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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Results (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 435,650 | $ 434,708 | $ 441,582 | $ 458,733 | $ 484,138 | $ 532,565 | $ 543,156 | $ 587,673 | $ 1,770,673 | $ 2,147,532 | $ 2,566,318
Costs and expenses | 378,684 | 378,400 | 374,868 | 393,399 | 400,178 | 437,115 | 445,113 | 486,136 | 1,525,478 | 1,766,870 | 2,090,506
Gain (loss) on disposition of assets | (166) | (122) | 94 | 67 | 426 | (400) | 91 | 1,555 | (127) | 1,672 | 781
Operating income | 56,800 | 56,186 | 66,808 | 65,401 | 84,386 | 95,050 | 98,134 | 103,092 | 245,195 | 380,662 | 475,812
Other income (expense) | 47 | (120) | 179 | 135 | 9 | 22 | (303) | 60 | (291) | (663) | (345)
Interest expense | (4,477) | (4,507) | (4,513) | (4,193) | (4,280) | (4,449) | (4,759) | (5,250) | (17,690) | (18,738) | (21,461)
Earnings before taxes on income | 52,370 | 51,559 | 62,474 | 61,343 | 80,115 | 90,623 | 93,072 | 97,902 | 227,746 | 361,712 | 454,390
Provision for taxes on income | (19,512) | (19,206) | (23,365) | (22,859) | (29,043) | (33,512) | (34,696) | (36,491) | (84,942) | (133,742) | (169,782)
Net earnings | 32,858 | 32,353 | 39,109 | 38,484 | 51,072 | 57,111 | 58,376 | 61,411 | 142,804 | 227,970 | 284,608
Less: Net earnings attributable to noncontrolling interests | (503) | (343) | (167) | (385) | (384) | (268) | (301) | (333) | (1,398) | (1,286) | (2,602)
Net earnings attributable to Kirby | $ 32,355 | $ 32,010 | $ 38,942 | $ 38,099 | $ 50,688 | $ 56,843 | $ 58,075 | $ 61,078 | $ 141,406 | $ 226,684 | $ 282,006
Net earnings per share attributable to Kirby common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.60 | $ 0.59 | $ 0.72 | $ 0.71 | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 2.63 | $ 4.12 | $ 4.95
Diluted (in dollars per share) | $ 0.60 | $ 0.59 | $ 0.72 | $ 0.71 | $ 0.94 | $ 1.04 | $ 1.04 | $ 1.09 | $ 2.62 | $ 4.11 | $ 4.93

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