Pensions - Components of Pension Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Interest cost	$ 14,017	$ 10,469	$ 13,949
Expected return on assets	(13,534)	(11,560)	(16,027)
Settlement (gain)/loss	(1,492)	(374)	819
Remeasurement (gain)/loss	(43,603)	(13,364)	43,495
Net periodic pension (benefit) cost	$ (44,612)	$ (14,829)	$ 42,236