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Other comprehensive income (loss) (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated other comprehensive loss [Line Items]        
Amounts reclassified from accumulated other comprehensive loss $ 356 $ 449 $ 1,012 $ 1,004
Postretirement benefit plans [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (21,956)  
Other comprehensive (loss) income before reclassifications     0  
Amounts reclassified from accumulated other comprehensive loss 82 208 248 624
Net current-period other comprehensive income (loss)     248  
Balance, September 30, 2021 (21,708)   (21,708)  
Net unrealized loss on available-for-sale debt securities [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (90)  
Other comprehensive (loss) income before reclassifications [1]     (208)  
Amounts reclassified from accumulated other comprehensive loss     0  
Net current-period other comprehensive income (loss)     (208)  
Balance, September 30, 2021 (298)   (298)  
Unrealized loss on securities arising during the period, tax     (72)  
Net unrealized loss on cash flow hedge [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (5,351)  
Other comprehensive (loss) income before reclassifications [2]     1,077  
Amounts reclassified from accumulated other comprehensive loss 274 $ 241 764 $ 380
Net current-period other comprehensive income (loss)     1,841  
Balance, September 30, 2021 (3,510)   (3,510)  
Unrealized gain on cash flow hedge arising during the period, tax expense     382  
Currency translation adjustment [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (14,036)  
Other comprehensive (loss) income before reclassifications     (679)  
Amounts reclassified from accumulated other comprehensive loss     0  
Net current-period other comprehensive income (loss)     (679)  
Balance, September 30, 2021 (14,715)   (14,715)  
Accumulated other comprehensive loss [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (41,433)  
Other comprehensive (loss) income before reclassifications     190  
Amounts reclassified from accumulated other comprehensive loss     1,012  
Net current-period other comprehensive income (loss)     1,202  
Balance, September 30, 2021 $ (40,231)   $ (40,231)  
[1] Other comprehensive loss before reclassifications is net of an income tax benefit of $72.
[2] Other comprehensive income before reclassifications is net of income tax expense of $382.