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