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Organization and Summary of Significant Accounting Policies (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to NNN |  | $ 36,562 | $ 82,032 | $ 70,573 | $ 103,280 | $ 72,168 | $ 61,120 | $ 58,028 | $ 73,657 | $ 292,447 | $ 264,973 | $ 239,500
Net earnings available to common stockholders |  |  |  |  |  |  |  |  |  | 258,120 | 217,193 | 200,877
Less: Earnings attributable to unvested restricted shares |  |  |  |  |  |  |  |  |  | (548) | (531) | (695)
Net earnings used in basic and diluted earnings per share |  |  |  |  |  |  |  |  |  | $ 257,572 | $ 216,662 | $ 200,182
Basic and Diluted Weighted Average Shares Outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 156,490,901 | 149,840,116 | 145,014,422
Less: Unvested restricted shares (in shares) |  |  |  |  |  |  |  |  |  | (280,633) | (285,585) | (390,522)
Less: Unvested contingent restricted shares (in shares) |  |  |  |  |  |  |  |  |  | (465,667) | (443,343) | (447,676)
Weighted average number of shares outstanding used in basic earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 155,744,601 | 149,111,188 | 144,176,224
Effects of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Other (shares) |  |  |  |  |  |  |  |  |  | 551,018 | 321,453 | 484,409
Weighted average number of shares outstanding used in diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 156,295,619 | 149,432,641 | 144,660,633
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |
Less: preferred stock dividends |  |  |  |  |  |  |  |  |  | $ 0 | $ (3,598) | $ (19,047)
Less: Excess of redemption value over carrying value of Series D preferred shares redeemed | $ (9,855) |  |  |  |  |  |  |  |  | 0 | (9,855) | 0
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |
Less: preferred stock dividends |  |  |  |  |  |  |  |  |  | (16,387) | (16,387) | (16,387)
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |  |
Less: preferred stock dividends |  |  |  |  |  |  |  |  |  | $ (17,940) | $ (17,940) | $ (3,189)

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