Earnings from Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned income from direct financing leases	$ 427	$ 489	$ 1,306	$ 1,495
Real estate expense reimbursement from tenants	3,323	3,162	9,783	9,343
Interest and other income from real estate transactions	452	342	1,786	1,098
Revenues	109,856	100,775	319,532	289,534
General and administrative	9,007	7,536	25,995	25,213
Real estate	4,583	4,543	13,669	12,870
Depreciation and amortization	29,768	25,831	85,787	72,092
Total operating expenses	43,456	38,361	126,269	113,741
Interest expense	21,641	20,125	63,681	65,613
Total other expenses (revenues)	21,554	19,403	63,436	64,180
Earnings from continuing operations before income tax benefit (expense)	44,846	43,011	129,827	111,613
Income tax expense	(372)	(219)	(721)	152
Earnings from discontinued operations attributable to NNN including noncontrolling interests	142	1,550	124	4,086
Earnings attributable to noncontrolling interests	0	0	0	(163)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental income from operating leases	0	642	0	1,573
Earned income from direct financing leases	0	57	0	173
Real estate expense reimbursement from tenants	6	14	17	91
Interest and other income from real estate transactions	0	0	22	33
Revenues	6	713	39	1,870
General and administrative	0	1	0	214
Real estate	4	95	4	188
Depreciation and amortization	3	174	3	331
Impairment charges	0	(436)	63	468
Total operating expenses	7	(166)	70	1,201
Interest expense	0	0	0	41
Total other expenses (revenues)	0	0	0	41
Earnings from continuing operations before income tax benefit (expense)	(1)	879	(31)	628
Gain on disposition of real estate	143	1,228	155	4,402
Income tax expense	0	(557)	0	(944)
Earnings from discontinued operations attributable to NNN including noncontrolling interests	142	1,550	124	4,086
Earnings attributable to noncontrolling interests	0	0	0	(163)
Earnings from discontinued operations attributable to NNN	$ 142	$ 1,550	$ 124	$ 3,923