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v3.25.2

Stockholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2025
Stockholders' equity |
Schedule of Changes in Accumulated Other Comprehensive Loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In thousands)
Accumulated other comprehensive loss, (net of tax and noncontrolling interest): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Currency translation: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (182,085) | ​ | $ | (181,238) | ​ | $ | (177,119) | ​ | $ | (185,423)
Other comprehensive income (loss) | ​ |  | 466 | ​ |  | 3,437 | ​ |  | (4,500) | ​ |  | 7,622
Balance at end of period | ​ | $ | (181,619) | ​ | $ | (177,801) | ​ | $ | (181,619) | ​ | $ | (177,801)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (40,994) | ​ | $ | (36,349) | ​ | $ | (41,373) | ​ | $ | (36,666)
Other comprehensive income - | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 378 | ​ |  | 323 | ​ |  | 757 | ​ |  | 640
Balance at end of period | ​ | $ | (40,616) | ​ | $ | (36,026) | ​ | $ | (40,616) | ​ | $ | (36,026)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,161) | ​ | $ | (1,300) | ​ | $ | (1,114) | ​ | $ | (1,267)
Other comprehensive loss - | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of net gain included in net periodic OPEB cost | ​ |  | (45) | ​ |  | (31) | ​ |  | (92) | ​ |  | (64)
Balance at end of period | ​ | $ | (1,206) | ​ | $ | (1,331) | ​ | $ | (1,206) | ​ | $ | (1,331)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | — | ​ | $ | — | ​ | $ | (15) | ​ | $ | —
Other comprehensive income - unrealized gain arising during the period | ​ | ​ | 7 | ​ | ​ | — | ​ |  | 22 | ​ |  | —
Balance at end of period | ​ | $ | 7 | ​ | $ | — | ​ | $ | 7 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (224,240) | ​ | $ | (218,887) | ​ | $ | (219,621) | ​ | $ | (223,356)
Other comprehensive income (loss) | ​ | ​ | 806 | ​ | ​ | 3,729 | ​ | ​ | (3,813) | ​ | ​ | 8,198
Balance at end of period | ​ | $ | (223,434) | ​ | $ | (215,158) | ​ | $ | (223,434) | ​ | $ | (215,158)

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