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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance $ 2,072,797 $ 1,849,541 $ 1,910,528
Other comprehensive income/(loss) 63,391 (70,198) 396,833
Ending Balance 2,431,835 2,072,797 1,849,541
Foreign Currency Items      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (338,316) (269,076)  
Other comprehensive income/(loss) before reclassifications 68,705 (72,987)  
Other comprehensive income/(loss) 70,738 (69,240)  
Ending Balance (267,578) (338,316) (269,076)
Foreign Currency Items | Fixed assets      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 0 0  
Foreign Currency Items | Net Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 2,033 3,747  
Defined Benefit Pension Items      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (90,973) (91,397)  
Other comprehensive income/(loss) before reclassifications (16,305) (3,471)  
Other comprehensive income/(loss) (8,654) 424  
Ending Balance (99,627) (90,973) (91,397)
Defined Benefit Pension Items | Fixed assets      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 0 0  
Defined Benefit Pension Items | Net Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 7,651 3,895  
Gains and Losses on Cash Flow Hedges      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (794) 1,048  
Other comprehensive income/(loss) before reclassifications 6,622 3,244  
Other comprehensive income/(loss) 1,737 (1,842)  
Ending Balance 943 (794) 1,048
Gains and Losses on Cash Flow Hedges | Fixed assets      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 292 507  
Gains and Losses on Cash Flow Hedges | Net Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income (5,177) (5,593)  
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (430,083) (359,425)  
Other comprehensive income/(loss) before reclassifications 59,022 (73,214)  
Other comprehensive income/(loss) 63,821 (70,658)  
Ending Balance (366,262) (430,083) $ (359,425)
Accumulated Other Comprehensive Loss | Fixed assets      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income 292 507  
Accumulated Other Comprehensive Loss | Net Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income $ 4,507 $ 2,049