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Other comprehensive income (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated other comprehensive loss [Line Items]    
Amounts reclassified from accumulated other comprehensive loss $ 182 $ 330
Postretirement benefit plans [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, December 31, 2021 (15,431)  
Other comprehensive (loss) income before reclassifications 0  
Amounts reclassified from accumulated other comprehensive loss (53) 83
Net current-period other comprehensive (loss) income (53)  
Balance, March 31, 2022 (15,484)  
Net unrealized loss on available-for-sale debt securities [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, December 31, 2021 (344)  
Other comprehensive (loss) income before reclassifications [1] (335)  
Amounts reclassified from accumulated other comprehensive loss 0  
Net current-period other comprehensive (loss) income (335)  
Balance, March 31, 2022 (679)  
Unrealized loss on securities arising during the period, tax (116)  
Net unrealized loss on cash flow hedge [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, December 31, 2021 (2,261)  
Other comprehensive (loss) income before reclassifications [2] 1,924  
Amounts reclassified from accumulated other comprehensive loss 235 $ 247
Net current-period other comprehensive (loss) income 2,159  
Balance, March 31, 2022 (102)  
Unrealized gain on cash flow hedge arising during the period, tax expense 679  
Currency translation adjustment [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, December 31, 2021 (13,456)  
Other comprehensive (loss) income before reclassifications 696  
Amounts reclassified from accumulated other comprehensive loss 0  
Net current-period other comprehensive (loss) income 696  
Balance, March 31, 2022 (12,760)  
Accumulated other comprehensive loss [Member]    
Accumulated other comprehensive loss [Line Items]    
Balance, December 31, 2021 (31,492)  
Other comprehensive (loss) income before reclassifications 2,285  
Amounts reclassified from accumulated other comprehensive loss 182  
Net current-period other comprehensive (loss) income 2,467  
Balance, March 31, 2022 $ (29,025)  
[1] Other comprehensive loss before reclassifications is net of an income tax benefit of $116.
[2] Other comprehensive income before reclassifications is net of income tax expense of $679.