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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Net earnings attributable to NNN	$ 47,940	$ 44,352	$ 136,844		$ 115,904
Net earnings available to NNN’s common stockholders	39,081	34,810	110,268		96,839
Less: Earnings attributable to unvested restricted shares	(205)	(135)	(567)		(366)
Net earnings used in basic and diluted earnings per share	38,876	34,675	109,701		96,473
Weighted average number of shares outstanding	125,559,410	121,096,076	123,834,126		117,973,443
Less: Unvested restricted stock	(489,095)	(469,370)	(460,814)		(441,588)
Less: Unvested contingent shares	(516,249)	(338,816)	(488,952)		(309,692)
Weighted average number of shares outstanding used in basic earnings per share	124,554,066	120,287,890	122,884,360		117,222,163
Convertible notes payable (in shares)	0	768,843	0		1,963,457
Other (in shares)	491,031	173,499	481,704		170,574
Weighted average number of shares outstanding used in diluted earnings per share	125,045,097	121,230,232	123,366,064		119,356,194
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)	(14,285)	[1]	(14,285)	[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	$ (4,097)	$ (4,780)	$ (12,291)	[1]	$ (4,780)	[1]

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