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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | (10) 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 |
Certain outstanding options to purchase approximately 227,000, 75,000 and 2,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2015, 2014 and 2013, respectively, as such stock options would have been antidilutive.

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