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Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period     $ 396,904  
Balance at end of period $ 375,377   375,377  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (177,801) $ (181,619) (185,423) $ (177,119)
Other comprehensive income (loss) 30 1,521 7,652 (2,979)
Balance at end of period (177,771) (180,098) (177,771) (180,098)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Pension Plan [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (36,026) (40,616) (36,666) (41,373)
Other comprehensive income (loss) 326 378 966 1,135
Balance at end of period (35,700) (40,238) (35,700) (40,238)
Other | OPEB plans        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (1,331) (1,206) (1,267) (1,114)
Other comprehensive income (loss) (31) (45) (95) (137)
Balance at end of period (1,362) (1,251) (1,362) (1,251)
Marketable debt securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period 0 7 0 (15)
Other comprehensive income (loss) 0 (7) 0 15
Balance at end of period 0 0 0 0
Total accumulated other comprehensive loss        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance at beginning of period (215,158) (223,434) (223,356) (219,621)
Other comprehensive income (loss) 325 1,847 8,523 (1,966)
Balance at end of period $ (214,833) $ (221,587) $ (214,833) $ (221,587)