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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned income from direct financing leases	$ 556	$ 594	$ 1,122	$ 1,198
Real estate expense reimbursement from tenants	3,149	2,556	6,126	5,366
Interest and other income from real estate transactions	371	594	754	1,300
Total revenues	96,121	81,206	188,599	158,439
General and administrative	9,412	7,025	17,676	14,630
Real estate	4,301	4,040	8,218	8,549
Depreciation and amortization	22,552	18,678	46,270	36,388
Impairment losses and other charges, net of recoveries	1,153	345	4,004	380
Total operating expenses	36,425	32,291	74,136	62,150
Interest expense	23,394	19,569	45,221	39,387
Total other expenses (revenues)	23,017	19,208	44,510	38,667
Earnings from continuing operations before income tax expense and equity in earnings of unconsolidated affiliate	36,679	30,011	69,953	58,088
Gain on disposition of real estate	2,669	2,438	3,174	2,752
Income tax expense	(432)	(156)	2	(271)
Earnings from discontinued operations attributable to NNN including noncontrolling interests	1,359	3,466	1,554	5,177
Earnings attributable to noncontrolling interests	(160)	(3)	(216)	(8)
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental income from operating leases	523	2,089	1,149	4,293
Earned income from direct financing leases	0	24	0	54
Real estate expense reimbursement from tenants	60	55	132	199
Interest and other income from real estate transactions	31	4	36	6
Total revenues	614	2,172	1,317	4,552
General and administrative	212	3	214	5
Real estate	135	178	202	527
Depreciation and amortization	61	389	148	847
Impairment losses and other charges, net of recoveries	1,008	345	2,047	317
Total operating expenses	1,416	915	2,611	1,696
Interest expense	145	185	308	369
Total other expenses (revenues)	145	185	308	369
Earnings from continuing operations before income tax expense and equity in earnings of unconsolidated affiliate	(947)	1,072	(1,602)	2,487
Gain on disposition of real estate	2,669	2,438	3,174	2,752
Income tax expense	(363)	(44)	(18)	(62)
Earnings attributable to noncontrolling interests	(160)	(3)	(216)	(8)
Earnings from discontinued operations attributable to NNN	$ 1,199	$ 3,463	$ 1,338	$ 5,169