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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Service cost - benefits earned during the year $ 0 $ 0 $ 0 $ 0  
Interest cost on the projected benefit obligation 8 9 24 28  
Amortization of unrecognized losses 0 2 0 6  
Net periodic benefits costs 8 $ 11 24 $ 34  
Employee benefits and other payments $ 10,900   $ 10,900   $ 9,500