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Other comprehensive income (loss) (accumulated other comprehensive loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Postretirement benefit plans [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | $ (19,824) |  | $ (26,872) |
Other comprehensive income (loss) before reclassifications |  | 0 |  | 0 |
Amounts reclassified from accumulated other comprehensive loss |  | 22 |  | 197 |
Net current-period other comprehensive income (loss) |  | 22 |  | 197 |
Balance, end of period |  | (19,802) |  | (26,675) |
Net unrealized loss on debt securities [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  |  |  | (909) |
Other comprehensive income (loss) before reclassifications | [1] |  |  | 123 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 0 |
Net current-period other comprehensive income (loss) |  |  |  | 123 |
Balance, end of period |  |  |  | (786) |
Unrealized gain on debt securities arising during the period, tax expense |  |  |  | 43 |
Net unrealized gain (loss) on cash flow hedges [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | (286) |  | 2,593 |
Other comprehensive income (loss) before reclassifications |  | 5,864 | [2] | (2,872) | [3]
Amounts reclassified from accumulated other comprehensive loss |  | (668) |  | (418) |
Net current-period other comprehensive income (loss) |  | 5,196 |  | (3,290) |
Balance, end of period |  | 4,910 |  | (697) |
Unrealized loss on cash flow hedge arising during the period, tax expense (benefit) |  | 2,169 |  | (1,045) |
Currency translation adjustment [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | (9,918) |  | (12,076) |
Other comprehensive income (loss) before reclassifications |  | (1,027) |  | 227 |
Amounts reclassified from accumulated other comprehensive loss |  | 0 |  | 0 |
Net current-period other comprehensive income (loss) |  | (1,027) |  | 227 |
Balance, end of period |  | (10,945) |  | (11,849) |
Accumulated other comprehensive loss [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | (30,028) |  | (37,264) |
Other comprehensive income (loss) before reclassifications |  | 4,837 |  | (2,522) |
Amounts reclassified from accumulated other comprehensive loss |  | (646) |  | (221) |
Net current-period other comprehensive income (loss) |  | 4,191 |  | (2,743) |
Balance, end of period |  | $ (25,837) |  | $ (40,007) |
[1] | Other comprehensive income before reclassifications is net of income tax expense of $43.
[2] | Other comprehensive income before reclassifications is net of income tax expense of $2,169.
[3] | Other comprehensive loss before reclassifications is net of an income tax benefit of $1,045.

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