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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings (loss)	$ 10,352	$ 25,263	$ 7,232	$ (321,700)
Other comprehensive income (loss), net of taxes:
Pension and postretirement benefits	3,607	(2,477)	4,352	(2,395)
Foreign currency translation adjustments	(86)	351	(583)	(923)
Total other comprehensive income (loss), net of taxes	3,521	(2,126)	3,769	(3,318)
Total comprehensive income (loss), net of taxes	13,873	23,137	11,001	(325,018)
Net earnings attributable to noncontrolling interests	(162)	(261)	(417)	(539)
Comprehensive income (loss) attributable to Kirby	$ 13,711	$ 22,876	$ 10,584	$ (325,557)

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