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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net earnings	$ 75,911	$ 63,792	$ 138,922	$ 121,344
Other comprehensive income (loss), net of taxes:
Pension and postretirement benefits	444	494	468	1,671
Foreign currency translation adjustments	9	44	(8)	249
Change in fair value of derivative instruments	0	(4)	84	970
Total other comprehensive income (loss), net of taxes	453	534	544	2,890
Total comprehensive income, net of taxes	76,364	64,326	139,466	124,234
Net earnings attributable to noncontrolling interests	(919)	(699)	(1,684)	(1,673)
Comprehensive income attributable to Kirby	$ 75,445	$ 63,627	$ 137,782	$ 122,561

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