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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Retirement Benefits [Abstract]      
Liability for employee benefits and other payments $ 13,300   $ 12,500
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 0 $ 0  
Interest cost on the projected benefit obligation 7 8  
Amortization of unrecognized losses 0 0  
Net periodic benefits costs $ 7 $ 8