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Marketable securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Marketable securities |
Schedule of Marketable Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair value | ​ | ​ | ​ | ​ | Cost or | ​ | ​ | ​
​ | ​ | measurement | ​ | Market | ​ | amortized | ​ | Unrealized
​ |  | level |  | value |  | cost |  | gain (loss), net
​ | ​ | ​ | ​ | (In thousands)
December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets - Valhi common stock |  | 1 | ​ | $ | 28,015 | ​ | $ | 24,347 | ​ | $ | 3,668
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
June 30, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Noncurrent assets - Valhi common stock | ​ | 1 | ​ | $ | 19,356 | ​ | $ | 24,347 | ​ | $ | (4,991)

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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