CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Marine transportation	$ 343,652	$ 378,343
Diesel engine services	148,053	80,390
Total revenues	491,705	458,733
Costs and expenses:
Costs of sales and operating expenses	345,296	288,910
Selling, general and administrative	46,118	50,461
Taxes, other than on income	6,649	5,404
Depreciation and amortization	48,170	48,624
Gain on disposition of assets	(99)	(67)
Total costs and expenses	446,134	393,332
Operating income	45,571	65,401
Other income (expense)	(116)	135
Interest expense	(4,457)	(4,193)
Earnings before taxes on income	40,998	61,343
Provision for taxes on income	(13,353)	(22,859)
Net earnings	27,645	38,484
Less: Net earnings attributable to noncontrolling interests	(162)	(385)
Net earnings attributable to Kirby	$ 27,483	$ 38,099
Net earnings per share attributable to Kirby common stockholders:
Basic (in dollars per share)	$ 0.51	$ 0.71
Diluted (in dollars per share)	$ 0.51	$ 0.71