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Accumulated other comprehensive loss - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Gains and losses on cash flow hedges: |  |
Defined benefit plan adjustment |  | $ 1,391
Foreign Currency Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | $ 67,411 | (72,987)
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | 1,294 | 0
Other comprehensive income/(loss) before reclassifications | 68,705 | (72,987)
Other comprehensive income/(loss), Before Tax Amount | 69,444 | (69,240)
Other comprehensive income/(loss), Tax (Expense) Benefit | 1,294 | 0
Other comprehensive income/(loss) | 70,738 | (69,240)
Defined Benefit Pension Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | (21,815) | (3,365)
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | 5,510 | (106)
Other comprehensive income/(loss) before reclassifications | (16,305) | (3,471)
Other comprehensive income/(loss), Before Tax Amount | (11,591) | 3,629
Other comprehensive income/(loss), Tax (Expense) Benefit | 2,937 | (3,205)
Other comprehensive income/(loss) | (8,654) | 424
Gains and Losses on Cash Flow Hedges |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | 9,081 | 4,312
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | (2,459) | (1,068)
Other comprehensive income/(loss) before reclassifications | 6,622 | 3,244
Other comprehensive income/(loss), Before Tax Amount | 2,382 | (2,439)
Other comprehensive income/(loss), Tax (Expense) Benefit | (645) | 597
Other comprehensive income/(loss) | 1,737 | (1,842)
Other comprehensive income/(loss) |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss), Before Tax Amount | 60,235 | (68,050)
Other comprehensive income/(loss), Tax (Expense) Benefit | 3,586 | (2,608)
Other comprehensive income/(loss) | 63,821 | (70,658)
Fixed assets | Gains and Losses on Cash Flow Hedges |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 401 | 805
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | (109) | (298)
Amounts reclassified from accumulated other comprehensive income/(loss) | 292 | 507
Net Income | Foreign Currency Items |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 2,033 | 3,747
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | 0 | 0
Amounts reclassified from accumulated other comprehensive income/(loss) | 2,033 | 3,747
Net Income | Defined Benefit Pension Items |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 10,224 | 6,994
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | (2,573) | (3,099)
Amounts reclassified from accumulated other comprehensive income/(loss) | 7,651 | 3,895
Net Income | Gains and Losses on Cash Flow Hedges |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | (7,100) | (7,556)
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | 1,923 | 1,963
Amounts reclassified from accumulated other comprehensive income/(loss) | $ (5,177) | $ (5,593)

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