Earnings from Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned income from direct financing leases	$ 435	$ 499	$ 879	$ 1,006
Real estate expense reimbursement from tenants	3,228	3,184	6,460	6,181
Interest and other income from real estate transactions	543	371	1,334	756
Revenues	105,613	96,295	209,677	188,759
General and administrative	8,074	9,412	16,989	17,677
Real estate	4,746	4,363	9,086	8,327
Depreciation and amortization	28,007	22,545	56,019	46,261
Total operating expenses	40,993	36,583	82,814	75,380
Interest expense	21,761	23,529	42,040	45,488
Total other expenses (revenues)	21,667	23,152	41,882	44,777
Earnings from continuing operations before income tax benefit (expense)	42,953	36,560	84,981	68,602
Income tax expense	(441)	(460)	(349)	370
Earnings (loss) from discontinued operations attributable to NNN including noncontrolling interests	18	1,506	(18)	2,537
Earnings attributable to noncontrolling interests	0	(158)	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	327	0	930
Earned income from direct financing leases	0	58	0	116
Real estate expense reimbursement from tenants	6	25	11	77
Interest and other income from real estate transactions	22	30	22	34
Revenues	28	440	33	1,157
General and administrative	0	212	0	213
Real estate	13	73	0	93
Depreciation and amortization	0	68	0	157
Impairment charges	0	904	63	904
Total operating expenses	13	1,257	63	1,367
Interest expense	0	11	0	41
Total other expenses (revenues)	0	11	0	41
Earnings from continuing operations before income tax benefit (expense)	15	(828)	(30)	(251)
Gain on disposition of real estate	3	2,669	12	3,174
Income tax expense	0	(335)	0	(386)
Earnings (loss) from discontinued operations attributable to NNN including noncontrolling interests	18	1,506	(18)	2,537
Earnings attributable to noncontrolling interests	0	(158)	0	(163)
Earnings (loss) from discontinued operations attributable to NNN	$ 18	$ 1,348	$ (18)	$ 2,374