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CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues: |  |  |
Marine transportation | $ 1,663,090 | $ 1,770,684 | $ 1,713,167
Diesel engine services | 484,442 | 795,634 | 529,028
Total revenues | 2,147,532 | 2,566,318 | 2,242,195
Costs and expenses: |  |  |
Costs of sales and operating expenses | 1,362,366 | 1,694,882 | 1,448,805
Selling, general and administrative | 193,237 | 210,416 | 177,766
Taxes, other than on income | 20,699 | 16,677 | 15,893
Depreciation and amortization | 192,240 | 169,312 | 164,437
Gain on disposition of assets | (1,672) | (781) | (888)
Total costs and expenses | 1,766,870 | 2,090,506 | 1,806,013
Operating income | 380,662 | 475,812 | 436,182
Equity in earnings of affiliates | 451 | 384 | 348
Other income (expense) | (663) | (345) | 20
Interest expense | (18,738) | (21,461) | (27,872)
Earnings before taxes on income | 361,712 | 454,390 | 408,678
Provision for taxes on income | (133,742) | (169,782) | (152,379)
Net earnings | 227,970 | 284,608 | 256,299
Less: Net earnings attributable to noncontrolling interests | (1,286) | (2,602) | (3,238)
Net earnings attributable to Kirby | $ 226,684 | $ 282,006 | $ 253,061
Net earnings per share attributable to Kirby common stockholders: |  |  |
Basic (in dollars per share) | $ 4.12 | $ 4.95 | $ 4.46
Diluted (in dollars per share) | $ 4.11 | $ 4.93 | $ 4.44

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