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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Results (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 484,138 | $ 532,565 | $ 543,156 | $ 587,673 | $ 668,297 | $ 680,721 | $ 628,054 | $ 589,246 | $ 2,147,532 | $ 2,566,318 | $ 2,242,195
Costs and expenses | 400,178 | 437,115 | 445,113 | 486,136 | 554,646 | 552,642 | 501,556 | 482,443 | 1,766,870 | 2,090,506 | 1,806,013
Gain (loss) on disposition of assets | 426 | (400) | 91 | 1,555 | 156 | 47 | 527 | 51 | 1,672 | 781 | 888
Operating income | 84,386 | 95,050 | 98,134 | 103,092 | 113,807 | 128,126 | 127,025 | 106,854 | 380,662 | 475,812 | 436,182
Other income (expense) | 9 | 22 | (303) | 60 | 125 | 27 | 123 | (236) | (663) | (345) | 20
Interest expense | (4,280) | (4,449) | (4,759) | (5,250) | (5,149) | (5,225) | (5,469) | (5,618) | (18,738) | (21,461) | (27,872)
Earnings before taxes on income | 80,115 | 90,623 | 93,072 | 97,902 | 108,783 | 122,928 | 121,679 | 101,000 | 361,712 | 454,390 | 408,678
Provision for taxes on income | (29,043) | (33,512) | (34,696) | (36,491) | (40,310) | (45,715) | (45,768) | (37,989) | (133,742) | (169,782) | (152,379)
Net earnings | 51,072 | 57,111 | 58,376 | 61,411 | 68,473 | 77,213 | 75,911 | 63,011 | 227,970 | 284,608 | 256,299
Less: Net earnings attributable to noncontrolling interests | (384) | (268) | (301) | (333) | (422) | (496) | (919) | (765) | (1,286) | (2,602) | (3,238)
Net earnings attributable to Kirby | $ 50,688 | $ 56,843 | $ 58,075 | $ 61,078 | $ 68,051 | $ 76,717 | $ 74,992 | $ 62,246 | $ 226,684 | $ 282,006 | $ 253,061
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 1.19 | $ 1.34 | $ 1.32 | $ 1.09 | $ 4.12 | $ 4.95 | $ 4.46
Diluted (in dollars per share) | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 1.19 | $ 1.34 | $ 1.31 | $ 1.09 | $ 4.11 | $ 4.93 | $ 4.44

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