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EARNINGS PER SHARE (Tables) | 3 Months Ended
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Mar. 31, 2018
EARNINGS PER SHARE [Abstract] |
Components of Basic and Diluted Earnings per Share | The following table presents the components of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017 (in thousands, except per share amounts):
|  | Three months ended March 31, |
|  | 2018 |  |  | 2017 |
Net earnings attributable to Kirby |  | $ | 32,471 |  |  | $ | 27,483 |
Undistributed earnings allocated to restricted shares |  |  | (156 | ) |  |  | (190 | )
Income available to Kirby common stockholders – basic |  |  | 32,315 |  |  |  | 27,293 |
Undistributed earnings allocated to restricted shares |  |  | 156 |  |  |  | 190 |
Undistributed earnings reallocated to restricted shares |  |  | (156 | ) |  |  | (189 | )
Income available to Kirby common stockholders – diluted |  | $ | 32,315 |  |  | $ | 27,294 |
Shares outstanding: |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,678 |  |  |  | 53,914 |
Weighted average unvested restricted stock |  |  | (286 | ) |  |  | (372 | )
Weighted average common stock outstanding – basic |  |  | 59,392 |  |  |  | 53,542 |
Dilutive effect of stock options and restricted stock units |  |  | 101 |  |  |  | 67 |
Weighted average common stock outstanding – diluted |  |  | 59,493 |  |  |  | 53,609 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 0.54 |  |  | $ | 0.51 |
Diluted |  | $ | 0.54 |  |  | $ | 0.51 |

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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://www.xbrl.org/2003/role/presentationRef -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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