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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 | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net earnings attributable to NNN | $ 38,015 | $ 22,632 | $ 101,353 |  | $ 64,755 |
Less: Excess of redemption value over carrying value of preferred shares redeemed | 0 | 0 | (3,098) |  | 0 |
Net earnings attributable to common stockholders | 33,253 | 20,936 | 85,588 |  | 59,666 |
Less: Earnings attributable to unvested restricted shares | (215) | (160) | (525) |  | (442) |
Net earnings used in basic earnings per share | 33,038 | 20,776 | 85,063 |  | 59,224 |
Reallocated undistributed loss | (1) | (1) | (4) |  | (2) |
Net earnings used in diluted earnings per share | 33,037 | 20,775 | 85,059 |  | 59,222 |
Weighted average number of shares outstanding (in shares) | 108,461,120 | 88,008,849 | 107,039,590 |  | 85,772,590 |
Less: Unvested restricted stock (in shares) | (696,270) | (647,617) | (652,890) |  | (623,818) |
Less: Contingent shares (in shares) | (276,915) | (251,826) | (246,698) |  | (251,826) |
Weighted average number of shares outstanding used in basic earnings per share (in shares) | 107,487,935 | 87,109,406 | 106,140,002 |  | 84,896,946 |
Contingent shares (in shares) | 0 | 0 | 8,459 |  | 0 |
Convertible notes payable (in shares) | 2,692,153 | 516,775 | 1,787,275 |  | 385,942 |
Common stock options (in shares) | 0 | 2,669 | 1,287 |  | 3,093 |
Directors' deferred fee plan (in shares) | 159,617 | 159,400 | 154,886 |  | 152,889 |
Weighted average number of shares outstanding used in diluted earnings per share (in shares) | 110,339,705 | 87,788,250 | 108,091,909 |  | 85,438,870 |
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 | (1,696) | (1,979) | [1] | (5,089) | [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) | $ 0 | $ (10,688) | [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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