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Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Results (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 489,756 | $ 496,567 | $ 541,159 | $ 643,926 | $ 655,927 | $ 666,809 | $ 771,042 | $ 744,621 |  |  |
Costs and expenses | 465,113 | 466,340 | 506,718 | 1,154,114 | 643,001 | 588,534 | 698,317 | 674,672 |  |  |
Gain (loss) on disposition of assets | 131 | (316) | (189) | 492 | 3,251 | (374) | 3,118 | 2,157 | $ 118 | $ 8,152 | $ 1,968
Operating income (loss) | 24,774 | 29,911 | 34,252 | (509,696) | 16,177 | 77,901 | 75,843 | 72,106 | (420,759) | 242,027 | 155,289
Other income | 1,962 | 1,172 | 2,290 | 2,723 | 1,110 | 864 | 2,381 | (568) |  |  |
Interest expense | (11,423) | (11,809) | (12,708) | (12,799) | (12,968) | (14,310) | (15,515) | (13,201) | (48,739) | (55,994) | (46,856)
Earnings (loss) before taxes on income | 15,313 | 19,274 | 23,834 | (519,772) | 4,319 | 64,455 | 62,709 | 58,337 | (461,351) | 189,820 | 114,159
Benefit (provision) for taxes on income | 7,102 | 8,419 | 1,429 | 172,809 | (1,347) | (16,305) | (15,269) | (13,880) | 189,759 | (46,801) | (35,081)
Net earnings (loss) | 22,415 | 27,693 | 25,263 | (346,963) | 2,972 | 48,150 | 47,440 | 44,457 | (271,592) | 143,019 | 79,078
Less: Net earnings attributable to noncontrolling interests | (211) | (204) | (261) | (278) | (195) | (163) | (153) | (161) | (954) | (672) | (626)
Net earnings (loss) attributable to Kirby | $ 22,204 | $ 27,489 | $ 25,002 | $ (347,241) | $ 2,777 | $ 47,987 | $ 47,287 | $ 44,296 | $ (272,546) | $ 142,347 | $ 78,452
Net earnings (loss) per share attributable to Kirby common stockholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.37 | $ 0.46 | $ 0.42 | $ (5.80) | $ 0.05 | $ 0.80 | $ 0.79 | $ 0.74 | $ (4.55) | $ 2.38 | $ 1.31
Diluted (in dollars per share) | $ 0.37 | $ 0.46 | $ 0.42 | $ (5.80) | $ 0.05 | $ 0.80 | $ 0.79 | $ 0.74 | $ (4.55) | $ 2.37 | $ 1.31

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