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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]          
Service cost - benefits earned during the year $ 2,545 $ 4,187 $ 7,635 $ 12,561  
Interest cost on the projected benefit obligation 8,781 7,693 26,343 23,079  
Amortization of unrecognized prior service cost 0 1,098 0 3,293  
Amortization of unrecognized losses 2,235 878 6,705 2,635  
Net periodic benefits costs 13,561 $ 13,856 40,683 $ 41,568  
Employee benefits and other payments $ 8,463,000   $ 8,463,000   $ 7,818,000