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Retirement Plans - Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligations $ 448,487 $ 494,273
Fair value of plans' assets 427,670 437,234
U.K Plan    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligations 281,828 267,200
Fair value of plans' assets $ 312,119 $ 303,957