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Income taxes (Tables) | 9 Months Ended
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Sep. 30, 2025
Income taxes |
Schedule of Income Taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In thousands)
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 21% | ​ | $ | 9,425 | ​ | $ | (1,726) | ​ | $ | 13,217 | ​ | $ | (1,241)
Rate differences on equity in earnings (losses) of Kronos, net of dividends | ​ |  | (954) | ​ |  | 856 | ​ |  | (2,512) | ​ |  | 262
U.S. state income taxes and other, net | ​ |  | 37 | ​ |  | 16 | ​ |  | 93 | ​ |  | 59
Income tax expense (benefit) | ​ | $ | 8,508 | ​ | $ | (854) | ​ | $ | 10,798 | ​ | $ | (920)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Comprehensive provision (benefit) for income taxes allocable to: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net income (loss) | ​ | $ | 8,508 | ​ | $ | (854) | ​ | $ | 10,798 | ​ | $ | (920)
Additional paid-in capital | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8 | ​ | ​ | 8
Other comprehensive income (loss): | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |
Currency translation | ​ |  | 404 | ​ |  | 8 | ​ |  | (792) | ​ |  | 2,034
Pension plans | ​ |  | 99 | ​ |  | 87 | ​ |  | 301 | ​ |  | 257
Other | ​ |  | (14) | ​ |  | (7) | ​ |  | (33) | ​ |  | (25)
Total | ​ | $ | 8,997 | ​ | $ | (766) | ​ | $ | 10,282 | ​ | $ | 1,354

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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