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Earnings Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Earnings Per Share | (11) Earnings Per Share The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2016, 2015 and 2014 (in thousands, except per share amounts):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Net earnings attributable to Kirby |  | $ | 141,406 |  |  | $ | 226,684 |  |  | $ | 282,006 |
Undistributed earnings allocated to restricted shares |  |  | (999 | ) |  |  | (1,345 | ) |  |  | (1,643 | )
Income available to Kirby common stockholders — basic |  |  | 140,407 |  |  |  | 225,339 |  |  |  | 280,363 |
Undistributed earnings allocated to restricted shares |  |  | 999 |  |  |  | 1,345 |  |  |  | 1,643 |
Undistributed earnings reallocated to restricted shares |  |  | (997 | ) |  |  | (1,343 | ) |  |  | (1,637 | )
Income available to Kirby common stockholders — diluted |  | $ | 140,409 |  |  | $ | 225,341 |  |  | $ | 280,369 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 53,834 |  |  |  | 55,056 |  |  |  | 57,006 |
Weighted average unvested restricted stock |  |  | (380 | ) |  |  | (327 | ) |  |  | (332 | )
Weighted average common stock outstanding — basic |  |  | 53,454 |  |  |  | 54,729 |  |  |  | 56,674 |
Dilutive effect of stock options |  |  | 58 |  |  |  | 97 |  |  |  | 193 |
Weighted average common stock outstanding — diluted |  |  | 53,512 |  |  |  | 54,826 |  |  |  | 56,867 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.63 |  |  | $ | 4.12 |  |  | $ | 4.95 |
Diluted |  | $ | 2.62 |  |  | $ | 4.11 |  |  | $ | 4.93 |
Certain outstanding options to purchase approximately 240,000, 227,000 and 75,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2016, 2015 and 2014, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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