Retirement Plans - Schedule of Plan Assets Fair Value Hierarchy (Details) - United Kingdom Subsidiary - UK Plan - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 356,532	$ 347,411	$ 307,001
Total plan assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		217,897	225,997
Total plan assets in fair value hierarchy | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		58,772	59,246
Total plan assets in fair value hierarchy | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		159,125	166,751
Total plan assets in fair value hierarchy | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Corporate debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		67,226	65,486
Corporate debt funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Corporate debt funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		67,226	65,486
Corporate debt funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Government bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		91,899	57,133
Government bond funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Government bond funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		91,899	57,133
Government bond funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			44,132
Equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			44,132
Equity funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		58,772	59,246
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		58,772	59,246
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	$ 111,971	$ 96,196
Fair value of plan assets by hierarchy and NAV [Extensible Enumeration]		Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	$ 26,664	$ 25,218
Fair value of plan assets by hierarchy and NAV [Extensible Enumeration]		Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]

[1] Certain investments measured using net asset value (“NAV”) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets.