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Other comprehensive income (accumulated other comprehensive loss) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
Postretirement benefit plans [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 $ (26,872)
Other comprehensive income (loss) before reclassifications 0
Amounts reclassified from accumulated other comprehensive loss 197
Net current-period other comprehensive income (loss) 197
Balance, March 31, 2023 (26,675)
Net unrealized loss on debt securities [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (909)
Other comprehensive income (loss) before reclassifications 123 [1]
Amounts reclassified from accumulated other comprehensive loss 0
Net current-period other comprehensive income (loss) 123
Balance, March 31, 2023 (786)
Unrealized gain on debt securities arising during the period, tax expense (43)
Net unrealized gain (loss) on cash flow hedges [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 2,593
Other comprehensive income (loss) before reclassifications (2,872) [2]
Amounts reclassified from accumulated other comprehensive loss (418)
Net current-period other comprehensive income (loss) (3,290)
Balance, March 31, 2023 (697)
Unrealized loss on cash flow hedge arising during the period, tax benefit (1,045)
Currency translation adjustment [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (12,076)
Other comprehensive income (loss) before reclassifications 227
Amounts reclassified from accumulated other comprehensive loss 0
Net current-period other comprehensive income (loss) 227
Balance, March 31, 2023 (11,849)
Accumulated other comprehensive loss [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (37,264)
Other comprehensive income (loss) before reclassifications (2,522)
Amounts reclassified from accumulated other comprehensive loss (221)
Net current-period other comprehensive income (loss) (2,743)
Balance, March 31, 2023 $ (40,007)
[1] Other comprehensive income before reclassifications is net of income tax expense of $43
[2] Other comprehensive loss before reclassifications is net of an income tax benefit of $1,045.