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Accumulated other comprehensive loss - Accumulated Other Comprehensive Income Loss and Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 2,431,835 $ 2,072,797 $ 1,849,541
Other comprehensive loss (136,849) 63,391 (70,198)
Ending balance 2,286,213 2,431,835 2,072,797
Foreign Currency Items      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (267,578) (338,316)  
Other comprehensive income/(loss) before reclassifications (146,856) 68,705  
Amounts reclassified from accumulated other comprehensive loss to net income 3,503 2,033  
Amounts reclassified from accumulated other comprehensive loss to fixed assets   0  
Other comprehensive loss (143,353) 70,738  
Ending balance (410,931) (267,578) (338,316)
Defined Benefit Pension Items      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (99,627) (90,973)  
Other comprehensive income/(loss) before reclassifications 4,636 (16,305)  
Amounts reclassified from accumulated other comprehensive loss to net income 4,378 7,651  
Amounts reclassified from accumulated other comprehensive loss to fixed assets   0  
Other comprehensive loss 9,014 (8,654)  
Ending balance (90,613) (99,627) (90,973)
Gains and Losses on Cash Flow Hedges      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 943 (794)  
Other comprehensive income/(loss) before reclassifications (3,213) 6,622  
Amounts reclassified from accumulated other comprehensive loss to net income 1,080 (5,177)  
Amounts reclassified from accumulated other comprehensive loss to fixed assets   292  
Other comprehensive loss (2,133) 1,737  
Ending balance (1,190) 943 (794)
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (366,262) (430,083)  
Other comprehensive income/(loss) before reclassifications (145,433) 59,022  
Amounts reclassified from accumulated other comprehensive loss to net income 8,961 4,507  
Amounts reclassified from accumulated other comprehensive loss to fixed assets   292  
Other comprehensive loss (136,472) 63,821  
Ending balance $ (502,734) $ (366,262) $ (430,083)