CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Marine transportation	$ 423,868	$ 342,195	$ 842,386	$ 678,152
Diesel engine services	140,040	169,653	280,307	400,631
Total revenues	563,908	511,848	1,122,693	1,078,783
Costs and expenses:
Costs of sales and operating expenses	369,587	345,916	738,861	730,275
Selling, general and administrative	40,938	43,199	85,094	96,299
Taxes, other than on income	4,397	3,907	8,875	7,821
Depreciation and amortization	40,271	35,197	81,267	71,671
Loss on disposition of assets	(537)	(69)	(505)	(41)
Total costs and expenses	454,656	428,150	913,592	906,025
Operating income	109,252	83,698	209,101	172,758
Other income	101	30	176	179
Interest expense	(7,219)	(5,901)	(15,207)	(11,741)
Earnings before taxes on income	102,134	77,827	194,070	161,196
Provision for taxes on income	(38,342)	(29,392)	(72,726)	(60,882)
Net earnings	63,792	48,435	121,344	100,314
Less: Net earnings attributable to noncontrolling interests	(699)	(884)	(1,673)	(1,819)
Net earnings attributable to Kirby	$ 63,093	$ 47,551	$ 119,671	$ 98,495
Net earnings per share attributable to Kirby common stockholders:
Basic (in dollars per share)	$ 1.11	$ 0.85	$ 2.11	$ 1.76
Diluted (in dollars per share)	$ 1.11	$ 0.85	$ 2.10	$ 1.76