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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net earnings attributable to Kirby |  | $ | 78,452 |  |  | $ | 313,187 |  |  | $ | 141,406 |
Undistributed earnings allocated to restricted shares |  |  | (324 | ) |  |  | (2,213 | ) |  |  | (999 | )
Income available to Kirby common stockholders — basic |  |  | 78,128 |  |  |  | 310,974 |  |  |  | 140,407 |
Undistributed earnings allocated to restricted shares |  |  | 324 |  |  |  | 2,213 |  |  |  | 999 |
Undistributed earnings reallocated to restricted shares |  |  | (323 | ) |  |  | (2,211 | ) |  |  | (997 | )
Income available to Kirby common stockholders — diluted |  | $ | 78,129 |  |  | $ | 310,976 |  |  | $ | 140,409 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,804 |  |  |  | 55,702 |  |  |  | 53,834 |
Weighted average unvested restricted stock |  |  | (247 | ) |  |  | (394 | ) |  |  | (380 | )
Weighted average common stock outstanding — basic |  |  | 59,557 |  |  |  | 55,308 |  |  |  | 53,454 |
Dilutive effect of stock options and restricted stock units |  |  | 132 |  |  |  | 53 |  |  |  | 58 |
Weighted average common stock outstanding — diluted |  |  | 59,689 |  |  |  | 55,361 |  |  |  | 53,512 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.31 |  |  | $ | 5.62 |  |  | $ | 2.63 |
Diluted |  | $ | 1.31 |  |  | $ | 5.62 |  |  | $ | 2.62 |

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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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