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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to NNN | $ 42,471 | $ 55,198 | $ 46,188 | $ 53,978 | $ 53,757 | $ 47,940 | $ 45,571 | $ 43,333 | $ 197,836 | $ 190,601 | $ 160,145
Net earnings attributable to common stockholders |  |  |  |  |  |  |  |  | 162,402 | 155,167 | 132,222
Less: Earnings attributable to unvested restricted shares |  |  |  |  |  |  |  |  | (706) | (773) | (718)
Net earnings used in basic and diluted earnings per share |  |  |  |  |  |  |  |  | $ 161,696 | $ 154,394 | $ 131,504
Basic and Diluted Weighted Average Shares Outstanding: |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding (in shares) |  |  |  |  |  |  |  |  | 134,868,640 | 125,221,358 | 118,969,771
Less: Unvested restricted shares (in shares) |  |  |  |  |  |  |  |  | (412,505) | (467,968) | (448,590)
Less: Unvested contingent shares (in shares) |  |  |  |  |  |  |  |  | (457,461) | (495,832) | (317,033)
Weighted average number of shares outstanding used in basic earnings per share (in shares) |  |  |  |  |  |  |  |  | 133,998,674 | 124,257,558 | 118,204,148
Convertible debt (shares) |  |  |  |  |  |  |  |  | 0 | 0 | 1,468,559
Other (shares) |  |  |  |  |  |  |  |  | 490,742 | 452,668 | 192,117
Weighted average number of shares outstanding used in diluted earnings per share (shares) |  |  |  |  |  |  |  |  | 134,489,416 | 124,710,226 | 119,864,824
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  | $ (19,047) | $ (19,047) | $ (19,047)
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  | $ (16,387) | $ (16,387) | $ (8,876)

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