Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Accounted for using the operating method, net of accumulated depreciation and amortization	$ 2,603,827,000	$ 2,519,950,000
Accounted for using the direct financing method	28,475,000	29,773,000
Real estate, Inventory Portfolio, held for sale	31,350,000	32,076,000
Investment in unconsolidated affiliate	4,423,000	4,515,000
Mortgages, notes and accrued interest receivable, net of allowance	32,402,000	30,331,000
Commercial mortgage residual interests	16,245,000	15,915,000
Cash and cash equivalents	3,588,000	2,048,000
Receivables, net of allowance of $1,934 and $1,750, respectively	2,424,000	3,403,000
Accrued rental income, net of allowance of $4,364 and $3,609, respectively	25,386,000	25,535,000
Debt costs, net of accumulated amortization of $13,674 and $11,198, respectively	9,669,000	9,366,000
Other assets	41,018,000	40,663,000
Total assets	2,798,807,000	2,713,575,000
LIABILITIES AND EQUITY
Line of credit payable	219,200,000	161,000,000
Mortgages payable	23,728,000	24,269,000
Notes payable - convertible, net of unamortized discount of $8,967 and $12,201, respectively	352,768,000	349,534,000
Notes payable, net of unamortized discount of $1,017 and $1,118, respectively	598,983,000	598,882,000
Accrued interest payable	7,285,000	7,342,000
Other liabilities	40,395,000	43,774,000
Total liabilities	1,242,359,000	1,184,801,000
Stockholders' equity:
Preferred stock, $0.01 par value. Authorized 15,000,000 shares Series C, 3,680,000 depositary shares issued and outstanding, at stated liquidation value of $25 per share	92,000,000	92,000,000
Common stock, $0.01 par value. Authorized 190,000,000 shares; 86,034,430 and 83,613,289 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	862,000	838,000
Excess stock, $0.01 par value. Authorized 205,000,000 shares; none issued or outstanding
Capital in excess of par value	1,487,290,000	1,429,750,000
Retained earnings (accumulated dividends in excess of earnings)	(21,922,000)	3,234,000
Accumulated other comprehensive income (loss)	(3,069,000)	1,661,000
Total stockholders' equity of NNN	1,555,161,000	1,527,483,000
Noncontrolling interests	1,287,000	1,291,000
Total equity	1,556,448,000	1,528,774,000
Total liabilities and equity	$ 2,798,807,000	$ 2,713,575,000