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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, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net earnings attributable to NNN | $ 44,352 | $ 38,015 | $ 115,904 |  | $ 101,353 |
Less: Excess of redemption value over carrying value of Series C preferred shares redeemed | 0 | 0 | 0 |  | (3,098) |
Net earnings attributable to common stockholders | 34,810 | 33,253 | 96,839 |  | 85,588 |
Less: Earnings attributable to unvested restricted shares | (135) | (215) | (366) |  | (525) |
Net earnings used in basic earnings per share | 34,675 | 33,038 | 96,473 |  | 85,063 |
Reallocated undistributed loss | 0 | (1) | (3) |  | (4) |
Net earnings used in diluted earnings per share | 34,675 | 33,037 | 96,470 |  | 85,059 |
Weighted average number of shares outstanding (in shares) | 121,096,076 | 108,461,120 | 117,973,443 |  | 107,039,590 |
Less: Unvested restricted stock (in shares) | (469,370) | (696,270) | (441,588) |  | (652,890) |
Less: Contingent shares (in shares) | (338,816) | (276,915) | (309,692) |  | (246,698) |
Weighted average number of shares outstanding used in basic earnings per share (in shares) | 120,287,890 | 107,487,935 | 117,222,163 |  | 106,140,002 |
Contingent shares (in shares) | 0 | 0 | 0 |  | 8,459 |
Convertible notes payable (in shares) | 768,843 | 2,692,153 | 1,963,457 |  | 1,787,275 |
Common stock options (in shares) | 0 | 0 | 0 |  | 1,287 |
Directors' deferred fee plan (in shares) | 173,499 | 159,617 | 170,574 |  | 154,886 |
Weighted average number of shares outstanding used in diluted earnings per share | 121,230,232 | 110,339,705 | 119,356,194 |  | 108,091,909 |
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 | 0 | 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) | (4,762) | (14,285) | [2] | (10,688) | [2]
Series E 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 | $ (4,780) | $ 0 | $ (4,780) | [2],[3] | $ 0 | [2],[3]
[1] | The Series C preferred stock was redeemed in March 2012. The dividends paid during the nine months ended September 30, 2012 include accumulated and unpaid dividends through the redemption date.
[2] | The Series E preferred stock dividends paid during the quarter ended September 30, 2013 include accumulated and unpaid dividends from the issuance date through the declaration date.
[3] | The Series D and E preferred stock have no maturity date and will remain outstanding unless redeemed.

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