Organization And Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Net earnings attributable to NNN	$ 22,632	$ 21,210	$ 64,755		$ 58,782
Less: Series C preferred stock dividends	(1,696)	(1,696)	(5,089)	[1]	(5,089)	[1]
Net earnings attributable to common stockholders	20,936	19,514	59,666		53,693
Less: Earnings attributable to unvested restricted shares	(160)	(93)	(442)		(238)
Net earnings used in basic earnings per share	20,776	19,421	59,224		53,455
Reallocated undistributed income	(1)		(2)
Net earnings used in diluted earnings per share	20,775	19,421	59,222		53,455
Weighted average number of shares outstanding	88,008,849	83,429,299	85,772,590		83,244,062
Less: contingent shares	(251,826)		(251,826)
Less: unvested restricted stock	(647,617)	(649,823)	(623,818)		(605,276)
Weighted average number of shares outstanding used in basic earnings per share	87,109,406	82,779,476	84,896,946		82,638,786
Common stock options	2,669	3,054	3,093		3,825
Convertible debt	516,775		385,942
Directors' deferred fee plan	159,400	132,846	152,889		126,945
Weighted average number of shares outstanding used in diluted earnings per share	87,788,250	82,915,376	85,438,870		82,769,556
NNN [Member]
Net earnings attributable to NNN	$ 22,632	$ 21,210	$ 64,755		$ 58,782

[1] The Series C preferred stock has no maturity date and will remain outstanding unless redeemed.