Earnings From Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Rental income from operating leases	$ 58,154	$ 52,106	$ 115,494	$ 104,025
Real estate expense reimbursement from tenants	2,197	1,591	4,532	3,349
Interest and other income from real estate transactions	543	973	1,181	1,922
Total revenues	62,516	56,412	124,469	112,906
Gross proceeds		(5,600)		(5,600)
Costs		(4,959)		(4,959)
Gain		641		641
General and administrative	6,568	5,775	13,226	11,372
Real estate	4,026	3,143	7,748	6,615
Depreciation and amortization	13,871	11,926	27,395	23,732
Total operating expenses	24,732	21,009	48,765	45,567
Interest and other income	283	637	625	905
Interest expense	(17,512)	(16,034)	(35,174)	(32,024)
Total other expenses (revenues)	(17,229)	(15,397)	(34,549)	(31,119)
Earnings (loss) before gain on disposition of real estate and income tax expense	21,245	21,078	41,843	37,159
Income tax expense	210	223	191	327
Earnings from discontinued operations including noncontrolling interests	130	687	258	902
Loss (earnings) attributable to noncontrolling interests	(34)	444		377
Real Estate - Investment Portfolio [Member]
Rental income from operating leases	30	302	56	487
Real estate expense reimbursement from tenants	4	19	8	34
Interest and other income from real estate transactions	5	5	5	33
Total revenues	39	326	69	554
General and administrative				14
Real estate	53	39	108	123
Depreciation and amortization	4	59	9	139
Total operating expenses	57	98	117	276
Earnings (loss) before gain on disposition of real estate and income tax expense	(18)	228	(48)	278
Gain on disposition of real estate	1	355	30	377
Income tax expense		(17)	(3)	(14)
Earnings (loss) from discontinued operations attributable to NNN	(17)	566	(21)	641
Real Estate - Inventory Portfolio [Member]
Rental income from operating leases	666	1,216	1,139	2,368
Real estate expense reimbursement from tenants	98	154	204	1,141
Interest and other income from real estate transactions	3	461	17	497
Total revenues	767	1,831	1,360	4,006
Gross proceeds		36,668	1,100	37,470
Costs		(36,455)	(998)	(37,170)
Gain		213	102	300
General and administrative	3	19	7	56
Real estate	184	380	338	1,421
Depreciation and amortization	23	55	44	116
Total operating expenses	210	454	389	1,593
Interest and other income		(2)		(2)
Interest expense	340	943	680	1,886
Total other expenses (revenues)	340	941	680	1,884
Earnings (loss) before gain on disposition of real estate and income tax expense	217	649	393	829
Income tax expense	(70)	(528)	(114)	(568)
Earnings from discontinued operations including noncontrolling interests	147	121	279	261
Loss (earnings) attributable to noncontrolling interests	(33)	45	(93)	(31)
Earnings (loss) from discontinued operations attributable to NNN	$ 114	$ 166	$ 186	$ 230