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Other comprehensive income (loss) (accumulated other comprehensive loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated other comprehensive loss [Line Items]        
Amounts reclassified from accumulated other comprehensive loss $ 326 $ 416 $ 656 $ 555
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 83 208 166 416
Net current-period other comprehensive income (loss)     166  
Balance, June 30, 2021 (21,790)   (21,790)  
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]     (189)  
Amounts reclassified from accumulated other comprehensive loss     0  
Net current-period other comprehensive income (loss)     (189)  
Balance, June 30, 2021 (279)   (279)  
Unrealized loss on securities arising during the period, tax     (66)  
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]     799  
Amounts reclassified from accumulated other comprehensive loss 243 $ 208 490 $ 139
Net current-period other comprehensive income (loss)     1,289  
Balance, June 30, 2021 (4,062)   (4,062)  
Unrealized gain on cash flow hedge arising during the period, tax (benefit) expense     283  
Currency translation adjustment [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (14,036)  
Other comprehensive (loss) income before reclassifications     2,338  
Amounts reclassified from accumulated other comprehensive loss     0  
Net current-period other comprehensive income (loss)     2,338  
Balance, June 30, 2021 (11,698)   (11,698)  
Accumulated other comprehensive loss [Member]        
Accumulated other comprehensive loss [Line Items]        
Balance, December 31, 2020     (41,433)  
Other comprehensive (loss) income before reclassifications     2,948  
Amounts reclassified from accumulated other comprehensive loss     656  
Net current-period other comprehensive income (loss)     3,604  
Balance, June 30, 2021 $ (37,829)   $ (37,829)  
[1] Other comprehensive loss before reclassifications is net of an income tax benefit of $66.
[2] Other comprehensive income before reclassifications is net of income tax expense of $283.