Retirement Plans - Schedule of Changes in Benefit Obligations and Assets (Details) - United Kingdom Subsidiary - UK Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 383,142	$ 322,766
Interest cost	5,326	6,401	$ 7,961
Actuarial (gain) loss	(22,071)	50,863
Benefits paid	(13,939)	(10,029)
Foreign currency exchange rate changes	(3,311)	13,141
Benefit obligation at end of year	349,147	383,142	322,766
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	347,411	307,001
Actual return on plan assets	21,809	34,380
Employer contributions	4,956	4,665
Benefits paid	(13,939)	(10,029)
Foreign currency exchange rate changes	(3,705)	11,394
Fair value of plan assets at end of year	356,532	347,411	$ 307,001
Funded (unfunded) status at end of year	$ 7,385	$ (35,731)