CONDENSED STATEMENTS OF EARNINGS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Marine transportation	$ 436,181	$ 349,771	$ 1,278,567	$ 1,027,923
Diesel engine services	114,924	171,553	395,231	572,184
Total revenues	551,105	521,324	1,673,798	1,600,107
Costs and expenses:
Costs of sales and operating expenses	344,396	344,990	1,083,257	1,075,265
Selling, general and administrative	43,241	44,473	128,335	140,772
Taxes, other than on income	3,714	3,455	12,589	11,276
Depreciation and amortization	41,640	35,729	122,907	107,400
Loss (gain) on disposition of assets	(223)	40	(728)	(1)
Total costs and expenses	432,768	428,687	1,346,360	1,334,712
Operating income	118,337	92,637	327,438	265,395
Other income (expense)	60	(56)	236	123
Interest expense	(6,694)	(6,056)	(21,901)	(17,797)
Earnings before taxes on income	111,703	86,525	305,773	247,721
Provision for taxes on income	(42,007)	(32,794)	(114,733)	(93,676)
Net earnings	69,696	53,731	191,040	154,045
Less: Net earnings attributable to noncontrolling interests	(573)	(676)	(2,246)	(2,495)
Net earnings attributable to Kirby	$ 69,123	$ 53,055	$ 188,794	$ 151,550
Net earnings per share attributable to Kirby common stockholders:
Basic (in dollars per share)	$ 1.22	$ 0.95	$ 3.33	$ 2.71
Diluted (in dollars per share)	$ 1.21	$ 0.95	$ 3.32	$ 2.70