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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]          
Service cost - benefits earned during the year $ 2,545 $ 4,187 $ 5,090 $ 8,374  
Interest cost on the projected benefit obligation 8,781 7,693 17,562 15,386  
(Accretion) amortization of unrecognized prior service cost 0 1,098 0 2,195  
Amortization of unrecognized losses 2,235 878 4,470 1,757  
Net periodic benefits costs 13,561 $ 13,856 27,122 $ 27,712  
Employee benefits and other payments $ 8,438,000   $ 8,438,000   $ 7,818,000