Organization And Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Net earnings attributable to NNN	$ 45,571	$ 37,486	$ 88,904		$ 71,552
Net earnings available to NNN’s common stockholders	36,713	32,724	71,187		62,029
Less: Earnings attributable to unvested restricted shares	(198)	(130)	(361)		(231)
Net earnings used in basic and diluted earnings per share	36,515	32,594	70,826		61,798
Weighted average number of shares outstanding	123,495,650	118,620,837	122,957,186		116,386,249
Less: Unvested restricted stock	(489,095)	(469,370)	(446,439)		(427,465)
Less: Unvested contingent shares	(516,249)	(338,816)	(475,077)		(294,889)
Weighted average number of shares outstanding used in basic earnings per share	122,490,306	117,812,651	122,035,670		115,663,895
Convertible notes payable (in shares)	0	2,882,355	0		2,570,706
Other (in shares)	342,218	170,519	357,061		169,088
Weighted average number of shares outstanding used in diluted earnings per share	122,832,524	120,865,525	122,392,731		118,403,689
Series D Depositary Share
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Less: Series D and E preferred stock dividends	(4,762)	(4,762)	(9,523)	[1]	(9,523)	[1]
Series E Depositary Share
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Less: Series D and E preferred stock dividends	$ (4,096)	$ 0	$ (8,194)	[1]	$ 0	[1]

[1] The Series D and E preferred stock have no maturity date and will remain outstanding unless redeemed.