Reconciliation of Benefit Obligations and Plan Assets of U.K. Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Projected benefit obligation at beginning of year	$ 47,200	$ 40,456
Interest cost	554	736	$ 971
Actuarial (gains) losses (1)	(3,303)	5,410
Benefits paid	(2,679)	(1,111)
Prior service cost	36
Foreign currency exchange rate changes	(410)	1,709
Projected benefit obligation at end of year	41,398	47,200	40,456
Accumulated benefit obligation at end of year	41,398	47,200
Change in plan assets:
Fair value of plan assets at beginning of year	45,689	38,983
Actual return on plan assets	592	5,170
Employer contributions	1,055	988
Benefits paid	(2,679)	(1,111)
Foreign currency exchange rate changes	(470)	1,659
Fair value of plan assets at end of year	44,187	45,689	38,983
Funded status at end of year	2,789	(1,511)
Amounts included in accumulated other comprehensive loss not yet recognized in net periodic pension cost:
Net actuarial losses at beginning of year	(10,958)	(9,706)
Net actuarial gains (losses) during the year	2,775	(1,580)
Prior service cost arising during the year	(36)
Amounts reclassified from accumulated other comprehensive income to income before income taxes	959	715
Foreign currency exchange rate changes	54	(387)
Net actuarial losses	$ (7,206)	$ (10,958)	$ (9,706)