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Retirement Plans - Accumulated Benefit Obligations in Excess of Plan Asset (Details) - Pension Plan - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
United States
Defined Benefit Plan Disclosure
Projected benefit obligation	$ 7,875	$ 8,448	$ 7,809
Accumulated benefit obligation	7,875	8,448
Fair value of plan assets	4,767	4,459	4,360
United Kingdom
Defined Benefit Plan Disclosure
Projected benefit obligation	9,135	10,265	9,101
Accumulated benefit obligation	9,135	10,265
Fair value of plan assets	$ 8,409	$ 7,975	$ 7,290

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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