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Other comprehensive income (loss) (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Postretirement benefit plans [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, beginning of period $ (19,824) $ (26,872)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive loss 68 590
Net current-period other comprehensive income (loss) 68 590
Balance, end of period (19,756) (26,282)
Net unrealized loss on debt securities [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, beginning of period   (909)
Other comprehensive income (loss) before reclassifications [1]   (183)
Amounts reclassified from accumulated other comprehensive loss   0
Net current-period other comprehensive income (loss)   (183)
Balance, end of period   (1,092)
Unrealized loss on debt securities arising during the period, tax benefit   (63)
Net unrealized (loss) gain on cash flow hedges [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, beginning of period (286) 2,593
Other comprehensive income (loss) before reclassifications (1,013) [2] 8,487 [3]
Amounts reclassified from accumulated other comprehensive loss (1,928) (1,603)
Net current-period other comprehensive income (loss) (2,941) 6,884
Balance, end of period (3,227) 9,477
Unrealized (loss) gain on cash flow hedges arising during the period, tax (benefit) expense (375) 3,114
Currency translation adjustment [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, beginning of period (9,918) (12,076)
Other comprehensive income (loss) before reclassifications (951) 460
Amounts reclassified from accumulated other comprehensive loss 0 863
Net current-period other comprehensive income (loss) (951) 1,323
Balance, end of period (10,869) (10,753)
Accumulated other comprehensive loss [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, beginning of period (30,028) (37,264)
Other comprehensive income (loss) before reclassifications (1,964) 8,764
Amounts reclassified from accumulated other comprehensive loss (1,860) (150)
Net current-period other comprehensive income (loss) (3,824) 8,614
Balance, end of period $ (33,852) $ (28,650)
[1] Other comprehensive loss before reclassifications is net of an income tax benefit of $63.
[2] Other comprehensive loss before reclassifications is net of an income tax benefit of $375.
[3] Other comprehensive income before reclassifications is net of income tax expense of $3,114.