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Accumulated other comprehensive loss - Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Gains and losses on cash flow hedges: |  |
Defined benefit plan adjustment | $ 1,391 | $ (32)
Foreign Currency Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | (72,987) | (75,052)
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | 0 | 0
Other comprehensive income/(loss) before reclassifications | (72,987) | (75,052)
Other comprehensive income/(loss), Before Tax Amount | (69,240) | (75,052)
Other comprehensive income/(loss), Tax (Expense) Benefit | 0 | 0
Other comprehensive (loss)/income | (69,240) | (75,052)
Foreign Currency Items | Net Income |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 3,747 | 0
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | 0 | 0
Amounts reclassified from accumulated other comprehensive income/(loss) | 3,747 | 0
Defined Benefit Pension Items |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | (3,365) | 63,559
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | (106) | (14,414)
Other comprehensive income/(loss) before reclassifications | (3,471) | 49,145
Other comprehensive income/(loss), Before Tax Amount | 3,629 | 630,924
Other comprehensive income/(loss), Tax (Expense) Benefit | (3,205) | (159,574)
Other comprehensive (loss)/income | 424 | 471,350
Defined Benefit Pension Items | Net Income |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 6,994 | 567,365
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | (3,099) | (145,160)
Amounts reclassified from accumulated other comprehensive income/(loss) | 3,895 | 422,205
Gains and Losses on Cash Flow Hedges |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss) before reclassifications, Before Tax Amount | 4,312 | 10,249
Other comprehensive income/(loss) before reclassifications, Tax (Expense) Benefit | (1,068) | (2,660)
Other comprehensive income/(loss) before reclassifications | 3,244 | 7,589
Other comprehensive income/(loss), Before Tax Amount | (2,439) | 1,498
Other comprehensive income/(loss), Tax (Expense) Benefit | 597 | (379)
Other comprehensive (loss)/income | (1,842) | 1,119
Gains and Losses on Cash Flow Hedges | Fixed assets |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | 805 | (289)
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | (298) | 77
Amounts reclassified from accumulated other comprehensive income/(loss) | 507 | (212)
Gains and Losses on Cash Flow Hedges | Net Income |  |
Gains and losses on cash flow hedges: |  |
Amounts reclassified from accumulated other comprehensive income/(loss), Before Tax Amount | (7,556) | (8,462)
Amounts reclassified from accumulated other comprehensive income/(loss), Tax (Expense) Benefit | 1,963 | 2,204
Amounts reclassified from accumulated other comprehensive income/(loss) | (5,593) | (6,258)
Accumulated Other Comprehensive Loss |  |
Gains and losses on cash flow hedges: |  |
Other comprehensive income/(loss), Before Tax Amount | (68,050) | 557,370
Other comprehensive income/(loss), Tax (Expense) Benefit | (2,608) | (159,953)
Other comprehensive (loss)/income | $ (70,658) | $ 397,417

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