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Quarterly Results (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Quarterly Results (Unaudited) [Abstract] |
Quarterly Results (Unaudited) | (11) Quarterly Results (Unaudited) The unaudited quarterly results for the year ended December 31, 2015 were as follows (in thousands, except per share amounts):
|  | Three Months Ended |
|  | March 31, 2015 |  |  | June 30, 2015 |  |  | September 30, 2015 |  |  | December 31, 2015 |
Revenues |  | $ | 587,673 |  |  | $ | 543,156 |  |  | $ | 532,565 |  |  | $ | 484,138 |
Costs and expenses |  |  | 486,136 |  |  |  | 445,113 |  |  |  | 437,115 |  |  |  | 400,178 |
Gain (loss) on disposition of assets |  |  | 1,555 |  |  |  | 91 |  |  |  | (400 | ) |  |  | 426 |
Operating income |  |  | 103,092 |  |  |  | 98,134 |  |  |  | 95,050 |  |  |  | 84,386 |
Other income (expense) |  |  | 60 |  |  |  | (303 | ) |  |  | 22 |  |  |  | 9 |
Interest expense |  |  | (5,250 | ) |  |  | (4,759 | ) |  |  | (4,449 | ) |  |  | (4,280 | )
Earnings before taxes on income |  |  | 97,902 |  |  |  | 93,072 |  |  |  | 90,623 |  |  |  | 80,115 |
Provision for taxes on income |  |  | (36,491 | ) |  |  | (34,696 | ) |  |  | (33,512 | ) |  |  | (29,043 | )
Net earnings |  |  | 61,411 |  |  |  | 58,376 |  |  |  | 57,111 |  |  |  | 51,072 |
Less: Net earnings attributable to noncontrolling interests |  |  | (333 | ) |  |  | (301 | ) |  |  | (268 | ) |  |  | (384 | )
Net earnings attributable to Kirby |  | $ | 61,078 |  |  | $ | 58,075 |  |  | $ | 56,843 |  |  | $ | 50,688 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.09 |  |  | $ | 1.04 |  |  | $ | 1.04 |  |  | $ | 0.94 |
Diluted |  | $ | 1.09 |  |  | $ | 1.04 |  |  | $ | 1.04 |  |  | $ | 0.94 |
The unaudited quarterly results for the year ended December 31, 2014 were as follows (in thousands, except per share amounts):
|  | Three Months Ended |
|  | March 31, 2014 |  |  | June 30, 2014 |  |  | September 30, 2014 |  |  | December 31, 2014 |
Revenues |  | $ | 589,246 |  |  | $ | 628,054 |  |  | $ | 680,721 |  |  | $ | 668,297 |
Costs and expenses |  |  | 482,443 |  |  |  | 501,556 |  |  |  | 552,642 |  |  |  | 554,646 |
Gain on disposition of assets |  |  | 51 |  |  |  | 527 |  |  |  | 47 |  |  |  | 156 |
Operating income |  |  | 106,854 |  |  |  | 127,025 |  |  |  | 128,126 |  |  |  | 113,807 |
Other income (expense) |  |  | (236 | ) |  |  | 123 |  |  |  | 27 |  |  |  | 125 |
Interest expense |  |  | (5,618 | ) |  |  | (5,469 | ) |  |  | (5,225 | ) |  |  | (5,149 | )
Earnings before taxes on income |  |  | 101,000 |  |  |  | 121,679 |  |  |  | 122,928 |  |  |  | 108,783 |
Provision for taxes on income |  |  | (37,989 | ) |  |  | (45,768 | ) |  |  | (45,715 | ) |  |  | (40,310 | )
Net earnings |  |  | 63,011 |  |  |  | 75,911 |  |  |  | 77,213 |  |  |  | 68,473 |
Less: Net earnings attributable to noncontrolling interests |  |  | (765 | ) |  |  | (919 | ) |  |  | (496 | ) |  |  | (422 | )
Net earnings attributable to Kirby |  | $ | 62,246 |  |  | $ | 74,992 |  |  | $ | 76,717 |  |  | $ | 68,051 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.09 |  |  | $ | 1.32 |  |  | $ | 1.34 |  |  | $ | 1.19 |
Diluted |  | $ | 1.09 |  |  | $ | 1.31 |  |  | $ | 1.34 |  |  | $ | 1.19 |
Quarterly basic and diluted earnings per share may not total to the full year per share amounts, as the weighted average number of shares outstanding for each quarter fluctuates as a result of the assumed exercise of stock options.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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