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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 2014 and 2013 (in thousands, except per share amounts):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Net earnings attributable to Kirby |  | $ | 226,684 |  |  | $ | 282,006 |  |  | $ | 253,061 |
Undistributed earnings allocated to restricted shares |  |  | (1,345 | ) |  |  | (1,643 | ) |  |  | (1,819 | )
Income available to Kirby common stockholders — basic |  |  | 225,339 |  |  |  | 280,363 |  |  |  | 251,242 |
Undistributed earnings allocated to restricted shares |  |  | 1,345 |  |  |  | 1,643 |  |  |  | 1,819 |
Undistributed earnings reallocated to restricted shares |  |  | (1,343 | ) |  |  | (1,637 | ) |  |  | (1,813 | )
Income available to Kirby common stockholders — diluted |  | $ | 225,341 |  |  | $ | 280,369 |  |  | $ | 251,248 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 55,056 |  |  |  | 57,006 |  |  |  | 56,762 |
Weighted average unvested restricted stock |  |  | (327 | ) |  |  | (332 | ) |  |  | (408 | )
Weighted average common stock outstanding — basic |  |  | 54,729 |  |  |  | 56,674 |  |  |  | 56,354 |
Dilutive effect of stock options |  |  | 97 |  |  |  | 193 |  |  |  | 198 |
Weighted average common stock outstanding — diluted |  |  | 54,826 |  |  |  | 56,867 |  |  |  | 56,552 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 4.12 |  |  | $ | 4.95 |  |  | $ | 4.46 |
Diluted |  | $ | 4.11 |  |  | $ | 4.93 |  |  | $ | 4.44 |

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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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