Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Defined Benefit Plan, Plan with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Details)

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Employee Retirement Plans - Defined Benefit Plan, Plan with Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Details) - Defined Benefit Plan, Underfunded Plan - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated benefit obligation $ 9,211 $ 11,127
Plans with accumulated benefit obligation in excess of plan assets, plan assets 5,198 5,634
Projected benefit obligation 9,733 12,022
Plan with projected benefit obligation in excess of plan assets, plan assets $ 5,198 $ 5,634