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Employee benefit plans - Recognized Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent liabilities	$ (180,827)	$ (142,784)
Retirement Plans
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent assets	24,919	26,599
Current liabilities	(11,382)	(9,797)
Noncurrent liabilities	(174,987)	(134,555)
Net (liability)	(161,450)	(117,753)
Retiree Health and Life Insurance Plans
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent assets	0	0
Current liabilities	(817)	(1,801)
Noncurrent liabilities	(5,840)	(7,557)
Net (liability)	$ (6,657)	$ (9,358)

X

- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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