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Organization and Summary of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to NNN | $ 40,663,000 | $ 38,015,000 | $ 33,505,000 | $ 29,832,000 | $ 27,570,000 | $ 22,632,000 | $ 21,303,000 | $ 20,820,000 | $ 142,015,000 |  | $ 92,325,000 |  | $ 72,997,000 |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  |  |  | (6,785,000) |  | (6,785,000) |
Less: Excess of redemption value over carrying value of preferred shares redeemed |  |  |  |  |  |  |  |  | (3,098,000) |  | 0 |  | 0 |
Net earnings attributable to common stockholders |  |  |  |  |  |  |  |  | 121,489,000 |  | 85,540,000 |  | 66,212,000 |
Less: Earnings attributable to unvested restricted shares |  |  |  |  |  |  |  |  | (741,000) |  | (622,000) |  | (299,000) |
Net earnings used in basic earnings per share |  |  |  |  |  |  |  |  | 120,748,000 |  | 84,918,000 |  | 65,913,000 |
Reallocated undistributed income (loss) |  |  |  |  |  |  |  |  | (5,000) |  | (2,000) |  | 0 |
Net earnings used in diluted earnings per share |  |  |  |  |  |  |  |  | 120,743,000 |  | 84,916,000 |  | 65,913,000 |
Weighted average number of shares outstanding |  |  |  |  |  |  |  |  | 107,873,577 |  | 88,972,723 |  | 83,320,921 |
Less: Unvested restricted stock (in shares) |  |  |  |  |  |  |  |  | (654,127) |  | (630,102) |  | (605,276) |
Less: Contingent shares (in shares) |  |  |  |  |  |  |  |  | 254,294 |  | 242,545 |  | 0 |
Weighted average number of shares outstanding used in basic earnings per share |  |  |  |  |  |  |  |  | 106,965,156 |  | 88,100,076 |  | 82,715,645 |
Contingent shares (in shares) |  |  |  |  |  |  |  |  | 6,333 |  | 66,001 |  | 0 |
Convertible debt (in shares) |  |  |  |  |  |  |  |  | 1,987,842 |  | 512,024 |  | 0 |
Common stock options (in shares) |  |  |  |  |  |  |  |  | 992 |  | 2,881 |  | 3,814 |
Directors' deferred fee plan (in shares) |  |  |  |  |  |  |  |  | 157,192 |  | 156,075 |  | 129,903 |
Weighted average number of shares outstanding used in diluted earnings per share |  |  |  |  |  |  |  |  | 109,117,515 |  | 88,837,057 |  | 82,849,362 |
Series C Depositary Share [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | (1,979,000) | [1] | (6,785,000) | [1] | (6,785,000) | [1]
Series D Depositary Share [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | $ (15,449,000) | [2] | $ 0 | [2] | $ 0 | [2]
[1] | The Series C Preferred Stock was redeemed in March 2012. The dividends paid during the quarter ended March 31, 2012 include accumulated and unpaid dividends through the redemption date.
[2] | The Series D Preferred Stock dividends paid during the quarter ended June 30, 2012 include accumulated and unpaid dividends from the issuance date through the declaration date. The Series D Preferred Stock has no maturity date and will remain outstanding unless redeemed.

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