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Retirement Agreements And Other Postretirement Benefits (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 2,545 $ 4,187  
Interest cost on the projected benefit obligation 8,781 7,693  
(Accretion) amortization of unrecognized prior service cost 0 1,097  
Amortization of unrecognized losses 2,235 879  
Net periodic benefits costs 13,561 $ 13,856  
Employee benefits and other payments $ 8,391,000   $ 7,818,000