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Pensions - Components of Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Retirement Benefits [Abstract]        
Interest cost $ 7,406 $ 3,418 $ 10,910 $ 6,836
Expected return on assets (3,778) (3,489) (7,161) (6,977)
Settlement (gain) (420) (390) (420) (390)
Remeasurement (gain) (1,343) (8,692) (1,343) (8,692)
Net periodic pension cost (benefit) $ 1,865 $ (9,153) $ 1,986 $ (9,223)