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Organization and Summary of Significant Accounting Policies (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to NNN |  | $ 66,092 | $ 50,784 | $ 51,942 | $ 70,683 | $ 42,471 | $ 55,198 | $ 46,188 | $ 53,978 | $ 239,500 |  | $ 197,836 | $ 190,601
Net earnings attributable to common stockholders |  |  |  |  |  |  |  |  |  | 200,877 |  | 162,402 | 155,167
Less: Earnings attributable to unvested restricted shares |  |  |  |  |  |  |  |  |  | (695) |  | (706) | (773)
Net earnings used in basic and diluted earnings per share |  |  |  |  |  |  |  |  |  | $ 200,182 |  | $ 161,696 | $ 154,394
Basic and Diluted Weighted Average Shares Outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 145,014,422 |  | 134,868,640 | 125,221,358
Less: Unvested restricted shares (in shares) |  |  |  |  |  |  |  |  |  | (390,522) |  | (412,505) | (467,968)
Less: Unvested contingent restricted shares (in shares) |  |  |  |  |  |  |  |  |  | (447,676) |  | (457,461) | (495,832)
Weighted average number of shares outstanding used in basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 144,176,224 |  | 133,998,674 | 124,257,558
Effects of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Other (shares) |  |  |  |  |  |  |  |  |  | 484,409 |  | 490,742 | 452,668
Weighted average number of shares outstanding used in diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 144,660,633 |  | 134,489,416 | 124,710,226
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends | [1] |  |  |  |  |  |  |  |  | $ (19,047) |  | $ (19,047) | $ (19,047)
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends | [2] |  |  |  |  |  |  |  |  | (16,387) |  | (16,387) | (16,387)
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  | $ (3,189) | [3] | $ 0 | $ 0
[1] | In January 2017, NNN called for redemption of all outstanding shares of its Series D Preferred Stock represented by depositary shares, each representing a 1/100th interest in a Series D Preferred Stock share. The depositary shares will be redeemed on February 23, 2017.
[2] | The Series E Preferred Stock has no maturity date and will remain outstanding unless redeemed by NNN. The earliest redemption date for the Series E Preferred Stock is May 2018.
[3] | The Series F Preferred Stock was issued October 11, 2016 and has no maturity date and will remain outstanding unless redeemed by NNN. The earliest redemption date for the Series F preferred stock is October 2021.

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