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CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Revenues: |  |
Marine transportation | $ 435,771 | $ 418,518
Diesel engine services | 153,475 | 140,267
Total revenues | 589,246 | 558,785
Costs and expenses: |  |
Costs of sales and operating expenses | 383,229 | 369,274
Selling, general and administrative | 53,598 | 44,156
Taxes, other than on income | 4,580 | 4,478
Depreciation and amortization | 41,036 | 40,996
Loss (gain) on disposition of assets | (51) | 32
Total costs and expenses | 482,392 | 458,936
Operating income | 106,854 | 99,849
Other income (expense) | (236) | 75
Interest expense | (5,618) | (7,988)
Earnings before taxes on income | 101,000 | 91,936
Provision for taxes on income | (37,989) | (34,384)
Net earnings | 63,011 | 57,552
Less: Net earnings attributable to noncontrolling interests | (765) | (974)
Net earnings attributable to Kirby | $ 62,246 | $ 56,578
Net earnings per share attributable to Kirby common stockholders: |  |
Basic (in dollars per share) | $ 1.09 | $ 1.00
Diluted (in dollars per share) | $ 1.09 | $ 1.00

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