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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.

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