Retirement Plans - Schedule Of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
United States
Defined Benefit Plan Disclosure
Interest cost	$ 49	$ 43	$ 97	$ 86
Expected return on plan assets	(66)	(62)	(132)	(124)
Recognized net actuarial loss	18	25	35	49
Net periodic pension cost	1	6	0	11
United Kingdom
Defined Benefit Plan Disclosure
Interest cost	43	28	86	56
Expected return on plan assets	(76)	(65)	(152)	(130)
Amortization of prior service costs and transition amount	6	7	12	14
Recognized net actuarial loss	40	83	80	166
Net periodic pension cost	$ 13	$ 53	$ 26	$ 106