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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net earnings $ 89,798 $ 94,378 $ 171,124 $ 170,648
Other comprehensive loss, net of taxes:        
Pension and postretirement benefits (3,870) (4,199) (6,230) (6,066)
Foreign currency translation adjustments 423 178 562 486
Total other comprehensive loss, net of taxes (3,447) (4,021) (5,668) (5,580)
Total comprehensive income, net of taxes 86,351 90,357 165,456 165,068
Net earnings attributable to noncontrolling interests (69) (101) (198) (385)
Comprehensive income attributable to Kirby $ 86,282 $ 90,256 $ 165,258 $ 164,683