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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.

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