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Earnings Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share |
(13) | 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 |
Certain outstanding options to purchase approximately 384,000, 472,000 and 240,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2018, 2017 and 2016, respectively, as such stock options would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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