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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net income (loss) $ (7,368) $ 36,374 $ (4,992) $ 52,142
Other comprehensive income (loss), net of tax:        
Currency translation 30 1,521 7,652 (2,979)
Defined benefit pension plans 326 378 966 1,135
Marketable debt securities   (7)   15
Other postretirement benefit plans (31) (45) (95) (137)
Total other comprehensive income (loss), net 325 1,847 8,523 (1,966)
Comprehensive income (loss) (7,043) 38,221 3,531 50,176
Comprehensive income attributable to noncontrolling interest 503 364 1,857 1,458
Comprehensive income (loss) attributable to NL stockholders $ (7,546) $ 37,857 $ 1,674 $ 48,718