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Organization And Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net earnings attributable to NNN | $ 34,066 |  | $ 29,832 |
Less: Excess of redemption value over carrying value of preferred shares redeemed | 0 |  | (3,098) |
Net earnings attributable to common stockholders | 29,304 |  | 24,755 |
Less: Earnings attributable to unvested restricted shares | (102) |  | (566) |
Net earnings used in basic earnings per share | 29,202 |  | 24,189 |
Reallocated undistributed loss | 0 |  | 0 |
Net earnings used in diluted earnings per share | 29,202 |  | 24,189 |
Weighted average number of shares outstanding (in shares) | 114,126,832 |  | 105,635,630 |
Less: Unvested restricted stock (in shares) | (385,258) |  | (568,163) |
Less: Contingent shares (in shares) | (250,473) |  | (226,600) |
Weighted average number of shares outstanding used in basic earnings per share (in shares) | 113,491,101 |  | 104,840,867 |
Contingent shares (in shares) | 0 |  | 25,471 |
Convertible notes payable (in shares) | 2,191,512 |  | 1,192,706 |
Common stock options (in shares) | 0 |  | 2,286 |
Directors' deferred fee plan (in shares) | 167,640 |  | 150,036 |
Weighted average number of shares outstanding used in diluted earnings per share (in shares) | 115,850,253 |  | 106,211,366 |
Series C Depositary Share [Member] |  |  |  |
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Less: Series C preferred stock dividends and Series D preferred stock dividends | 0 | [1] | (1,979) | [1]
Series D Depositary Share [Member] |  |  |  |
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Less: Series C preferred stock dividends and Series D preferred stock dividends | $ (4,762) | [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 has no maturity date and will remain outstanding unless redeemed.

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