Retirement Plans - Schedule Of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
United States
Defined Benefit Plan Disclosure
Interest cost	$ 49	$ 43
Expected return on plan assets	(66)	(62)
Recognized net actuarial loss	18	25
Net periodic pension cost	1	6
United Kingdom
Defined Benefit Plan Disclosure
Interest cost	45	28
Expected return on plan assets	(81)	(65)
Amortization of prior service costs and transition amount	6	7
Recognized net actuarial loss	42	83
Net periodic pension cost	$ 12	$ 53