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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]          
Service cost - benefits earned during the year $ 4,187 $ 3,666 $ 12,561 $ 11,000  
Interest cost on the projected benefit obligation 7,693 7,618 23,079 22,854  
(Accretion) amortization of unrecognized prior service cost 1,098 554 3,293 1,663  
Amortization of unrecognized losses 878 0 2,635 0  
Net periodic benefits costs 13,856 $ 11,838 41,568 $ 35,517  
Employee benefits and other payments $ 7,731,000   $ 7,731,000   $ 7,111,000