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Other comprehensive income (loss) (accumulated other comprehensive loss) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 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 |  | 68 |  | 590 |
Net current-period other comprehensive income (loss) |  | 68 |  | 590 |
Balance, end of period |  | (19,756) |  | (26,282) |
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] |  |  | (183) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 0 |
Net current-period other comprehensive income (loss) |  |  |  | (183) |
Balance, end of period |  |  |  | (1,092) |
Unrealized loss on debt securities arising during the period, tax benefit |  |  |  | (63) |
Net unrealized (loss) gain on cash flow hedges [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | (286) |  | 2,593 |
Other comprehensive income (loss) before reclassifications |  | (1,013) | [2] | 8,487 | [3]
Amounts reclassified from accumulated other comprehensive loss |  | (1,928) |  | (1,603) |
Net current-period other comprehensive income (loss) |  | (2,941) |  | 6,884 |
Balance, end of period |  | (3,227) |  | 9,477 |
Unrealized (loss) gain on cash flow hedges arising during the period, tax (benefit) expense |  | (375) |  | 3,114 |
Currency translation adjustment [Member] |  |  |  |  |
Accumulated other comprehensive loss [Line Items] |  |  |  |  |
Balance, beginning of period |  | (9,918) |  | (12,076) |
Other comprehensive income (loss) before reclassifications |  | (951) |  | 460 |
Amounts reclassified from accumulated other comprehensive loss |  | 0 |  | 863 |
Net current-period other comprehensive income (loss) |  | (951) |  | 1,323 |
Balance, end of period |  | (10,869) |  | (10,753) |
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 |  | (1,964) |  | 8,764 |
Amounts reclassified from accumulated other comprehensive loss |  | (1,860) |  | (150) |
Net current-period other comprehensive income (loss) |  | (3,824) |  | 8,614 |
Balance, end of period |  | $ (33,852) |  | $ (28,650) |
[1] | Other comprehensive loss before reclassifications is net of an income tax benefit of $63.
[2] | Other comprehensive loss before reclassifications is net of an income tax benefit of $375.
[3] | Other comprehensive income before reclassifications is net of income tax expense of $3,114.

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