross leasable area (square feet) | ft² 26,640
States | state 48
Weighted average remaining lease term (years) 11 years 6 months