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Notes Payable - Convertible (Tables)
12 Months Ended
Dec. 31, 2015
Convertible Notes Payable [Abstract]  
Debt Interest Expense
NNN recorded the following in interest expense relating to the 2028 Notes and the 2026 Notes for the year ended December 31 (dollars in thousands):
 
 
2013
Noncash interest charges
 
$
2,072

Contractual interest expense
 
5,400

Amortization of debt costs
 
566

 
 
$
8,038