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Other comprehensive income (accumulated other comprehensive loss) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2023
USD ($)
Postretirement benefit plans [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 $ (26,872)
Other comprehensive (loss) income before reclassifications 0
Amounts reclassified from accumulated other comprehensive loss 394
Net current-period other comprehensive income (loss) 394
Balance, June 30, 2023 (26,478)
Net unrealized loss on debt securities [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (909)
Other comprehensive (loss) income before reclassifications (8) [1]
Amounts reclassified from accumulated other comprehensive loss 0
Net current-period other comprehensive income (loss) (8)
Balance, June 30, 2023 (917)
Unrealized gain on debt securities arising during the period, tax benefit 3
Net unrealized gain on cash flow hedges [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 2,593
Other comprehensive (loss) income before reclassifications 4,858 [2]
Amounts reclassified from accumulated other comprehensive loss (883)
Net current-period other comprehensive income (loss) 3,975
Balance, June 30, 2023 6,568
Unrealized loss on cash flow hedge arising during the period, tax expense 1,768
Currency translation adjustment [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (12,076)
Other comprehensive (loss) income before reclassifications 1,149
Amounts reclassified from accumulated other comprehensive loss 863
Net current-period other comprehensive income (loss) 2,012
Balance, June 30, 2023 (10,064)
Accumulated other comprehensive loss [Member]  
Accumulated other comprehensive loss [Line Items]  
Balance, December 31, 2022 (37,264)
Other comprehensive (loss) income before reclassifications 5,999
Amounts reclassified from accumulated other comprehensive loss 374
Net current-period other comprehensive income (loss) 6,373
Balance, June 30, 2023 $ (30,891)
[1] Other comprehensive loss before reclassifications is net of an income tax benefit of $3
[2] Other comprehensive income before reclassifications is net of income tax expense of $1,768.