Pensions - Components of Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Interest cost	$ 3,418	$ 2,616
Expected return on assets	(3,488)	(2,890)
Settlement (gain)	0	(15)
Remeasurement (gain)	0	(164)
Net periodic pension (benefit)	$ (70)	$ (453)