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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2018
EARNINGS PER SHARE [Abstract] |
Basic and Diluted Earnings per Share | The following table presents the components of basic and diluted earnings per share for the three months and nine months ended September 30, 2018 and 2017 (in thousands, except per share amounts):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Net earnings attributable to Kirby |  | $ | 41,816 |  |  | $ | 28,607 |  |  | $ | 102,889 |  |  | $ | 81,868 |
Undistributed earnings allocated to restricted shares |  |  | (166 | ) |  |  | (213 | ) |  |  | (438 | ) |  |  | (599 | )
Income available to Kirby common stockholders - basic |  |  | 41,650 |  |  |  | 28,394 |  |  |  | 102,451 |  |  |  | 81,269 |
Undistributed earnings allocated to restricted shares |  |  | 166 |  |  |  | 213 |  |  |  | 438 |  |  |  | 599 |
Undistributed earnings reallocated to restricted shares |  |  | (165 | ) |  |  | (213 | ) |  |  | (437 | ) |  |  | (599 | )
Income available to Kirby common stockholders - diluted |  | $ | 41,651 |  |  | $ | 28,394 |  |  | $ | 102,452 |  |  | $ | 81,269 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,875 |  |  |  | 55,177 |  |  |  | 59,782 |  |  |  | 54,364 |
Weighted average unvested restricted stock |  |  | (237 | ) |  |  | (412 | ) |  |  | (255 | ) |  |  | (398 | )
Weighted average common stock outstanding - basic |  |  | 59,638 |  |  |  | 54,765 |  |  |  | 59,527 |  |  |  | 53,966 |
Dilutive effect of stock options and restricted stock units |  |  | 146 |  |  |  | 38 |  |  |  | 141 |  |  |  | 55 |
Weighted average common stock outstanding - diluted |  |  | 59,784 |  |  |  | 54,803 |  |  |  | 59,668 |  |  |  | 54,021 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.70 |  |  | $ | 0.52 |  |  | $ | 1.72 |  |  | $ | 1.51 |
Diluted |  | $ | 0.70 |  |  | $ | 0.52 |  |  | $ | 1.72 |  |  | $ | 1.50 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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