v3.26.1
Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Schedule Of Equity Method Investments [Line Items]        
Net sales $ 43,614 $ 40,366 $ 84,183 $ 80,638
Cost of sales 28,078 27,476 55,395 55,585
Income from operations 6,133 2,801 10,240 5,949
Income tax expense 2,462 (43) 3,934 (66)
Net income (loss) 8,954 355 13,298 1,022
Kronos | Reportable Legal Entities        
Schedule Of Equity Method Investments [Line Items]        
Net sales 558,100 494,400 1,067,900 984,200
Cost of sales 455,300 431,600 881,800 814,500
Income from operations 37,600 7,400 50,200 45,800
Income tax expense 7,700 3,500 10,500 11,100
Net income (loss) $ 15,200 $ (9,200) $ 10,400 $ 8,900