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Retirement Benefits - Components Of Net Periodic Post Retirement Benefit Cost (Details) - Other Pension Plans, Defined Benefit - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0 $ 9
Interest cost 22 33 52
Amortization of prior service credits (20) (20) 0
Amortization of unrecognized loss 0 1 2
Net postretirement benefit cost included in compensation and employee benefits $ 2 $ 14 $ 63