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Employee benefits - Accumulated benefit obligation in excess of plan assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 35,965	$ 628,175
Accumulated benefit obligation	36,965	628,175
Fair value of plan assets	29,193	619,885
OPEB Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	117,045	118,336
Accumulated benefit obligation	117,045	118,336
Fair value of plan assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
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