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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, 2021
Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 1,910,528 $ 1,815,705
Ending Balance 1,849,541 1,910,528
Foreign Currency Items    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (194,024) (241,994)
Other comprehensive income/(loss) before reclassifications (75,052) 60,336
Other comprehensive income/(loss) (75,052) 47,970
Ending Balance (269,076) (194,024)
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 0 (12,366)
Defined Benefit Pension Items    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (562,747) (574,413)
Other comprehensive income/(loss) before reclassifications 49,145 (10,480)
Other comprehensive income/(loss) 471,350 11,666
Ending Balance (91,397) (562,747)
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 422,205 22,146
Gains and Losses on Cash Flow Hedges    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (71) (396)
Other comprehensive income/(loss) before reclassifications 7,589 (2,952)
Other comprehensive income/(loss) 1,119 325
Ending Balance 1,048 (71)
Gains and Losses on Cash Flow Hedges | Fixed assets    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Amounts reclassified from accumulated other comprehensive income (212) (1)
Gains and Losses on Cash Flow Hedges | Net Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Amounts reclassified from accumulated other comprehensive income (6,258) 3,278
Accumulated Other Comprehensive Loss    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance (756,842) (816,803)
Other comprehensive income/(loss) before reclassifications (18,318) 46,904
Other comprehensive income/(loss) 397,417 59,961
Ending Balance (359,425) (756,842)
Accumulated Other Comprehensive Loss | Fixed assets    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Amounts reclassified from accumulated other comprehensive income (212) (1)
Accumulated Other Comprehensive Loss | Net Income    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Amounts reclassified from accumulated other comprehensive income $ 415,947 $ 13,058