Components Of Net Periodic Pension Benefit Cost (Income) (Details) - United Kingdom Subsidiary - UK Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 5,326	$ 6,401	$ 7,961
Expected return on plan assets	(12,726)	(12,023)	(12,165)
Amortization of unrecognized loss	3,642	2,389	2,342
Net periodic pension cost (income)	$ (3,758)	$ (3,233)	$ (1,862)