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Employee benefit plans - Recognized Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent liabilities	$ (158,265)	$ (171,518)
Retirement Plans
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent assets	70,221	26,814
Current liabilities	(10,375)	(150,310)
Noncurrent liabilities	(157,374)	(169,692)
Net liability	(97,528)	(293,188)
Retiree Health and Life Insurance Plans
Total Recognized Amounts in the Consolidated Balance Sheets
Noncurrent assets	1,758	553
Current liabilities	(1,055)	(849)
Noncurrent liabilities	(506)	(558)
Net liability	$ 197	$ (854)

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- 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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