Performance Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2012

Performance Incentive Plan [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

The following summarizes NNN’s stock-option compensation activity for each of the years ended December 31:

	Number of Shares
	2012		2011		2010
Outstanding, January 1	5,000		7,500		12,154
Options granted	—		—		—
Options exercised	(5,000	)	(2,500	)	(4,654	)
Options surrendered	—		—		—
Outstanding, December 31	—		5,000		7,500
Exercisable, December 31	—		5,000		7,500

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following represents the weighted average option exercise price information for each of the years ended December 31:

	2012		2011		2010
Outstanding, January 1	$	14.57	$	14.11	$	13.72
Granted during the year	—		—		—
Exercised during the year	14.57		13.20		13.08
Outstanding, December 31	—		14.57		14.11
Exercisable, December 31	—		14.57		14.11

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

The following summarizes the restricted stock activity for the year ended December 31, 2012:

	Number of Shares		Weighted Average Share Price
Non-vested restricted shares, January 1	900,573		$	19.18
Restricted shares granted	398,578		26.87
Restricted shares vested	(309,874	)	22.08
Restricted shares forfeited	(19,500	)	23.62
Restricted shares repurchased	(5,165	)	22.40
Non-vested restricted shares, December 31	964,612		$	23.40

Schedule of Other Share-based Compensation, Activity

The following summarizes other grants made during the year ended December 31, 2012, pursuant to the 2007 Plan.

	Shares	Weighted Average   Share Price
Other share grants under the 2007 Plan:
Directors’ fees	16,078	$	28.78
Deferred Directors’ fees	18,622	28.80
	34,700	$	28.79
Shares available under the 2007 Plan for grant, end of period	4,281,900