Earnings from Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earned income from direct financing leases	$ 443	$ 508
Real estate expense reimbursement from tenants	3,232	2,998
Interest and other income from real estate transactions	792	384
Revenues	104,064	92,464
General and administrative	8,915	8,264
Real estate	4,340	3,964
Depreciation and amortization	28,012	23,716
Total operating expenses	41,821	38,795
Interest expense	20,278	21,960
Total other expenses (revenues)	20,215	21,626
Earnings from continuing operations before income tax benefit	42,028	32,043
Gain on disposition of real estate	1,954	0
Income tax expense	93	830
Earnings (loss) from discontinued operations attributable to NNN including noncontrolling interests	(36)	1,030
Earnings attributable to noncontrolling interests	0	(4)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental income from operating leases	0	604
Earned income from direct financing leases	0	58
Real estate expense reimbursement from tenants	5	51
Interest and other income from real estate transactions	0	4
Revenues	5	717
General and administrative	0	2
Real estate	(13)	20
Depreciation and amortization	0	89
Impairment charges	63	0
Total operating expenses	50	111
Interest expense	0	31
Total other expenses (revenues)	0	31
Earnings from continuing operations before income tax benefit	(45)	575
Gain on disposition of real estate	9	505
Income tax expense	0	(50)
Earnings attributable to noncontrolling interests	0	(4)
Earnings (loss) from discontinued operations attributable to NNN	$ (36)	$ 1,026