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Notes Payable - Convertible (Tables)
 9 Months Ended
Sep. 30, 2013
Convertible Notes Payable [Abstract]  
Schedule of Debt Instrument Interest Expense
NNN recorded the following in interest expense relating to the 3.950% convertible senior notes due 2026 (the "2026 Notes") and the 5.125% convertible senior notes due 2028 (the "2028 Notes") (dollars in thousands):
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Contractual interest expense
$
26

 
$
4,227

 
$
5,400

 
$
12,682

Noncash interest charges
—

 
1,082

 
2,072

 
3,189

Amortization of debt costs
—

 
291

 
566

 
851

Total interest expense
$
26

 
$
5,600

 
$
8,038

 
$
16,722